双向压扭联轴器滞环颤振补偿技术研究

Dither Compensation Technology for Hysteresis of Bi-direction Thrust Torsion Coupling

提出一种针对2D电液比例方向阀的双向压扭联轴器的设计方案,用球型滚轮传递运动,将楔形件的直线运动转换为阀芯的旋转运动,同时放大输出转矩和2D阀芯的扭转角度。建立了压-扭联轴器的动力学方程,用相平面法研究了其颤振补偿间隙特性,采用颤振补偿技术降低压扭联轴器的滞环,达到消除间隙的效果。在建立数学模型和制作样机的基础上,对楔形件直线运动与阀杆旋转角度之间的关系进行了仿真和实验,仿真分析与实验结果基本吻合,实验结果表明:采用颤振补偿技术可有效降低因间隙产生的滞环;颤振幅值为间隙量50%时,滞环约为3.7%,颤振幅值大于间隙量时,滞环小于2%。

A novel design project of bi-direction thrust torsion coupling was put forward for 2D electrohydraulic proportional directional valve by using spherical roller,the wedge＇s linear motion could be translated into spool＇s rotary motion,and the output torque and 2D spool＇s torsion angle could be amplified. On the basis of the mathematical model,the dynamic characteristic of thrust torsion coupling and the hysteresis characteristics due to backlash were analyzed by using phase-plane analysis method.The backlash was overcome by using dither compensation technology and the effect for eliminating the backlash was achieved. Based on the mathematical model and the prototype,the relationship between linear motion of the wedge and rotation angular displacement of the spool was researched and simulated.Simulation and experimental results were consistent. Experimental results showed that the hysteresis of backlash could be reduced efficiently by using dither compensation technology,the hysteresis was about3. 7% as dither amplitude was half of backlash,and it could be controlled below 2%,as dither amplitude was beyond the backlash. Bi-direction thrust torsion coupling could be used in the 2D electrohydraulic proportional directional valve and the amplification of the displacement could be realized.