径向流磁流变阀控缸系统动力性能研究

为进一步扩大磁流变阀的工业应用,提出并设计了一种径向流磁流变阀控缸系统,主要由径向流磁流变阀、单出杆液压缸及蓄能器3部分构成。阐述了径向流磁流变阀控缸系统的工作原理,推导了阻尼力数学模型。对径向流阀控缸系统进行了动力性能建模仿真,并搭建了动力性能测试实验台,分别对常规型与改进型径向流磁流变阀控缸系统在不同电流、不同频率及不同振幅下的动力性能进行了实验,实验结果表明,以径向流磁流变阀作为旁通控制元件的磁流变阀控缸系统能够产生较大的输出阻尼力,阻尼力最大可达5.8 k N;另外,阻尼力随电流变化顺逆可调,且可调范围广;同时,输出阻尼力受活塞杆运动速度影响很小,阀控缸系统能在各种工况输出稳定阻尼力。对比分析2个磁流变阀控缸系统可知,更换不同的磁流变阀可得到不同的动力性能。

Dynamic Characteristics Analysis of Radial Flow MR Valve Controlled Cylinder System

Magnetorheological valve (MR) is a typical smart control mechanism that using magnetorheologcial fluid as the working fluid. The advantages of simple operation, fast response, and regulating pressure drop make the MR valve have a promising application prospects in the hydraulic system. In order to broaden the industrial applications of MR valve, a radial flow MR valve controlled cylinder system was proposed, which consisted of a radial flow MR valve, a single rod hydraulic cylinder and an accumulator. The working principle of radial flow MR valve controlled cylinder system was described in detail. The mathematical model of damping force was deduced, and the simulation analysis was also carried out. At the same time, the dynamic test rig was set up to investigate the dynamic performances of the typical and improved radial flow MR valve controlled cylinder systems under different currents, frequencies, and amplitudes. The experimental results showed that radial flow MR valve controlled cylinder system can output a large damping force, and the maximum damping force can reach 5.8kN. Furthermore, the damping force can be continuously adjusted under different applied currents, and the adjustable range was wide. The effect of piston velocity on the damping force was little, and the system can output stable damping forces under a variety of operating conditions. The comparative analysis of two different valve controlled cylinder systems also showed that different dynamic performance can be obtained by replacing different MR valves.