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Idealization, Measurement and Calculation of an Engine Block
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English
Abstract
This paper describes static, dynamic, and acoustic finite element analyses of the engine block of a water-cooled 4-cylinder in-line engine, the results were later compared to measurements .
In order to locate the critical zones of the crankcase, a rather coarse general model was analyzed first, followed by detailed analyses of a number of subregions.
It was found that the results obtained from the idealized structure agreed quite well with static and dynamic measurements performed at the same time.
Static deformations found in the various zones yielded important information concerning the stiffness of the crankcase. By introducing a number of specific alterations it was possible to influence the stiffness of the crankcase, reduce stresses and decrease wear.
Dynamic analysis showed the prevailing natural frequencies as well as some information concerning those sections of the crankcase which are either suitable or unsuitable for attaching ancillary devices.
Further measurements were made to study the overall noise emission of the running engine, the dominant frequencies of sound, and the major causes of noise.
The acoustic behavior of a side wall of a crankcase together with some geometric variations was investigated by computing the sound intensity quotients.
Sound intensity measurements confirmed the results of these computations to a large extent.
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Citation
Birth, M. and Papez, S., "Idealization, Measurement and Calculation of an Engine Block," SAE Technical Paper 820438, 1982, https://doi.org/10.4271/820438.Also In
References
- Unistruc, Reference Manual
- MSC/Nastran, Users manual I/II
- Analytical Acoustics Strumpf F. B. 1980 ANN ARBOR SCIENCE PUBLISHERS
- Acoustic behaviour analysis of engine blocks Raibstein, A. J. Schering, W. P. Schulze SAE-Paper 790986
- Geräuscharme Maschinenteile Hefte 26, 36, 78; Forschungskuratorium Maschinenbau Frankfurt/M.
- Schalleitung-Untersuchungen über die Schalleitungen in komplexen Maschinen-strukturen, Forschungsvereinigung Ver-brennungskraftmaschinen Frankfurt/M
- Diesel Engine Sound Reduction by Dynamic Structural Modeling Moncelle, Michael E. SAE-Paper 800409
- Computer optimised Design of Engine Structures for Low Noise Lalor, N. SAE-Paper 790364
- An Experimental Passenger Car Diesel Engine Grover E. C. Perry, R. D. H. SAE-Paper 790443
- Engine Noise Due to Mechanical Impacts at Pistons and Bearings Lalor, N. Grover E. C. Priede, T. SAE-Paper 800402