Modelling of a semi-active hydropneumatic spring–damper unit
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Date
Authors
Theron, Nicolaas J.
Els, Pieter Schalk
Journal Title
Journal ISSN
Volume Title
Publisher
Inderscience
Abstract
The mathematical modelling of a suspension unit is considered.
The unit comprises a hydraulic cylinder connecting the vehicle body to the
unsprung mass, two nitrogen-filled accumulator springs and two damper ports.
The model takes the deflection rate as input and iteratively employs simple
fluid dynamics theory to calculate the flow-rates from each accumulator to the
cylinder. It calculates the pressure in the accumulators by time-integrating the
flow rates to determine the gas volumes and then invoking ideal gas theory.
This renders the dynamic force of the unit as output. Model predictions are
compared with measurements.
Description
Keywords
Semi-active suspension, Twin accumulator spring–damper, Vehicle dynamics, Off-road, Simulation, Model verification, Hydropneumatic spring damper, Mathematical modelling, Vehicle design, Vehicle suspensions, Deflection rate, Fluid dynamics, Ideal gas theory
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Citation
Theron, NJ & Els, PS 2007, 'Modelling of a semi-active hydropneumatic spring–damper unit', International Journal of Vehicle Design, vol. 45, no. 4, pp. 501-521.