阅读说明：本技术 一种车内空腔模态测试装置及测试方法 (In-vehicle cavity modal testing device and testing method ) 是由 齐伸翼 孙延伟 李广府 纪金亮 张翀翊 马君 郭彦斐 赵亚 李有哲 郭孟鸽 孔剑 于 2021-08-24 设计创作，主要内容包括：本发明公开了一种车内空腔模态测试装置及测试方法,车内空腔模态测试装置包括伸缩块、短间接块、长间接块、测试块、安装钩、麦克风、高度测试器和无线控制器,根据车内测试空间宽度选用合适数量测试块、短间接块以及长间接块,他们之间连接形成测试组,然后在测试组的首位两端分别吸附两块伸缩块。本发明由于能够灵活调整测试组的长度及测试点的数量,满足车内复杂空间的测试需求；本发明通过遥控控制装置高度,避免的反复开车门进行调整的过程,节省了大量试验时间；本发明通过高度仪测试,避免了人为测试的不准确性。(The invention discloses an in-vehicle cavity modal testing device and a testing method, wherein the in-vehicle cavity modal testing device comprises telescopic blocks, short indirect blocks, long indirect blocks, testing blocks, mounting hooks, microphones, a height tester and a wireless controller, the testing blocks, the short indirect blocks and the long indirect blocks are selected in proper quantity according to the width of in-vehicle testing space, a testing group is formed by connecting the testing blocks, the short indirect blocks and the long indirect blocks, and then two telescopic blocks are respectively adsorbed at the first two ends of the testing group. The length of the test group and the number of the test points can be flexibly adjusted, so that the test requirement of complex space in the vehicle is met; the height of the remote control device is controlled, so that the process of repeatedly driving the car door to adjust is avoided, and a large amount of test time is saved; the invention avoids the inaccuracy of artificial test through the test of the height gauge.)

1. The utility model provides a cavity modal testing arrangement in car which characterized in that: the device comprises a telescopic block, a short indirect block, a long indirect block, a test block, an installation hook, a microphone, a height tester and a wireless controller, wherein the test block, the short indirect block and the long indirect block are selected in proper quantity according to the width of a test space in a vehicle, are connected to form a test group, and then are respectively adsorbed at the first two ends of the test group;

wherein:

the telescopic block comprises a telescopic block body, a battery, a controller, a wireless receiver, a motor, a negative pole adsorption magnet, a positive pole adsorption magnet, a guy cable and a hook, the negative pole adsorption magnet and the positive pole adsorption magnet are respectively arranged on the left side and the right side of the telescopic block body, a hoisting shaft is installed in the telescopic block body and is driven by the motor, one end of the guy cable is wound on the hoisting shaft, the other end of the guy cable extends out of the telescopic block body and is connected with the hook, the wireless receiver receives a signal of the wireless controller and controls the motor to rotate through the controller, so that the guy cable is contracted or loosened;

the short indirect block comprises a short indirect block body, a negative pole adsorption magnet, a height tester installation groove and a positive pole adsorption magnet, and the short indirect block and the long indirect block are matched for adjusting the length of the whole device; the left side and the right side of the short indirect block body are respectively provided with a negative pole adsorption magnet and a positive pole adsorption magnet, the back of the short indirect block body is provided with a height tester mounting groove, and the height tester mounting groove is used for mounting a height tester;

the long indirect block comprises a long indirect block body, a negative pole adsorption magnet, a height tester mounting groove and a positive pole adsorption magnet, and the long indirect block and the short indirect block are matched for adjusting the length of the whole device; the left side and the right side of the long indirect block body are respectively provided with a negative pole adsorption magnet and a positive pole adsorption magnet, the back of the long indirect block body is provided with a height tester mounting groove, and the height tester mounting groove is used for mounting a height tester;

the testing block comprises a testing block body, a negative adsorption magnet, a microphone mounting hole and a positive adsorption magnet, wherein the negative adsorption magnet and the positive adsorption magnet are respectively mounted on the left side and the right side of the testing block body;

the mounting hook comprises a hanging ring and a connecting disc, the connecting disc is used for being adsorbed on the surface of the vehicle window glass or the ceiling glass or being adhered to the position of the interior trim of the vehicle roof through an adhesive tape, and the hanging ring is used for being combined with the hanging hook.

