Research

My area of research is Vehicle Suspension Systems. The aim of my work is to try and understand better the constraints upon the acheivable behaviour of a suspension system from a very general viewpoint, making as few assumptions as possible about the form of the suspension unit. This work was motivated by an interest in active suspensions.

Recent Publications and Preprints

G.W. Walker
Constraints upon the Acheiveable Performance of Vehicle Suspension Systems.
Ph.D. Thesis. Abstract (Postscript file).

M.C. Smith and G.W. Walker
Performance Limitations for Active and Passive Suspensions.
Proceedings of the European Control Conference 1997. Abstract.

M.C. Smith and G.W. Walker
Performance limitations and constraints for active and passive suspensions: a mechanical multi-port approach.
Submitted to Vehicle System Dynamics, 1998. Abstract.

Other areas of interest include:

Achievable Dynamic Responses

Various analytic constraints upon transfer function can be found which allow us to determine exactly what can and cannot be acheived using a given active suspension system. Are there other constraints? Do these constraints conflict with our design goals?

Definition of an ideal response, both in frequency and time domains

Here we may consider a number of factors, including ride evaluation parameters such as Dynamic Tyre Load (handling), RMS suspension deflection (packaging) and RMS sprung mass acceleration (comfort).

This direction of research includes the more usual transfer function constraints approach, as well as a new direction of considering limitations arising from energy and power considerations.

Building realistic non-linear simulation model, and comparing these models with simplified models used in much of the analytical work in the literature.

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