NDLI: Eliminating the Unwanted Dynamics From the Controllable Suspensions for Vehicle Applications

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Song, Xubin Ahmadian, Mehdi Steve, C. Southward
Copyright Year	2002
Abstract	This paper presents two alternative implementations of skyhook control, named “skyhook function” and “no-jerk skyhook,” for reducing the dynamic jerk that is often experienced with conventional skyhook control in semiactive suspension systems. An analysis of the relationship between the absolute velocity of the sprung mass and the relative velocity across the suspension are used to show the damping force discontinuities that result from the conventional implementation of skyhook control. This analysis shows that at zero crossings of the relative velocity, conventional skyhook introduces a sharp increase (jump) in damping force, which, in turn, causes a jump in sprung mass acceleration. This acceleration jump, or jerk, causes a significant reduction in isolation benefits that can be offered by skyhook suspensions. The alternative implementations of skyhook control included in this study offer modifications to the formulation of conventional skyhook control such that the damping force jumps are eliminated. The alternative policies are compared with the conventional skyhook control, using a laboratory implementation on a heavy truck seat suspension that represents a base-excited system with a semiactive suspension. An evaluation of the damping force, seat acceleration, and the electrical currents supplied to a magneto-rheological (MR) damper that is used for this study, shows that the alternative implementations of skyhook control can entirely eliminate the damping force discontinuities and the resulting dynamic jerks caused by conventional skyhook control.
Sponsorship	Transportation
Starting Page	131
Ending Page	137
Page Count	7
File Format	PDF
ISBN	0791836568
DOI	10.1115/IMECE2002-32958
Volume Number	Transportation: Making Tracks for Tomorrow’s Transportation
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 Trucks Suspension systems Dampers Dynamics (mechanics) Rheology Electric current Vehicles
Content Type	Text
Resource Type	Article

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