A smart passive MR damper with a hybrid powering system for impact mitigation: An experimental study

Abstract

This paper presents a smart passive MR damper with fast-responsive characteristics for impact mitigation. The hybrid powering system of the MR damper, composed of batteries and self-powering component, enables the damping of the MR damper to be negatively proportional to the impact velocity, which is called rate-dependent softening effect. This effect can keep the damping force as the maximum allowable constant force under different impact speed and thus improve the efficiency of the shock energy mitigation. The structure, prototype and working principle of the new MR damper are presented firstly. Then a vibration platform was used to characterize the dynamic property and the self-powering capability of the new MR damper. The impact mitigation performance of the new MR damper was evaluated using a drop hammer and compared with a passive damper. The comparison results demonstrate that the damping force generated by the new MR damper can be constant over a large range of impact velocity while the passive damper cannot. The special characteristics of the new MR damper can improve its energy dissipation efficiency over a wide range of impact speed and keep occupants and mechanical structures safe.

Safety Improvements for High-Speed Planing Craft Occupants: A Systematic Review

“…Other studies on shock-mitigation seats using drop-tower tests have been presented in [104][105][106]. Although Gunston et al [107] believed that this method might not accurately match high-impact and stochastic conditions, Marshall and Riley [96] conducted a comparative study between a shock-mitigation seat's performance in a laboratory drop test and real sea trials.…”

Application of hybrid control algorithm on the vehicle active suspension system to reduce vibrations

“…The magnetorheological damper uses electromagnetic force to regulate the flow of internally circulated liquid, thus making it possible to flexibly change the oscillation quenching process. 6,7 Active suspension systems should be used to mitigate oscillations more flexibly. [8][9][10] An active suspension system contains an extra hydraulic actuator that works based on the opening and closing of the servo valves.…”

Design and experimental study of a stepped magnetorheological damper with power generation

“…In response to the shortcomings of traditional magnetorheological dampers, scholars at home and abroad have conducted extensive research on self-powered magnetorheological dampers. Zhu et al (2020) designed a variable stiffness self-powered magnetorheological damper that has a variable stiffness range of 70.4% and can generate an effective power of 2.595 W. In order to improve the reliability of traditional magnetorheological dampers, Li et al (2021) proposed a new type of selfpowered magnetorheological damper that can provide a damping force of 1040 N. Jin et al (2021) proposed an intelligent magnetorheological damper with a hybrid energy supply system that has high energy dissipation efficiency. Wang et al (2022) designed a new self-powered magnetorheological damper which can greatly eliminate the negative impact of vertical vibration generated during the operation of electric vehicles.…”