Car body sound vibration roughness NVH design method based on low frequency acoustic sensitiveness inside vehicle

A design method and sensitivity technology, which is applied in the field of NVH design of vehicle body acoustic vibration roughness based on low-frequency interior acoustic sensitivity, and can solve problems that have yet to be studied in engineering practice

Active Publication Date: 2009-02-18
CHERY AUTOMOBILE CO LTD
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Problems solved by technology

This analysis has a mature theory in the field of academic research, but its application in engineering practice remains to be studied

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  • Car body sound vibration roughness NVH design method based on low frequency acoustic sensitiveness inside vehicle
  • Car body sound vibration roughness NVH design method based on low frequency acoustic sensitiveness inside vehicle
  • Car body sound vibration roughness NVH design method based on low frequency acoustic sensitiveness inside vehicle

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Embodiment Construction

[0034] figure 1 The acoustic sensitivity analysis flow is given. Firstly, the BIW finite element model is established, and the acoustic finite element model of the passenger compartment is established based on the BIW model; the frequency response analysis of the engine suspension points, suspension installation points, exhaust suspension points, etc. on the body is carried out; and then Using the vibration velocity of the body panel obtained from the frequency response analysis as a boundary condition, the acoustic response of the passenger compartment acoustic cavity is solved to obtain the sound pressure level next to the driver's ear; and then by checking the frequency response analysis results at the frequency point with a higher sound pressure response According to the vibration situation of the car body panel and the contribution of the sheet metal, the influence level and the installation point of the sheet metal parts that have a greater impact on the sound pressure l...

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Abstract

The invention relates to a method for designing the automobile body acoustic vibration unevenness NVH based on a low frequency automobile acoustic sensitivity. The method comprises the following steps: firstly, establishing a body-in-white finite element modeling, and establishing an acoustic finite element modeling for a cab on the basis of the body finite element modeling; secondly, carrying the frequency response analysis on the positions of a suspending point of an engine on the automobile body, a suspension mounting point, an exhaust hanging point, and the like; thirdly, taking the vibration speed of a body wall plate obtained by the frequency response analysis as a boundary condition, and the sound pressure level beside ears of a driver by solving the acoustic response of the cab; further, the influence level of larger sheet metal parts and mounting points which have great influence on the sound pressure level are acquired by checking the vibration situation of the body wall plate displayed by the frequency response analysis result at higher sound pressure response frequency points, and analyzing the sheet metal contribution; and finally, amending the design proposal of the sheet metal parts and the design proposal of the local rigidity of the mounting points.

Description

technical field [0001] The invention relates to a method for predicting the noise level inside a vehicle, in particular to a method for designing NVH of the vehicle body acoustic vibration roughness based on low-frequency vehicle interior acoustic sensitivity. Background technique [0002] The passenger compartment of a car is a typical elastic thin-wall cavity structure, and its inner wall is composed of frame structures such as columns and beams and thin plate structures such as floor and ceiling. Under the excitation of the powertrain and chassis components, the overall structural vibration generated by the frame structure such as columns and beams, the local vibration of the thin plate structure of the vehicle body, and the vibration of the cavity air in the vehicle interact with each other to produce coupling effects, resulting in annoying low-frequency booming noise. [0003] Acoustic sensitivity analysis, also known as sound pressure transfer function analysis, refer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D65/00G06F17/50
Inventor 田冠男杨晋李明江徐有忠
Owner CHERY AUTOMOBILE CO LTD
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