A novel geometric error identification and prediction approach

This paper proposed an integrated geometric error identification and prediction method to solve the uncertainty problem of PDGEs rotary axis. First, based on homogeneous transform matrix (HTM) multi-body system (MBS) theory, The transfer only considering C-axes rotated is derived position model. Then a errors axis introduced by measuring increment in three directions. Meanwhile C-axis are described as truncated Fourier polynomials caused fitting discrete values. Thus, converted into function coefficient. Finally, new model global frame verified through simulation experiments with double ball-bar tests.