Path analysis-based whole vehicle air sound transfer function contribution rate analysis method

Abstract

The invention relates to a path analysis-based finished automobile air sound transfer function contribution rate analysis method. The method comprises the following steps of: analyzing a contribution rate of each path sound transfer function to a finished automobile sound transfer function by applying a statistical method; analyzing the contribution rate of each unit to the sound transfer function of each path; analyzing the contribution rate of each part to each unit; and analyzing the contribution rate of a certain part to the sound transfer function of the whole vehicle through mathematical operation. According to the finished automobile air sound transfer function contribution rate analysis method, finished automobile air sound transfer function contribution rate analysis is carried out in the early stage of an automobile research and development project, the contribution rate of each part of an acoustic package to the finished automobile air sound transfer function is obtained, accurate control over automobile acoustic performance is achieved, and then performance optimization and cost and weight reduction are achieved; the method is applied to the design stage of automobile research and development, the parts are changed before the arrangement position and the space are not locked, manpower and development cost are reduced, cost reduction and weight reduction can be carried out on the parts low in contribution rate, and the acoustic performance of the whole automobile is improved through optimal design of the parts high in contribution rate.

Description

Technical Field

[0001] The invention belongs to the field of automobile technology, and in particular relates to a method for analyzing the contribution rate of airborne sound transmission function of a whole vehicle based on path analysis. Background Art

[0002] At present, most of the contribution analysis of vehicle noise is based on test data to solve the problem of large noise. However, the contribution analysis based on test data is only done in the late stage of automobile development. In the late stage of automobile development, if you want to change the automobile parts, you need to update the drawings and molds, which requires a lot of manpower and cost. In addition, the layout position and space are locked in the early stage, and the degree of change is limited. Summary of the invention

[0003] The purpose of the present invention is to provide a method for analyzing the contribution rate of the airborne sound transmission function of a whole vehicle based on path analysis, so as to solve the problem of analyzing the contribution rate of the airborne sound transmission function of the whole vehicle in the early stage of an automobile research and development project and obtaining the contribution rate of each component of the acoustic package to the airborne sound transmission function of the whole vehicle.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A method for analyzing the contribution rate of vehicle airborne sound transmission function based on path analysis comprises the following steps:

[0006] A. Use statistical methods to analyze the contribution of each path's acoustic transmission function to the vehicle's acoustic transmission function;

[0007] B. Analyze the contribution rate of each unit to the acoustic transmission function of each path;

[0008] C. Analyze the contribution rate of each component to each unit;

[0009] D. Analyze the contribution rate of a certain component to the sound transmission function of the entire vehicle through mathematical calculations.

[0010] Furthermore, in step A, the contribution rates of the sound transmission functions of the four paths of the front cabin, tire, exhaust port and rear cabin to the air sound transmission function of the whole vehicle are analyzed and recorded as α1, α2, α3 and α4 respectively; the α1, α2, α3 and α4 are obtained based on the statistics of the existing sound transmission function database.

[0011] Furthermore, in step B, the contribution rate of the sound transmission function of a certain path to the front enclosure unit, the front door unit, the rear door unit, the side enclosure unit, the front floor unit, the rear floor unit and the rear enclosure unit is obtained.

[0012] Furthermore, by simulating the path acoustic transmission function through VAone software, the energy flow method or the window method can be selected to obtain the contribution rate based on frequency changes.

[0013] Furthermore, in step C, the contribution rate of a certain unit to each component is obtained.

[0014] Furthermore, the noise reduction of the unit is simulated by VAone software, and the contribution rate based on the frequency change can be obtained.

[0015] Furthermore, the front enclosure unit includes three parts, namely, the front enclosure sheet metal, the front enclosure sound insulation pad, and the front enclosure baffle pad. The front door unit includes three parts, namely, the front door sheet metal, the front door glass, and the front door guard plate. The rear door unit includes three parts, namely, the rear door sheet metal, the rear door glass, and the rear door guard plate. The side enclosure unit includes three parts, namely, the side enclosure sheet metal, the side enclosure glass box and the side enclosure guard plate. The front floor unit includes four parts, namely, the front floor sheet metal, the carpet, the sound insulation pad inside the middle channel, and the sound insulation pad outside the middle channel. The rear floor unit includes five parts, namely, the rear floor sheet metal, the sound insulation pad under the rear seat, the sound insulation pad of the rear wheel cover, the sound insulation pad of the trunk, and the sound insulation pad under the floor. The roof unit includes five parts, namely, the front windshield, the roof sheet metal, the roof, the sunroof, and the rear windshield. The rear enclosure unit includes three parts, namely, the rear enclosure sheet metal, the trunk lid guard plate, and the rear enclosure guard plate.

