Title: Experimental identification of non-hysteresis algebraic force model of automotive hydraulic damper

Authors: Chandrashekhar S. Dharankar; Mahesh Kumar Hada; Sunil Chandel

Addresses: Department of Mechanical Engineering, AISSMS College of Engineering, Pune, 411001, India ' DRDO, HQRs, New Delhi, 11001, India ' Department of Mechanical Engineering, Defence Institute of Advanced Technology (DIAT), Pune, 411025, India

Abstract: A systematic methodology through grey box modelling is proposed for the nonlinear force characterisation of telescopic hydraulic dampers. The structure of force model is obtained through the theoretical analysis of damper operation based on principles of mechanics. A theory is developed to estimate the model parameters from experimental testing by using both sinusoidal and cyclic ramp excitation. The Coulomb friction and gas force components are obtained from quasi-static sinusoidal motion of damper and the components of velocity dependent damping force are obtained by using cyclic ramp excitation. The commercially available vehicle damper is used to demonstrate the proposed methodology for characterisation of damper force. The model parameters are obtained and the model is validated with experimental results to show its effectiveness. Being algebraic in nature and less parameters, it will be easy to implement in vehicle simulation.

Keywords: automotive hydraulic damper; shock absorber; damping force; damper force; coulomb friction; gas force; hysteresis; sinusoidal excitation; cyclic ramp excitation.

DOI: 10.1504/IJVP.2019.098999

International Journal of Vehicle Performance, 2019 Vol.5 No.2, pp.213 - 231

Received: 17 Oct 2017
Accepted: 25 Feb 2018
Published online: 12 Apr 2019 *

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