Method for evaluating the sound insulation performance of vehicle body side cavity block

Abstract

The invention relates to a method for evaluating the sound insulation performance of a vehicle body side cavity block. The method comprises the following steps: 1) setting up a reverberation chamber and a full anechoic chamber, separated by a sound-absorbing cotton wall and creating a connection channel on the sound-absorbing cotton wall; 2) arranging inside the connection channel a square projection shaped cavity channel; 3) arranging a sound-absorbing baffle plate on the end face at one side of the connection channel near the reverberation chamber; embedding a to-be-tested block into the boss arranged in the cavity channel; 4) setting up a first measurement point inside the reverberation chamber and a second measurement point inside the cavity channel; and arranging sound-level meters at the first measuring point and the second measuring point respectively; 5) obtaining the SPL1 inside the reverberation chamber and the SPL2 of the connection channel after the connection channel passes the block through the sound level meters at the power measurement positions; and 6) utilizing the difference between the SPL1 inside the reverberation chamber and the SPL2 of the connection channel after the connection channel passes the block as the sound insulation performance grade evaluation value for the to-be-tested block. Compared with the prior art, the method of the invention can measure individually and is suitable for different shapes.

Description

technical field [0001] The invention relates to the field of testing the sound insulation performance of a cavity blocking block, in particular to an evaluation method for the sound insulation performance of a cavity blocking block around a vehicle body. Background technique [0002] The body side wall cavity barrier part can block the flow of air sound in the body side wall to a certain extent, thereby reducing the noise intruding from the outside of the car into the passenger compartment of the car, which plays an important role in reducing high-frequency noise inside the car. The cost of the barrier block is low, and it has become one of the important measures to suppress high-frequency noise in the car. [0003] In order to make the barrier block parts placed on the side wall of the vehicle body have a better noise reduction effect, not only the barrier block needs to be arranged in a better way on the side wall of the vehicle body, but also it is necessary to make the b...

AI Technical Summary

Problems solved by technology

The current mainstream SAE barrier material acoustic performance test standard J2846 is a measurement method for the sound insulation performance of acoustic materials. There is no way to stu

Images