阅读说明：本技术 一种基于矢量传感器的现场隔声测量装置及测量方法 (On-site sound insulation measuring device and method based on vector sensor ) 是由 赵静 于 2021-01-05 设计创作，主要内容包括：本发明属于声学测量设备技术领域,具体地说,涉及一种基于矢量传感器的现场隔声测量装置,包括：扬声器(4)、矢量传感器(1)、第二声压传感器(2)和数据处理模块；矢量传感器(1)布放于待测材料(3)的声波入射端,第二声压传感器(2)布放于待测材料(3)的声波透射端,且矢量传感器(1)和第二声压传感器(2)相对放置,扬声器(4)与待测材料(3)之间呈不同的倾斜入射角相对放置；所述数据处理模块,用于得到入射的声压幅值；再对实时采集的透射声压响应信号进行处理,得到频域的透射声压响应；再基于入射的声压幅值和频域的透射声压响应,计算不同倾斜入射角的透射系数和隔声量。(The invention belongs to the technical field of acoustic measuring equipment, and particularly relates to a field sound insulation measuring device based on a vector sensor, which comprises: the system comprises a loudspeaker (4), a vector sensor (1), a second sound pressure sensor (2) and a data processing module; the vector sensor (1) is arranged at the sound wave incidence end of the material to be detected (3), the second sound pressure sensor (2) is arranged at the sound wave transmission end of the material to be detected (3), the vector sensor (1) and the second sound pressure sensor (2) are oppositely arranged, and the loudspeaker (4) and the material to be detected (3) are oppositely arranged at different oblique incidence angles; the data processing module is used for obtaining an incident sound pressure amplitude; processing the transmission sound pressure response signal acquired in real time to obtain the transmission sound pressure response of the frequency domain; and calculating transmission coefficients and sound insulation quantities of different oblique incident angles based on the incident sound pressure amplitude and the transmission sound pressure response of the frequency domain.)

1. An on-site acoustic measurement device based on a vector sensor, the device comprising: the system comprises a loudspeaker (4), a vector sensor (1), a second sound pressure sensor (2) and a data processing module;

the vector sensor (1) is arranged at the sound wave incidence end of the material to be detected (3), the second sound pressure sensor (2) is arranged at the sound wave transmission end of the material to be detected (3), the vector sensor (1) and the second sound pressure sensor (2) are oppositely arranged, and the loudspeaker (4) and the material to be detected (3) are oppositely arranged at different oblique incidence angles;

the vector sensor (1) is a one-dimensional vector sensor, which comprises: a first sound pressure sensor and a one-dimensional particle vibration velocity sensor;

the first sound pressure sensor is used for acquiring a total sound pressure response signal of the material (3) to be detected at an incident end in real time;

the one-dimensional particle vibration velocity sensor is used for collecting a total particle vibration velocity response signal of the material (3) to be detected at an incident end in real time;

the second sound pressure sensor (2) is used for acquiring a transmission sound pressure response signal of the material (3) to be detected at a transmission end in real time;

the data processing module is used for processing the total sound pressure response signal and the total particle vibration velocity response signal which are acquired in real time to obtain an incident sound pressure amplitude; and then processing the transmission sound pressure response signal acquired in real time to obtain the transmission sound pressure response of the frequency domain, and calculating the transmission coefficients and the sound insulation amount of different oblique incident angles based on the incident sound pressure amplitude and the transmission sound pressure response of the frequency domain.

2. The vector sensor-based on-site acoustic insulation measuring device according to claim 1, characterized in that the vector sensor (1) and the second acoustic pressure sensor (2) are oppositely arranged at a distance of the thickness of the material to be measured.

3. The vector sensor-based on-site acoustic measurement device according to claim 1, wherein the speaker (4) is placed obliquely with respect to the material (3) to be measured at an oblique angle of incidence of 0 to 70 degrees.

4. The vector sensor-based on-site acoustic insulation measurement device of claim 1, wherein the data processing module comprises: an incident data processing unit, a transmission data processing unit, and a transmission coefficient calculating unit;

the incident data processing unit is used for respectively carrying out convolution, Fourier transform and conjugate calculation processing on a total sound pressure response signal and a total particle vibration velocity response signal of the material (3) to be detected at an incident end, which are acquired in real time, to obtain an incident sound pressure amplitude;

the transmission data processing unit is used for sequentially carrying out convolution, Fourier transform and conjugate calculation on transmission sound pressure response signals of the material (3) to be detected at the transmission end, which are acquired in real time, so as to obtain the transmission sound pressure response of the frequency domain;

and the transmission coefficient calculating unit is used for calculating the transmission coefficient and the sound insulation quantity of the current oblique incidence angle based on the incident sound pressure amplitude and the transmission sound pressure response of the frequency domain.

