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Piston “Stick Slip” Noise Generation Mechanism
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English
Abstract
An experimental approach was undertaken to investigate a low speed “diesel sounding” knock of an L-4, 1.6 litre, gasoline engine. Specific tests were devised to show the noise source to be associated with piston and ring friction. It was concluded that the noise was caused by a “stick-slip” action of the piston assembly as the piston reversed direction at the top and bottom of its’ stroke. The instantaneous change between static and dynamic coefficients of friction resulted in an abrupt force reaction, which excited the crankshaft’s natural frequencies. Design parameters were optimized to provide a 10 dB(A) (A-weighted sound level) reduction of noise at idle.
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Citation
Beardmore, J., "Piston “Stick Slip” Noise Generation Mechanism," SAE Technical Paper 820753, 1982, https://doi.org/10.4271/820753.Also In
References
- “Proceedings of the S.A.E. Diesel Engine Noise Conference” 26 February–02 March 1979
- “Proceedings of the S.A. E. Diesel Engine Noise Conference”, 08– 11 September 1975 SP-397
- “The Effect of Engine Structure on Noise of Diesel Engines” Pride, T. Austen, A. E. W. Grover; E. C. Proc. Inst. of Mech Engrs. 2964 5 179 No. 4
- “Vibrations of a Crankshaft” Hodgetts, D. Inst. of Mech. Engineers C99/71 23 March 1971
- “The Identification and Characterization of Rumble and Thud” Starkman E. S. Sytz; W. E. S.A.E. Transactions 68 1960
- “Simulating Piston Slap by an Analogue Computer” Haddad, S. D. “Journal of Sound and Vibration 52 1 1977
- “Affecting Diesel Engine Noise by the Piston” Rohrle; M. D. S.A.E. No. 750799 1975
- “Piston Movement and Its’ Influence on Noise of Automotive Engines” Sander, W. Steidle, W. Wacker; E. S.A.E. No. 790272 1979