Can a Semi-Active Energy Harvesting Shock Absorber Mimic a Given Vehicle Passive Suspension?

Abstract

Energy harvesting shock absorbers (EHSA) have made great progress in recent years, although there are still no commercial solutions for this technology. This paper addresses the question of whether, and under what conditions, an EHSA can completely replace a conventional one. In this way, any conventional suspension could be replicated at will, while recovering part of the wasted energy. This paper focuses on mimicking the original passive damper behavior by continuously varying the electrical parameters of the regenerative damper. For this study, a typical ball-screw EHSA is chosen, and its equivalent suspension parameters are tried to be matched to the initial damper. The methodology proposes several electrical control circuits that optimize the dynamic behavior of the regenerative damper from the continuous variation of a load resistance. The results show that, given a target damper curve, the regenerative damper can adequately replicate it when there is a minimum velocity in the damper. However, when the damper velocity is close to zero, the only way to compensate for inertia is through the introduction of external energy to the system.

Study of an Energy-Harvesting Damper Based on Magnetic Interaction

“…Energy recovery through electromechanical systems is very promising because, in addition to allowing the recovery of part of the energy that would otherwise be dissipated, it allows the suspension to be converted into an active suspension, making it possible to change its operating characteristics electrically [ 23 ]. Damper-based energy-recovery systems have mostly been applied to cars, but it is also possible to find some design, development and implementation on motorbikes [ 24 ].…”