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By software calculating, we get the transmission loss value under each frequency,
and calculated the sound deadening capacity by A- weighted is 26.7dB.
Fig. 4.
Simulation of the transmission loss
under each frequency
Fig. 5.
Internal sound pressure nephogram of the
muffler under the 1000Hz
5 Conclusion
In this paper, we take the monolithic muffler applied on the train air-conditioning duct
as the study objection, and simulates numerically the monolithic muffler acoustic field
performance with the acoustic analysis software SYSNOISE, and do the experiment
test for verifying the correctness and rationality of the simulation. The main
conclusions are as follows: (1) the analysis result of the muffler by the software
SYSNOISE is consistent with the test result. It is feasible for simulating the acoustic
field characteristics of the monolithic muffler by the SYSNOISE. It provides a basis
for the study on the performance of the muffler. (2)The attenuation frequency of the
monolithic resistive muffler applied in the train duct is very wide and the attenuation
range is mainly the middle and high frequency sound wave. The attenuation effect is
obvious. (3)The sound-absorbing material of the monolithic resistive muffler applied in
the train duct play a very important role in the silencing effect of the muffler.
References
[1]
YouMa, D.: Noise and Vibration Control Engineering Manual. China Machine Press, 9
(2002)
[2]
Ma, J.: Reserch on the Properties of the Flow Field and Acoustic Field internal the
Muffler. Master Thesis of Jilin University (2005)
[3]
Shen, B.: Design of the Monolithic Muffler and Application in Environmental Noise
Control. Shantou University (1995)
[4]
Yu, Y.: Design of the Central air conditioning system. Southeast University Press (2007)
[5]
Du, G.: Basic of Acoustics. Nanjing University Press (2001)
[6]
Liu, B., Maeno, M., Hase, S., Wakamatsu, S.: A Study of a Dual Mode Muffler. SAE
paper 2003-0 1-1 647
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