5. The vector sensor-based field sound insulation measuring device according to claim 4, wherein the specific data processing process of the incident data processing unit is as follows:

exciting a loudspeaker by using an index sweep signal S (t), emitting the index sweep signal S (t) by the loudspeaker, collecting a total sound pressure response signal of a forward oblique incident angle theta by a first sound pressure sensor in a one-dimensional vector sensor (1), and performing convolution with an inverse filter corresponding to the index sweep signal S (t) to obtain a sound pressure pulse response p of the vector sensor_pu,impulse(ii) a One-dimensional particle vibration velocity sensor in the one-dimensional vector sensor (1) collects the total particle vibration velocity response signal of the forward oblique incidence angle theta, and the signal is convoluted with an inverse filter corresponding to the exponential sweep frequency signal S (t) to obtain the particle vibration velocity impulse response u of the vector sensor_pu,impulse；

To sound pressure impulse response p_pu,impulseSum particle velocity impulse response u_pu,impulseIntercepting a certain section of effective data, and performing Fourier transform to obtain corresponding frequency domain responses, namely sound pressure frequency responses p_{pu,impulse,fft}Frequency response u of particle vibration velocity_{pu,impulse,fft}；

To sound pressure frequency response p_{pu,impulse,fft}Sum particle velocity frequency response u_{pu,impulse,fft}Respectively carrying out conjugate calculation to obtain conjugate sound pressure frequency responseConjugate particle vibration velocity frequency response

According to the obtained p_{pu,impulse,fft}Andcalculating the complex sound intensity I of the material to be measured at the incident end_cx：

For the complex sound intensity I_cxObtaining the active sound intensity I by taking the real part_x：I_x＝real[I_cx]；

For the complex sound intensity I_cxObtaining the reactive sound intensity Q by taking the imaginary part_x：Q_x＝imag[I_cx]；

According to the obtained active sound intensity I_xAnd reactive sound intensity Q_xCalculating the maximum value | I of the complex sound intensity_cx|_max：

Wherein the content of the first and second substances, 1/2 being the square of the sound pressure amplitude; ρ is the density of air; c is the speed of sound in air;

according to the maximum value | I of the complex sound intensity_cx|_maxCalculating the incident sound energy P per unit area of the material to be measured_I：

Calculating the reflected sound energy P of the unit area of the material to be measured_R：

The incident sound pressure amplitude is calculated according to equation (3):

wherein, | p_iAnd | is the amplitude of the incident sound pressure.

6. The vector sensor-based field sound insulation measuring device according to claim 5, wherein the transmission data processing unit is used for processing the following specific data:

exciting the loudspeaker by using the exponential sweep signal S (t), collecting the transmission sound pressure response signal of the forward oblique incidence angle theta by using the second sound pressure sensor (2), and carrying out convolution with an inverse filter corresponding to the exponential sweep signal S (t) to obtain the transmission sound pressure impulse response p_t,impulse；

Impulse response p to transmitted sound pressure_{t,impulse,fft}Intercepting a certain section of effective data, and performing Fourier transform to obtain transmission sound pressure response p of the corresponding frequency domain_{t,impulse,fft}。

7. The vector sensor-based field sound insulation measuring device according to claim 5, wherein the transmission coefficient calculating unit is used for processing the following specific data:

calculating a transmission coefficient of the current oblique incidence angle theta based on the incident sound pressure amplitude and the transmission sound pressure response of the frequency domain:

and then calculating the field sound insulation TL of the current oblique incidence angle theta according to the transmission coefficient of the current oblique incidence angle theta obtained by calculation:

TL＝-20log₁₀|t_p| (8)。

8. a vector sensor-based field sound insulation measuring method, which is implemented based on the vector sensor-based field sound insulation measuring device of any one of claims 1 to 7, and which comprises:

the method comprises the steps that a first sound pressure sensor collects a total sound pressure response signal of a material (3) to be detected at an incident end in real time; the one-dimensional particle vibration velocity sensor collects a total particle vibration velocity response signal of a material (3) to be detected at an incident end in real time;

the data processing module is used for respectively carrying out convolution, Fourier transform and conjugate calculation processing on a total sound pressure response signal and a total particle vibration velocity response signal of the material (3) to be detected at the incident end, which are acquired in real time, and separating to obtain an incident sound pressure amplitude;

the second sound pressure sensor (2) collects a transmission sound pressure response signal of the material to be detected (3) at a transmission end in real time;

the data processing module carries out convolution, Fourier transform and conjugate calculation processing on the transmission sound pressure response signal acquired by the second sound pressure sensor (2) in sequence to obtain the transmission sound pressure response of a frequency domain, and then calculates the transmission coefficients and the sound insulation quantity of different oblique incidence angles based on the incident sound pressure amplitude and the transmission sound pressure response of the frequency domain.

