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It has been proven that the connecting rod transmits 70% of the energy that can be attributed to diesel engine noise radiation. So, an appropriate design considerably reduce noise levels. A leading utility vehicle manufacturer has shown interest in this technology. A training program in SEA is planned this year (see box).

Sound Intensity Measurements
The Sound and Vibration laboratory is also equipped with instrumentation for sound intensity measurement. This is done using a special probe which consists of two closely spaced microcan phones. For example, it has been used to identify noise sources on a gear box as shown in figure 2.

The advantages of these measurements are that they can be made in situ without the use of special facilities such as anechoic and reverberation rooms. Measurements can be made in the presence of moderate or high background noise. They can also be used to locate noise sources.

Providing a specific forum for informal meets has ensured continuous interaction between industries and the faculty of IIT Bombay working in the area of Vibration and Noise control. It commenced in 1993 as a “Breakfast Meeting Club”, and has now progressed into “Luncheon Meeting Club” on Vibration and Noise, which meets on second Saturdays of January and July. Representatives from leading industries in and around Mumbai participate in this bi-annual event; it is open to participation from all interested industry personnel.

(E-mail: dnm[at]me.iitb.ac.in)

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