Browse Publications Technical Papers 2003-01-0580
2003-03-03

Self-Excited Vibration In Hydraulic Steering Racks 2003-01-0580

This paper addresses the problem of self-excited vibration in power steering racks -- an instability that results in a vibration that the driver can feel at the steering wheel.
A coupled mathematical model is used to express the interaction between the rack's opposed hydraulic actuators and the shimmy vibration of the steering mechanism.
It is found that
  • igh steering control valve gain causes an unstable self-excited vibration of the modeled system, and
  • The system's susceptibility to instability depends upon the position of the rack in its stroke.
Adjustments to the system parameters significantly reduce this instability.

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