Magnetorheological semi-active shock mitigation control: Part II: System extension and application analysis

Abstract

In Part I of this work, the dynamic model of drop-induced shock mitigation based on magnetorheological (MR) energy absorber (EA) was deduced. The shock mitigation control effectiveness of constant force control method and optimal Bi number control method were compared based on Bingham model and resistor-capacitor (RC) operator-based hysteresis model. In this part, to further explore the possibility of the application of MREA in the shock mitigation control system, a single-degree-of-freedom (SDOF) shock mitigation control system is built with MREA connected in parallel with a coil spring, which is then connected in series with a vehicle tire to build a one-fourth vehicle suspension shock mitigation control system. Next, the constant force control method and optimal Bi number control method are extended to the SDOF shock mitigation control system. Based on the concept of the optimal Bi number, a two-degree-of-freedom (2DOF) optimal Bi number control method applied to the one-fourth vehicle suspension system is proposed by decoupling and recoupling the damping and stiffness of the vehicle suspension system. Using the control methods conducted in Part I, the motion state of the drop-induced shock mitigation process is simulated and analyzed. The control performances of the control methods in the SDOF shock mitigation control system are compared. Besides, the average velocity change rate (AVCR) and velocity-acceleration conversion ratio (V-ACR) are used to evaluate the effectiveness and stability of the control methods. Finally, the conclusion that the 2DOF optimal Bi number control method can effectively realize the shock mitigation control of a one-fourth vehicle suspension system is verified.

Adaptive magnetorheological fluid energy absorption systems: a review

“…The velocity-acceleration conversion ratio (V-ACR) and the average velocity change rate (AVCR) were also proposed as two evaluation indicators. Li et al (2023b) also proposed a two-degree-of-freedom (2DOF) optimal Bi number control method, which was applied to a shock mitigation control system of the 1/4 automobile suspension. As the research on the soft-landing control of the SDOF system is being continuously improved, the soft-landing control of systems, such as MREA-based gun recoil systems, aircraft landing gears, and planetary landers, will become one of the main directions in the research field of the MR impact mitigation control in the future.…”

Design, structure analysis and shock control of aircraft landing gear system with MR damper

“…Recent interest in overcoming the limitations of conventional landing gear including oleo struct has led to extensive research involving the utilization of MR (magnetorheological) dampers in aircraft landing gear systems [5][6][7][8][9][10]. In addition, the exploration of MR dampers as a means to improve shock mitigation performance under impact force conditions has gained significant attention in the field of smart materials and structures in recent years [11][12][13][14]. These innovative technologies may offer promising ways for improving flight stability and safety by dynamically adjusting to different landing conditions in aircraft.…”