RECENT EXPERIMENTAL STUDIES OF MECHANICAL NOISE IN DIESEL ENGINES.
BOLT BERANEK AND NEWMAN INC CAMBRIDGE MASS
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The results of some recent British and Russian studies are found to indicate that rate of pressure rise, as well as piston-cylinder clearance and piston geometry, are of importance in relation to the mechanical noise and vibration of single-cylinder diesel engines. A dependence of noise on piston clearance and on offset of the piston pin is observedis observed even in engines in which combustion noise appears to be dominant. Also, the porting of oil through the piston wall is found to cause significant reductions in some parts of the noise spectrum.