Abstract
This study focuses on the global dynamics of a linear tethered satellite formation (LTSF). Specifically, the influence of the initial states of the system on the motion forms and their critical values are presented in detail. First, an approximate but useful model for a high-dimensional nonlinear system is established in a noninertial reference frame, where three satellites and two space tethers are deemed to be particles and massless springs, respectively. Three types of typical in-plane motions, including the motions with spin axes perpendicular to an orbital plane, tangent to the orbit and passing through the Earth center, are examined in conjunction with the suppression of possible out-of-plane motions via control. Then, a Poincaré map is utilized to analyze the stability of the motion. A dynamic parameter domain is proposed to reveal three forms of motions and their critical values numerically. Finally, an equivalent ground experimental system is structured by virtue of the dynamic similarity principle to reproduce the dynamic characteristics of the orbital system.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- \(\varvec{DP}\) :
-
Jacobian
- \(d_{0i}\) :
-
Distance between adjacent satellites
- \(d_{g0i}\) :
-
Distance between adjacent simulators
- \(EA\) :
-
Stiffness of the tether
- \({\mathbf{F}}_{gi}^{{\text{c}}}\) :
-
Equivalent control force acting on simulator \(s_{i}\)
- \({\mathbf{F}}_{gi}^{{\text{G}}}\) :
-
Equivalent gravity acting on simulator \(s_{i}\)
- \({\mathbf{F}}_{gi}^{{{\text{IC}}}}\) :
-
Equivalent Coriolis force acting on simulator \(s_{i}\)
- \({\mathbf{F}}_{gi}^{{{\text{Ie}}}}\) :
-
Equivalent carrier inertial force acting on simulator \(s_{i}\)
- \({\mathbf{F}}_{i}^{{\text{c}}}\) :
-
Control force acting on satellite \(S_{i}\)
- \({\mathbf{F}}_{i}^{{{\text{IC}}}}\) :
-
Coriolis force of satellite \(S_{i}\)
- \({\mathbf{F}}_{i}^{{{\text{Ie}}}}\) :
-
Carrier inertial force of satellite \(S_{i}\)
- \({\overline{\mathbf{F}}}_{i}^{{\text{c}}}\) :
-
Dimensionless control force
- \(\varvec{f}\) :
-
Vector field
- \(\overline{G}_{i}\) :
-
Dimensionless gravity
- \({\mathbf{g}}_{i}\) :
-
Gravitational acceleration of satellite \(S_{i}\)
- \(\overline{K}_{0,i}\) :
-
Dimensionless stiffness of the tether
- \(L_{0}\) :
-
Unstrained length of the space tether
- \(L_{g}\) :
-
Current length of the experimental tether
- \({\mathbf{T}}_{i,j}\) :
-
Tension force from satellite \(S_{j}\) acting on \(S_{i}\)
- \(\overline{T}_{i,0}^{{}}\) :
-
Dimensionless tension force
- \(t\) :
-
Orbital time
- \(t_{g}\) :
-
Experimental time
- \({\mathbf{v}}_{i}\) :
-
Relative velocity of satellite \(S_{i}\)
- \(x_{i}\),\(y_{i}\),\(z_{i}\) :
-
Coordinate variable of satellite \(S_{i}\) in the noninertial orbital frame
- \(x_{gi}\),\(y_{gi}\),\(z_{gi}\) :
-
Coordinate variable of simulator \(s_{i}\) in the ground reference frame
- \(\overline{x}_{i}\),\(\overline{y}_{i}\),\(\overline{z}_{i}\) :
-
Dimensionless coordinate variable
- \(\delta_{i,j}\),\(\delta_{gi,j}\) :
-
Sign function
- \(\theta\) :
-
In-plane angle for Situation 1
- \(\theta_{0}\) :
-
Initial in-plane angle for Situation 1
- \(\lambda_{q}\) :
-
Characteristic root of the Jacobian
- \(\mu_{gE}\) :
-
Equivalent gravitational parameter
