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A high-precision double-row muffler transmission loss test device and test method

A technology of transmission loss and test method, applied in the field of acoustics, can solve problems such as difficult to achieve, and achieve the effect of eliminating test errors

Active Publication Date: 2018-11-13
AUTOMOBILE RES INST OF TSINGHUA UNIV IN SUZHOU XIANGCHENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For anechoic structures such as double-row outlets, when using the two-load method and the two-source method to test the transmission loss, it is also necessary to add a non-reflection boundary at the outlet of a downstream end. This is difficult to do in actual measurement, resulting in test errors

Method used

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  • A high-precision double-row muffler transmission loss test device and test method
  • A high-precision double-row muffler transmission loss test device and test method
  • A high-precision double-row muffler transmission loss test device and test method

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Embodiment Construction

[0035] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] see figure 1 The shown high-precision double-port muffler transmission loss test device includes a muffler 1 with double ports, and a first sound source generator 3 connected to the inlet end of the muffler 1 at the upstream end of the test device through an upstream test pipeline 2 , the second sound source generator 5 connected to one of the outlet ends of the muffler 1 through the first downstream test pipe 4 at the downstream end of the test device, and the other outlet end of the muffler 1 at the downstream end of the test device A third sound source generator 7 connected to the second downstream test tube 6, a test device for testing sound pressure.

[0037] Such as figure 2 As shown, the muffler 1 includes a muffler body 11, a first connecting flange 12 arranged at the inlet end of the muffler body 11...

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Abstract

The invention discloses a testing device and testing method of transmission loss of a high-precision double-discharge-opening silencer. The testing device comprises the silencer provided with double discharge openings, a first sound source generator connected with the inlet end of the silencer through an upstream testing pipeline, a second sound source generator connected with one discharge opening end of the silencer through a first downstream testing pipeline, and a third sound source generator connected with the other discharge opening end of the silencer through a second downstream testing pipeline, wherein at least two testing points used for testing sound pressure are arranged on each of the upstream testing pipeline, the first downstream testing pipeline and the second downstream testing pipeline in the pipeline length extension direction. According to the testing device and testing method provided by the invention, the testing error during the testing process of transmission loss of the silencer can be eliminated, or the testing error is enabled to be in a requested range.

Description

technical field [0001] The invention relates to the technical field of acoustics, in particular to a high-precision double-port muffler transmission loss test device and a test method. Background technique [0002] Transmission loss is the difference between the incident sound power level at the inlet of the muffler and the transmitted sound power level at the exit of the muffler. Transmission loss is an attribute of the muffler alone, and has nothing to do with the piping system and noise source. In the design stage of the muffler, the transmission loss is often used as an index to measure the muffler performance. The commonly used methods for the experimental measurement of the muffler transmission loss include the acoustic wave decomposition method, the two-load method, and the two-sound source method. [0003] The acoustic wave decomposition method is based on the principle of acoustic wave decomposition. The incident sound wave and the transmitted wave are decomposed b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/00G01N29/11
Inventor 柳仲达郑四发张琦余文杰
Owner AUTOMOBILE RES INST OF TSINGHUA UNIV IN SUZHOU XIANGCHENG