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The International Journal of Robotics Research
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Forward Kinematics of a General Fully Parallel Manipulator with Auxiliary Sensors

Yu-Jen Chiu

Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu 30043, Taiwan, R.O.C.

Ming-Hwei Perng

Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu 30043, Taiwan, R.O.C.mhperng{at}mx.nthu.edu.tw

This paper presents a solution scheme for forward kinematics of a general fully parallel manipulator that guarantees a unique solution with only three redundant sensors. The redundant sensors were designedtominimizeengineeringdifficultiesintherealization, whereas an optimal sensor location was proposed to achieve a numerical efficiency and accuracy significantly better than existing solutions. As a result, the present approach is insensitive to misalignment of sensor location and measurement errors. Due to these merits, the present approach can handle joint misalignment due to machining error and assembly when it is applied to the task of self-calibration, which requires extreme precision. It is also suitable for applications in which real-time computation is needed.

Key Words: parallel manipulators • forward kinematics • redundant sensors

The International Journal of Robotics Research, Vol. 20, No. 5, 401-414 (2001)
DOI: 10.1177/02783640122067462
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