附加连接对主动指向超静平台控制效果的影响

doi:10.7527/S1000-6893.2021.25864

Abstract

Abstract:

Ultrahigh precision ultrahigh stability ultra-agile multi-stage satellites are implemented by introducing a two-stage control ultra-Agile ultra-Stable and ultra-Pointing platform （ASP） to the spacecraft platform. The ASP isolates the vibration and enables rapid maneuver ability of payloads. Additional connection may degrade the pointing accuracy and capability of vibration isolation； therefore， numerical simulation and an experiment examining the control performance of the ASP system with cable and heat pipe additional connection are conducted. The Newton-Euler method is used to establish a multi-stage dynamic system. A mechanical model laying the foundation for effect analysis of the cable and heat pipe additional connection on the system is established. Numerical simulation is implemented to analyze the effect of additional connection on vibration isolation and stability of the system， providing theoretical support for satellite design and test. To gain more precise understanding of the effect of the additional connection， a full physical experiment is designed and conducted on the ASP control system. The result shows that the assembly layout of the cable and heat pipe additional connection has little effect on stability， pointing accuracy and setting time of the ASP control system. The assembly layout of the cable and heat pipe in the experiment provides a significant reference value and practical meaning for satellite design. An adaptive nonlinear control law with prescribed performance is proposed for dynamic coupling between the payload and platform. The simulation result shows that the controller considerably reduces the dynamic coupling and further improves the ability of fast maneuver， stable tracking and high precision pointing.

Key words: cable and heat pipe connection, vibration isolation, pointing stability, pointing accuracy, ultra-agile ultra-stable and ultra-pointing platform

CLC Number:

V448.2

Mao FAN, Liang TANG, Xin GUAN, Kebei ZHANG. Ultra-agile ultra-stable and ultra-pointing platform with additional connection[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023, 44(11): 225864-225864.

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References 29

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参数	X_p=1 m	Y_p=1 m	Z_p=1 m	R_x_p=1 rad	R_y_p=1 rad	R_z_p=1 rad
F_x_p/N	18 267	0	0	0	-3 240	0
F_y_p/N	0	18 267	0	3 240	0	0
F_z_p/N	0	0	35 467	0	0	0
T_x_p/（N·m）	0	3 240	0	7 838	0	0
T_y_p/（N·m）	-3 240	0	0	0	7 838	0
T_z_p/（N·m）	0	0	0	0	0	14 964

参数	X_p=1 m	Y_p=1 m	Z_p=1 m	R_x_p=1 rad	R_y_p=1 rad	R_z_p=1 rad
F_x_p/N	-18 267	0	0	0	-6 083	0
F_y_p/N	0	-18 267	0	6 083	0	0
F_z_p/N	0	0	-35 467	0	0	0
T_x_p/（N·m）	0	-3 240	0	-6 184	0	0
T_y_p/（N·m）	3 240	0	0	0	-6 184	0
T_z_p/（N·m）	0	0	0	0	0	-14 964

参数	X_p=1 m	Y_p=1 m	Z_p=1 m	R_x_p=1 rad	R_y_p=1 rad	R_z_p=1 rad
F_x_p/N	674	-87	-243	-154	77	-113
F_y_p/N	-87	775	421	100	154	-65
F_z_p/N	-243	421	3 351	269	155	0
T_x_p/（N·m）	-154	100	269	925	-115	143
T_y_p/（N·m）	77	154	155	-115	1 057	-247
T_z_p/（N·m）	-113	-65	0	142	-247	857

参数	X_p=1 m	Y_p=1 m	Z_p=1 m	R_x_p=1 rad	R_y_p=1 rad	R_z_p=1 rad
F_x_p/N	-674	87	243	109	-421	113
F_y_p/N	87	-775	-421	295	-109	65
F_z_p/N	243	-421	-3 351	-54	-31	0
T_x_p/（N·m）	154	-100	-269	-874	193	-143
T_y_p/（N·m）	-77	-154	-155	193	-1 097	247
T_z_p/（N·m）	113	65	0	-176	305	-857

直线距离/mm	拉伸刚度/（N·mm^-1）	压缩刚度/（N·mm^-1）
150~130	0.185	0.18
130~110	0.12	0.125

Ultra-agile ultra-stable and ultra-pointing platform with additional connection

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[4]	Hu Haiyan. DESIGNING ELASTIC CONSTRAINTS IN A VIBRATION ISOLATION SYSTEM FROM THE VIEWPOINT OF NONLINEAR DYNAMICS [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 1996, 17(5): 18-22.
[5]	Gu Qitai. ROBUST CONTROL OF AN ACTIVE VIBRATION ISOLATION SYSTEM FOR HELICOPTERS [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 1989, 10(1): 48-54.

参数	自适应预设性能	PID控制
控制精度/（°）	10^-6	10^-5
收敛时间/s	40	92