A gun recoil system employing a magnetorheological fluid damper

Abstract

This research aims to design and control a full scale gun recoil buffering system which works under real firing impact loading conditions. A conventional gun recoil absorber is replaced with a controllable magnetorheological (MR) fluid damper. Through dynamic analysis of the gun recoil system, a theoretical model for optimal design and control of the MR fluid damper for impact loadings is derived. The optimal displacement, velocity and optimal design rules are obtained. By applying the optimal design theory to protect against impact loadings, an MR fluid damper for a full scale gun recoil system is designed and manufactured. An experimental study is carried out on a firing test rig which consists of a 30 mm caliber, multi-action automatic gun with an MR damper mounted to the fixed base through a sliding guide. Experimental buffering results under passive control and optimal control are obtained. By comparison, optimal control is better than passive control, because it produces smaller variation in the recoil force while achieving less displacement of the recoil body. The optimal control strategy presented in this paper is open-loop with no feedback system needed. This means that the control process is sensor-free. This is a great benefit for a buffering system under impact loading, especially for a gun recoil system which usually works in a harsh environment.

Transient multi-physics analysis of a magnetorheological shock absorber with the inverse Jiles–Atherton hysteresis model

“…Thus the apparent viscosity of the MR fluid shows decreasing trend with increasing temperature. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 [33,34]. However, due to external influences (humidity, temperature, burning rate, etc), the impact force becomes highly nonlinear and unstable, resulting in the difficulty of normalizing.…”

Magnetic Circuit Design and Multiphysics Analysis of a Novel MR Damper for Applications under High Velocity

“…Generally, MR fluid behaves like an ordinary Newtonian fluid, when exposed to a magnetic field, and the metal particles are guided by the magnetic field to form a chain-like structure and it becomes a grease state. MR fluid technology has been investigated in or applied to a variety of shock and vibration isolation systems, such as shock absorbers, clutches, polishing devices, actuators [2], hydraulic valves, gun recoil systems [3,4], railway vehicles [5,6], military suspension systems [7][8][9], and seismic isolation systems for civil infrastructures [10,11].…”

Magnetic Hysteresis Compensation Control of a Magnetorheological Damper

“…However, differential element can improve dynamic performance of the PID control system. As we know, the duration of the impact loading of the buffering system is short and always <0.1 s (Li and Wang, 2012). To verify whether the method of hysteresis compensation control can work well in a buffering system, four kinds of high frequency input signal is used for simulation.…”

“…But differential control needs to be used properly, otherwise the system will oscillate. In order to avoid oscillation, the value of differential coefficient K D is usually small (Li and Wang, 2012). The proportion coefficient, integral coefficient, and differential coefficient affect the control effect together.…”

“…x is the displacement of the mass. The ideal impact buffer effect is obtained when the damping force equals to constant (Li and Wang, 2012) as shown…”