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Noise Attenuation Characteristics of Exhaust Mufflers with Medium Size Farm Tractors

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Title Noise Attenuation Characteristics of Exhaust Mufflers with Medium Size Farm Tractors
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Creator M. Muthamil Selvanl and C. R. Mehta
 
Subject Noise Attenuation, Exhaust Mufflers, Tractor
 
Description Not Available
Three mufflers viz., muffler A, muffler B and muffler C were evaluated for their noise reduction ability on
two tractors of 23 kW pto power. The noise levels of the tractors were measured at operator's ear level at
no load under laboratory condition, at no load on tar road during transport mode and during ploughing
operation. The spectral analysis (one octave band) of noise levels was carried out in the frequency range
from 31.5 to 16000 Hz. The noise levels increased at no load (under laboratory condition and at no load on
tar road) at all the frequencies with the increase in engine speed. The highest noise level of the tractors at
rated engine speed was observed at the frequency of 1 kHz with muffler A, muffler B, and existing muffler;
and at 2 kHz with muffler C at no load under laboratory condition. The exhaust back-pressure increased
with increase in engine speed at no load under laboratory condition for all the mufflers. The mounting of
muffler B reduced noise levels by 4.1, 5.7 and 5.6 dB (A) on tractor-I and by 1.1, 1.4 and 4.0 dB(A) on
tractor-II at 1000, 2000 and 4000 Hz frequencies, respectively as compared to the existing mufflers. It may
be concluded that muffler B reduced noise levels considerably on both the tractors in conversational
frequencies
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Date 2021-08-30T09:35:42Z
2021-08-30T09:35:42Z
2008-10-01
 
Type Research Paper
 
Identifier 1
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http://krishi.icar.gov.in/jspui/handle/123456789/61006
 
Language English
 
Relation Not Available;
 
Publisher Not Available