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Sound Pressure Levels Generated by Internal Combustion Engine Exhaust Systems
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English
Abstract
A computer program has been developed which predicts the sound pressure level and the frequency spectrum produced by simple engine exhaust systems. The program utilizes unsteady flow gas dynamic theory to predict the pressure-time history in the exhaust system and the velocity-time history at the open end of the system. Acoustic theory is then used to predict the sound pressure levels and frequency spectrum in free space.
The work was carried out on a twin-cylinder four-cycle engine, but the theory can be applied to any internal combustion engine.
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Citation
Blair, G. and Spechko, J., "Sound Pressure Levels Generated by Internal Combustion Engine Exhaust Systems," SAE Technical Paper 720155, 1972, https://doi.org/10.4271/720155.Also In
References
- Blair G. P. Goulburn J. R. “An Unsteady Flow Analysis of Exhaust Systems for Multicylinder Automobile Engines.” SAE Transactions 78 1969 paper 690469
- Morse P. M. “Vibration and Sound.” New York McGraw-Hill Book Co., Inc. 1948
- Stewart G. W. “Acoustic Wave Filters.” Phys. Rev. 20 1922
- Davis D. D. Stokes G. M. Moore D. Stevens G. L. “Theoretical and Experimental Investigations of Mufflers with Comments on Exhaust Muffler Design.” NACA Report 1192 Washington D.C. 1955
- Davies P. O. A. L. “The Design of Silencers for I.C. Engines.” J. Sound Vib. 1 2 1964
- Blair G. P. Goulburn J. R. “The Pressure-Time History in the Exhaust System of a High-Speed Reciprocating Internal Combustion Engine.” SAE Transactions 76 paper 670477
- Blair G. P. Johnston M. B. “Unsteady Flow Effects in Exhaust Systems of Naturally Aspirated, Crankcase Compression, Two-Cycle Internal Combustion Engines.” SAE Transactions 77 1968 paper 680594