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CHAPTER 6<br />
6. DESIGN CALCULATION<br />
For the experiment, an existing petrol engine has been used. Calculation are done<br />
on the basis of data collected from the engine: however , some data on applicable<br />
to all engine. For designing, the following data required.<br />
1) SOUND CHARACTERISTICS (WITHOUT SILENCER)<br />
Obs no. Regulation Conventional<br />
silencer<br />
Aqua silencer<br />
Percentile<br />
reduction<br />
1 85dB 53dB 31dB 41.5%<br />
2 85dB 64dB 37dB 42.2%<br />
3 85dB 60dB 33dB 45%<br />
Table no<br />
Bar chart No.<br />
90<br />
80<br />
70<br />
60<br />
50<br />
40<br />
30<br />
Series1<br />
Series2<br />
Series3<br />
20<br />
10<br />
0<br />
Regulation<br />
Conventional<br />
silencer<br />
Aqua silencer
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