某火炮磁流变缓冲阻尼器的设计与分析

针对火炮冲击型磁流变(MR)阻尼器的特点，基于Herschel-Bulkley本构模型，建立了某火炮实验研究用磁流变后坐缓冲阻尼器的平行板一维层流模型。在ANSYS软件中建立了阻尼器流口的电磁有限元模型，求得了平行板流口间磁流变流体（MR流体）的磁通密度。将MR流体流动模型和流口有限元结果相结合，获得了不同MR流体行为指数和不同磁场作用下阻尼力随活塞速度的变化规律。建立了火炮和磁流变缓冲阻尼器后坐运动方程，计算了不同MR流体行为指数下，火炮与磁流变阻尼器的动力学特性，评价了MR流体行为指数对磁流变阻尼器性能的影响。数值计算结果表明，所设计的磁流变阻尼器满足设计要求。

Design and Analysis of a Gun Recoil Magneto-Rheological Damper

A gun recoil magneto-rheological (MR) damper for a gun test application is studied m this paper. Iaking note of the shock characteristics of MR damper applied to gun recoil dynamics, a one-dimensional parallel-plate laminar flow model of the MR recoil damper was constructed based on Her- schel-Bulkley shear model. The finite element analysis of the magnetic field for a MR valve of the damper was done via ANSYS package, and the magnetic flux density of MR valve was obtained. Com?bining the MR fluid flow model and the FEM model of MR valve, the relation curves of damping force vs. piston velocity of the MR damper were obtained. Using the force-velocity characteristics of the MR damper, the recoil dynamic equation of 25 mm gun was solved, and the influence of MR fluid behavior index on the performance of MR recoil damper was evaluated. The simulation results indicate that the performance of this gun recoil damper satisfies the design requirements.