Method and device for predicting sound insulation performance of automobile metal plate part assembly with plug

Abstract

The invention discloses a method and device for predicting the sound insulation performance of an automobile metal plate part assembly with a plug. According to the method and device, the sound insulation performance of a perforated plate part with no to-be-tested plugs and the sound insulation performance of a perforated plate part with a to-be-tested plug are detected and calculated, so that thesound transmission loss of the to-be-tested plug can be obtained; the sound transmission loss of a non-perforated plate part is detected, so that the sound transmission loss of the non-perforated plate part is obtained; the sound transmission loss of a to-be-predicted metal plate part assembly is calculated according to the sound transmission loss of the to-be-tested plug and the sound transmission loss of the non-perforated plate part; and thus, the sound insulation performance of the metal plate part assembly is rapidly and accurately predicted, and the problems of high cost and long perioddue to the fact that a metal plate part assembly is mounted can be solved, and efficiency is improved.

Description

technical field [0001] The invention belongs to the field of sound insulation and NVH performance of an automobile sheet metal assembly, and in particular relates to a sound insulation performance prediction method and a prediction device of an automobile sheet metal assembly with a blocking piece. Background technique [0002] With the development of the automobile industry, the noise level inside the car has gradually become an important factor affecting people's evaluation and purchase of cars. How to reduce the noise inside the car has become a difficult problem for NVH researchers. A large number of openings will be produced in the manufacturing and assembly process of the automobile body, and most of these openings are sealed by means of blocking parts (such as patches, blocking covers, etc.), and the sound insulation performance of these blocking parts has become a factor that affects the entire vehicle. A key factor in sound insulation. However, the sound insulation...

AI Technical Summary

Problems solved by technology

[0003] At present, various car companies mainly rely on the sound insulation wall between the reverberation chamber and the anechoic chamber to test the sound insulation performance of the sheet metal component assembly. On the sound insulation wall between the rooms (that is, the "upper wall"), the sound insulation performance of the sheet metal component assembly is tested using the sound intensity and sound pressure method; and using this method requires the production of special assembly tooling and assembly fixtures. And cutting the assembly tooling and installing it on the wall, the cost is high, the cycle is long, and it is not convenient for large-scale use

Images