Measuring method of ground reflection noise source

Abstract

The invention provides a simple and effective measuring method of a ground reflection noise source, which has low measuring cost. The measuring method comprises the following steps: A, supporting a finished automobile by hoisting equipment; B, stabilizing the operation working condition of the automobile at the state to be tested; C, horizontally placing a baffle board below an automobile body, wherein a gap between the baffle board and a chassis is same with a gap between a baseboard and the finished automobile when the finished automobile is naturally placed on the ground; translating the baffle board along the length direction of the automobile body; meanwhile, utilizing noise measuring equipment arranged in an automobile chamber to measure noise in the automobile chamber; according to the acoustic pressure level characteristic of attention noise in the automobile when the baffle board is on different positions, determining the main noise resource of noise reflected into the automobile by the baffle board. The measuring method of the ground reflection noise source of the invention can quickly measure the main noise resource of noise reflected into the automobile from ground by simple equipment. Compared with the traditional phonometry or acoustical holography method which is used for determining acoustic source, the measuring method of the invention has simple operation and low measuring cost.

Description

technical field [0001] The invention belongs to the technical field of automobile design, and in particular relates to a method for measuring ground reflection noise sources. Background technique [0002] The comfort of a car is one of the most important factors for consumers, and the noise inside the car is directly related to the NVH performance of the car and affects the comfort of passengers. As vehicle noise regulations become more stringent and customers have higher and higher requirements for vehicle noise, it has become an inevitable trend to reduce vehicle interior noise and improve sound quality. There are many sources of noise in the car, such as the engine compartment, tire noise, etc. In addition, the noise reflected from the ground to the car cannot be ignored, especially the mid- and low-frequency air noise reflected from the ground to the car during acceleration, which may cause car noise. The roaring sound in the room caused complaints from customers. Only...

AI Technical Summary

Problems solved by technology

There are many sources of noise in the car, such as engine compartment, tire noise, etc. In addition, the noise reflected from the ground to the car cannot be ignored, especially the low- and medium-frequency air noise reflected to the car interior through the ground during acceleration, which may cause car noise. The roaring sound in the room, which caused complaints from customers

Only by confirming the noise source in the car interior can we solve the noise problem in a targeted manner and improve the comfort level. Therefore, it is necessary to propose a measurement method to determine the main noise source of the noise reflected from the ground to the car interior. Acoustic holography can determine the source of noise, but the test facilities and equipment for the above method are very expensive, the test cost is high, and it is difficult to popularize

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