Modeling and simulation research of a new calibration platform for visual test system

Abstract

It's a new method that 3D motion parameters of rocket motor nozzle are measured by vision measuring technology, but the dynamic mesurement precision of vision measuring system should be evaluated. The calibration platform with nozzle model can simulate the actual motion of rocket motor nozzle, and supply standard motion parameters for dynamic calibration to vision measurement system. After analyzing the motion of some type rocket motor nozzle, a new parallel table for calibration is proposed. The mechanism is made up of a base, a moving table and three links. There are three degrees of freedom, rotation on X or Y coordinate axis, displacement on Z coordinate axis. The rotation angle is measured by photoelectric encoder, the displacement is measured by grating scale. The closed loop test system have two main features. First, the rotation center is fixed because of cross shaft. Second, the position and pose of table can measured with high precision. Then the normal kinematic solution to position-pose of the table is presented. The virtual prototype is constructed on Pro/E, and the movement simulation is processed through Adams, thus the correctness of normal kinematic solutions to position-pose is verified.