Device and method for testing automobile exhaust tail pipe noise

Abstract

The invention discloses a device and a method for testing automobile exhaust tail pipe noise. The device comprises an acoustic sensor and a data processor, and further comprises a temperature sensor, wherein the acoustic sensor is used for acquiring noise data of an exhaust tail pipe; the data processor is used for processing the noise data; and the temperature sensor is adjacent to the acoustic sensor, and is used for acquiring temperature data of a position where the acoustic sensor is positioned. When noise is tested, the temperature sensor can monitor the temperature condition at the acoustic sensor in real time synchronously. Compared with the structure that the device is adsorbed on a bumper by a sucking disc in the prior art, the structure that the device disclosed by the invention is arranged on the exhaust tail pipe is firmer and more reliable, so that the position of the acoustic sensor is kept unchanged relative to that of an exhaust tail pipe orifice, which is beneficial for improving the testing accuracy. The device is more suitable for testing bad working conditions such as acceleration running. The device can also adjust the distance and the angle between the acoustic sensor and the exhaust tail pipe orifice conveniently.

Description

technical field [0001] The invention relates to noise testing technology, more specifically, to a noise testing device and a testing method of an automobile exhaust tailpipe. Background technique [0002] At present, automobile noise is one of the main pollution sources of urban environmental noise. Among the many noise sources of automobiles, exhaust noise accounts for a large proportion. The test of automobile exhaust noise provides important data reference for the NVH (Noise, Vibration, Harshness) quality design of vehicles. NVH is one of the concerns of major vehicle manufacturers and parts companies in the international automotive industry. According to statistics, about 1 / 3 of the failure problems of the whole vehicle are related to the NVH problem of the vehicle, and nearly 20% of the research and development costs of major companies are spent on solving the NVH problem of the vehicle. Therefore, accurate testing of exhaust noise is an important issue to be solved ...

AI Technical Summary

Problems solved by technology

But these two devices have the following defects at least: (1) because these two devices are all absorbed on the bumper by the suction cup, the position of the microphone and the exhaust tailpipe cannot be kept fixed due to the vibration of the car running; The exhaust noise at different distances from the tail pipe is different, which will affect the accuracy of the test to a certain extent

And when testing harsh working conditions such as acceleration, the suction cup will fall off the bumper, making it impossible to complete the test

(2) The influence of temperature factors on test results is not considered

Due to the high exhaust temperature of the exhaust tailpipe, it will have a great impact on the performance of the noise measuring instrument

The inventor found that when the operating temperature of the acoustic sensor exceeds 80°C, the test data is inaccurate

The inaccuracy of the test will directly affect the evaluation or improvement based on the test results

(3) The position adjustment of the microphone is not flexible enough, and only one microphone is set, and only one set of data can be tested for each test. If test data at different positions are required, the test can only be done again, or more than one test can be installed in one test. test device, very inconvenient

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