Spacecraft Dynamics in the Vicinity of a Comet

The ground-based spacecraft dynamics simulator plays an important role in the implementation and validation of attitude control scenarios before a mission. The development of a comprehensive mathematical model of the platform is one of the indispensable and challenging steps during the control design process. A precise mathematical model should include mass properties, disturbances forces, mathematical models of actuators and uncertainties. This paper presents an approach for synthesizing a set of trajectories scenarios to estimate the platform inertia tensor, center of mass and aerodynamic drag coefficients. Reaction wheel drag torque is also estimated for having better performance. In order to verify the estimation techniques, a dynamics model of the satellite simulator using MATLAB software was developed, and the problem reduces to a parameter estimation problem to match the experimental results obtained from the simulator using a classical Lenevnberg-Marquardt optimization method. The process of parameter identification and mathematical model development has implemented on a three-axis spherical satellite simulator using air bearing, and several experiments are performed to validate the results. For validation of the simulator model, the model and experimental results must be carefully matched. The experimental results demonstrate that step-by-step implementation of this scenario leads to a detailed model of the platform which can be employed to design and develop control algorithms.

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The Design and Implementation of Spacecraft Co-Simulation Platform

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.591-593.174 ◽

2012 ◽

Vol 591-593 ◽

pp. 174-178

Author(s):

Hang Yin ◽

Yong Ming Gao ◽

Chao Wang ◽

Xin Xing Li

Keyword(s):

Continuous Improvement ◽

Simulation Analysis ◽

Simulation System ◽

Simulation Software ◽

Simulation Framework ◽

Simulation Technology ◽

Spacecraft Dynamics ◽

Design And Implementation ◽

Complex Simulation ◽

Analysis System

With the continuous improvement of complexity in the space simulation system and the enhancement of multi-technology integration, the co-simulation technology is an important way to solve complex simulation problems in the big system. After analysis of relative theories and main methods of co-simulation, collaboration data interfaces among multiple software are improved and matched with a number of simulation software system. The co-simulation framework is designed and a set of spacecraft dynamics co-simulation analysis system is established on the frame of HLA / RTI and on the principle of co-simulation technology. The key task on orbit service of the spacecraft is modeled and simulated. The software can complete the work that a single simulation software could not be done and achieve good results.

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