Performance analysis of semi-active suspensions with control of variable damping and stiffness

Abstract

2011) Performance analysis of semi-active suspensions with control of variable damping and stiffness, Vehicle System Dynamics: InternationalThe problem considered in this paper is the study and the control strategy design of semi-active suspensions, featuring the regulation of both damping and stiffness. The first contribution of this paper is the introduction and the analysis of two architectures based on the use of only controllable dampers, which make possible the emulation of an ideal suspension with controllable-damping-and-stiffness. This work presents an evaluation of the performances and drawbacks achieved by such suspension architectures, also in a nonlinear setting (explicitly taking into account the stroke limits of the suspension). This paper then proposes a new comfort-oriented variable-damping-and-stiffness control algorithm, named stroke-speed-threshold-stiffness-control, which overcomes the critical trade-off between the choice of the stiffness coefficient and the end-stop hitting. The use of a variable-dampingand-stiffness suspension, together with this algorithm, provides a significant improvement of the comfort performances, if compared with traditional passive suspensions and with more classical variable-damping semi-active suspensions.

A Compact Variable Stiffness and Damping Shock Absorber for Vehicle Suspension

“…The results showed that the variable stiffness and damping suspension performed best in isolating vibrations. Following their work, Spelta et al developed a novel control algorithm to control the variable stiffness and damping suspension in order to further improve the ride comfort of vehicles [23]. The simulation result demonstrated that the variable stiffness and damping suspension controlled by their control algorithm was more efficient in improving vibration isolation performance than the suspensions with only variable damping.…”

Development of a novel variable stiffness and damping magnetorheological fluid damper

“…The effectiveness of variable stiffness and damping on vibration reduction has been fully verified through simulation [20][21][22], however, a practical device that stiffness and damping are controllably simultaneously has been seldom developed.…”

“…The work reported by Spelta et al [20] and Xu et al [21] are the conceptual designs of variable stiffness and damping structure. Their simulation applied the variable stiffness and damping device on a vehicle suspension and the results verified that it is better at reducing vibrations than the suspension with only variable damping.…”

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