Overview of Canadian Space Programs and R&D in Space Structures
讲座名称：
Overview of Canadian Space Programs and R&D in Space Structures
讲座时间：
2008-07-02
讲座人：
Wanping Zheng
形式：
校区：
兴庆校区
实践学分：
讲座内容：
Future space missions require next-generation space structures and robotics to be cost-effective, responsive, with better and more robust performance. Integrating smart material sensors and actuators, or other mechatronic devices is a solution to achieve these requirements. In this presentation, two research projects are introduced to demonstrate the potential of smart materials and intelligent systems technologies in achieving "Cheaper, Faster, Better" space structures and robotics systems.
The first project addresses dynamic modeling, experimental identification and active control of vibration in flexible linkages on a high-speed parallel robot using distributed piezoelectric actuators. An active vibration control algorithm in the modal space has been developed and implemented to control configuration-dependent linkage vibration. Numerical simulation and experimental results demonstrated that vibration caused by linkage flexibility is substantially reduced.
The second research project addresses active flatness control of membrane structures using shape memory alloy (SMA) actuators. Membrane structures to be used in large synthetic aperture radar (SAR) satellites will exhibit flatness issues mainly due to in-orbit thermal disturbances. Active flatness control is a vital technology in maintaining flatness of membrane structure to ensure functionality of the antenna, in the time-varying environment. Experimental results show a Fuzzy Logic Integrated Genetic Algorithm (AGA) is very effective in optimizing the active flatness control system.
In the end of the presentation, future research directions in intelligent robotic systems and gossamer structures are also briefly introduced.
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