This paper examines a double adjustable magnetorheological (MR) damper that can produce high damper force and substantial dynamic force range (the ratio of the field-on to the field-off damper force), particularly over a high speed piston range. To this end, a double adjustable MR damper is configured and its hydraulic model is theoretically constructed. From this hydraulic model, the governing equation for the double adjustable MR damper is derived using the nonlinear pressure-flow relationship. The damper characteristics of the double adjustable MR damper are theoretically evaluated and compared with those of a conventional flow-mode MR damper. To investigate the effectiveness of the double adjustable MR damper in mitigating shock of a gun recoil system, a mechanical model of the recoil system using a double adjustable MR damper is theoretically constructed and the dynamic equation for the recoil system is derived. The shock mitigation performance of the MR gun recoil system with no-field and constant magnetic field inputs is numerically evaluated. A simple on-off control algorithm is proposed to improve the shock mitigation performance of the passive MR gun recoil systems. Finally, the shock mitigation performance of the MR gun recoil system using no-field, constant field, and on-off control algorithm is analyzed and compared with those of a conventional gun recoil system under nominal firing forces, as well as a 30% perturbation from nominal.

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