RESEARCH PAPERS: Vehicular Vibrations

Improved Off-Road Tractor Ride via Passive Cab and Seat Suspensions

[+] Author and Article Information
S. Rakheja, S. Sankar

Department of Mechanical Engineering, Concordia University, Montreal, Canada

J. Vib., Acoust., Stress, and Reliab 106(2), 305-313 (Apr 01, 1984) (9 pages) doi:10.1115/1.3269186 History: Received June 20, 1983; Online November 23, 2009


Low frequency terrain-induced vibrations transmitted to off-road vehicle operators are quite severe and exceed ISO specified “fatigue-decreased-proficiency” (FDP) limits. Ride improvement of an agricultural tractor is investigated via passive suspensions at the seat and/or cab for their relatively simpler adaptability to an existing tractor construction. The investigation has been carried out in three phases, namely: seat suspension incorporating bounce, longitudinal, lateral, roll, and pitch modes on a rigidly mounted cab; cab suspension with a rigidly mounted seat; seat suspension in bounce, bounce-lateral, and bounce-roll, mounted on a suspended cab. Optimum suspension parameters in each phase of study are selected to maintain all translational acceleration PSDs at the operator’s location within 4 hours’ exposure-FDP limits, and to minimize roll and pitch acceleration PSD response. The relative displacement in each case is constrained to a selected minimum. Ride improvement achieved during each phase of investigation is compared to ISO-FDP acceleration PSD limits, and conclusions are drawn. Contribution of factors such as seat-location and cab-geometry to ride improvement is also presented.

Copyright © 1984 by ASME
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