Rotation Calibration Method for Thrust Based on Force Error Analysis

Accurate measurement of thrust in rocket engine, as a core parameter of attitude control of rocket engine, is an important guarantee for reliable operation of rocket engines. Therefore, it is very important for accurate calibration. In this paper, a novel rotation calibration method for rocket thrust engine is proposed based on piezoelectric force measurement system. Based on the calibration matrix, sensitivity analysis model of calibration accuracy to coupling relationship between axes is established, and error mechanism and offset mechanism of force are studied. Starting from the deviation principle between actual axis of thrust system and theoretical one, an elliptical geometrical distribution law of lateral force caused by main force is obtained. According to the periodicity of ellipse distribution of calibration force, a new calibration method, rotation calibration method, is obtained based on an idea of homogenization error. Finally, vector force verification is designed, and experimental data are calibrated with the rotation calibration method compared with the traditional linear calibration method, verifying feasibility and rationality of the calibration method. The novel calibration can be also used in force measurement in any rotation devices like manipulator in robot,thrust vector engine, manufacturing force, rocket engine,etc.