机电液系统动能刚度图示化在线识别技术

摘要

In order to measure the kinetic energy stiffness and evaluate the power matching nature between the power source and the load,a graphical recognition method of dynamic stiffness was put forward based on information fusion using Lissajous pattern.Based on the analysis result of system modeling,the energy-saving principle of the system, physical significance of kinetic energy stiffness and its influence mechanism for the mechanical electro-hydraulic system were analyzed.By using the signal modulation and information fusion technology,the signal of torque,speed,press and flow were fused as Lissajous pattern,and the change of graphic feature could identify the dynamic stiffness on line.The results show that the change of kinetic energy stiffness is the result of intercoupling between mechanical electro-hydraulic parameters,which can be used to measure the changing rate of kinetic energy and evaluate the energy-saving effect of the system.The inclination of Lissajous pattern can characterize the kinetic energy stiffness and the value can be used to evaluate the power matching nature between the power source and the load and monitor the on-line running state.%为在线检测机电液系统动能刚度，评价动力源与负载之间的功率匹配特性，提出利用李萨如图进行信息融合的动能刚度图示化识别方法。根据电机拖动液压系统的动力学模型，分析了系统的节能原理、动能刚度的物理意义及其对机电液系统功率的影响机理。再结合信号调制与信息融合技术，将系统的转矩、转速以及压力、流量信号融合成李萨如图形，通过检测图形特征的变化可以实现对系统动能刚度的在线识别。理论与实验研究结果表明：机电液系统动能刚度的变化是参数相互耦合的结果，可用于衡量动能变化率，评价系统的节能效果；融合的李萨如图形倾角可量化动能刚度大小，倾角变化反应了动能刚度的变化规律，由此得到的刚度圆能够评价系统动力源与负载之间的功率匹配性与在线运行状态。