9. The vector sensor-based field sound insulation measuring method according to claim 8, wherein the data processing module sequentially performs convolution, Fourier transform and conjugate calculation on a total sound pressure response signal and a total particle vibration velocity response signal of the material to be measured at an incident end, which are acquired in real time, and separates the signals to obtain an incident sound pressure amplitude; the specific process comprises the following steps:

exciting a loudspeaker by using an index sweep signal S (t), emitting the index sweep signal S (t) by the loudspeaker, collecting a total sound pressure response signal of a forward oblique incident angle theta by a first sound pressure sensor in a one-dimensional vector sensor (1), and performing convolution with an inverse filter corresponding to the index sweep signal S (t) to obtain a sound pressure pulse response p of the vector sensor_pu,impulse(ii) a One-dimensional particle vibration velocity sensor in the one-dimensional vector sensor (1) collects the total particle vibration velocity response signal of the forward oblique incidence angle theta, and the signal is convoluted with an inverse filter corresponding to the exponential sweep frequency signal S (t) to obtain the particle vibration velocity impulse response u of the vector sensor_pu,impulse；

To sound pressure impulse response p_pu,impulseSum particle velocity impulse response u_pu,impulseIntercepting a certain section of effective data, and performing Fourier transform to obtain corresponding frequency domain responses, namely sound pressure frequency responses p_{pu,impulse,fft}Frequency response u of particle vibration velocity_{pu,impulse,fft}；

To sound pressure frequency response p_{pu,impulse,fft}Sum particle velocity frequency response u_{pu,impulse,fft}Respectively carrying out conjugate calculation to obtain conjugate sound pressure frequency responseConjugate particle vibration velocity frequency response

According to the obtained p_{pu,impulse,fft}Andcalculating the complex sound intensity I of the material to be measured at the incident end_cx：

For the complex sound intensity I_cxObtaining the active sound intensity I by taking the real part_x：I_x＝real[I_cx]；

For the complex sound intensity I_cxObtaining the reactive sound intensity Q by taking the imaginary part_x：Q_x＝imag[I_cx]；

According to the obtained active sound intensity I_xAnd reactive sound intensity Q_xCalculating the maximum value | I of the complex sound intensity_cx|_max：

Wherein the content of the first and second substances, 1/2 being the square of the sound pressure amplitude; ρ is the density of air; c is the speed of sound in air;

according to the maximum value | I of the complex sound intensity_cx|_maxCalculating the incident sound energy P per unit area of the material to be measured_I：

Calculating the reflected sound energy P of the unit area of the material to be measured_R：

The incident sound pressure amplitude is calculated according to equation (3):

wherein, | p_iAnd | is the amplitude of the incident sound pressure.

10. The vector sensor-based field sound insulation measuring method according to claim 8, wherein the data processing module sequentially performs convolution, Fourier transform and conjugate calculation on the transmission sound pressure response signal acquired by the second sound pressure sensor (2) to obtain a transmission sound pressure response of a frequency domain, and then calculates transmission coefficients and sound insulation quantities of different oblique incident angles based on an incident sound pressure amplitude and the transmission sound pressure response of the frequency domain; the specific process comprises the following steps:

exciting the loudspeaker by using the exponential sweep signal S (t), collecting the transmission sound pressure response signal of the forward oblique incidence angle theta by using the second sound pressure sensor (2), and carrying out convolution with an inverse filter corresponding to the exponential sweep signal S (t) to obtain the transmission sound pressure impulse response p_t,impulse；

Impulse response p to transmitted sound pressure_{t,impulse,fft}Intercepting a certain section of effective data, and performing Fourier transform to obtain corresponding frequency domain transmission sound pressure response p_{t,impulse,fft}；

And then according to the incident sound pressure amplitude obtained by calculation of the formula (5), calculating the transmission coefficient of the current oblique incident angle theta:

and then calculating the field sound insulation TL of the current oblique incidence angle theta according to the transmission coefficient of the current oblique incidence angle theta obtained by calculation:

TL＝-20log₁₀|t_p| (8)。

Technical Field

The invention belongs to the technical field of acoustic measurement equipment, and particularly relates to a field sound insulation measurement device and a measurement method based on a vector sensor.

Background

Currently, existing sound insulation measurement methods for materials are generally based on standing wave tube measurement or reverberation room-anechoic room/reverberation room measurement. Based on the measurement of the standing wave tube, only the sound insulation of vertical incidence can be measured, and the test frequency is limited and is limited by the diameter of the standing wave tube; and the performance of the material can be changed in the standing wave tube. Based on a reverberation chamber-anechoic chamber/reverberation chamber measuring method, two expensive acoustic measuring chambers are needed, the field sound insulation test on the material cannot be carried out quickly and conveniently, and the sound insulation performance under different incident angles cannot be tested.

