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Engine mechanical noise testing method and device

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 problems such as large amount of calculation, high equipment requirements, and complicated calculation process, and achieve high precision and strong universal applicability Effect

Active Publication Date: 2021-06-25
JIANGSU UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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  • Engine mechanical noise testing method and device
  • Engine mechanical noise testing method and device
  • Engine mechanical noise testing method and device

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Embodiment Construction

[0043] The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, 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 lines. The sound intensity array 4 is facing the mechanical noise source to be tested on the engine, and...

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Abstract

The invention provides an engine mechanical noise testing method which overcomes the defect that mechanical noise testing is interfered by other noise sources in the prior art. A cylinder pressure sensor and a sound intensity probe are used for synchronously testing cylinder pressure and sound pressure signals of an engine, combustion noise components are separated from the sound pressure signals, mechanical noise components are obtained, and the sound intensity value of the mechanical noise is calculated according to the mechanical noise components in two microphones in the sound intensity probe. Compared with the prior art, the mechanical noise test device and method provided by the invention have the advantages that the precision of the measured mechanical noise is higher, 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 experimental technical field of automobile noise, vibration and harshness NVH (English abbreviation of Noise, Vibration and Harshness), 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. Because 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 drag the engine backwards, and then test its noise, and the measured result is considered to be the mec...

Claims

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Application Information

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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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