NDLI: Safety and Comfort Analysis of Optimal Seats With Active and Semi-Active Suspension

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Bouazara, M. Richard, M. J. Rakheja, S.
Copyright Year	2002
Abstract	A generalized nonlinear model is formulated for dynamic analysis of suspension seats with passive, semi-active and active dampers. The model incorporates coulomb friction due to suspension linkages and bushings, forces arising from interactions with the elastic limit stops, a linear suspension spring and nonlinear damping force on the basis of passive, semi-active and active dampers, while the contribution due to biodynamics of the human operator is considered to be negligible. The semi-active and active dampers are charcterized by force generators in accordance with the control laws based upon suspension mass velocity. Two different suspension seats are experimentally assessed in the laboratory under sinusoidal and random excitations arising from an urban bus, and the measured data is used to demonstrate the validity of the proposed generalized model. The results showed reasonably good agreement between the model results and the measured data. Optimal model parameters are selected using the sequential unconstrained minimization technique with an objective to minimize the acceleration due to vibration transmitted to the occupant mass. The comfort and safety performance characteristics of the optimal suspension seat with semi-active and active dampers are evaluated under both the sinusoidal and random excitations on the basis of the guidelines provided in ISO-2631. From the results it is concluded that the comfort performance of a suspension seat with semi-active and active dampers can be considerably enhanced, in the 20% to 30% range.
Sponsorship	Design Engineering Division
Starting Page	87
Ending Page	92
Page Count	6
File Format	PDF
ISBN	0791836282
DOI	10.1115/IMECE2002-33196
Volume Number	Design Engineering
Conference Proceedings	ASME 2002 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2002-11-17
Publisher Place	New Orleans, Louisiana, USA
Access Restriction	Subscribed
Subject Keyword	Damping Linkages Vibration Dampers Random excitation Dynamic analysis Generators Performance characterization Friction Bushings Safety Cities Coulombs Springs
Content Type	Text
Resource Type	Article

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