Disclosure of Invention

In order to solve the above-mentioned defects existing in the prior art, the invention provides a field sound insulation measuring device based on a vector sensor, which comprises: the system comprises a loudspeaker, a vector sensor, a second sound pressure sensor and a data processing module;

the vector sensor is arranged at the sound wave incidence end of the material to be detected, the second sound pressure sensor is arranged at the sound wave transmission end of the material to be detected, the vector sensor and the second sound pressure sensor are oppositely arranged, and the loudspeaker and the material to be detected are oppositely arranged at different oblique incidence angles;

the vector sensor is a one-dimensional vector sensor, which comprises: a first sound pressure sensor and a one-dimensional particle vibration velocity sensor;

the first sound pressure sensor is used for acquiring a total sound pressure response signal of the material to be detected at an incident end in real time;

the one-dimensional particle vibration velocity sensor is used for collecting a total particle vibration velocity response signal of a material to be detected at an incident end in real time;

the second sound pressure sensor is used for acquiring a transmission sound pressure response signal of the material to be detected at a transmission end in real time;

the data processing module is used for processing the total sound pressure response signal and the total particle vibration velocity response signal which are acquired in real time to obtain an incident sound pressure amplitude; and then processing the transmission sound pressure response signal acquired in real time to obtain the transmission sound pressure response of the frequency domain, and calculating the transmission coefficients and the sound insulation amount of different oblique incident angles based on the incident sound pressure amplitude and the transmission sound pressure response of the frequency domain.

As an improvement of the above technical solution, the distance between the vector sensor and the second acoustic pressure sensor is the thickness of the material to be measured.

As one improvement of the technical scheme, the inclined incidence angle of the loudspeaker and the material to be measured which are obliquely arranged relatively is 0-70 degrees.

As an improvement of the above technical solution, the data processing module includes: an incident data processing unit, a transmission data processing unit, and a transmission coefficient calculating unit;

the incident data processing unit is used for respectively carrying out convolution, Fourier transform and conjugate calculation processing on a total sound pressure response signal and a total particle vibration velocity response signal of the material to be detected at an incident end, which are acquired in real time, to obtain an incident sound pressure amplitude;

the transmission data processing unit is used for sequentially carrying out convolution, Fourier transform and conjugate calculation on transmission sound pressure response signals of the material to be detected at the transmission end, which are acquired in real time, so as to obtain the transmission sound pressure response of the frequency domain;

and the transmission coefficient calculating unit is used for calculating the transmission coefficient and the sound insulation quantity of the current oblique incidence angle based on the incident sound pressure amplitude and the transmission sound pressure response of the frequency domain.

As an improvement of the above technical solution, a specific data processing process of the incident data processing unit is as follows:

exciting a loudspeaker by using an index sweep signal S (t), emitting the index sweep signal S (t) by the loudspeaker, collecting a total sound pressure response signal of a forward oblique incident angle theta by a first sound pressure sensor in a one-dimensional vector sensor, and carrying out convolution with an inverse filter corresponding to the index sweep signal S (t) to obtain a sound pressure pulse response p of the vector sensor_pu,impulse(ii) a One-dimensional particle vibration velocity sensor in the one-dimensional vector sensor collects total particle vibration velocity response signals of a forward oblique incidence angle theta, and the total particle vibration velocity response signals are convoluted with an inverse filter corresponding to the exponential frequency sweep signal S (t) to obtain particle vibration velocity impulse response u of the vector sensor_pu,impulse；

To sound pressure impulse response p_pu,impulseSum particle velocity impulse response u_pu,impulseIntercepting a certain section of effective data, and performing Fourier transform to obtain corresponding frequency domain responses, namely sound pressure frequency responses p_{pu,impulse,fft}Frequency response u of particle vibration velocity_{pu,impulse,fft}；

To sound pressure frequency response p_{pu,impulse,fft}Velocity of harmonic vibrationFrequency response u_{pu,impulse,fft}Respectively carrying out conjugate calculation to obtain conjugate sound pressure frequency responseConjugate particle vibration velocity frequency response

According to the obtained p_{pu,impulse,fft}Andcalculating the complex sound intensity I of the material to be measured at the incident end_cx：

For the complex sound intensity I_cxObtaining the active sound intensity I by taking the real part_x：I_x＝real[I_cx]；

For the complex sound intensity I_cxObtaining the reactive sound intensity Q by taking the imaginary part_x：Q_x＝imag[I_cx]；

According to the obtained active sound intensity I_xAnd reactive sound intensity Q_xCalculating the maximum value | I of the complex sound intensity_cx|_max：

Wherein the content of the first and second substances, 1/2 being the square of the sound pressure amplitude; ρ is the density of air; c is the speed of sound in air;

according to the maximum value | I of the complex sound intensity_cx|_maxCalculating the unit area of the material to be measuredIncident sound energy P_I：

Calculating the reflected sound energy P of the unit area of the material to be measured_R：

The incident sound pressure amplitude is calculated according to equation (3):

wherein, | p_iAnd | is the amplitude of the incident sound pressure.

