How to evaluate the performance of muffler

本主题由 tom.tong 于 2008-6-11 13:20 移动

ceshi

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1楼大中小发表于 2008-6-11 09:14 只看该作者

How to evaluate the performance of muffler

The performance of the muffler can be evaluated on the below three aspects:
A. Noise Elimination Performance is the noise reduction and spectrum characteristic of the muffler. Noise reduction of the muffler is generally expressed with sound transmission loss and insertion loss as well as end sound level difference at air outtake (or air intake) in field test. The spectrum characteristic of the muffler is generally expressed with noise reduction of octave band or 1/3 octave band.
B. Aerodynamic Performance is resistance loss or resistance coefficient. The resistance loss of the muffler is generally expressed with the full pressure difference between inlet and outlet of the muffler; the resistance coefficient can be worked out with dynamical pressure and resistance loss of the muffler. The aerodynamic performance of the equipment must be affected should the muffler is mounted on the air duct. If only the noise elimination performance of the muffler is concerned with the aerodynamic performance neglected, the efficiency of the equipment might be greatly reduced by the muffler or even the equipment does not work under some circumstances.
C. Structure Performance: For the mufflers with the same noise elimination performance and aerodynamic performance, the smaller in geometrical size, the cheaper in price, the longer in service life, the better.

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