[0016] Furthermore, in step D, when analyzing the contribution rate of a certain component to the sound transmission function of the entire vehicle, it is necessary to analyze the contribution rates of the four paths corresponding to the component and then sum them up.

[0017] Furthermore, the contribution rate of a certain component to the sound transmission function of the whole vehicle can be analyzed through mathematical calculations. The formula is as follows:

[0018] ATF=α1*ATF1+…+α k *ATF k

[0019] ATF k =ATF k1 +…+ATF ki

[0020] NR i =sr i1 +sr i2 +…+sr ij

[0021] β ki =ATF ki / ATF k

[0022] γ ij =sr ij / NR i

[0023]

[0024] Where ATF is the vehicle acoustic transmission function, ATF k is the k-path acoustic transmission function, ATF ki is the contribution of the k-path acoustic transmission function to the i-unit, NR i is the noise reduction of unit i, sr ij is the contribution of component j in unit i to the noise reduction, α k is the k-path acoustic transmission function contribution rate, obtained through database test data analysis, β ki is the contribution rate of the acoustic transmission function of the k-path i unit, γ ij is the contribution rate of noise reduction of each component, D ij is the contribution rate of the i-th unit and j-th component of the whole vehicle to the airborne sound transmission function, k is the k-th path of the sound transmission function, k=1┄4, i is the i-th unit of the whole vehicle, i=1┄8, j is the j-th component of a unit, j=1┄n.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention proposes a whole vehicle air sound transmission function contribution rate analysis method based on path analysis through database test data analysis and simulation analysis, so as to realize the whole vehicle air sound transmission function contribution rate analysis in the early stage of automobile research and development project, obtain the contribution rate of each component of acoustic package to the whole vehicle air sound transmission function, realize accurate control of automobile acoustic performance, and further realize performance optimization and cost reduction and weight reduction; the method is applied in the design stage of automobile research and development, and the components are changed before the layout position and space are locked, so as to reduce manpower and development costs, and can reduce costs and weight for components with low contribution rate, and optimize the design of components with high contribution rate to improve the acoustic performance of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 Analysis of vehicle airborne sound transmission path;

[0029] Figure 2 A flow chart of the steps of the vehicle airborne sound transmission function contribution rate analysis method based on path analysis of the present invention. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with embodiments:

[0031] The present invention uses simulation analysis to analyze the contribution rate of acoustic package components to the air sound transmission function of each path, and obtains the contribution rate of the air sound transmission function of each path to the sound transmission function of the whole vehicle through database test data analysis, thereby obtaining the contribution rate of the acoustic package components to the air sound transmission function of the whole vehicle.

[0032] Specifically, the contribution rate of a certain path sound transmission function to the front unit, front door unit, rear door unit, side unit, front floor unit, rear floor unit and rear unit is obtained. Specifically, the path sound transmission function can be obtained by simulating it with VAone software. The energy flow method or the window method can be selected to obtain the contribution rate based on frequency change. The contribution rate of a certain unit to each component is obtained. Specifically, the noise reduction amount of the unit is obtained by simulating it with VAone software, and the contribution rate based on frequency change can be obtained.

[0033] The vehicle airborne sound transmission function contribution rate analysis method based on path analysis of the present invention comprises the following steps:

[0034] 1. Use statistical methods to analyze the contribution of each path's acoustic transmission function to the vehicle's acoustic transmission function;

[0035] 2. Analyze the contribution rate of each unit to the acoustic transmission function of each path;

[0036] 3. Analyze the contribution rate of each component to each unit;

[0037] 4. Analyze the contribution rate of a certain component to the sound transmission function of the entire vehicle through mathematical calculations.

[0038] Specifically, the contribution rates of the sound transmission functions of the four paths of the front cabin, tire, exhaust port and rear cabin to the air sound transmission function of the whole vehicle are analyzed and recorded as: α1, α2, α3, α4 respectively.

[0039] The α1, α2, α3, and α4 are obtained based on statistics of the existing acoustic transmission function database.

[0040] Obtain the contribution rate of a certain path acoustic transmission function to the front enclosure unit, front door unit, rear door unit, side enclosure unit, front floor unit, rear floor unit and rear enclosure unit. Specifically, the path acoustic transmission function can be obtained by simulating it with VAone software. The energy flow method or the window method can be selected to obtain the contribution rate based on frequency changes.

[0041] Obtain the contribution rate of a certain unit to each component. Specifically, the noise reduction of the unit is simulated by VAone software, and the contribution rate based on frequency change can be obtained.

