阅读说明：本技术 声源载荷测试方法、系统、设备及介质 (Sound source load testing method, system, equipment and medium ) 是由 赵永吉 严竹芳 孙亚轩 于 2020-04-27 设计创作，主要内容包括：本发明公开了一种声源载荷测试方法、系统、设备及介质,所述方法包括：在待测试声源的台架测试中,获取待测试声源的第一测试点的第一声源数据；所述第一测试点是指与所述待测试声源表面具有预设距离的测试点；根据所述第一声源数据和预设表面声压模型,确定所述待测试声源的第二测试点在台架测试中的第二声源数据；所述第二测试点是指位于所述待测试声源表面的测试点；获取待测试声源在台架测试中的修正误差；根据所述修正误差以及所述第二声源数据,确定所述第二测试点的声源载荷。本发明能获取可以更准确地描述声源特性的声源载荷,测试结果更准确,简化了整体测试过程,降低了测试成本。(The invention discloses a sound source load testing method, a system, equipment and a medium, wherein the method comprises the following steps: in the bench test of a sound source to be tested, obtaining first sound source data of a first test point of the sound source to be tested; the first test point is a test point which has a preset distance with the surface of the sound source to be tested; determining second sound source data of a second test point of the sound source to be tested in the bench test according to the first sound source data and a preset surface sound pressure model; the second test point is a test point positioned on the surface of the sound source to be tested; acquiring a correction error of a sound source to be tested in a bench test; and determining the sound source load of the second test point according to the corrected error and the second sound source data. The invention can obtain the sound source load which can describe the sound source characteristics more accurately, the test result is more accurate, the whole test process is simplified, and the test cost is reduced.)

1. A method for testing the load of a sound source, comprising:

in the bench test of a sound source to be tested, obtaining first sound source data of a first test point of the sound source to be tested; the first test point is a test point which has a preset distance with the surface of the sound source to be tested;

determining second sound source data of a second test point of the sound source to be tested in the bench test according to the first sound source data and a preset surface sound pressure model; the second test point is a test point positioned on the surface of the sound source to be tested;

acquiring a correction error of a sound source to be tested in a bench test;

and determining the sound source load of the second test point according to the corrected error and the second sound source data.

2. The sound source load test method according to claim 1, wherein the acquiring of the first sound source data of the first test point of the sound source to be tested in the bench test of the sound source to be tested, comprises:

mounting the sound source to be tested on a test bench of a bench laboratory, and arranging sound source obtaining equipment at the first test point;

and enabling the sound source to be tested to vibrate at a preset vibration frequency, and storing a first sound pressure level corresponding to the preset vibration frequency and a first sound pressure level corresponding to the first sound pressure level as first sound source data after the first sound pressure level is obtained and measured by the sound source obtaining equipment.

3. The acoustic source loading test method of claim 2, wherein the determining second acoustic source data of the second test point of the acoustic source to be tested in the bench test based on the first acoustic source data and a preset surface acoustic pressure model comprises:

inputting the first sound pressure level in the first sound source data into the following preset surface sound pressure model:

wherein:a second voltage level for the second test point;a first sound pressure level at the first test point; m is the attenuation coefficient of sound intensity in air per meter; x is the number of₁Is the distance between a second test point and the surface of the sound source to be tested, and x₁＝0；x₂Is the distance between the first test point and the surface of the sound source to be tested, and x₂The preset distance is used as the preset distance; e is a natural constant;

and acquiring a second sound pressure level output by the preset surface sound pressure model, and storing the second sound pressure level and the preset vibration frequency corresponding to the second sound pressure level as second sound source data in an associated manner.

