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ANALYTICAL METHODS AND DESIGN IMPLICATIONS OF DETERMINISTIC RIDE QUALITY CRITERIA

J. Karl Hedrick, Rcj White, H Firouztash

Abstract

An alternative ride quality standard that involves the instantaneous values of acceleration and rate of change of acceleration (jerk) in all six degrees of freedom is proposed. The report develops an analytical form for the standard and discusses a twelve-dimensional 'comfort' ellipsoid along with possible maximum values for each axis. These values are obtained from a review of available data on human response to levels of acceleration and jerk. An analytical design approach, using such a deterministic standard, is developed employing linear system theory. The method developed allows the designer to design the vehicle's suspension system and/or to bound the allowable range of guideway disturbances so that the ride quality standard is satisfied. A rigorous development of the method is presented along with examples to illustrate its usage.

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Available abstract

Key concepts: Jerk, Acceleration, Ride quality, Range (aeronautics), Quality (philosophy), Ellipsoid, Control theory (sociology), Suspension (topology)