Abstract
This paper attempts to deal with the problem of machinery noise from the engineer's viewpoint and particular consideration is given to oil-engine noise. After a brief consideration of basic acoustical principles, an examination is made of commercial methods of noise measurement, illustrated by examples from various types of machinery. A suggested interpretation of these examples is then considered, from both the objective and subjective viewpoint, and an attempt is made to correlate diagrams obtained by measurement and known sources of engine noise. Methods of noise reduction are examined. Brief reference is made to the acoustic hood and the possibilities of its use in residential districts.
The paper is restricted to an examination of airborne noise. Vibration transmitted through the ground and its reappearance as noise away from the machinery is not considered.
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