2. An in-vehicle cavity modal testing device according to claim 1, wherein: the height tester comprises a shell, and a wireless transmitter, a battery and a distance sensor which are arranged in the shell, wherein the distance sensor is used for monitoring the ground clearance of the device in the vehicle, and the wireless transmitter is used for transmitting height information to the wireless controller; the shell is externally provided with a clamping groove which is matched and connected with the height tester mounting groove.

3. An in-vehicle cavity modal testing device according to claim 1, wherein: the length of the long indirect block body is larger than that of the short indirect block body.

4. An in-vehicle cavity modal testing device according to claim 1, wherein: the microphone mounting hole is internally provided with a rubber film.

5. An in-vehicle cavity modal testing device according to claim 1, wherein: the connecting disc is of a sucker structure.

6. An in-vehicle cavity mode testing method using the in-vehicle cavity mode testing device according to any one of claims 1 to 5, characterized by comprising the steps of:

(1) selecting a proper number of test blocks, short indirect blocks and long indirect blocks according to the width of a test space in the vehicle, connecting the test blocks, the short indirect blocks and the long indirect blocks through adsorption magnets between the test blocks to form a test group, and adsorbing two telescopic blocks at the first two ends of the test group respectively;

(2) adsorbing a connecting disc of the mounting hook on the surfaces of car window glass, ceiling glass and the like or adhering the connecting disc to the interior trim of the car roof through an adhesive tape, then pulling out a guy cable in the telescopic block, and hanging the hook on a hanging ring of the mounting hook;

(3) the height tester is clamped into a height tester mounting groove at the back of the short indirect block or the long indirect block through the clamping groove, so that the distance sensor of the height tester can test appropriate height data, and a microphone is placed into a microphone mounting hole of the test block;

(4) the controller adjusts a motor in the telescopic block to contract or loosen the inhaul cable so as to control the test group to be at a proper control height, then the volume sound source is opened to perform a group of tests, and then the inhaul cable is contracted or loosened to prepare for the next group of tests;

(5) and (5) moving the adsorption or installation position of the installation hook according to the steps (1) to (4) to gradually complete the in-vehicle sound cavity modal test.

Technical Field

The invention relates to the technical field of automobile processing and manufacturing, in particular to a device and a method for testing a cavity mode in an automobile.

Background

Along with the improvement of life quality of people, the requirement of people on the NVH attribute of an automobile is higher and higher at present, the NVH attribute becomes one of important indexes in the automobile development process, and noise in the automobile is an important factor influencing the NVH attribute. In order to reduce and control noise in the vehicle, the acoustic characteristics of the cavity in the vehicle must be studied. By measuring the acoustic mode of the cavity of the automobile, the acoustic mode frequency and the mode vibration mode of the cavity in the automobile are obtained, the sound pressure distribution in the automobile can be known, on one hand, the design of the automobile body can be guided, and the vibration frequency of the reinforcing beam or the metal plate is staggered with the cavity mode by a certain frequency, so that the coupling effect is reduced and the generation of the sound booming is avoided; on the other hand, the acoustic cavity finite element model is established, and the vibration mode and the frequency of the tested acoustic mode of the cavity are corrected, so that the accuracy of the finite element prediction of the acoustic booming in the vehicle is improved, and the method has great significance for the forward development of the vehicle. Although the industry mostly adopts low frequency volume sound source and microphone to test the sound cavity mode at present, there is not a corresponding high-efficient device yet at present to need fixed microphone of repeated removal or support in the testing process, the process is loaded down with trivial details, and the wasted time has greatly influenced efficiency of software testing and wasted cost of labor.

