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Electrohydraulic effects on the modelling of a vehicle active suspension

Watton, John, Holford, Karen Margaret and Surawattanawan, P. 2001. Electrohydraulic effects on the modelling of a vehicle active suspension. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 215 (10) , pp. 1077-1092. 10.1243/0954407011528635

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Abstract

A car suspension incorporating a Lotus actuator and a TVR suspension/wheel unit is studied both experimentally and analytically. An emphasis is placed on hydraulic modelling using a series of transfer functions linking the hydraulic and suspension components. This is significantly aided by the use of a Moog 2000 programmable servo controller (PSC) to equalize the extending and retracting flow gains of the servovalve in the Lotus actuator control loop, justifying the use of combined extending and retracting transient data for parameter identification. This then allows the system equations to be developed using linear state-space theory, and a suitable form is proposed for further design studies. It is shown that the hydraulic components significantly contribute to the system dynamics and hence cannot be neglected when control schemes are formulated. In particular, the significance of hydraulic bulk modulus on dynamic performance is evaluated, and the importance of accurately determining all components of velocity-type damping is highlighted.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TJ Mechanical engineering and machinery
Uncontrolled Keywords: active suspension; modelling; electrohydraulic control
ISSN: 0954-4070
Last Modified: 01 Dec 2019 04:45
URI: http://orca.cf.ac.uk/id/eprint/2103

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