Systematic Error Elimination Method for Mechanical Stability Test Data

In the relative positions measuring of mechanical structure system, a general method is to establish a reference coordinate by the selected reference points, then the coordinates of each measuring points in the reference coordinate can be obtained. Due to the influence of environment, equipment and so on, there will be systematic error in the reference points. When the measured points are projected to the reference coordinate, the systematic error of the measured points can be amplified when the reference points have large errors or there has a large distance between the reference points and the measured point. A data processing strategy based on coordinate transformation is proposed, so that the test data doesn't depend on the selection of reference points, which can improve the robustness and the test accuracy.