As an improvement of the above technical solution, a specific data processing process of the transmission data processing unit is as follows:

exciting the loudspeaker by using the exponential sweep signal S (t), collecting the transmission sound pressure response signal of the forward oblique incidence angle theta by using the second sound pressure sensor, and performing convolution with the inverse filter corresponding to the exponential sweep signal S (t) to obtain the transmission sound pressure impulse response p_t,impulse；

Impulse response p to transmitted sound pressure_{t,impulse,fft}Intercepting a certain section of effective data, and performing Fourier transform to obtain transmission sound pressure response p of the corresponding frequency domain_{t,impulse,fft}。

As an improvement of the above technical solution, a specific data processing procedure of the transmission coefficient calculating unit is as follows:

calculating a transmission coefficient of the current oblique incidence angle theta based on the incident sound pressure amplitude and the transmission sound pressure response of the frequency domain:

and then calculating the field sound insulation TL of the current oblique incidence angle theta according to the transmission coefficient of the current oblique incidence angle theta obtained by calculation:

TL＝-20log₁₀|t_p| (8)。

the invention also provides a field sound insulation measuring method based on the vector sensor, which comprises the following steps:

the method comprises the steps that a first sound pressure sensor collects a total sound pressure response signal of a material to be detected at an incident end in real time; the one-dimensional particle vibration velocity sensor collects a total particle vibration velocity response signal of a material to be detected at an incident end in real time;

the data processing module is used for respectively carrying out convolution, Fourier transform and conjugate calculation processing on a total sound pressure response signal and a total particle vibration velocity response signal of the material to be detected at the incident end, which are acquired in real time, and separating to obtain an incident sound pressure amplitude;

the second sound pressure sensor collects a transmission sound pressure response signal of the material to be detected at a transmission end in real time;

and the data processing module performs convolution, Fourier transform and conjugate calculation processing on the transmission sound pressure response signal acquired by the second sound pressure sensor in sequence to obtain the transmission sound pressure response of a frequency domain, and calculates the transmission coefficients and the sound insulation amount of different oblique incidence angles based on the incident sound pressure amplitude and the transmission sound pressure response of the frequency domain.

As one improvement of the above technical solution, the data processing module performs convolution, fourier transform, and conjugate calculation processing on a total sound pressure response signal and a total particle vibration velocity response signal of the material to be detected at the incident end, which are acquired in real time, in sequence, and separates the signals to obtain an incident sound pressure amplitude; the specific process comprises the following steps:

exciting a loudspeaker by using an index sweep signal S (t), emitting the index sweep signal S (t) by the loudspeaker, collecting a total sound pressure response signal of a forward oblique incident angle theta by a first sound pressure sensor in a one-dimensional vector sensor, and carrying out convolution with an inverse filter corresponding to the index sweep signal S (t) to obtain a sound pressure pulse response p of the vector sensor_pu,impulse(ii) a The one-dimensional particle vibration velocity sensor in the one-dimensional vector sensor collects the total particle vibration of the front oblique incidence angle thetaConvolving the velocity response signal with an inverse filter corresponding to the exponential sweep signal S (t) to obtain a particle velocity impulse response u of the vector sensor_pu,impulse；

To sound pressure impulse response p_pu,impulseSum particle velocity impulse response u_pu,impulseIntercepting a certain section of effective data, and performing Fourier transform to obtain corresponding frequency domain responses, namely sound pressure frequency responses p_{pu,impulse,fft}Frequency response u of particle vibration velocity_{pu,impulse,fft}；

To sound pressure frequency response p_{pu,impulse,fft}Sum particle velocity frequency response u_{pu,impulse,fft}Respectively carrying out conjugate calculation to obtain conjugate sound pressure frequency responseConjugate particle vibration velocity frequency response

According to the obtained p_{pu,impulse,fft}Andcalculating the complex sound intensity I of the material to be measured at the incident end_cx：

For the complex sound intensity I_cxObtaining the active sound intensity I by taking the real part_x：I_x＝real[I_cx]；

For the complex sound intensity I_cxObtaining the reactive sound intensity Q by taking the imaginary part_x：Q_x＝imag[I_cx]；

According to the obtained active sound intensity I_xAnd reactive sound intensity Q_xCalculating the maximum value | I of the complex sound intensity_cx|_max：

Wherein the content of the first and second substances, 1/2 being the square of the sound pressure amplitude; ρ is the density of air; c is the speed of sound in air;

according to the maximum value | I of the complex sound intensity_cx|_maxCalculating the incident sound energy P per unit area of the material to be measured_I：

Calculating the reflected sound energy P of the unit area of the material to be measured_R：

The incident sound pressure amplitude is calculated according to equation (3):

wherein, | p_iAnd | is the amplitude of the incident sound pressure.

