某尾撑机构运动学与液压伺服系统静态特性分析

Kinematics and Static Characteristics Analysis of Hydraulic Servo System for the Rear Sting Support Mechanism of Wind Tunnel

某风洞尾撑机构通过迎角机构、前侧滑机构、后侧滑机构和Y向补偿机构的协调运动,实现模型迎角和侧滑角的连续调节和精确定位,是一个复杂的机电液系统。针对尾撑机构运动关系复杂、多液压轴精确联动的控制特点,通过运动学分析建立了机构的运动方程,为尾撑机构的精确控制提供依据;通过阀控缸伺服系统静态特性分析得到了阀控缸系统压力和流量的精确计算公式,为液压系统设计和元器件选型提供了依据;通过对某风洞尾撑机构进行计算分析,得到了尾撑机构不同运动情况下的液压缸速度曲线和阀控缸系统压力流量曲线,更加直观地表明了尾撑机构运动过程中各机构的协调运动关系和压力流量的变化趋势。

The rear sting support mechanism of wind tunnel is a complex hydromechatronic system,which achieves continuous adjustment and accurate positioning of attack angle and sideslip angle through the coordinate movement of the attack angle mechanism,the front sideslip angle mechanism,the back sideslip angle mechanism and the Y-direction compensation mechanism.In order to solve the complex motion relationship between each mechanism and the accurate control problem of multi-axis motion,the motion equations of the sting mechanism was built by using kinematics analysis,which provided basis for accurate control.The pressure and flow computational formulas of the valve-controlled-cylinder system were presented,which provided basis for hydraulic system design and components selection.The velocity curves of the cylinder and pressure-flow curves of the valve-controlled-cylinder system were shown,which intuitively indicated coordinate motion relationship between each mechanism and variation trend for pressure and flow of each servo valve.