4. The method for testing the load of a sound source according to claim 3, wherein said obtaining the corrected error of the sound source to be tested in the bench test comprises:

mounting the sound source to be tested on a test bench of a bench laboratory, arranging a sound source testing device on the surface of the sound source to be tested, vibrating the sound source to be tested at a testing frequency, and acquiring a bench testing sound pressure level corresponding to the testing frequency and measured by the sound source testing device;

assembling a sound source to be tested in an integral test object, arranging a sound source test device on the surface of the sound source to be tested, enabling the sound source to be tested to drive the integral test object to vibrate together under test frequency, and acquiring an integral test sound pressure level which is measured by the sound source test device and corresponds to the test frequency;

and acquiring a difference value between the overall test sound pressure level and the bench test sound pressure level corresponding to the same test frequency, recording the difference value as a correction error, and storing the correction error and the test frequency corresponding to the correction error in a correlation manner.

5. The acoustic source loading test method of claim 4, wherein said determining the acoustic source loading for the second test point based on the corrected error and the second acoustic source data comprises:

matching the preset vibration frequency in the second sound source data with the test frequency corresponding to the correction error;

after the matching is successful, inputting the second sound pressure level of the second sound source data successfully matched and the correction error into the following preset correction model, and acquiring the sound source load of the second test point under the preset vibration frequency:

wherein:a second voltage level for the second test point; l is_PThe sound source load of the second test point;to correct for errors.

6. A sound source load testing system, comprising:

the system comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring first sound source data of a first test point of a sound source to be tested in bench testing of the sound source to be tested; the first test point is a test point which has a preset distance with the surface of the sound source to be tested;

the first determining module is used for determining second sound source data of a second test point of the sound source to be tested in the bench test according to the first sound source data and a preset surface sound pressure model; the second test point is a test point positioned on the surface of the sound source to be tested;

the second acquisition module is used for acquiring the correction error of the sound source to be tested in the bench test;

and the second determining module is used for determining the sound source load of the second test point according to the corrected error and the second sound source data.

7. The acoustic source loading test system of claim 6, wherein the first acquisition module comprises:

the layout unit is used for installing the sound source to be tested on a test bench of a bench laboratory and laying sound source acquisition equipment on the first test point;

the first sound source acquiring unit is used for enabling the sound source to be tested to vibrate at a preset vibration frequency, acquiring a first sound pressure level which is measured by the sound source acquiring equipment and corresponds to the preset vibration frequency, and storing the first sound pressure level and the preset vibration frequency corresponding to the first sound pressure level as first sound source data in an associated mode.

8. The acoustic source loading test system of claim 7, wherein the first determination module comprises:

an input unit configured to input the first sound pressure level in the first sound source data into the following preset surface sound pressure model:

wherein:a second voltage level for the second test point;a first sound pressure level at the first test point; m is the attenuation coefficient of sound intensity in air per meter; x is the number of₁Is the distance between a second test point and the surface of the sound source to be tested, and x₁＝0；x₂Is the distance between the first test point and the surface of the sound source to be tested, and x₂The preset distance is used as the preset distance; e is a natural constant;

and the second sound source acquisition unit is used for acquiring a second sound pressure level output by the preset surface sound pressure model and storing the second sound pressure level and the preset vibration frequency corresponding to the second sound pressure level into second sound source data in an associated mode.

9. A computer device comprising a memory, a processor, and computer readable instructions stored in the memory and executable on the processor, wherein the processor when executing the computer readable instructions implements the acoustic source load testing method of any of claims 1 to 5.

10. A computer readable storage medium storing computer readable instructions, wherein the computer readable instructions, when executed by a processor, implement the sound source load testing method according to any one of claims 1 to 5.

Technical Field

The invention relates to the field of sound source testing, in particular to a sound source load testing method, a sound source load testing system, sound source load testing equipment and a sound source load testing medium.

