Design of the force sense unit for space robot end-effector
Qingli Zhang, Yingyuan Zhu, F. Ni
Dec 19, 2009
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2009 IEEE International Conference on Robotics and Biomimetics (ROBIO)
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Key Takeaway Key Takeaway: The force sense unit designed for space robot end-effector provides reliable and accurate feedback on capture force, meeting design targets for reliability, delicacy, and stability.
Abstract
In the process of space robot capturing, the space robot end-effector was in open-loop state, and the robot controller could not estimate if the capture interface was in desired position. Hence a force sense unit adapted to vicious outer space environment used as the capturing force feedback to the control system was designed. By the method of mechatronics integration design, the force sense unit was integrated into the robot end-effector, which enhanced the reliability, reduced the installing and debugging difficulty. The structure of sensor's elastomer was modeled, and then it was analyzed by the FEA software Patran/Nastran. At last, inherence frequency of the sensor was figured out from mode analyzing, and a number of object capture tests were carried out. Experimental results showed that degree of non-linearity (1.7%), delicacy (0.0025 V/N) and stability of the sensor unit was significantly accorded with the design targets of space robot end-effector.