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Noise not predictable

1st May 1970, Page 61
1st May 1970
Page 61
Page 61, 1st May 1970 — Noise not predictable
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Which of the following most accurately describes the problem?

• Can the noise of a diesel engine be accurately predicted in the design stage? Apparently not, writes Paul Brockington after attending a group discussion on noise in London last week arranged by the Institution of Mechanical Engineers at which Dr-Ing Wolfgang Hempel. of the German Motor and Turbine Union, described the results of the CIMACsponsored world-wide survey of noise levels of four-stroke normally-aspirated and turbocharged diesels based on the speed and bore of the engines.

Commenting on Dr Hempel's review and other speakers' observations, Mr David Anderton. of the Institute of Sound and Research, Southampton University, said that a formula could only be a guide to the expected noise level of an engine.

Asked why the -old formulae" were not satisfactory, Dr Hempel said that they were evolved by Russian technicians and that Russian engines were "different".


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