Background

Currently, when evaluating a sound source or acquiring a modeling simulation load, it is generally necessary to acquire the sound source characteristics of the sound source. In the prior art, when a sound source is evaluated, the mode of acquiring the sound source characteristic is generally to arrange microphones around the sound source for direct measurement, and the scheme has the defects that: special sound sources cannot be tested in their surroundings. When the modeling simulation load is obtained (for example, in the process of statistical energy analysis of the whole vehicle), the method for obtaining the sound source load mainly comprises the steps of arranging a certain number (at least 3 sound cavities) of microphones at the positions of the sound cavities around the main noise source according to the sound cavity dividing structure in the modeling process, and obtaining the corresponding sound source load by a direct measurement method (patch microphones are used on the surface of the sound cavities), wherein the method for obtaining the sound source load has the following defects: the number of the inner and outer sound cavities of the whole vehicle statistical energy model is large, at least 3 microphones are arranged on each sound cavity, the number of the arrangement points is large, the number of the required microphones is correspondingly increased, and therefore the testing difficulty and the testing cost are increased; in addition, when the main noise sources, such as the engine and the motor, are used to obtain the sound source load, a certain number of surface sensors are required to be arranged on the surface of the main noise sources for measurement, and for the whole vehicle test, it is very difficult to find a proper point distribution position, so that the accurate point distribution test cannot be performed in some directions.

Disclosure of Invention

The embodiment of the invention provides a sound source load testing method, a sound source load testing system, sound source load testing equipment and a sound source load testing medium, and solves the problems that in the prior art, a point distribution test cannot be carried out when the sound source characteristics of a sound source are obtained, and the test difficulty and the test cost are high.

A sound source load testing method, comprising:

in the bench test of a sound source to be tested, obtaining first sound source data of a first test point of the sound source to be tested; the first test point is a test point which has a preset distance with the surface of the sound source to be tested;

determining second sound source data of a second test point of the sound source to be tested in the bench test according to the first sound source data and a preset surface sound pressure model; the second test point is a test point positioned on the surface of the sound source to be tested;

acquiring a correction error of a sound source to be tested in a bench test;

and determining the sound source load of the second test point according to the corrected error and the second sound source data.

A sound source load testing system comprising:

the system comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring first sound source data of a first test point of a sound source to be tested in bench testing of the sound source to be tested; the first test point is a test point which has a preset distance with the surface of the sound source to be tested;

the first determining module is used for determining second sound source data of a second test point of the sound source to be tested in the bench test according to the first sound source data and a preset surface sound pressure model; the second test point is a test point positioned on the surface of the sound source to be tested;

the second acquisition module is used for acquiring the correction error of the sound source to be tested in the bench test;

and the second determining module is used for determining the sound source load of the second test point according to the corrected error and the second sound source data.

A computer device comprising a memory, a processor and computer readable instructions stored in the memory and executable on the processor, the processor implementing the acoustic source load testing method when executing the computer readable instructions.

A computer readable storage medium storing computer readable instructions which, when executed by a processor, implement the sound source load testing method described above.

According to the sound source load testing method, system, equipment and medium provided by the invention, in the rack test of the sound source to be tested, the first sound source data of the first test point of the sound source to be tested is obtained; the first test point is a test point which has a preset distance with the surface of the sound source to be tested; determining second sound source data of a second test point of the sound source to be tested in the bench test according to the first sound source data and a preset surface sound pressure model; the second test point is a test point positioned on the surface of the sound source to be tested; acquiring a correction error of a sound source to be tested in a bench test; and determining the sound source load of the second test point according to the corrected error and the second sound source data. The sound source load testing method can obtain the sound source load which can describe the characteristics of the sound source more accurately, and the testing result is more accurate; in addition, the invention does not need to arrange a great number of distribution points in the integral test (such as the whole vehicle test), simplifies the integral test process and reduces the test cost; for the distribution positions which are dangerous or can not be distributed, the required sound source load can be still and accurately obtained under the condition of canceling the distribution test of the distribution positions, and the test difficulty and the danger coefficient are further reduced; the sound source load testing method can calculate the sound source load which is separated from the sound source to be tested by any distance according to the requirement, and improves the applicability of the sound source load testing method.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive labor.