Fig. 1 and 2 show two examples of a conventional in-vehicle acoustic cavity modal testing apparatus. The existing mode of testing the acoustic cavity in the car is to arrange sensors in a row, fix the sensors on a movable frame, place the sensors and a volume sound source in the car, start the volume sound source to emit sound waves after the test begins, move the height and the front and back positions of the frame for multiple times according to a certain height, left and right intervals, measure the sound pressure of different positions in the frame, and finally obtain the acoustic modal frequency and the modal vibration mode of the cavity in the car through analysis of test data.

The existing acoustic cavity modal testing device has the following defects: the smaller the interval between the two testing positions is, the more accurate the obtained acoustic modal frequency and modal vibration mode is, so that the car door needs to be opened for multiple times to repeatedly move the fixed bracket in the testing process and then the sound pressure is measured, the process is complicated, the time is wasted, the testing efficiency is greatly influenced, and the labor cost is greatly wasted; secondly, the space in the vehicle is relatively complex (such as the front end of a driver seat and the like), and the length of a microphone fixing support and the microphone fixing position are difficult to adjust in the test process, so that the test efficiency is also influenced and the labor cost is wasted in the process, and meanwhile, part of the area of the existing device cannot meet the test condition; the height change of the test is measured by a measuring tape by a tester, the reading information is complex, and the position information is not accurate enough.

Disclosure of Invention

The invention aims to provide a device and a method for testing a cavity mode in a vehicle.

In order to solve the technical problems, the invention adopts the following technical scheme:

a vehicle cavity modal testing device comprises a telescopic block, a short indirect block, a long indirect block, a testing block, a mounting hook, a microphone, a height tester and a wireless controller, wherein a proper number of testing blocks, short indirect blocks and long indirect blocks are selected according to the width of a vehicle testing space, are connected to form a testing group, and then two telescopic blocks are respectively adsorbed at the first two ends of the testing group;

wherein:

the telescopic block comprises a telescopic block body, a battery, a controller, a wireless receiver, a motor, a negative pole adsorption magnet, a positive pole adsorption magnet, a guy cable and a hook, the negative pole adsorption magnet and the positive pole adsorption magnet are respectively arranged on the left side and the right side of the telescopic block body, a hoisting shaft is installed in the telescopic block body and is driven by the motor, one end of the guy cable is wound on the hoisting shaft, the other end of the guy cable extends out of the telescopic block body and is connected with the hook, the wireless receiver receives a signal of the wireless controller and controls the motor to rotate through the controller, so that the guy cable is contracted or loosened;

the short indirect block comprises a short indirect block body, a negative pole adsorption magnet, a height tester installation groove and a positive pole adsorption magnet, and the short indirect block and the long indirect block are matched for adjusting the length of the whole device; the left side and the right side of the short indirect block body are respectively provided with a negative pole adsorption magnet and a positive pole adsorption magnet, the back of the short indirect block body is provided with a height tester mounting groove, and the height tester mounting groove is used for mounting a height tester;

the long indirect block comprises a long indirect block body, a negative pole adsorption magnet, a height tester mounting groove and a positive pole adsorption magnet, and the long indirect block and the short indirect block are matched for adjusting the length of the whole device; the left side and the right side of the long indirect block body are respectively provided with a negative pole adsorption magnet and a positive pole adsorption magnet, the back of the long indirect block body is provided with a height tester mounting groove, and the height tester mounting groove is used for mounting a height tester;

the testing block comprises a testing block body, a negative adsorption magnet, a microphone mounting hole and a positive adsorption magnet, wherein the negative adsorption magnet and the positive adsorption magnet are respectively mounted on the left side and the right side of the testing block body;

the mounting hook comprises a hanging ring and a connecting disc, the connecting disc is used for being adsorbed on the surface of the vehicle window glass or the ceiling glass or being adhered to the position of the interior trim of the vehicle roof through an adhesive tape, and the hanging ring is used for being combined with the hanging hook.

