| Author | Roy, Kompally Revanth |
| Note | A thesis submitted in partial fulfillment of the requirements for the
degree of Master of Engineering in
Mechatronics |
| Publisher | Asian Institute of Technology |
| Abstract | This thesis studies the influence of pendulum motion on an orbital maneuver of a microsatellite with a single elastic tether system at Low Earth Orbit using Lyapunov based MIMO-MRAC algorithm. Two cube microsatellites together with a cable typed tether joining between them form a Tethered satellite system (TSS). Due to the presence of tether disturbances, it causes pendulum motion which perturbs the orbital position of microsatellite. An analysis on the microsatellite dynamics using classical Keplerian orbital elements (CKOE) given by Gauss variational Equations (GVE) and modified Equinoctial Orbital Elements (EOE) using Lagrange Perturbation equations (LPE) is made to verify the microsatellite dynamics. For this case, non-spherical harmonic gravitational perturbation term given by the potential function of Earth’s gravitational field is applied as a disturbance. To validate the tether dynamics, an analysis on cable dynamics is made by the combination of Finite Element Method (FEM) to obtain first-order discretized ordinary differential equations (ODE) and 14th order Runge-Kutta method (RK14) is used. For both the validation models, linear and nonlinear control of the proposed algorithm are applied and the results are almost the same. A linear analysis on the orbit deviation of TSS due to the influence of the pendulum motion is been made using GVEs and RK 14. A linear control of proposed algorithm is established to maintain the orbital position of the TSS and to control of the pendulum motion of the tether simultaneously. A simulation result shows the good orbital tracking convergence of the TSS in which its perturbed orbit follows a predicted reference orbit precisely by reducing the disturbances. |
| Year | 2019 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Industrial Systems Engineering (DISE) |
| Academic Program/FoS | Microelectronics (ME) |
| Chairperson(s) | Keun, Song Weon ; |
| Examination Committee(s) | Manukid Parnichkun;Pisut Koomsap; |
| Scholarship Donor(s) | AIT Fellowship; |
| Degree | Thesis (M. Eng.)--Asian Institute of Technology, 2019 |