FIG. 1 is a flow chart of a method for testing the load of a sound source in accordance with an embodiment of the present invention;

FIG. 2 is a schematic block diagram of a sound source loading test system in an embodiment of the present invention;

FIG. 3 is a schematic diagram of a computer device in an embodiment of the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a sound source load testing method, as shown in figure 1, comprising the following steps:

s10, acquiring first sound source data of a first test point of a sound source to be tested in a bench test of the sound source to be tested; the first test point is a test point which has a preset distance with the surface of the sound source to be tested; the preset distance can be set according to requirements, and the sound source to be tested is preferably an engine, a motor and the like of a vehicle. In the present invention, the preset distance is preferably 1 meter. In the step, the sound source characteristic of a first test point with a preset distance away from the surface of a sound source to be tested can be accurately obtained in the bench test of an engine bench laboratory; that is, a first sound pressure level of a first test point (a test point having a predetermined distance from a surface of a sound source to be tested) of the sound source to be tested at a predetermined vibration frequency may be determined in the bench test, and the first sound pressure level and the predetermined vibration frequency corresponding to the first sound pressure level are first sound source data.

S20, determining second sound source data of a second test point of the sound source to be tested in the bench test according to the first sound source data and a preset surface sound pressure model; the second test point is a test point positioned on the surface of the sound source to be tested; understandably, according to the first sound source data and the preset surface sound pressure model, a second sound pressure level of a second test point (the test point positioned on the surface of the sound source to be tested) of the sound source to be tested at a preset vibration frequency can be determined, and the second sound pressure level and the preset vibration frequency corresponding to the second sound pressure level are second sound source data. The preset surface sound pressure model can be determined through the following attenuation equation, a sound intensity and sound pressure relation model and a sound pressure level conversion model.

First, the attenuation equation of sound intensity in air is:

wherein, I₂Is a first reference point (the first reference point is a distance x from the surface of the sound source to be tested)₁Test point of) the sound intensity; i is₁Is a second reference point (the second reference point is a distance x from the surface of the sound source to be tested)₂Test point of) the sound intensity; m is the attenuation coefficient of sound intensity in air per meter; x is the number of₁The distance between a second reference point and the surface of the sound source to be tested is taken as the distance; x is the number of₂The distance between a first reference point and the surface of the sound source to be tested is taken as the distance; e is a natural constant;

secondly, the relationship model of sound intensity and sound pressure comprises:

I₁＝P₁ ²/ρc

I₂＝P₂ ²/ρc

wherein ρ is the air density; c is the speed of sound in air; p₁A sound pressure to be measured which is a second reference point; p₂A sound pressure to be measured which is a first reference point;

third, the sound pressure level conversion model of sound pressure conversion into sound pressure level includes:

wherein: p₀Is a reference sound pressure. From the above, it can be determined that, according to the attenuation equation, the sound intensity and pressure relation model and the sound pressure level conversion model,

however, in the above equation, the unit of the attenuation coefficient m of the sound intensity in the air per meter needs to be converted into dB/m, so m needs to be multiplied by 4.343, and the preset surface sound pressure model for calculating the second sound pressure level of the second reference point of the sound source to be tested is finally obtained as follows:

wherein:a second sound pressure level being a second reference point;a first sound pressure level that is a first reference point; m is the attenuation coefficient (unit is dB/m) of sound intensity in air per meter; x is the number of₁Is the distance between a second reference point and the surface of the sound source to be tested, and in the invention, if the second reference point is a second test point, the x corresponding to the second test point is₁＝0；x₂Is the distance between a first reference point and the surface of the sound source to be tested, and in the invention, if the first reference point is a first test point, x corresponding to the first test point is₂The preset distance (such as 1 meter is preferred); e is a natural constant.

In summary, according to the preset surface sound pressure model, the second sound pressure level of the second test point can be determined according to the first sound pressure level of the first test point, and then the second sound source data can be obtained.

S30, acquiring a correction error of a sound source to be tested in a bench test; understandably, the correction error is a difference between an overall test sound pressure level (a sound source to be tested is mounted on an overall test object to be tested for an overall test, such as an overall vehicle test) and a bench test sound pressure level (a sound source to be tested is mounted on a test bench to be tested for a bench test) of the sound source to be tested at the same test frequency. That is, in fact, the sound source load that the invention finally needs to determine is the sound source load of the sound source to be tested assembled in the integral test object in the use process (corresponding to the integral test of the integral test object, such as the whole vehicle test), and the second sound pressure level (second sound source data) obtained in the step S20 is the sound source data obtained in the bench test, so there is a certain error between the two, at this time, because the main error between the two is that the sound source to be tested (such as the engine in the whole vehicle) in the integral test can drive other parts of the integral test object to vibrate and sound, besides the noise and vibration of the sound source itself, such as the vehicle body vibration and sound of the whole vehicle, and further influence the sound source characteristic of the sound source to be tested (engine); therefore, when determining the sound source load of the sound source to be tested in the whole test object, the error of the part needs to be corrected by correcting the error, wherein the error is corrected as follows:

