CN-121977854-A - Method, device and equipment for evaluating panel acoustic sensitivity based on white car body

CN121977854ACN 121977854 ACN121977854 ACN 121977854ACN-121977854-A

Abstract

The application discloses a panel acoustic sensitivity evaluation method, device and equipment based on a white car body, and relates to the technical field of vehicle NVH performance analysis, wherein the method comprises the steps of defining acoustic sensitivity and contribution coefficients, acquiring the white car body to be evaluated, dividing a wall plate of the white car body into a plurality of test units, and determining an excitation point, an excitation mode and a response point; exciting excitation is carried out on excitation points based on a determined excitation mode, frequency response functions of response points are recorded to obtain acoustic sensitivity, panel forced vibration response transfer functions and panel vibration radiation sound pressure transfer functions, panel contribution amounts of all test units are calculated, peak frequency in an acoustic sensitivity curve is used as target frequency, contribution coefficients of all the test units are calculated for each target frequency to generate a panel acoustic contribution distribution diagram, and panel acoustic sensitivity evaluation is achieved. The application can accurately identify the key plate area and realize accurate evaluation of the acoustic sensitivity of the plate.

Inventors

CHEN MING

Assignees

襄阳达安汽车检测中心有限公司

Dates

Publication Date: 20260505
Application Date: 20260130

Claims (10)

