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Test method for noise outside automobile

A test method, the technology of automobiles, applied in the direction of vehicle testing, machine/structural component testing, measuring devices, etc., can solve the problems of no intake noise separation, inaccurate experimental results, and no consideration of temperature factors, etc., to eliminate Influence, the effect of improving accuracy

Active Publication Date: 2019-03-08
DONGFENG MOTOR CO LTD
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AI Technical Summary

Problems solved by technology

[0003] The separation method of automobile noise sources in the prior art does not consider the temperature factor, resulting in inaccurate experimental results
The method for separating automobile noise sources in the prior art does not separate the intake noise
The prior art methods for separating the noise sources of automobiles do not separate the noise of free rolling tires from the noise of traction torque tires
The above defects lead to the inability to accurately identify the main noise source during the analysis experiment of the cause of the noise outside the car, so that it is impossible to effectively specify the countermeasures

Method used

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Embodiment Construction

[0068] The specific implementation manner of the present invention will be further described below in conjunction with the accompanying drawings. Wherein the same components are denoted by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "inner" and "outer ” refer to directions towards or away from the geometric center of a particular part, respectively.

[0069] For the detailed regulations of "normal acceleration operation of automobiles" described below, please refer to "GB1495-2002 Limits and Measurement Methods of Exterior Noise of Accelerated Automobiles". The casing of the exhaust system described below is encapsulated, which means that the entire exhaust system is wrapped with high-temperature-resistant sound-absorbing materials and high-temperature-resistant sound-insulating materials to eliminate the radiated no...

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Abstract

The invention discloses a test method for noise outside an automobile. The method comprises free rolling tire test steps that A, air intake and exhaust ports of the automobile are silenced by mufflers, a casing of an exhaust system is sealed, original automobile tires are utilized by the automobile, the automobile is turned off, neutral taxiing operation is performed, through testing, the noise outside the automobile is Sa, the road surface temperature is Ta, free rolling tire noise S tire rolling=Sa+K(T0-Ta), wherein T0 is the reference temperature, and K is a tire noise temperature conversion coefficient. The method is advantaged in that influence of the road surface temperature on the calculation result can be eliminated, free rolling tire noise can be distinguished from traction torquetire noise, each main sound source of the noise outside the automobile can be identified to the greatest extent, and accuracy of the experimental result is improved.

Description

technical field [0001] The invention relates to the technical field of automobile noise separation, in particular to a method for testing exterior noise of automobiles. Background technique [0002] The sound sources of the noise outside the car are mainly engine noise, drive train noise, intake noise, exhaust port noise, exhaust radiation noise and tire noise. Among them, tire noise includes free rolling tire noise and traction torque tire noise. Free rolling tire noise refers to the noise generated when the tire is rolling freely, and traction torque tire noise refers to the noise generated when the tire is rolled by the torque of the engine. Traction torque tire noise should be mainly caused by the tread on the tire when it rubs against the ground. And the noise levels of tires are not the same at different temperatures. [0003] The automobile noise source separation method in the prior art does not consider the temperature factor, resulting in inaccurate experimental ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M17/007G01H17/00
CPCG01H17/00G01M17/007
Inventor 张健罗家庆文金辉
Owner DONGFENG MOTOR CO LTD
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