wherein the content of the first and second substances,for integral testing of the sound pressure level, L, of the surface of a sound source to be tested in an integral test object of a mute laboratory_P′The sound pressure level of the bench test of the surface of the sound source to be tested is measured when the same sound source to be tested is subjected to the bench test on the test bench;to correct for errors. Understandably, the correction error calculated in the correction error formula, the overall test sound pressure level and the bench test sound pressure level all correspond to the same test frequency of the sound source to be tested.

In this step, the correction error is not physically corrected for the test process (physical correction refers to error correction of the test position, accuracy correction of reading selection, etc., physical correction is usually performed by data averaging of multiple measurements and accuracy improvement means of measurement means, etc.). On the basis of accurate data measurement (i.e. in a state that no physical correction is needed or the physical correction is already performed or is performed after a delay), when a single sound source to be tested is embedded into a system (such as a whole test object), the system affects the sound field around the sound source to be tested (the principle of sound wave phase superposition), and the step corrects the error. The correction method of the step is simplified, when the integral test object embedded with the sound source to be tested (such as an engine, namely a noise source) is regarded as an integral constraint, the sound source to be tested is tested on the test bench to measure the second surface sound pressure level L of the surface of the sound source to be tested when the sound source to be tested is tested on the test bench_P′I.e. the standard sound pressure level of the sound source to be tested, which affects the surrounding sound field in the whole test object (i.e. generates the surrounding noise), at this time, the first surface sound pressure level of the sound source surface to be tested in the whole test object of the whole test mute laboratory is obtainedI.e. the sound pressure level obtained by the sound source to be tested in the whole test object with ambient noise, thenAnd L_P′The difference between the two can be used as the correction error of the sound source to be tested, and understandably, the correction error is only related to the whole test object system and is not related to other values.

And S40, determining the sound source load of the second test point according to the corrected error and the second sound source data. That is, according to the corrected error, the error of the second pressure level in the second sound source data can be determined and corrected, and then the sound source load finally required by the second test point can be accurately determined.

The sound source load testing method fully considers the attenuation effect of sound waves in a medium and also considers the influence effect of the overall test object on the sound source to be tested when the sound source to be tested is coupled in the overall test object. Through calculation and correction, the sound source load capable of describing the sound source characteristics more accurately can be obtained, and the test result is more accurate; in addition, the invention does not need to arrange a great number of points in the integral test, simplifies the integral test process and reduces the test cost; for the distribution positions which are dangerous or can not be distributed, the required sound source load can be still and accurately obtained under the condition of canceling the distribution test of the distribution positions, and the test difficulty and the danger coefficient are further reduced; the sound source load testing method can calculate the sound source load which is separated from the sound source to be tested by any distance according to the requirement, and improves the applicability of the sound source load testing method.

In an embodiment, the step S10, namely, the acquiring first sound source data of a first test point of a sound source to be tested in the bench test of the sound source to be tested, includes:

mounting the sound source to be tested on a test bench of a bench laboratory, and arranging sound source obtaining equipment at the first test point;

and enabling the sound source to be tested to vibrate at a preset vibration frequency, and storing a first sound pressure level corresponding to the preset vibration frequency and a first sound pressure level corresponding to the first sound pressure level as first sound source data after the first sound pressure level is obtained and measured by the sound source obtaining equipment. The sound source obtaining device is a microphone which is installed at a first test point and can directly measure a first sound pressure level of the first test point, and after the sound source obtaining device measures the first sound pressure level corresponding to different preset vibration frequencies, the different first sound pressure levels and the preset vibration frequencies corresponding to the first sound pressure levels are stored in a database in a correlated mode to form first sound source data, so that the first sound source data can be called from the database at any time when needing to be used.

