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Analytical Studies on Influence of Crankshaft Vibrations on Engine Noise Using Integrated Parametric Finite Element Model: Quick Assessment Tool
Technical Paper
1999-01-1769
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Torsional and lateral bending vibrations of cylinder block have a large effect on engine noise. Cylinder block vibration not only causes noise to radiate from the cylinder block itself but it is also the major exciting force to the oil pan and timing belt cover.
In order to reduce engine noise, it is important to completely understand the mechanism of cylinder block vibrations. An analysis is conducted using FEM and BEM to compute the influence of crankshaft torsional vibrations on cylinder block vibrations. A crankshaft system for a four cylinder automobile engine was used for analysis. Finite Element model of crankshaft is created using parametric modelling software developed based on ANSYS FEA software. Finite Element model of cylinder block, bearing cap, oil sump is also created using another parametric software developed based on ANSYS FEA software. Both the models are assembled and oil film is simulated at the journal bearings using spring-damper elements with appropriate values for stiffness and damping.
Dynamic analysis presented here focuses on the influence of crankshaft mode shapes on the excitation behaviour in the engine structure under crankshaft resonance conditions.
The influence of the mass and moments of inertia of the front pulley on crankshaft vibrations is studied. Results obtained so far match with the published data available on the subject experimentally. The paper focuses on the parametric tool developed for quick assessment of noise character of the combination of engine block, crankcase, oil sump and crankcase.
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Citation
Athavale, S. and Sajanpawar, P., "Analytical Studies on Influence of Crankshaft Vibrations on Engine Noise Using Integrated Parametric Finite Element Model: Quick Assessment Tool," SAE Technical Paper 1999-01-1769, 1999, https://doi.org/10.4271/1999-01-1769.Also In
References
- Ochiai Kazuomi Nakano Mitsuo “Relation between crankshaft torsional vibration and engine noise” SAE 790365
- Kubozuka Takao Hayashi Yoshimasa Hayakawa Yoshikazu Kikuchi Kazuhiro “Analytical study on engine noise caused by vibration of the cylinder block and crankshaft” SAE 830346
- Okamura Hideo Shinno Akio Yamanaka Tetsuo Suzuki Akio Sogabe Kiyoshi “A dynamic stiffness matrix approach to the analysis of three-dimensional vibrations of automobile engine crankshafts: Part 1 - Application to free vibrations”
- Morita Tetsuji Okamura Hideo “A dynamic stiffness matrix approach to the analysis of three-dimensional vibrations of automobile engine crankshafts: Part 2 - Application to firing conditions”
- Maetani Yasuhiro Nikura Takaaki Suzuki Shigeru Arai Susumu Okamura Hideo “Analysis and reduction of engine front noise induced by the vibration of the crankshaft system” SAE 931336
- Okamura Hideo Morita Tetsuji “Influence of crank-shaft-pulley dimensions on crankshaft vibrations and engine-structure noise and vibrations” SAE 931303
- Athavale Swati Sajanpawar P.R. “Finite element model generator for assessment and optimization of crankshaft design” SAE 912494