Silencer test device based on airflow temperature and flow matching

A flow matching and testing device technology, applied in measurement devices, testing of mechanical parts, testing of machine/structural parts, etc., can solve the problems of increasing the production cycle cost of mufflers, lack of rigorous measurement methods for muffler insertion loss, etc., to achieve the best Effects of Noise Reduction Performance, Guaranteed Accuracy and Data Reliability

Active Publication Date: 2017-12-19
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The insertion loss of the muffler based on airflow temperature and flow matching lacks a rigorous measurement method, and the inaccuracy of the experimental measurement results will increase the production cycle cost of the muffler

Method used

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  • Silencer test device based on airflow temperature and flow matching
  • Silencer test device based on airflow temperature and flow matching
  • Silencer test device based on airflow temperature and flow matching

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Experimental program
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Embodiment Construction

[0024] The present invention is described in more detail below in conjunction with accompanying drawing:

[0025] Such as figure 1 with figure 2 As shown, the outlet of the kerosene test bench 1b is connected to the bellows 2, and the bellows 2 is connected to the second flow sensor 18 and the second temperature sensor 19 through the pipeline through the first sound insulation wall 17, and the second temperature sensor 19 is connected to the second temperature sensor 19 through the pipeline. The electroacoustic sources 6 are connected to form a first pipeline. The outlet of the diesel test bench 1a is connected to the bellows 2, and the bellows 2 is connected to the first flow sensor 3 and the first temperature sensor 4 through the pipeline through the first sound insulation wall 17, and the first temperature sensor 4 is connected to the mechanical sound source 5, Form the second pipeline. The diesel test bench 1a and the kerosene test bench 1b generate airflow with a cert...

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Abstract

The invention provides a silencer test device based on airflow temperature and flow matching, which belongs to the technical field of silencer test. A diesel test bench 1a and a kerosene test bench 1b are used as hot and cold gas sources. By adjusting the air flow and the oil ratio, the operating conditions of a silencer 10 at different temperatures and flows are simulated. A mechanical sound source 5 and an electro-acoustic source 6 are combined, and acoustic performance measuring is carried out on the silencer 10 in the frequency band range from 10 Hz to 20 kHz. According to the invention, the acoustic performance measurement and resistance performance measurement of the silencer are realized based on airflow temperature and flow matching; the test results are accurate; the measurement results have an important guiding significance for the structure optimization and noise reduction design of the silencer; and the silencer test device can be widely applied to the acoustic performance measurement and resistance performance measurement of a marine silencer and an automobile silencer.

Description

technical field [0001] The invention belongs to the technical field of muffler performance testing, in particular to a muffler testing device based on airflow temperature and flow matching. Background technique [0002] Noise control plays an extremely important role in the fields of automobiles and ships. The most effective way to control the aerodynamic noise generated by related devices is to install a muffler in the pipeline system. A muffler is a device that allows airflow to pass through while effectively reducing noise transmission in the duct. In the field test, the two most commonly used indicators in the performance analysis of the muffler are the acoustic performance index-insertion loss, and the resistance performance index-resistance loss. The insertion loss is defined as the sound power of the noise radiated from the nozzle before and after the muffler is installed. level difference. If the distribution of the ambient sound field remains approximately unchang...

Claims

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Application Information

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IPC IPC(8): G01M13/00
CPCG01M13/00
Inventor 张新玉张文平朱小松国杰
Owner HARBIN ENG UNIV
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