In one embodiment, in a bench laboratory, an engine is installed on a test bench of the bench laboratory as a sound source to be tested, first test points are arranged at a distance of 1 meter from the top surface of the engine according to a test standard, and bench testing is performed, wherein the first test points of each arrangement are tested for a first sound pressure level result as shown in the following table 1:

TABLE 1 first sound pressure level of Engine bench test

Wherein the frequencies in Table 1 are the different predetermined vibration frequencies, and the sound pressure levels in Table 1I.e. the first sound pressure level. The first sound pressure level and the corresponding predetermined vibration frequency in table 1 are the engineFirst sound source data of the machine. As shown in table 1, the first sound source data may include a plurality of first sound pressure levels, and each of the first sound pressure levels corresponds to a preset vibration frequency.

In an embodiment, the step S20, namely determining second sound source data of the second test point of the sound source to be tested in the bench test according to the first sound source data and the preset surface sound pressure model, includes:

inputting the first sound pressure level in the first sound source data into the following preset surface sound pressure model:

wherein:a second voltage level for the second test point;a first sound pressure level at the first test point; m is the attenuation coefficient of sound intensity in air per meter; x is the number of₁Is the distance between a second test point and the surface of the sound source to be tested, and x₁＝0；x₂Is the distance between the first test point and the surface of the sound source to be tested, and x₂The preset distance is used as the preset distance; e is a natural constant;

and acquiring a second sound pressure level output by the preset surface sound pressure model, and storing the second sound pressure level and the preset vibration frequency corresponding to the second sound pressure level as second sound source data in an associated manner.

In a specific example of the above embodiment, in the formulaAs shown in Table 1 above, and x₁-x₂The-1 m is shown in table 2 below by consulting the acoustic handbook:

TABLE 2 attenuation coefficient m (unit dB/m) of sound intensity in air at normal temperature per meter

Wherein, the frequencies in table 2 are different preset vibration frequencies, and m is the attenuation coefficient per meter of sound intensity in air corresponding to the different preset vibration frequencies.

Further, according to the preset surface sound pressure model:a second pressure level of the engine top surface can be calculatedAs in table 3 below:

TABLE 3 Engine Top surface Sound pressure level

Wherein the frequencies in Table 3 are the different predetermined vibration frequencies, and the sound pressure levels in Table 3I.e. the second sound pressure level. The second sound pressure level and the corresponding predetermined vibration frequency in table 3 are the second sound source data of the engine. As shown in table 3, the second sound source data may include a plurality of second sound pressure levels, and each of the second sound pressure levels corresponds to a preset vibration frequency.

In an embodiment, the step S30, namely, the acquiring a corrected error of the sound source to be tested in the bench test, includes:

mounting the sound source to be tested on a test bench of a bench laboratory, arranging a sound source testing device on the surface of the sound source to be tested, vibrating the sound source to be tested at a testing frequency, and acquiring a bench testing sound pressure level corresponding to the testing frequency and measured by the sound source testing device; the sound source testing device is a microphone which is arranged on the surface of a sound source to be tested and can directly test the bench test sound pressure level of the surface of the sound source to be tested, and after the sound source testing device tests the bench test sound pressure levels corresponding to different preset vibration frequencies, the different bench test sound pressure levels and the test frequencies corresponding to the bench test sound pressure levels are stored in a database in an associated mode so as to be convenient for being called from the database at any time when the sound source testing device is required to be used.

Assembling a sound source to be tested in an integral test object, arranging a sound source test device on the surface of the sound source to be tested, enabling the sound source to be tested to drive the integral test object to vibrate together under test frequency, and acquiring an integral test sound pressure level which is measured by the sound source test device and corresponds to the test frequency; the sound source testing device (such as a microphone) is installed on the surface of a sound source to be tested and can directly measure the overall testing sound pressure level of the surface of the sound source to be tested, and after the sound source testing device measures the overall testing sound pressure levels corresponding to different preset vibration frequencies, the different overall testing sound pressure levels and the testing frequencies corresponding to the overall testing sound pressure levels are stored in the database in an associated mode, so that the sound source testing device can be called from the database at any time when in use.

