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Analysis and Reduction of Engine Front Noise Induced by the Vibration of the Crankshaft System
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English
Abstract
This paper describes the investigation of the mechanisms of engine front noise generation and the corresponding countermeasures employed in the development of Hino's medium duty diesel engine.
The engine front noise, which had a noise peak in the 630 Hz 1/3 octave band, was investigated by experiment and it was concluded that there were two mechanisms as follows:
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1)
Combustion pressure excites the crankshaft. Noise is generated by the crankshaft pulley which vibrates with the crankshaft system mode shapes.
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2)
The cavity between the torsional damper and the timing gear case resonates as a result of the vibration of the torsional damper. Noise caused by the acoustic resonance is emitted to the front of the engine.
Using both experimental and analytical methods, crankshaft vibration and acoustic resonance were reduced, thus yielding a substantial noise reduction.
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Maetani, Y., Niikura, T., Suzuki, S., Arai, S. et al., "Analysis and Reduction of Engine Front Noise Induced by the Vibration of the Crankshaft System," SAE Technical Paper 931336, 1993, https://doi.org/10.4271/931336.Also In
References
- Abe, T. Nakada, T. Reduction of Crankshaft Bending Vibration by Torsional Damper Pulley JSAE Proceedings 892151 1989
- Ochiai, K. Mori, F. The Influence of Standing Wave on Diesel Engine Noise Inter-Noise 82 Proceedings 1 1982
- Mutoh, H. Niikura, T. Yamamoto, A. Arakawa, M. Kikuchi, K. The Development of Low Noise Engine on Hino New “H” Series SAE-paper 900347 1990
- Ishiyama, S. Imai, M. Maruyama, S. Ido, H. Sugiura, N. Suzuki, S. The Applications of ACOUST/BOOM - A Noise Level Predicting and Reducing Computer Code SAE-paper 880910 1988