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Proceedings Paper

Three different methods for the derivation of control laws for multi-degree-of-freedom systems containing electrorheological dampers
Author(s): Johannes Moosheimer; Heinz Waller
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Paper Abstract

The minimization of unwanted vibrations is an important technical challenge. Purely passive systems often do not achieve the postulated results. Purely active systems are costly because of the required additional power and the necessary maintenance. Currently it seems that semi-active methods of vibration reduction are as competitive as any other methods. Semi-active damping control can be realized with electro- or magnetorheological fluids. These change their characteristic in the presence of an electric or magnetic field or by bypasses combined with magnetic valves. The methods known in linear control theory cannot be used for the controller design because no explicit external forces can be generated whenever they are needed. Forces can only be generated when relative velocities between the endpoints of the damper exist. It is important to investigate control methods which will reduce vibration with controlled damping. In this paper three different methods for establishing control laws are presented. The first is based on the consideration of power flow in the system. It is discussed in detail. The second method uses Bellmans dynamic optimization. The last transforms a multi degree of freedom system by modal analysis into uncoupled single degree of freedom systems. The control methods developed by these three methods all lead to the same vibration reduction strategy. The control laws are verified with simulation results.

Paper Details

Date Published: 2 June 1999
PDF: 12 pages
Proc. SPIE 3672, Smart Structures and Materials 1999: Passive Damping and Isolation, (2 June 1999); doi: 10.1117/12.349796
Show Author Affiliations
Johannes Moosheimer, LuK GS Buehl (Germany)
Heinz Waller, Ruhr-Univ. Bochum (Germany)

Published in SPIE Proceedings Vol. 3672:
Smart Structures and Materials 1999: Passive Damping and Isolation
T. Tupper Hyde, Editor(s)

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