And acquiring a difference value between the overall test sound pressure level and the bench test sound pressure level corresponding to the same test frequency, recording the difference value as a correction error, and storing the correction error and the test frequency corresponding to the correction error in a correlation manner.

Assembling the engine as the sound source to be tested in the embodiment of the previous embodiment on the whole test object, and performing the whole test to obtain the sound pressure level result of the engine surface (the whole test sound pressure level corresponding to the test frequency) and the sound pressure level result of the engine of the same type in the bench test (the bench test sound pressure level corresponding to the test frequency), using the following error correction formula:the calculated correction errors are shown in table 4 below, in which,for integral testing of the sound pressure level, L, of the surface of a sound source to be tested in an integral test object of a mute laboratory_P′The sound pressure level of the bench test of the surface of the sound source to be tested is measured when the same sound source to be tested is subjected to the bench test on the test bench;to correct for errors. Understandably, the correction error calculated in the correction error formula, the overall test sound pressure level and the bench test sound pressure level all correspond to the same test frequency of the sound source to be tested.

TABLE 4 correction of errors

Wherein the frequencies in Table 4 are different test frequencies, and the correction errors in Table 4I.e. the calculated correction errors, as can be seen from table 4, each correction error is associated with a test frequency.

In an embodiment, the step S40, namely, the determining the sound source load of the second test point according to the corrected error and the second sound source data, includes:

matching the preset vibration frequency in the second sound source data with the test frequency corresponding to the correction error;

after the matching is successful, inputting the second sound pressure level of the second sound source data successfully matched and the correction error into the following preset correction model, and acquiring the sound source load of the second test point under the preset vibration frequency:

wherein:a second voltage level for the second test point; l is_PThe sound source load of the second test point;to correct for errors.

Taking the engine in the specific example in the previous embodiment as the sound source to be tested, calculating the final required sound source load sound pressure level according to the preset correction model as shown in the following table 5:

TABLE 5 Final required Sound Source load L_P

frequency/Hz	400	500	630	800	1000	1250	1600	2000	2500	3150	4000	5000	6300	8000
															LP/dB(A)	79.47	88.12	86.74	87.75	85.37	90.39	92.05	84.33	90.25	88.74	75.18	77.23	78.53	73.55

Wherein the frequencies in table 5 are different preset vibration frequencies, L in table 5_PThat is, the sound pressure level of the sound source load obtained by the final calculation is obtained, and it can be known from table 5 that each sound source load L_PAre associated with a predetermined vibration frequency. That is, based on the corrected error, the error of the second pressure level in the second sound source data can be determined and performedCorrecting, and further accurately determining the sound source load sound pressure level finally required by the second test point; furthermore, when the attenuation effect of sound waves in a medium is fully considered and the coupling of a sound source to be tested in an integral test object is also considered, on the basis of the influence effect of the integral test object on the sound source to be tested, the sound source load capable of describing the characteristics of the sound source more accurately is obtained through calculation and correction, so that the test result is more accurate.

In one embodiment, as shown in fig. 2, a sound source load testing system is provided, which corresponds to the sound source load testing method in the above embodiment one to one. The sound source load test system includes:

the first acquisition module 11 is configured to acquire first sound source data of a first test point of a sound source to be tested in a bench test of the sound source to be tested; the first test point is a test point which has a preset distance with the surface of the sound source to be tested;

the first determining module 12 is configured to determine second sound source data of a second test point of the sound source to be tested in the bench test according to the first sound source data and a preset surface sound pressure model; the second test point is a test point positioned on the surface of the sound source to be tested;

the second obtaining module 13 is configured to obtain a correction error of a sound source to be tested in a bench test;

a second determining module 14, configured to determine the sound source load of the second test point according to the corrected error and the second sound source data.

