电动负载模拟器的自适应模糊PI控制策略  

Adaptive Fuzzy PI Control for Electric Load Simulator

作　　者：贾东旭 刘梁[1] 徐照平[1] JIA Dongxu;LIU Liang;XU Zhaoping(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China)

机构地区：[1]南京理工大学机械工程学院,江苏南京210094

出　　处：《上海航天（中英文）》2021年第5期131-137,共7页Aerospace Shanghai（Chinese&English）

基　　金：国家自然科学基金(51975297,51875290);上海航天科技创新基金(SAST2018-107)。

摘　　要：针对电动负载模拟器中存在的多余力矩问题以及不确定性因素对系统性能的影响问题,设计了一种自适应模糊PI控制策略。首先,通过分析电动负载模拟器的组成及工作原理,得到了其数学模型,基于模型分析了多余力矩的产生原因以及系统中存在的不确定因素,分析了系统特性;其次,设计了力矩微分负反馈校正环节和自适应模糊PI控制器,并通过引入前馈补偿法,实现了对多余力矩进一步的抑制;然后,应用Matlab软件,仿真了所设计自适应模糊PI控制器的有效性,仿真结果表明该控制策略可将多余力矩抑制在99%以上,系统在8 Hz正弦力矩信号加载下的幅差小于10%,相差小于10°;最后,在搭建的实验平台上进行了验证,结果表明多余力矩抑制率能达到85%以上,且动态加载能满足“双十”指标。因此,该控制方法可有效抑制多余力矩,使系统具有良好的动态跟踪性能。In order to restrain the surplus torque in electric load simulator and reduce the influence of uncertain factors on the system performance,an adaptive fuzzy PI control strategy is designed.First,by analyzing the composition and working principle of electric load simulator,a mathematical model for electric load simulator is obtained.Based on the model,the causes of surplus torque and the uncertain factors in the system are analyzed,and the system characteristics are also analyzed.Second,the torque differential negative feedback correction link and the adaptive fuzzy PI controller are designed,and the feed-forward compensation is introduced to further restrain the surplus torque.Third,Matlab is used to simulate the effectiveness of the designed adaptive fuzzy PI controller.The simulation results show that the control strategy can restrain the surplus torque by more than 99%,the error of amplitude is less than 10%,and the error of phase is less than 10°when system is stimulated by 8 Hz sine signals.Finally,tests are carried out on the built test platform to verify the designed control strategy.The results show that the suppression rate of surplus torque can reach more than 85%,and the dynamic loading can meet the“double ten”index.Therefore,the control strategy can effectively suppress the excess torque and make the system have good dynamic tracking performance.

关 键 词：电动负载模拟器 多余力矩 力矩微分负反馈 模糊PI控制器 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]