Preferably, the height tester comprises a shell, and a wireless transmitter, a battery and a distance sensor which are arranged in the shell, wherein the distance sensor is used for monitoring the ground clearance in the device vehicle, and the wireless transmitter is used for transmitting the height information to the wireless controller; the shell is externally provided with a clamping groove which is matched and connected with the height tester mounting groove.

Preferably, the length of the long indirect block body is greater than that of the short indirect block body.

Preferably, the microphone mounting hole contains a rubber membrane.

Preferably, the connecting disc is of a sucker structure.

The invention also discloses a method for testing the mode of the cavity in the vehicle, which uses the device for testing the mode of the cavity in the vehicle and comprises the following steps:

(1) selecting a proper number of test blocks, short indirect blocks and long indirect blocks according to the width of a test space in the vehicle, connecting the test blocks, the short indirect blocks and the long indirect blocks through adsorption magnets between the test blocks to form a test group, and adsorbing two telescopic blocks at the first two ends of the test group respectively;

(2) adsorbing a connecting disc of the mounting hook on the surfaces of car window glass, ceiling glass and the like or adhering the connecting disc to the interior trim of the car roof through an adhesive tape, then pulling out a guy cable in the telescopic block, and hanging the hook on a hanging ring of the mounting hook;

(3) the height tester is clamped into a height tester mounting groove at the back of the short indirect block or the long indirect block through the clamping groove, so that the distance sensor of the height tester can test appropriate height data, and a microphone is placed into a microphone mounting hole of the test block;

(4) the controller adjusts a motor in the telescopic block to contract or loosen the inhaul cable so as to control the test group to be at a proper control height, then the volume sound source is opened to perform a group of tests, and then the inhaul cable is contracted or loosened to prepare for the next group of tests;

(5) and (5) moving the adsorption or installation position of the installation hook according to the steps (1) to (4) to gradually complete the in-vehicle sound cavity modal test.

The invention has the beneficial effects that:

the invention can meet the requirements of the in-vehicle cavity modal test: (1) the length of the testing device can be adjusted by adjusting the number of the short indirect blocks and the long indirect blocks so as to meet the testing requirement of complex space in the vehicle; (2) the mounting hook can be adsorbed at a car window or a roof in a car and then fixed through an adhesive tape, and a guy cable of the telescopic block is attached to the mounting hook through the hook, so that the telescopic block is controlled to contract or the length of the guy cable is relaxed, and the height of the testing device can be adjusted; (3) the requirements of different testing densities can be met by adjusting the number of the testing blocks; (4) the short indirect block and the long indirect block can be provided with a height tester at the back, and can be radiated to the controller through a wireless device and can be read through the display screen of the controller.

The invention has the following beneficial effects: (1) the device can flexibly adjust the length of the test group and the number of the test points, thereby meeting the test requirement of complex space in the vehicle; (2) the device avoids the process of repeatedly driving the car door to adjust by remotely controlling the height of the device, thereby saving a large amount of test time; (3) the device is tested by the height gauge, so that the inaccuracy of manual (tape measure) testing is avoided.

Drawings

FIG. 1 is a first example of a prior art in-vehicle acoustic cavity modal testing apparatus;

FIG. 2 is a second example of a conventional in-vehicle acoustic cavity modal testing apparatus;

FIG. 3 is a schematic front view of the modal testing apparatus for a cavity in a vehicle according to the present invention;

FIG. 4 is a schematic diagram of the rear side of the apparatus for testing the modal shape of the cavity in the vehicle according to the present invention;

FIG. 5 is a schematic structural view of a telescopic block according to the present invention;

FIG. 6 is an enlarged schematic view of the interior of FIG. 5 at A;

FIG. 7 is a first schematic diagram of the structure of the short indirect block of the present invention;

FIG. 8 is a second schematic diagram of the structure of the short indirect block of the present invention;

FIG. 9 is a first schematic diagram of the structure of the long indirect block of the present invention;

FIG. 10 is a second schematic structural view of a long indirect block of the present invention;

FIG. 11 is a first schematic diagram of the structure of a test block according to the present invention;

FIG. 12 is a second schematic diagram of the structure of the test block of the present invention;

FIG. 13 is a schematic view of the structure of a microphone according to the present invention;

FIG. 14 is a schematic view of the construction of the mounting hook of the present invention;

FIG. 15 is a schematic view of a height tester according to the present invention;

FIG. 16 is an internal schematic view of the height tester of the present invention;

fig. 17 is a schematic structural diagram of a controller according to the present invention.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings.

