| China will launch the "No.1 Temple" in the second half of 2011, this announcement suggests that the China's spacecraft rendezvous and docking mission has been developed into the phase of actual research and development test. The critical and strategic of Spacecraft rendezvous and docking technology highlights, whether from economic or in terms of time, the ground simulation system of rendezvous and docking is the best choice of the final approach phase of guidance policy to study and test the spacecraft. The ground simulation system includes measurement part and control part, and this paper mainly aimed at the control system to adjust and design the structure of dual actuator and controller, and design controller for different actuators with simulation.First, for a ground-simulation platform, the actuator is the power source of its guidance. Currently, the main actuators of spacecraft include thruster and flywheel. According to these two actuators, this paper design the hardware and software and install them to debug, and software focus on the design of communication protocol and experimental validation.Secondly, considering the principles and characteristics of the cold jet drive system, select the PWPF regulator for it. After the working principle of the PWPF regulator is given, this paper mathematically deduces the relationship and laws between the duty cycle and parameter of regulator, then make simulation and experiment to verify its effectiveness. Using the working principle of PWPF regulator and the derived laws, the controller is designed to control the attitude and position of the cold jet actuator, and the control accuracy is improved.Again, the working principle of flywheel system is derived for another set of drive system of the floating platform that is the flywheel drive system, and finally a dynamic model of the satellites with rigid flywheel is given. According to its working principle and dynamic model, for the attitude control of ground simulation system, two kinds of three-axis controllers are designed, and made simulation.Finally, according to the characteristics of the dual-drive system respectively, using the redundancy of its actuator, design and control the distribution rate law of the attitude control of simulation system. Mathematical description of distribution of multi-actuators control of ground simulation platform is given. Select strategy of distribution according to specific target, and make comparison based on simulation. Control and switch strategy of multi-actuators is given, comparing with the control distribution, it can get good results in practice. |
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