Ride Simulation of Passive, Active, and Semi-Active Seat Suspensions for Off-Road Vehicles
Kim, Kyeong Uk
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https://hdl.handle.net/2142/67834
Description
Title
Ride Simulation of Passive, Active, and Semi-Active Seat Suspensions for Off-Road Vehicles
Author(s)
Kim, Kyeong Uk
Issue Date
1981
Department of Study
Agricultural Engineering
Discipline
Agricultural Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Agricultural
Language
eng
Abstract
Mathematical models were developed for passive, active, and semi-active suspension systems for off-road vehicle seat suspensions. Each suspension model was combined with a three degree of freedom model of the vehicle operator to formulate models of the ride systems of off-road vehicles. Ride performance of the suspension systems were computer simulated using the ride models at the various natural frequencies and damping ratios of their suspension systems.
The input vibrations for simulation of the ride models were obtained by measuring a real time history of acceleration data at the base of the seat suspension of agricultural tractors during the transport and moldboard plowing operations. The output vibrations from the model simulation were presented in terms of the ISO frequency weighted root mean square accelerations of the operator's head, body, and pelvis at the preferred third octave frequency bands. The acceleration levels were evaluated in the criteria of the ISO 8 hour fatigue-decreased proficiency boundary. Absorbed power of the operator was also computed for assessing relative ride performance of the suspension systems.
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