Measuring device for acoustic characteristics and flow characteristics of muffler in flow environment

Abstract

The invention relates to a measuring device for acoustic characteristics and flow characteristics of a muffler in a flow environment. The transmission loss and the pressure loss of the muffler in a flow field are measured. The device comprises a measurement environment generating module, a measurement variable generating module and a data acquisition analysis module. The tail end of the measurement environment generating module is connected with the muffler. The measurement environment generating module is used for generating noise and the flow field. The front end of the measurement variable generating module is connected with the muffler. The measurement variable generating module is used for changing the measurement environment to generate a measurement variable. The data acquisition analysis module is connected with the measurement environment generating module and the measurement variable generating module, and is used to acquire the pressure loss of the muffler in the flow field by acquiring and analyzing an air pressure signal, and acquire the transmission loss of the muffler in the flow field by acquiring and analyzing sound pressure signals under different measurement variables. Compared with the prior art, the measuring device provided by the invention can measure the acoustic characteristics of the muffler in the flow field environment, can simultaneously measure the transmission loss and the pressure loss, and has the advantages of high measurement efficiency, accurate measurement accuracy and the like.

Description

technical field [0001] The invention relates to the field of performance testing of sound-absorbing elements, in particular to a measuring device for acoustic characteristics and flow characteristics of sound-absorbing elements in a flow environment. Background technique [0002] With the improvement of the degree of industrialization, the influence of noise problems is increasing. As one of the most effective means of noise reduction, noise reduction components are widely used in the intake and exhaust of ventilation systems, fans, internal combustion engines, and air compressors. tube. There are high-speed flow fields in these pipelines (the average Mach number reaches above 0.2), which has a significant impact on the acoustic characteristics of the muffler components. Transmission loss and pressure loss are the most effective indicators to evaluate the acoustic characteristics and flow field characteristics of the muffler element respectively, and are important parameter...

AI Technical Summary

Problems solved by technology

At present, most of the bench designs at home and abroad are only suitable for the performance measurement of the anechoic element in the environment without a flow field, and can only measure the transmission loss or pressure loss of the anechoic element alone, and the results of both cannot be obtained at the same time

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