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Noise not predictable
Page 61
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• 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".