[KSCI] Korea Science Citation Index Service

DYNAMIC ANALYSIS AND DESIGN CALCULATION METHODS FOR POWERTRAIN MOUNTING SYSTEMS

Shangguan, W.B. (College of Automotive Engineering, South China University of Technology)
Zhao, Y. (National CIMS Engineering Research Center, Tsinghua University)

Publication Information

International Journal of Automotive Technology / v.8, no.6, 2007 , pp. 731-744 More about this Journal

Abstract

A method for dynamic analysis and design calculation of a Powertrain Mounting System(PMS) including Hydraulic Engine Mounts(HEM) is developed with the aim of controlling powertrain motion and reducing low-frequency vibration in pitch and bounce modes. Here the pitch mode of the powertrain is defined as the mode rotating around the crankshaft of an engine for a transversely mounted powertrain. The powertrain is modeled as a rigid body connected to rigid ground by rubber mounts and/or HEMs. A mount is simplified as a three-dimensional spring with damping elements in its Local Coordinate System(LCS). The relation between force and displacement of each mount in its LCS is usually nonlinear and is simplified as piecewise linear in five ranges in this paper. An equation for estimating displacements of the powertrain center of gravity(C.G.) under static or quasi-static load is developed using Newton's second law, and an iterative algorithm is presented to calculate the displacements. Also an equation for analyzing the dynamic response of the powertrain under ground and engine shake excitations is derived using Newton's second law. Formulae for calculating reaction forces and displacements at each mount are presented. A generic PMS with four rubber mounts or two rubber mounts and two HEMs are used to validate the dynamic analysis and design calculation methods. Calculated displacements of the powertrain C.G. under static or quasi-static loads show that a powertrain motion can meet the displacement limits by properly selecting the stiffness and coordinates of the tuning points of each mount in its LCS using the calculation methods developed in this paper. Simulation results of the dynamic responses of a powertrain C.G. and the reaction forces at mounts demonstrate that resonance peaks can be reduced effectively with HEMs designed on the basis of the proposed methods.

Keywords

Automotive powertrain mounting systems; Hydraulic engine mounts; Motion and vibration control of a powertrain; Analysis and calculation methods;

Citations & Related Records

Times Cited By Web Of Science : 3 (Related Records In Web of Science)

Reference

1	Cho, S. (2000). Configuration and sizing optimization of powertrain mounting systems. Int. J. Vehicle Design 24, 1, 34−37
2	Demic, M. (1990). A contribution to the optimization of the position and the characteristics of a passenger car powertrain mounts. Int. J. Vehicle Design 11, 1, 87−99
3	Shangguan, W.-B. and Lu, Z.-H. (2004). Experimental study and simulation of a hydraulic engine mount with fully coupled fluid structure interaction finite element analysis model. Computers & Structures 82, 22, 1751−1771
4	Sirafi, M. and Qatu, M. (2003). Accurate modeling for powertrain and subframe models. SAE Paper No. 2003-01-1469
5	Vietor, T., Deges, R., and Hampl, N. (1997). Robust design of elastic mounting systems. SAE Paper No. 971933
6	Brach, R. M. (1997). Automotive powerplant isolation strategies. SAE Paper No. 971942
7	Ishihama, M., Seto, K., Nagamatsu, A. and Kazuhiro D. (1995). Control of engine roll and bounce vibration using hydraulic mounts. JSME Int. J. (Series C) 38, 1, 29−35
8	Zavala, P. A. G., Pinto, M. G., Pavanello, R. and Vaqueiro, J. (2000). Experimental and computational simulation approaches for engine mounting development and certification. SAE Paper No. 2000-01-3239
9	Snyman, J. A., Heuns, P. S. and Vermeulen, P. J. (1995). Vibration isolation of a mounted engine through optimization. Mechanism and Machine Theory 30, 1, 109−118
10	Suh, M. W., Shim, M. B., Kim, M. S. and Hong, S. K. (2003). Multidisciplinary design optimization of engine mounts with consideration of the driveline. Proc. Instn. Mech. Engrs, Part D, J. Automobile Engineering, 217, 107−113
11	Tao, J. S., Liu, G. R. and Lam, K. Y. (2000). Design optimization of marine engine mount system. J. Sound and Vibration 235, 3, 477−494
12	Swanson, D. A., Wu, H. T. and Ashrafiuon, H. (1993). Optimization of aircraft engine suspension systems. J. Aircraft 30, 6, 979−984
13	Haug, E. J. (1989). Computer Aided Kinematics and Dynamics of Mechanical Systems, I: Basic Methods. Allyn and Bacon. Needham Heights. MA
14	Zhang, Y.-Q. and Shangguan, W.-B. (2006). A novel approach for low-frequency performance design of hydraulic engine mounts. Computers & Structures 84, 7/8, 572−584
15	Yu, Y. H., Naganathan, N. G. and Dukkipati, R. V. (2001). A literature review of automotive engine mount systems. Mechanism and Machine Theory 36, 1, 123−142
16	Qatu, M., Sirafi, M. and Johns, F. (2002). Robustness of powertrain mount system for noise, vibration and harshness at idle. Proc. Instn. Mech. Engrs, Part D, J. Automobile Engineering, 216, 805−810
17	Geck, P. E. and Patton, R. D. (1984). Front wheel drive engine mount optimization. SAE Paper No. 840736
18	Johson, S. R. and Subhedar, J. W. (1979). Computer optimization of engine mounting systems. SAE Paper No. 790974
19	Bernard, J. E. and Starkey, J. M. (1983). Engine mount optimization. SAE Paper No. 830257