As shown in fig. 3 to 17, the technical problem mainly solved by the apparatus for testing a cavity mode in a vehicle according to the present embodiment is: (1) the test process of the vehicle volume cavity mode is complicated and needs cooperation of multiple persons, so that the test labor and the test time are wasted; (2) in the test process, the position information of the two times of sound intensity measurement is not accurate enough because the tester measures through the tape measure; (3) the space in the vehicle is relatively complex, and partial areas of the existing device can not meet the test conditions.

The present embodiment relates to the interpretation of terms: a distance sensor: the distance sensor is a sensor for measuring the distance of an obstacle by using the infrared reflection principle; noise sensor (microphone): the noise sensor is a sensor which is internally provided with a sound-sensitive electret condenser microphone, and the sound waves enable an electret film in the microphone to vibrate to cause the change of capacitance, thereby realizing the conversion from optical signals to electric signals.

The utility model provides a cavity modal testing arrangement in car, includes mainly by flexible piece 1, short indirect piece 2, long indirect piece 3, test piece 4, installation hook 5, microphone 6, height tester 7 and wireless controller 35, chooses suitable quantity test piece 4, short indirect piece 2 and long indirect piece 3 for use according to the test space width in the car, connects between them and forms the test group, then adsorbs two flexible pieces 1 respectively at the first both ends of test group.

Wherein:

the telescopic block 1 comprises a telescopic block body, a battery 8, a controller 9, a wireless receiver 10, a motor 11, a cathode adsorption magnet 12, a positive adsorption magnet 13, a pull cable 14 and a hook 15, the left side and the right side of the telescopic block body are respectively provided with the cathode adsorption magnet 12 and the positive adsorption magnet 13, and the cathode adsorption magnet 12 and the positive adsorption magnet 13 are mainly used for being magnetically connected with other indirect blocks and test blocks. Installation hoist axle in the flexible piece block, the hoist axle is driven by motor 11, and 14 one end windings of cable are epaxial at the hoist, and the 14 other end of cable stretches out and connects couple 15 by flexible piece block, and wireless receiver 10 receives wireless controller 35 signal to it is rotatory through controller 9 control motor 11, in order to realize the shrink or relax cable 14.

The short indirect block 2 comprises a short indirect block body 16, a negative pole adsorption magnet 17, a height tester installation groove 18 and a positive pole adsorption magnet 19, and the short indirect block 2 and the long indirect block 3 are matched for adjusting the length of the whole device; the left side and the right side of the short indirect block body 16 are respectively provided with a negative pole adsorption magnet 17 and a positive pole adsorption magnet 19, and the negative pole adsorption magnet 17 and the positive pole adsorption magnet 19 are mainly used for being magnetically connected with other indirect blocks and test blocks; the back of the short indirect block 16 is provided with a height tester mounting slot 18, the height tester mounting slot 18 being used for mounting the height tester 7.

The length of the long indirect block 3 is greater than that of the short indirect block 2, the long indirect block 3 comprises a long indirect block body 20, a negative pole adsorption magnet 21, a height tester installation groove 22 and a positive pole adsorption magnet 23, and the long indirect block 3 and the short indirect block 2 are matched for adjusting the length of the whole device; the left side and the right side of the long indirect block body 20 are respectively provided with a negative pole adsorption magnet 21 and a positive pole adsorption magnet 23, and the negative pole adsorption magnet 21 and the positive pole adsorption magnet 23 are mainly used for being magnetically connected with other indirect blocks and test blocks; the back of the long indirect block body 20 is provided with a height tester installation groove 22, and the height tester installation groove 22 is used for installing the height tester 7.

