基于液压驱动的动态试验控制系统设计

介绍了应用液压驱动形式构建风洞动态试验控制系统的软硬件设计方法,包括液压马达、伺服阀的参数计算及选型,液压伺服位置控制系统设计方案,基于前馈控制和模糊比例-积分-微分(Proportion-Integration-Differentiation,PID)控制算法的设计思路,简谐运动的实现方法等。通过试验数据分析,该套系统在5°/2.5 Hz和40°/0.8 Hz以下的振幅/频率组合指标运动下,满足幅值差10%和相位差10°以内的控制指标要求,同时分析得到伺服阀死区特性是运动频率对指标造成影响的主要原因,并得出了基于液压驱动的动态试验系统较传统电机驱动系统的优缺点。

Control system design of dynamic test based on hydraulic drive

This paper introduces the design method of hardware and software for constructing the control system of wind tun-nel dynamic test by applying the hydraulic drive,including the hydraulic motor,the parameter calculation and selection of the servo valve,the control system design of the hydraulic servo position,the design idea based on feedforward control and fuzzy Proportion-Integration-Differentiation (PID)control algorithm,the implementation method of simple harmonic move-ment.Through the analysis of the test data,this control system meet the requirements of control index for the amplitude difference less than 10% and the phase difference within 10°,under the amplitude/frequency combination of 5°/2.5 Hz or 40°/0.8 Hz,meanwhile analyzing that the main reason for the influence of motion frequency on the index is the deadband characteristic of the servo valve,and concluding the advantages and disadvantages of the dynamic test system based on hy-draulic drive compared with the traditional motor drive system.