摘要
磁流变胶(Magnetorheological Gel,MRG)与磁流变液(Magnetorheological Fluid,MRF)相比具有一定的抗沉降性和超长的稳定性。因此,MRG非常适用于像火炮等在和平时期长时间储藏后其各方面性能仍能满足作战要求的一类武器的反后坐应用中。为了深入研究MRG微观磁-力学特性对阻尼器宏观输出阻尼力学影响的机理,建立了库埃特(Couette)剪切流动和泊肃叶(Poiseuille)压力流动组成的混合流动模式的平行板模型;对阻尼器输出阻尼展开理论分析,最后利用MRG-70力学参数对阻尼器应用在火炮反后坐炮膛时期的可控性展开初步分析。分析结果表明:阻尼器的阻尼系数随MRG-70的动力黏度ηB、活塞有效工作截面积A P、磁极长度L以及Bingham系数Bi的增大而增大;而随阻尼通道y轴宽度d的二次方及屈服前柱塞流动y轴方向无量纲宽度δm增大而减小。磁流变阻尼器对火炮后坐炮膛时期具有可控性,且在能量输入非常小(0~131 mT)的情况下能达到较宽的可控范围。
MR Gel(MRG)has a certain anti settlement and long stability compared with MRF.Therefore,MRG is very suitable for recoil applications of a class of weapons,such as artillery,which can still meet the operation requirements after long time storage in peacetime.In order to study the influence of the mechanism of the micro magneto-mechanical properties of MRG on the damping mechanics of the macro-scopical output of the dampers,a parallel plate model for the mixed flow pattern of Couette shear flow and Poiseuille pressure flow was established.The theoretical analysis of the damper output damping was carried out.Finally,the controllability of the damper was analyzed by MRG-70 mechanical parameters.The results of the analysis shows that:the damping coefficient of the damper increases with dynamic viscosity,the effective working area of the piston,the length of the magnetic pole and the Bingham coefficient;in contrast,it decreases with the square of the width of the damped channel and the dimensionless width of the pre-yield plunger.MR damper was controllable to recoil at the beginning of the process of bore period,and the very small energy input(0-131 mT)can achieve a wide controllable range.
作者
张广
汪辉兴
王炅
ZHANG Guang;WANG Huixing;WANG Jiong(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2019年第20期172-180,187,共10页
Journal of Vibration and Shock
基金
国家自然科学基金(5167050237)
关键词
磁流变胶
反后坐
阻尼系数
混合流动
MR gel
reverse recoil
damping coefficient
mixed flow
