摘要
随着航天领域的不断发展,航天器搭载的高精密仪器对振动环境的要求更加严格。本文针对航天器微振动的主动控制进行了分析。首先,根据隔振要求的不同,分别建立了单轴隔振器的扰动位移传递和干扰力传递的开环传递函数以及基于力反馈的闭环传递函数;然后,以扰动位移抑制为例通过理论推导分析了基于力反馈PI控制与线性自抗扰控制的主动隔振效果,并讨论了巴特沃斯滤波器对主动隔振系统的影响。最后,搭建了单轴主动隔振实验平台,验证了理论推导结果的正确性,LADRC控制可以在20~500 Hz全频带取得较好的隔振效果。微振动的衰减率在低频段达10 d B,在谐振频率和高频处达20 d B。
With the development of space technology,the high-precision instruments carried by spacecraft have higher requirements on the vibration environment.Active control of spacecraft micro-vibration was studied and analyzed.Firstly,according to the different vibration isolation requirements,the open-loop transfer function of disturbance displacement transmission and disturbance force transmission of single-axis vibration isolator and the closed-loop transfer function based on force feedback were established respectively.Then,the disturbance displacement suppression was taken as an example to theoretically derive.The active vibration isolation effect based on force feedback PI control and linear active disturbance rejection control was analyzed,and the influence of Butterworth filter on active vibration isolation system was discussed.Finally,a single-axis active vibration isolation experimental platform was built to verify the correctness of the theoretical derivation results.Linear active disturbance rejection control can achieve better vibration isolation effect in the full frequency range of 20~500 Hz.The attenuation rate of micro-vibration can reach 10 dB in the low frequency band and 20 dB in the resonant frequency and high frequency.
作者
李耀
吴洪涛
杨小龙
康升征
程世利
LI Yao;WU Hongtao;YANG Xiaolong;KANG Shengzheng;CHENG Shili(College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;School of Automotive Engineering,Yancheng Institute of Technology,Yancheng 224051,China)
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2018年第11期379-385,共7页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金项目(51375230
51405417)
关键词
振动主动控制
扰动位移传递
滤波器
线性自抗扰控制
active vibration control
disturbance displacement suppression
filter
linear active disturbance rejection control
作者简介
李耀(1989—),男,博士生,主要从事柔性并联机构及其隔振应用研究,E-mail:liyaokkx@nuaa.edu.cn;通信作者:吴洪涛(1962-),男,教授,博士生导师,主要从事多体系统动力学与并联机构研究,E-mail:mehtwu@126.com。
