The invention provides a multi-support piezoelectric
dynamometer calibration method. The method is characterized by, through a translational main force loading mechanism, ensuring that
force lines ofthe main
load force and axes of piezoelectric three-dimensional force sensors are overlapped; applying
full scale of main force, repeating applying the force for many times, and collecting and repeating output
voltage; carrying out pretreatment on the data, and obtaining a force-power relation expression at each loading point according to the principle of equilibrium of forces; and combining the force-power relation expressions, constructing a calibration equation set model, calculating
condition number of a
coefficient matrix, calculating force-power conversion coefficient of each piezoelectric three-dimensional
force sensor and finishing calibration of a
dynamometer. The method, based on an existing calibration device and by improving the thought of calibration, sets a plurality of calibrated variables as unknown parameters, carries out multi-point calibration and establishes a multi-variable one-time calibration equation set without decoupling
hypothesis of each support force, thereby solving the problem of principle error due to force distribution
hypothesis in the previous calibration; and meanwhile, the method is not sensitive to position precision of each calibration point,and the positions at the axes of the sensors are selected as the calibration points.