Other Reports

Analysis of Optimum and Preview Control of Active Vehicle Suspensions

  • 01
  • Sep
  • 1967
AUTHOR: Erich K. Bender, Igor L. Paul
SUBJECT: Facilities & Test Equipment, Evaluation
KEYWORDS: Intelligent Transportation Systems, Motor Vehicles, Suspensions, Vehicle Dynamics, Vibration
ABSTRACT: The analysis leading to the optimum transfer function for an active suspension excited by a random guideway input is briefly reviewed and a design chart is presented. A parameter sensitivity study of the stability is performed and shows excellent system stability. The wheel-guideway contact problem is considered and a design chart is developed to check wheel-guideway relative displacement (wheel hop) for active suspensions. The equations for the rms force required to prevent wheel hop are derived and a design chart showing the minimum rms vehicle acceleration which can be obtained while applying this force is presented. The improved vibration isolation characteristics of active suspensions using preview control are investigated for infinite and finite preview distances. It is found that for a simple model infinite preview can reduce the rms vehicle acceleration by a factor of 16 and that a preview time of .4-.5 seconds is sufficient to provide almost the same improvement as infinite preview. It is concluded that active suspension development for vehicle heave, roll and pitch control, particularly for use with preview control, is warranted.