In an embodiment, the first obtaining module 11 includes:

the layout unit is used for installing the sound source to be tested on a test bench of a bench laboratory and laying sound source acquisition equipment on the first test point;

the first sound source acquiring unit is used for enabling the sound source to be tested to vibrate at a preset vibration frequency, acquiring a first sound pressure level which is measured by the sound source acquiring equipment and corresponds to the preset vibration frequency, and storing the first sound pressure level and the preset vibration frequency corresponding to the first sound pressure level as first sound source data in an associated mode.

In one embodiment, the first determining module 12 includes:

an input unit configured to input the first sound pressure level in the first sound source data into the following preset surface sound pressure model:

wherein:a second voltage level for the second test point;a first sound pressure level at the first test point; m is the attenuation coefficient of sound intensity in air per meter; x is the number of₁Is the distance between a second test point and the surface of the sound source to be tested, and x₁＝0；x₂Is the distance between the first test point and the surface of the sound source to be tested, and x₂The preset distance is used as the preset distance; e is a natural constant;

and the second sound source acquisition unit is used for acquiring a second sound pressure level output by the preset surface sound pressure model and storing the second sound pressure level and the preset vibration frequency corresponding to the second sound pressure level into second sound source data in an associated mode.

In an embodiment, the second obtaining module 13 includes:

the test bench comprises a bench test unit, a sound source testing device and a sound source testing unit, wherein the bench test unit is used for mounting the sound source to be tested on a test bench of a bench laboratory, arranging the sound source testing device on the surface of the sound source to be tested, enabling the sound source to be tested to vibrate under a test frequency, and acquiring a bench test sound pressure level corresponding to the test frequency and measured by the sound source testing device;

the integral testing unit is used for assembling a sound source to be tested in an integral testing object, arranging a sound source testing device on the surface of the sound source to be tested, enabling the sound source to be tested to drive the integral testing object to vibrate together under a testing frequency, and acquiring an integral testing sound pressure level which is measured by the sound source testing device and corresponds to the testing frequency;

and the error acquisition unit is used for acquiring the difference between the overall test sound pressure level and the bench test sound pressure level corresponding to the same test frequency, recording the difference as a correction error, and then storing the correction error and the test frequency corresponding to the correction error in a correlation mode.

In one embodiment, the second determining module 14 includes:

the matching unit is used for matching the preset vibration frequency in the second sound source data with the test frequency corresponding to the correction error;

and the sound source load obtaining unit is used for inputting the second sound pressure level of the second sound source data successfully matched and the correction error into the following preset correction model after the matching is successful, and obtaining the sound source load of the second test point under the preset vibration frequency:

wherein:a second voltage level for the second test point; l is_PThe sound source load of the second test point;to correct for errors.

For specific definition of the sound source load test system, reference may be made to the above definition of the sound source load test method, which is not described herein again. The various modules in the acoustic source load testing system described above may be implemented in whole or in part by software, hardware, and combinations thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.

In one embodiment, a computer device is provided, which may be a server, the internal structure of which may be as shown in fig. 3. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer readable instructions, and a database. The internal memory provides an environment for the operating system and execution of computer-readable instructions in the non-volatile storage medium. The computer readable instructions, when executed by a processor, implement a method for acoustic source loading testing.

In one embodiment, a computer device is provided comprising a memory, a processor, and computer readable instructions stored on the memory and executable on the processor, the processor implementing the acoustic source load testing method when executing the computer readable instructions.

In one embodiment, a computer readable storage medium is provided having computer readable instructions stored thereon which, when executed by a processor, implement the acoustic source load testing method described above.

It will be understood by those of ordinary skill in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware associated with computer readable instructions, which can be stored in a non-volatile computer readable storage medium, and when executed, can include processes of the embodiments of the methods described above. Any reference to memory, storage, databases, or other media used in embodiments provided herein may include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), Direct Rambus Dynamic RAM (DRDRAM), and Rambus Dynamic RAM (RDRAM).

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of each functional unit or module is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units or modules according to needs, that is, the internal structure of the system is divided into different functional units or modules to perform all or part of the above-mentioned functions.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.