[0042] Among them, the front enclosure unit includes 3 parts, namely, the front enclosure sheet metal, the front enclosure sound insulation pad, and the front enclosure baffle pad. The front door unit includes 3 parts, namely, the front door sheet metal, the front door glass, and the front door guard plate. The rear door unit includes 3 parts, namely, the rear door sheet metal, the rear door glass, and the rear door guard plate. The side enclosure unit includes 3 parts, namely, the side enclosure sheet metal, the side enclosure glass box and the side enclosure guard plate. The front floor unit includes 4 parts, namely, the front floor sheet metal, the carpet, the sound insulation pad inside the middle channel, and the sound insulation pad outside the middle channel. The rear floor unit includes 5 parts, namely, the rear floor sheet metal, the sound insulation pad under the rear seat, the sound insulation pad of the rear wheel cover, the sound insulation pad of the trunk, and the sound insulation pad under the floor. The roof unit includes 5 parts, namely, the front windshield, the roof sheet metal, the roof, the sunroof, and the rear windshield. The rear enclosure unit includes 3 parts, namely, the rear enclosure sheet metal, the trunk lid guard plate, and the rear enclosure guard plate.

[0043] When analyzing the contribution rate of a certain component to the sound transmission function of the entire vehicle, it is necessary to analyze the contribution rates of the four paths corresponding to the component and then sum them up.

[0044] The contribution rate of a certain component to the sound transmission function of the whole vehicle is analyzed through mathematical calculations. The formula is as follows:

[0045] ATF=α1*ATF1+…+α k *ATF k

[0046] ATF k =ATF k1 +…+ATF ki

[0047] NR i =sr i1 +sr i2 +…+sr ij

[0048] β ki =ATF ki / ATF k

[0049] γ ij =sr ij / NR i

[0050]

[0051] Where ATF is the vehicle acoustic transmission function, ATF k is the k-path acoustic transmission function, ATF ki is the contribution of the k-path acoustic transmission function to the i-unit, NR i is the noise reduction of unit i, sr ij is the contribution of component j in unit i to the noise reduction, αk is the k-path acoustic transmission function contribution rate, obtained through database test data analysis, β ki is the contribution rate of the acoustic transmission function of the k-path i unit, γ ij is the contribution rate of noise reduction of each component, D ij is the contribution rate of the i-th unit and j-th component of the whole vehicle to the airborne sound transmission function, k is the k-th path of the sound transmission function, k=1┄4, i is the i-th unit of the whole vehicle, i=1┄8, j is the j-th component of a unit, j=1┄n.

[0052] Example 1

[0053] A method for analyzing the contribution rate of vehicle airborne sound transmission function based on path analysis comprises the following steps:

[0054] The contribution rates of the four paths, including the front cabin, tire, exhaust port, and rear cabin sound transmission function to the whole vehicle air sound transmission function (α1α2α3α4), are obtained by statistics based on the existing sound transmission function database, for example:

[0055] α1=0.3

[0056] α2=0.3

[0057] α3=0.25

[0058] α4=0.15

[0059] The contribution rate of a certain path sound transmission function to 8 units (front enclosure unit, front door unit, rear door unit, side enclosure unit, front floor unit, rear floor unit, and rear enclosure unit) is obtained by simulating the path sound transmission function with VAone software. The energy flow method or the window method can be selected to obtain the contribution rate based on frequency change. This patent abbreviates it as the mean value of the frequency segment. For example, the contribution rate of the 8 units in the front cabin ATF1 path is:

[0060] β 11 =0.4

[0061] β 12 =0.05

[0062] β 13 =0.025

[0063] β 14 =0.125

[0064] β 15 =0.3

[0065] β 16 =0.025

[0066] β 17 =0.05

[0067] β18 =0.025

[0068] The contribution rate of a certain unit to each component is obtained by simulating the noise reduction of the unit with VAone software. The contribution rate based on frequency change can be obtained. This patent abbreviates it as the mean value of the frequency band. For example, the contribution rate of each part of the front unit 3 (front panel, front sound insulation pad, front baffle pad) is:

[0069] γ 11 =0.5

[0070] γ 12 =0.1

[0071] γ 13 =0.4

[0072] Contribution rate of the dash panel pad to the front cabin sound transmission path: α1*β 11 *γ 13 =0.3*0.4*0.4=0.048.

[0073] In summary, to analyze the contribution rate of a certain component to the sound transmission function of the whole vehicle, it is necessary to analyze the contribution rates of the four paths corresponding to the component and then sum them up.

[0074] The contribution rate of a certain component to the sound transmission function of the whole vehicle is analyzed through mathematical calculations. The formula is as follows

[0075] ATF=α1*ATF1+…+α k *ATF k

[0076] ATF k =ATF k1 +…+ATF ki

[0077] NR i =sr i1 +sr i2 +…+sr ij

[0078] β ki =ATF ki / ATF k

[0079] γ ij =sr ij / NR i

[0080]

[0081] This method is applied in the design stage of automobile research and development. Components can be changed before the layout position and space are locked, reducing manpower and development costs. It can also reduce costs and weight for components with low contribution rates, and optimize the design of components with high contribution rates to improve the acoustic performance of the entire vehicle.