As one improvement of the above technical solution, the data processing module performs convolution, fourier transform, and conjugate calculation processing on the transmission sound pressure response signal acquired by the second sound pressure sensor in sequence to obtain a transmission sound pressure response of a frequency domain, and then calculates transmission coefficients and sound insulation amounts of different oblique incident angles based on an incident sound pressure amplitude and the transmission sound pressure response of the frequency domain; the specific process comprises the following steps:

exciting the loudspeaker by using an exponential sweep frequency signal S (t), collecting a transmission sound pressure response signal of a forward inclined incident angle theta by using a second sound pressure sensor, and comparing the transmission sound pressure response signal with the exponential sweep frequency signal S (t)Convolution is carried out on the inverse filter corresponding to the signal S (t) to obtain the impulse response p of the transmission sound pressure_t,impulse；

Impulse response p to transmitted sound pressure_{t,impulse,fft}Intercepting a certain section of effective data, and performing Fourier transform to obtain corresponding frequency domain transmission sound pressure response p_{t,impulse,fft}；

And then according to the incident sound pressure amplitude obtained by calculation of the formula (5), calculating the transmission coefficient of the current oblique incident angle theta:

and then calculating the field sound insulation TL of the current oblique incidence angle theta according to the transmission coefficient of the current oblique incidence angle theta obtained by calculation:

TL＝-20log₁₀|t_p| (8)。

compared with the prior art, the invention has the beneficial effects that:

1. the measuring device can realize the field, quick and different incident angle sound insulation performance measurement aiming at a certain material;

2. the measuring device can separate the incident sound pressure amplitude, the incident particle vibration velocity amplitude, the transmission coefficients under different oblique incidence angles and the reflected sound energy on site.

Drawings

Fig. 1 is a schematic structural diagram of a field sound insulation measuring device based on a vector sensor.

Reference numerals:

1. vector sensor 2 and second acoustic pressure sensor

3. Material 4 to be measured and speaker

Detailed Description

The invention will now be further described with reference to the accompanying drawings.

As shown in figure 1, the invention provides a field sound insulation measuring device based on a vector sensor, which utilizes a one-dimensional vector sensor and a sound pressure sensor to be respectively and correspondingly arranged at an incident end and a transmission end of a material to be measured, can realize field rapid sound insulation measurement on a certain material, and can measure sound insulation performance under different incident angles.

The invention provides a field sound insulation measuring device based on a vector sensor, which comprises: the system comprises a loudspeaker 4, a vector sensor 1, a second sound pressure sensor 2 and a data processing module;

the vector sensor 1 is arranged at the sound wave incidence end of the material to be detected 3, the second sound pressure sensor 2 is arranged at the sound wave transmission end of the material to be detected 3, the vector sensor 1 and the second sound pressure sensor 2 are oppositely arranged, and the loudspeaker 4 and the material to be detected 3 are oppositely arranged at different oblique incidence angles;

the vector sensor 1 is used for respectively acquiring a total sound pressure response signal (comprising an incident sound pressure response signal and a reflected sound pressure response signal) and a total particle vibration speed response signal (comprising an incident particle vibration speed response signal and a reflected particle vibration speed response signal) of a material to be detected at an incident end in real time;

specifically, the vector sensor 1 is a one-dimensional vector sensor, which includes: a first sound pressure sensor and a one-dimensional particle vibration velocity sensor;

the first sound pressure sensor is used for acquiring a total sound pressure response signal of the material to be detected at an incident end in real time;

the one-dimensional particle vibration velocity sensor is used for collecting a total particle vibration velocity response signal of a material to be measured at an incident end in real time.

The second sound pressure sensor 2 is used for acquiring a transmission sound pressure response signal of the material to be detected at a transmission end in real time;

the data processing module is used for processing the total sound pressure response signal and the total particle vibration velocity response signal which are acquired in real time to obtain an incident sound pressure amplitude; and then processing the transmission sound pressure response signal acquired in real time to obtain the transmission sound pressure response of the frequency domain, and calculating the transmission coefficients and the sound insulation amount of different oblique incident angles based on the incident sound pressure amplitude and the transmission sound pressure response of the frequency domain.

