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.