- \(\mu_{E}\) :
-
Earth gravitational parameter
- \(\nu\) :
-
Orbital true anomaly
- \(\nu_{g}\) :
-
Equivalent true anomaly
- \(\varvec{\xi }\) :
-
Dimensionless vector variable
- \(\varvec{\xi }^{(k)}\) :
-
The kth Poincaré point
- \(L_{g0}\) :
-
Unstrained length of the experimental tether
- \(\overline{L}_{0}\) :
-
Dimensionless unstrained length of the tether
- \(l_{r}\) :
-
Reference length
- \(m\) :
-
Satellite mass
- \(m_{g}\) :
-
Simulator mass
- N :
-
Ascending node
- O :
-
Earth center
- \(o{ - }xyz\) :
-
Noninertial orbital frame
- \(o_{g} { - }x_{g} y_{g} z_{g}\) :
-
Ground reference frame
- \(\varvec{P}\) :
-
Poincaré map
- \({\mathbf{r}}_{gi}\) :
-
Position vector of simulator \(s_{i}\)
- \({\mathbf{r}}_{gO}\) :
-
Corresponding vector to \({\mathbf{r}}_{O}\)
- \({\mathbf{r}}_{i}\) :
-
Position vector of satellite \(S_{i}\)
- \({\mathbf{r}}_{O}\) :
-
Position vector of the Earth center
- \({\overline{\mathbf{r}}}\) :
-
Dimensionless vector to \({\mathbf{r}}_{O}\)
- \(S_{i}\) :
-
Satellite i
- \(s_{i}\) :
-
Simulator i
- \({\mathbf{T}}_{gi,j}\) :
-
Equivalent tether tensile force from simulator \(s_{j}\) acting on \(s_{i}\)
- \(\xi_{1}\),\(\xi_{2}\),\(\xi_{3}\),\(\xi_{4}\) :
-
Dimensionless variable
- \(\varvec{\xi }_{p}\) :
-
Fixed point
- \(\Sigma\) :
-
Poincaré section
- \(\tau\) :
-
Dimensionless time
- \(\varphi\) :
-
In-plane angle for Situation 2
- \(\varphi_{0}\) :
-
Initial in-plane angle for Situation 2
- \(\phi\) :
-
In-plane angle for Situation 3
- \(\phi_{0}\) :
-
Initial in-plane angle for Situation 3
- \(\varvec{\Omega }\) :
-
Orbital angular velocity
- \(\Omega_{g}\) :
-
Equivalent orbital angular velocity
- \(\overline{\Omega }\) :
-
Dimensionless orbital angular velocity
- \(\omega_{gi0}\) :
-
Initial angular velocity of simulator \(s_{i}\)
- \(\varvec{\omega }_{i}\) :
-
Angular velocity of the subsatellite \(S_{i}\)
- \(\omega_{i0}\) :
-
Initial angular velocity of subsatellite \(S_{i}\)
- \(\overline{\omega }_{i0}\) :
-
Initial dimensionless angular velocity
- \({{\text{d}} \mathord{\left/ {\vphantom {{\text{d}} {{\text{d}}t}}} \right. \kern-\nulldelimiterspace} {{\text{d}}t}}\) :
-
Differential operation with respect to orbital time
- \({{\text{d}} \mathord{\left/ {\vphantom {{\text{d}} {{\text{dt}}_{g} }}} \right. \kern-\nulldelimiterspace} {{\text{dt}}_{g} }}\) :
-
Differential operation with respect to experimental time
- \( ( \cdot ) \) :
-
Differential operation with respect to dimensionless time \(\tau\)
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Acknowledgements
This work was supported by the Natural Science Foundation of China (12072147, 11732006, and 11672125), the Natural Science Foundation of Jiangsu Province of China (BK20211177), the Aviation Science Foundation of China (2020Z063052001), and the Research Fund of State Key Laboratory of Mechanics and Control of Mechanical Structures (MCMS-I-0120G03).
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Yu, B.S., Ji, K., Wei, Z.T. et al. In-plane global dynamics and ground experiment of a linear tethered formation with three satellites. Nonlinear Dyn 108, 3247–3278 (2022). https://doi.org/10.1007/s11071-022-07403-9
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DOI: https://doi.org/10.1007/s11071-022-07403-9