Wherein, the first sound pressure sensor and the second sound pressure sensor 2 are both sound pressure sensors.

Optionally, the distance between the vector sensor 1 and the second acoustic pressure sensor 2 is the thickness of the material to be measured.

Optionally, the speaker 4 is placed obliquely to the material 3 to be measured at an oblique incident angle of 0 to 70 degrees.

Wherein the data processing module comprises: the device comprises an incident data processing unit, a transmission data processing unit and a transmission coefficient and sound insulation amount calculating unit;

the incident data processing unit is used for respectively carrying out convolution, Fourier transform and conjugate calculation processing on a total sound pressure response signal and a total particle vibration velocity response signal of the material to be detected at an incident end, which are acquired in real time, and separating to obtain an incident sound pressure amplitude and an incident particle vibration velocity amplitude;

specifically, an index frequency sweep signal S (t) is used for exciting a loudspeaker, the loudspeaker emits the index frequency sweep signal S (t), a first sound pressure sensor in the one-dimensional vector sensor 1 collects a total sound pressure response signal of a forward oblique incident angle theta, and the total sound pressure response signal is convolved with an inverse filter corresponding to the index frequency sweep signal S (t) to obtain a sound pressure impulse response p of the vector sensor_pu,impulse(ii) a The one-dimensional particle vibration velocity sensor in the one-dimensional vector sensor 1 collects a total particle vibration velocity response signal of a forward oblique incidence angle theta, and the total particle vibration velocity response signal is convoluted with an inverse filter corresponding to the exponential frequency sweep signal S (t) to obtain a particle vibration velocity impulse response u of the vector sensor_pu,impulse；

To sound pressure impulse response p_pu,impulseSum particle velocity impulse response u_pu,impulseIntercepting a certain section of effective data, and performing Fourier transform to obtain corresponding frequency domain responses, namely sound pressure frequency responses p_{pu,impulse,fft}Frequency response u of particle vibration velocity_{pu,impulse,fft}；

To sound pressure frequency response p_{pu,impulse,fft}Sum particle velocity frequency response u_{pu,impulse,fft}Respectively carrying out conjugate calculation to obtain conjugate sound pressure frequency responseConjugate particle vibration velocity frequency response

According to the obtained p_{pu,impulse,fft}Andcalculating the complex sound intensity I of the material to be measured at the incident end_cx：

For the complex sound intensity I_cxObtaining the active sound intensity I by taking the real part_x：I_x＝real[I_cx]；

For the complex sound intensity I_cxObtaining the reactive sound intensity Q by taking the imaginary part_x：Q_x＝imag[I_cx]；

According to the obtained active sound intensity I_xAnd reactive sound intensity Q_xCalculating the maximum value | I of the complex sound intensity_cx|_max：

Wherein the content of the first and second substances, 1/2 being the square of the sound pressure amplitude; ρ is the density of air; c is the speed of sound in air;

according to the maximum value | I of the complex sound intensity_cx|_maxCalculating the incident sound energy P per unit area of the material to be measured_I：

Calculating the reflected sound energy P of the unit area of the material to be measured_R：

The incident sound pressure amplitude is calculated according to equation (3):

wherein, | p_iL is the amplitude of the incident sound pressure;

calculating the amplitude of the incident particle vibration velocity according to equation (3):

wherein, | u_iAnd | is the amplitude of the vibration velocity of the incident particle.

The transmission data processing unit is used for sequentially carrying out convolution, Fourier transform and conjugate calculation on transmission sound pressure response signals of the material to be detected 3 at the transmission end, which are acquired in real time, so as to obtain transmission sound pressure response of a frequency domain;

specifically, the loudspeaker is excited by an exponential frequency sweep signal S (t), a second sound pressure sensor collects a transmission sound pressure response signal of a forward oblique incidence angle theta, and the transmission sound pressure response signal is convolved with an inverse filter corresponding to the exponential frequency sweep signal S (t) to obtain a transmission sound pressure impulse response p_t,impulse；

Impulse response p to transmitted sound pressure_{t,impulse,fft}Intercepting a certain section of effective data, and performing Fourier transform to obtain transmission sound pressure response p of the corresponding frequency domain_{t,impulse,fft}。

And the transmission coefficient calculating unit is used for calculating the transmission coefficient and the sound insulation quantity of the current oblique incidence angle based on the incident sound pressure amplitude and the transmission sound pressure response of the frequency domain.