The test block 4 comprises a test block body 24, a negative adsorption magnet 25, a microphone mounting hole 26 and a positive adsorption magnet 27, the negative adsorption magnet 25 and the positive adsorption magnet 27 are respectively mounted on the left side and the right side of the test block body 24, and the negative adsorption magnet 25 and the positive adsorption magnet 27 are mainly used for being in magnetic connection with other indirect blocks; the outer side of the test block body 24 is provided with a microphone mounting hole 26, and a rubber film is contained in the microphone mounting hole 26 and used for mounting the microphone 6.

The mounting hook 5 comprises a hanging ring 28 and a suction cup 29, wherein the suction cup 29 is mainly used for being adsorbed on the surface of the vehicle window glass or the ceiling glass or being adhered to the interior trim of the vehicle roof through an adhesive tape; the suspension loop 28 is mainly used for coupling with the hook 15.

The height tester 7 comprises a shell 30, and a wireless transmitter 32, a battery 33 and a distance sensor 34 which are arranged in the shell 30, wherein the distance sensor 34 is used for monitoring the ground clearance in the device vehicle, and the wireless transmitter 32 is used for transmitting height information to a wireless controller 35; the shell 30 is externally provided with a clamping groove 31 which is matched and connected with the height tester mounting groove of the short indirect block 2 or the long indirect block 3.

The embodiment also discloses a method for testing the mode of the cavity in the vehicle, so that the device for testing the mode of the cavity in the vehicle comprises the following steps:

(1) selecting a proper number of test blocks 4, short indirect blocks 2 and long indirect blocks 3 according to the width of a test space in the vehicle, connecting the test blocks through adsorption magnets between the test blocks to form a test group, and adsorbing two telescopic blocks 1 at the first two ends of the test group respectively;

(2) sucking a sucking disc 29 of the mounting hook 5 on the surface of vehicle window glass (ceiling glass and the like) or adhering the sucking disc to the interior of a vehicle roof through an adhesive tape, then pulling out a pull rope 14 in the telescopic block 1, and hanging a hook 15 on a hanging ring 28 of the mounting hook 5;

(3) the height tester 7 is clamped into a height tester mounting groove at the back of the short indirect block 2 or the long indirect block 3 through the clamping groove, the distance sensor 34 of the height tester 7 can test proper height data, and the microphone 6 is placed into the microphone mounting hole 25 of the testing block 4;

(4) the controller adjusts the motor 11 in the telescopic block 1 to contract (loosen) the cable 14, so as to control the test group to be at a proper control height, then the volume sound source is opened to perform a group of tests, and then the cable 14 is contracted (loosened) to prepare for the next group of tests.

(5) And (5) moving the adsorption or installation position of the installation hook 5 according to the steps (1) to (4) to gradually complete the in-vehicle sound cavity modal test.

The embodiment can meet the in-vehicle cavity modal test: (1) the length of the testing device can be adjusted by adjusting the number of the short indirect blocks and the long indirect blocks so as to meet the testing requirement of complex space in the vehicle; (2) the mounting hook can be adsorbed at a car window or a roof in a car and then fixed through an adhesive tape, and a guy cable of the telescopic block is attached to the mounting hook through the hook, so that the telescopic block is controlled to contract or the length of the guy cable is relaxed, and the height of the testing device can be adjusted; (3) the requirements of different testing densities can be met by adjusting the number of the testing blocks; (4) the short indirect block and the long indirect block can be provided with a height tester at the back, and can be radiated to the controller through a wireless device and can be read through the display screen of the controller.

The beneficial effect that this embodiment brought: (1) the device can flexibly adjust the length of the test group and the number of the test points, thereby meeting the test requirement of complex space in the vehicle; (2) the device avoids the process of repeatedly driving the car door to adjust by remotely controlling the height of the device, thereby saving a large amount of test time; (3) the device is tested by the height gauge, so that the inaccuracy of manual (tape measure) testing is avoided.

Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "X, Y, Z", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the scope of the present invention.