Background: The electro-hydraulic servo system has the advantages of high stiffness, fast response speed, high precision and power-to-weight ratio. Objective: In this patent, an adaptive robust control strategy based on friction compensation is proposed for insufficient control accuracy due to a large number of nonlinearities and uncertainties in the system. Methods: In this patent, the mathematical relationship between the physical quantities of the valve-controlled cylinder is analyzed. Then the mathematical model of valve controlled cylinder considering the main nonlinearity and uncertainty of the system is established. The fuzzy proportion-integral-derivative, deterministic robust, and adaptive robust single-cylinder trajectory tracking controllers are designed and the tracking performance of different reference trajectories is analyzed by MATLAB/Simulink software. Results: In this patent, all the three controllers can track the reference trajectories smoothly. Adaptive robust control strategy can make the uncertain parameters of system converge and approach truth value. Conclusion: In this patent, the adaptive robust control strategy has the function of online parameter adjustment. When tracking accuracy is taken as the index, its tracking effect is better than fuzzy proportion-integral-derivative and deterministic robust.

Cascade control strategy is applied to the position control of hydraulic servo system to improve the output response performance of the system. In order to suppress various uncertain nonlinear factors and external disturbances in the hydraulic servo system, cascade control strategy based on disturbance observer and nonlinear compensation is proposed, the global stability of position closed-loop system is ensured by the Lyapunov theory. Unlike the from a symptotically convergent controller, the cascade controller ensures that the system state error and observer estimation error converge to zero in a finite time. The designed controller is simulated and verified by MATLAB/Simulink, the results verify the theoretical feasibility of the proposed controller. In order to simulate unknown external interference, add damping adjustable shock absorber on the basis of hydraulic servo system to carry out experimental research. Experimental results show that the proposed controller can effectively suppress the influence of unknown disturbances, and improves the tracking accuracy of the hydraulic servo system.

为了探究轴配流液压脉冲发生器的内泄漏影响因素,利用Solidworks建立简化的间隙流场模型,通过ICEM进行网格划分,使用Fluent软件进行流体仿真,以开度、高压侧间隙高度、偏心量、入口压力作为变量,计算不同高压侧间隙下的周向、轴向的泄漏量并进行比较,得到了转阀内泄漏变化的规律.结果表明:高压侧间隙高度是影响内泄漏量的主要因素,且周向泄漏量大于轴向;低压工况下,各偏心量的内泄漏量基本不变,而高压时偏心量对内泄漏量有明显影响;开度对内泄漏量的影响取决于腔体窗口是否与阀芯高/低压侧连通,腔体窗口的通断使内泄漏量产生约0.5 L/min的突变,不利于保持内泄漏量的稳定;入口压力的升高总使内泄漏量增加,在同样的压力下,高压侧间隙高度或偏心量越大,内泄漏增量越大.

对于摆线液压马达的传统测试装置接线复杂、测试速度慢和不便于维护等缺点,基于S7-1200 PLC和LabVIEW软件开发平台,将测试技术与虚拟仪器技术相结合,开发了集数据采集与查询、TCP/IP通信、效率实验、生成Excel报表和数据存储等功能为一体的摆线马达性能测试系统.从测试系统总体设计、系统硬件设计和系统软件设计三方面进行详细的叙述.所开发的测试系统具有设备成本低、操作简便、便于维护和更新的优点.