[0082] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A vehicle airborne sound transmission function contribution rate analysis method based on path analysis, characterized in that: The following steps are involved: A. Use statistical methods to analyze the contribution of each path's acoustic transmission function to the vehicle's acoustic transmission function; B. Analyze the contribution rate of each unit to the acoustic transmission function of each path; C. Analyze the contribution rate of each component to each unit; D. Analyze the contribution rate of a certain component to the sound transmission function of the entire vehicle through mathematical calculations.

2. The method for analyzing the contribution rate of vehicle airborne sound transmission function based on path analysis according to claim 1, characterized in that: Step A, analyzing the contribution rates of the four paths of the front cabin, tire, exhaust port and rear cabin to the whole vehicle airborne sound transmission function, which are recorded as α1, α2, α3 and α4 respectively; the α1, α2, α3 and α4 are obtained based on the statistics of the existing sound transmission function database.

3. The method for analyzing the contribution rate of vehicle airborne sound transmission function based on path analysis according to claim 1, characterized in that: Step B, obtaining the contribution rate of the sound transmission function of a certain path to the front unit, the front door unit, the rear door unit, the side unit, the front floor unit, the rear floor unit and the rear unit.

4. The method for analyzing the contribution rate of vehicle airborne sound transmission function based on path analysis according to claim 3 is characterized by: The path acoustic transmission function is obtained by simulating the path acoustic transmission function with VAone software. The energy flow method or the window method can be selected to obtain the contribution rate based on frequency changes.

5. The method for analyzing the contribution rate of vehicle airborne sound transmission function based on path analysis according to claim 1, characterized in that: Step C, obtaining the contribution rate of a certain unit to each component.

6. The method for analyzing the contribution rate of vehicle airborne sound transmission function based on path analysis according to claim 5, characterized in that: The noise reduction of the unit is simulated by VAone software, and the contribution rate based on frequency change can be obtained.

7. The method for analyzing the contribution rate of vehicle airborne sound transmission function based on path analysis according to claim 6, characterized in that: The front enclosure unit includes three parts, namely, the front enclosure sheet metal, the front enclosure sound insulation pad, and the front enclosure baffle pad. The front door unit includes three parts, namely, the front door sheet metal, the front door glass, and the front door guard plate. The rear door unit includes three parts, namely, the rear door sheet metal, the rear door glass, and the rear door guard plate. The side enclosure unit includes three parts, namely, the side enclosure sheet metal, the side enclosure glass box and the side enclosure guard plate. The front floor unit includes four parts, namely, the front floor sheet metal, the carpet, the sound insulation pad inside the middle channel, and the sound insulation pad outside the middle channel. The rear floor unit includes five parts, namely, the rear floor sheet metal, the sound insulation pad under the rear seat, the sound insulation pad of the rear wheel cover, the sound insulation pad of the trunk, and the sound insulation pad under the floor. The roof unit includes five parts, namely, the front windshield, the roof sheet metal, the roof, the sunroof, and the rear windshield. The rear enclosure unit includes three parts, namely, the rear enclosure sheet metal, the trunk lid guard plate, and the rear enclosure guard plate.

8. The method for analyzing the contribution rate of vehicle airborne sound transmission function based on path analysis according to claim 1, characterized in that: Step D, when analyzing the contribution rate of a certain component to the sound transmission function of the whole vehicle, it is necessary to analyze the contribution rates of the four paths corresponding to the component and then sum them up.

9. The method for analyzing the contribution rate of vehicle airborne sound transmission function based on path analysis according to claim 8, characterized in that: The contribution rate of a certain component to the sound transmission function of the whole vehicle is analyzed through mathematical calculations. The formula is as follows: ATF=α1*ATF1+…+α k *ATF k ATF k =ATF k1 +…+ATF ki NR i =sr i1 +sr i2 +…+sr ij β ki =ATF ki / ATF k γ ij =sr ij / NR i Where ATF is the vehicle acoustic transmission function, ATF k is the k-path acoustic transmission function, ATF ki is the contribution of the k-path acoustic transmission function to the i-unit, NR i is the noise reduction of unit i, sr ij is the contribution of component j in unit i to the noise reduction, α k is the k-path acoustic transmission function contribution rate, obtained through database test data analysis, β ki is the contribution rate of the acoustic transmission function of the k-path i unit, γ ij is the contribution rate of noise reduction of each component, D ij is the contribution rate of the i-th unit and j-th component of the whole vehicle to the airborne sound transmission function, k is the k-th path of the sound transmission function, k=1┄4, i is the i-th unit of the whole vehicle, i=1┄8, j is the j-th component of a unit, j=1┄n.

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