1. A panel acoustic sensitivity evaluation method based on a body-in-white, characterized by comprising: Defining acoustic sensitivity and contribution coefficient, obtaining a white car body to be evaluated, dividing a wallboard of the white car body into a plurality of test units, and determining an excitation point, an excitation mode and a response point; Exciting excitation is carried out on the excitation points based on the determined excitation mode, the frequency response function of the response points is recorded, so that the acoustic sensitivity, the plate forced vibration response transfer function and the plate vibration radiation sound pressure transfer function are obtained, and the plate contribution of each test unit is calculated; And taking the peak frequency in the acoustic sensitivity curve as a target frequency, and calculating the contribution coefficient of all the test units for each target frequency to generate a panel acoustic contribution distribution map so as to realize panel acoustic sensitivity evaluation.
2. A method for evaluating acoustic sensitivity of a body-in-white based panel as claimed in claim 1, wherein for acoustic sensitivity, specifically: Wherein, the Representing the acoustic sensitivity of the device, Represents the sound pressure output at a point in the sound field, A linear input representing the speed of vibration of the surface of the structure, Which represents the angular frequency of the light emitted by the light source, Representing the forced vibration response transfer function of the plate, Representing the plate vibration radiation sound pressure transfer function.
3. A method for evaluating acoustic sensitivity of a body-in-white based panel as defined in claim 1, wherein the defining comprises, for the contribution coefficients: If the influence of the propagation paths is set to be uncorrelated with each other based on the noise propagation paths, the noise in the vehicle Is the structure-borne noise And airborne noise Is to ignore airborne noise Then: Wherein, the Representing the number of test units to be singulated into boards under test, Represent the first Structure-borne noise of individual test cells ; For the first Applying exciting force to each test unit to obtain the first Acoustic sensitivity of individual test units , Acoustic sensitivity after vector synthesis The representation, wherein, Again, the total acoustic sensitivity, then: ; Defining contribution coefficients Is the first Acoustic sensitivity of individual test units At the total acoustic sensitivity Projection on, represent the vibration plate to total sound pressure contribution degree, then: Wherein, the Representation of Is provided with a die for the mold, Representation of Is provided with a die for the mold, Representation of And Cosine of the included angle.
4. A method for evaluating acoustic sensitivity of a body-in-white based panel as claimed in claim 3, wherein: When (when) If the value is positive, the acoustic sensitivity of the current test unit is in phase with the total acoustic sensitivity, and the current test unit is a positive contribution area; When (when) When the value is negative, the acoustic sensitivity of the current test unit is opposite to the total acoustic sensitivity, and the current test unit is a negative contribution area; the test unit whose absolute value is smaller than the preset value is the low contribution area.
5. A method for evaluating the acoustic sensitivity of a body-in-white based panel according to claim 1, wherein the steps of obtaining the body-in-white to be evaluated and dividing the panel of the body-in-white into a plurality of test units and determining the excitation point, the excitation mode and the response point comprise: Acquiring a white body to be evaluated, and dividing the acquired body panel of the white body into a plurality of test units; and determining the excitation point, the excitation mode and the response point of the acquired white car body.
6. A method for evaluating acoustic sensitivity of a body-in-white based panel as defined in claim 5, wherein: The excitation point comprises a vehicle body front cabin right suspension mounting point and a passenger cabin driver right ear position; The excitation mode comprises excitation and sound source excitation; the response points comprise vibration response points and sound pressure transfer function response points, the vibration response points are located at the main beam structure of the key wall plate of the vehicle body, and the sound pressure transfer function response points are located at the right ear position of a driver of the passenger cabin.
7. The method for evaluating the acoustic sensitivity of a panel based on a white car body according to claim 6, wherein the exciting excitation is performed on the excitation points based on the determined excitation mode, the frequency response function of the response points is recorded to obtain the acoustic sensitivity, the panel forced vibration response transfer function, the panel vibration radiation sound pressure transfer function, and the panel contribution of each test unit is calculated, and the method specifically comprises: exciting and exciting a right suspension mounting point of a front cabin of the automobile body, recording frequency response functions of all response points, and obtaining acoustic sensitivity and a plate forced vibration response transfer function; performing sound source excitation on the right ear position of a driver in the passenger cabin, and recording the frequency response function of each response point to obtain a plate vibration radiation sound pressure transfer function; And calculating the obtained acoustic sensitivity, the plate forced vibration response transfer function and the plate vibration radiation sound pressure transfer function based on the definition of the acoustic sensitivity to obtain the plate contribution of each test unit.
8. The method for evaluating panel acoustic sensitivity based on white body as claimed in claim 1, wherein the step of calculating the contribution coefficients of all the test units for each target frequency by using the peak frequency in the acoustic sensitivity curve as the target frequency to generate the panel acoustic contribution distribution map, and the step of evaluating the panel acoustic sensitivity specifically comprises: Taking the peak frequency in the acoustic sensitivity curve as a target frequency, and calculating the contribution coefficients of all the test units for each target frequency, so as to generate a panel acoustic contribution distribution diagram; and marking positive contribution areas, negative contribution areas and low contribution areas in the panel acoustic contribution distribution diagram by adopting different colors or patterns, realizing panel acoustic sensitivity evaluation, and carrying out corresponding application processing on different types of contribution areas.
9. A panel acoustic sensitivity evaluation device based on a body-in-white, characterized by comprising: The test building module is used for defining acoustic sensitivity and contribution coefficient, acquiring a white car body to be evaluated, dividing a wallboard of the white car body into a plurality of test units, and determining an excitation point, an excitation mode and a response point; The test proceeding module is used for exciting the exciting points based on the determined exciting mode, recording the frequency response function of the response points so as to obtain the acoustic sensitivity, the plate forced vibration response transfer function and the plate vibration radiation sound pressure transfer function, and calculating to obtain the plate contribution of each test unit; And the test analysis module is used for taking the peak frequency in the acoustic sensitivity curve as a target frequency, calculating the contribution coefficient of all the test units for each target frequency to generate a panel acoustic contribution distribution diagram, and realizing panel acoustic sensitivity evaluation.
10. A body-in-white based panel acoustic sensitivity evaluation apparatus, characterized in that the body-in-white based panel acoustic sensitivity evaluation apparatus comprises a processor, a memory, and a body-in-white based panel acoustic sensitivity evaluation program stored on the memory and executable by the processor, wherein the body-in-white based panel acoustic sensitivity evaluation program, when executed by the processor, implements the steps of the body-in-white based panel acoustic sensitivity evaluation method according to any one of claims 1 to 8.

