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Identifiable parameters for the geometric calibration of parallel robots

Khalil W., Besnard S.

Archives of Control Sciences

2001

Vol. 11, no. 3/4

263-277

This paper presents a general method for the determination of the identifiable parameters for the geometric calibration of parallel robots. The special case of Stewart-Gough 6 degrees-of-freedom robot is considered in this paper. But this method can be applied for the other structures of parallel robots. The identifiable parameters of various calibration methods are given. Once the identifiable parameters are determined, we can deduce the corresponding physical identification. The method is based on QR decomposition of the observation matrix of the calibration equations. The proposed algorithm can also provide the grouping relations of the non-identifiable parameters with the identifiable parameters.