Specifically, according to the incident sound pressure amplitude calculated by the formula (5), the transmission coefficient of the current tilt incident angle θ is calculated:

and then calculating the field sound insulation TL of the current oblique incidence angle theta according to the transmission coefficient of the current oblique incidence angle theta obtained by calculation:

TL＝-20log₁₀|t_p| (8)。

the invention also provides a field sound insulation measuring method based on the vector sensor, which comprises the following steps:

the method comprises the steps that a first sound pressure sensor collects a total sound pressure response signal of a material to be detected at an incident end in real time; the one-dimensional particle vibration velocity sensor collects a total particle vibration velocity response signal of a material to be detected at an incident end in real time;

the data processing module is used for respectively carrying out convolution, Fourier transform and conjugate calculation processing on a total sound pressure response signal and a total particle vibration velocity response signal of the material to be detected at the incident end, which are acquired in real time, and separating to obtain an incident sound pressure amplitude and an incident particle vibration velocity amplitude;

specifically, the speaker is excited by an index sweep signal S (t), the speaker emits the index sweep signal S (t), a second sound pressure sensor in the one-dimensional vector sensor 1 collects a total sound pressure response signal of a forward oblique incident angle theta, and the total sound pressure response signal is convolved with an inverse filter corresponding to the index sweep signal S (t) to obtain a sound pressure impulse response p of the vector sensor_pu,impulse(ii) a The one-dimensional particle vibration velocity sensor in the one-dimensional vector sensor 1 collects a total particle vibration velocity response signal of a forward oblique incidence angle theta, and the total particle vibration velocity response signal is convoluted with an inverse filter corresponding to the exponential frequency sweep signal S (t) to obtain a particle vibration velocity impulse response u of the vector sensor_pu,impulse；

To sound pressure impulse response p_pu,impulseSum particle velocity impulse response u_pu,impulseIntercepting a certain section of effective data and performing Fourier transformTransforming to obtain corresponding frequency domain responses, namely sound pressure frequency responses p_{pu,impulse,fft}Frequency response u of particle vibration velocity_{pu,impulse,fft}；

To sound pressure frequency response p_{pu,impulse,fft}Sum particle velocity frequency response u_{pu,impulse,fft}Respectively carrying out conjugate calculation to obtain conjugate sound pressure frequency responseConjugate particle vibration velocity frequency response

According to the obtained p_{pu,impulse,fft}Andcalculating the complex sound intensity I of the material to be measured at the incident end_cx：

For the complex sound intensity I_cxObtaining the active sound intensity I by taking the real part_x：I_x＝real[I_cx]；

For the complex sound intensity I_cxObtaining the reactive sound intensity Q by taking the imaginary part_x：Q_x＝imag[I_cx]；

According to the obtained active sound intensity I_xAnd reactive sound intensity Q_xCalculating the maximum value | I of the complex sound intensity_cx|_max：

Wherein the content of the first and second substances, 1/2 being the square of the sound pressure amplitude; ρ is the density of air; c is the speed of sound in air;

according to the maximum value | I of the complex sound intensity_cx|_maxCalculating the incident sound energy P per unit area of the material to be measured_I：

Calculating the reflected sound energy P of the unit area of the material to be measured_R：

The incident sound pressure amplitude is calculated according to equation (3):

wherein, | p_iL is the amplitude of the incident sound pressure;

calculating the amplitude of the incident particle vibration velocity according to equation (3):

wherein, | u_iAnd | is the amplitude of the vibration velocity of the incident particle.

The second sound pressure sensor 2 collects a transmission sound pressure response signal of the material to be detected 3 at a transmission end in real time;

the data processing module sequentially performs convolution, Fourier transform and conjugate calculation on the transmission sound pressure response signal acquired by the second sound pressure sensor 2 to obtain a transmission sound pressure response of a frequency domain, calculates transmission coefficients of different oblique incidence angles based on the incident sound pressure amplitude and the transmission sound pressure response of the frequency domain, and obtains a corresponding field sound insulation amount according to the calculated transmission coefficients.

Specifically, the loudspeaker is excited by an exponential frequency sweep signal S (t), a second sound pressure sensor collects a transmission sound pressure response signal of a forward oblique incidence angle theta, and the transmission sound pressure response signal is convolved with an inverse filter corresponding to the exponential frequency sweep signal S (t) to obtain a transmission sound pressure impulse response p_t,impulse；

Impulse response p to transmitted sound pressure_{t,impulse,fft}Intercepting a certain section of effective data, and performing Fourier transform to obtain transmission sound pressure response p of the corresponding frequency domain_{t,impulse,fft}；

Calculating the transmission coefficient t of the material to be measured at the current oblique incidence angle theta according to the incident sound pressure amplitude calculated by the formula (5)_p：

And then according to the calculated transmission coefficient, obtaining the field sound insulation quantity.

And then calculating the field sound insulation TL of the current oblique incidence angle theta according to the transmission coefficient of the current oblique incidence angle theta obtained by calculation:

TL＝-20log₁₀|t_p| (8)。

finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.