Method and device for testing engine mechanical noise

A technology of mechanical noise and testing equipment, which is applied in vibration and acoustic roughness NVH experiments, and in the field of automobile noise, can solve the problems of high equipment requirements, large amount of calculation, complex calculation process, etc., and achieve strong universality and high precision. Effect

Active Publication Date: 2022-08-05
JIANGSU UNIV +1
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Problems solved by technology

Although this method can accurately test the mechanical noise of the engine to a certain extent, it still cannot eliminate other noise interference by using the sound pressure data of several points, and the calculation process is complicated, the calculation amount is large, and the equipment requirements are high.

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  • Method and device for testing engine mechanical noise
  • Method and device for testing engine mechanical noise
  • Method and device for testing engine mechanical noise

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Embodiment Construction

[0043] The realization, functional characteristics and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0044] refer to figure 1 In this preferred embodiment, the engine mechanical noise testing device includes an engine 1 , a crankshaft position sensor 2 , four cylinder pressure sensors 3 , a sound intensity array 4 , a signal acquisition system 5 and a computer 6 . The crankshaft position sensor 2 , the cylinder pressure sensor 3 and the sound intensity array 4 are all connected to the data acquisition system 5 through signal cables, and the data acquisition system 5 is connected to the computer 6 through signal cables. The sound intensity array 4 is facing the mechanical noise source to be measured on the engine, and the d...

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Abstract

The invention provides a method for testing the mechanical noise of an engine, which overcomes the disadvantage that the mechanical noise testing in the prior art is interfered by other noise sources. Using the cylinder pressure sensor and the sound intensity probe, the cylinder pressure and sound pressure signals of the engine are tested synchronously, and the combustion noise component is separated from the sound pressure signal to obtain the mechanical noise component. According to the mechanical noise in the two microphones in the sound intensity probe components, and calculate the sound intensity value of mechanical noise. Compared with the prior art, the mechanical noise test device and method proposed by the present invention can measure the mechanical noise with higher precision, and the result can indicate the direction for the optimization of the mechanical noise of the engine.

Description

technical field [0001] The invention belongs to the technical field of vehicle noise, vibration and NVH (abbreviation for Noise, Vibration, Harshness) experiments, and in particular relates to an engine mechanical noise testing device and method. Background technique [0002] Engine noise includes combustion noise and mechanical noise, among which mechanical noise is one of the most important noise sources on the engine, which has an important impact on the sound quality of the engine. Since the mechanical noise of the engine and the combustion noise are mixed together, when the microphone is used to directly test the signal of the mechanical noise source, it will be interfered by both the combustion noise and other nearby noise sources. [0003] In order to eliminate the influence of combustion noise, a dynamometer is often used in engineering to reverse the engine, and then test its noise and think that the measured result is the mechanical noise of the engine. However, i...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00G01M15/02G01M15/00
CPCG01H17/00G01M15/02G01M15/00
Inventor 樊士贡蔡忆昔李小华陈辉
Owner JIANGSU UNIV
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