Description

Method, device and equipment for evaluating panel acoustic sensitivity based on white car body Technical Field The application relates to the technical field of vehicle NVH (Noise, vibration, harshness, noise, vibration and harshness) performance analysis, in particular to a panel acoustic sensitivity evaluation method, device and equipment based on a white car body. Background Acoustic sensitivity analysis includes car body acoustic sensitivity (NTF) and panel acoustic sensitivity (ATV). ATVs are also known as sound field contribution vectors, describing the relationship of the linear input of the structural surface vibration velocity to the sound pressure output at a point within the sound field when the sound field is a linear system. The passenger compartment of a vehicle is mainly composed of thin plate members, so that the vibration characteristics of the thin plates have great significance for structural radiation noise. When the thin plate is in steady-state vibration under the excitation action, a disturbance field is generated in the medium, and the movement drives the surrounding medium to move, namely, the uniform, non-rotating ideal gas with viscosity not playing a main role is driven to move, so that vibration energy is transmitted. Structural radiated noise is caused by the vibration of all panels and the contribution of different regions of the body panel to the sound pressure at any location within the passenger compartment is different. In the traditional method, the influence of the vibration phase of each plate is usually ignored, and the main sound source is judged only according to the vibration amplitude, so that the effect after the structure is modified is not ideal. In addition, there is currently a lack of accurate quantification of the panel contribution, and targeted acoustic treatment is difficult to achieve, which is detrimental to the light weight requirements. Therefore, there is a need for a method capable of accurately evaluating the acoustic sensitivity of a panel to optimize the acoustic environment in a vehicle. Disclosure of Invention The application provides a panel acoustic sensitivity evaluation method, device and equipment based on a white automobile body, which can accurately identify key panel areas and realize accurate panel acoustic sensitivity evaluation. In a first aspect, an embodiment of the present application provides a panel acoustic sensitivity evaluation method based on a body-in-white, the panel acoustic sensitivity evaluation method based on the body-in-white including: Defining acoustic sensitivity and contribution coefficient, obtaining a white car body to be evaluated, dividing a wallboard of the white car body into a plurality of test units, and determining an excitation point, an excitation mode and a response point; Exciting excitation is carried out on the excitation points based on the determined excitation mode, the frequency response function of the response points is recorded, so that the acoustic sensitivity, the plate forced vibration response transfer function and the plate vibration radiation sound pressure transfer function are obtained, and the plate contribution of each test unit is calculated; And taking the peak frequency in the acoustic sensitivity curve as a target frequency, and calculating the contribution coefficient of all the test units for each target frequency to generate a panel acoustic contribution distribution map so as to realize panel acoustic sensitivity evaluation. With reference to the first aspect, in one embodiment, for acoustic sensitivity, specific expression is as follows: Wherein, the Representing the acoustic sensitivity of the device,Represents the sound pressure output at a point in the sound field,A linear input representing the speed of vibration of the surface of the structure,Which represents the angular frequency of the light emitted by the light source,Representing the forced vibration response transfer function of the plate,Representing the plate vibration radiation sound pressure transfer function. With reference to the first aspect, in one implementation manner, for the contribution coefficient, the specific defining process includes: If the influence of the propagation paths is set to be uncorrelated with each other based on the noise propagation paths, the noise in the vehicle Is the structure-borne noiseAnd airborne noiseIs to ignore airborne noiseThen: Wherein, the Representing the number of test units to be singulated into boards under test,Represent the firstStructure-borne noise of individual test cells; For the firstApplying exciting force to each test unit to obtain the firstAcoustic sensitivity of individual test units,Acoustic sensitivity after vector synthesisThe representation, wherein,Again, the total acoustic sensitivity, then: ; Defining contribution coefficients Is the firstAcoustic sensitivity of individual test unitsAt the total acoustic sensitivityProjection on, represent t