Browse > Article
http://dx.doi.org/10.7776/ASK.2013.32.3.208

Responses and Stresses of Structural Vibration of a Camshaft  

Choi, Myung-Jin (Department of Mechanical Engineering, College of Engineering, Industrial Liaison Research Institute Kyung Hee University)
Publication Information
The Journal of the Acoustical Society of Korea / v.32, no.3, 2013 , pp. 208-213 More about this Journal
Abstract
To get vibration responses, a camshaft is modelled as an unbalanced multiple rotor bearing system. Because of complex geometry and complicated load conditions, the finite element method is used. After the finite element equation of the system is constructed, Newmark's method is used to get the vibration responses. Whirl vibration responses of a V-8 engine camshaft are estimated and compared with measured responses. After the fluctuating stresses are obtained, fatigue analysis is performed based upon the modified Goodman's equation. Stress concentration effects are considered. In the whirl vibration of camshafts, the bending effect is dominant, and the bending deformation is dependent upon the span length between the adjacent bearing journals. For high speeds, the fluctuations of excitation forces are large, and it is known that nonlinear time varying bearing coefficients should be used for analysis.
Keywords
Camshaft vibration; Rotor bearing system; Whirl vibration; Vibrational stress; Unbalanced vibration; Fluid film journal bearing;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 F. Freudenstein, M. Mayourian and E. R. Maki, "Energy efficient cam-follower systems," J. Mechan., Trans. Auto. Desig. (1983).
2 J. Kim, T. Moon and D. Han, "Analysis of camshaft vibration characteristics with mixed lubrication" (In Korean), J. KSAE 10, 34-43 (2002).   과학기술학회마을
3 H. D. Nelson, "A finite rotating shaft element using timoshenko beam theory," ASME Paper no. 79-WA/DE-5 (1979).
4 H. N. Ozguven and Z. L. Ozkan, "Whirl speeds and unbalance response of multibearing rotors using finite elements," ASME Paper no. 83-DET-89 (1983).
5 M. Choi, "Determination of natural frequencies of an engine crankshaft using finite elements"(in Korean), J. Acoust. Soc. Kr. 18, 20-25 (1999).   과학기술학회마을
6 J. W. Lund, Rotor-Bearing Dynamic Design Technology Part III: Design Handbook for Fluid Film Bearings, (Mechanical Technology Inc., New York, 1965).
7 J. S. Rao, Rotor Dynamics, (John Wiley & Sons, New Jersey, 1983).
8 J. M. Vanse, Rotordynamics of Turbomachinery, (John Wiley & Sons, New Jersey, 1988)
9 J. E. Shigley and L. D. Mitchell, Mechanical Engineering Design, (MaGraw-Hill Book Company, New York, 1983).
10 D. Kim, Dynamics and Optimal Design of High Speed Automotive Valve Trains, (Ph.D Dissertation, North Carolina State Univ. 1990).
11 M. P. Koster, Vibrations of Cam Mechanisms, Philips Tech. Lib. (The Macmillan Press Lid., New York, 1974).
12 M. P. Koster, "Effect of flexibility of driving shaft on dynamic behavior of a cam mechanism," ASME Paper No. 74-DET-48 and J. Eng. Ind. (1974).
13 F. Y. Chen, "A survey of the state of the art of cam system dynamics," Mechanisms. and Machine Theor.12, 201-224 (1977).   DOI   ScienceOn
14 B. Grant and A. H. Soni, "Cam design survey," Desig. Tech. Trans. 96, 177-219 (1974).
15 A. P. Pisano and F. Freudenstein, "An experimental and analytical investigation of the dynamic response of a high-speed cam-flower system," Part 1 and Part 2, Transac. ASME, J. Mechan., Trans. Auto. Desig. (1983).
16 M. Chew, F. Freudenstein and R. W. Longman, "Application of optimal control theory to the synthesis of high-speed cam-follower systems," Part 1 and Part 2, ASME Paper no. 82-DET-100 and 82-DET-101 (1982).