Design And Implementation Of Vision Measurement System On Three-dimensionalmotion Parameters By Software

The nozzle three-dimensional motion parameters measurement has important significance for the research and design of motor vector power and the flight posture of rocket in the static testing of rocket engine, but it ii not easy to achieve. In order to solve these problems, this article designs a nozzle motion parameters measurement based on multi-vision to measure the pivot point, axis of nozzle, pivoted axle, vector angle and angular acceleration of nozzle, and realized the function of three-dimensional motion parameters measurement, error compensation model and man-machine interface by means of software design.The article presented the general scheme of measurement system, used four high-speed measurement of camera to get reflective marker balls image acquisition during acquisition nozzle infrared reflective marker balls image, through measuring the parameters of marker balls, establish the algorithm model to measure the nozzle motion parameters. First, calculate pivot point and vector angle by two-section measurement model, then establish the nozzle axis projection measurement model creatively to solve the problem of the measurement of rocket nozzle vector angle, and it can also establish the error compensation model to compensate rocket nozzle motion parameters which measured; Through the software design to complete each function modules, providing users with a visual interface.Using biaxial swing-linear calibration lifting movement, in the environment of measurement system software, through measuring the model of pivot point and vector angle and realizing each functional modules correctly, the article debugs system wholly and verifies the stability and accuracy of the measurement system. Through a large number of experimental analysis, The results show that: In the space range of±12°and the context of the peak speed≤60°/s, the Limit error of nozzle pivot point has nothing to do with nozzle angular velocity, the Limit error of nozzle vector angle, the Limit error of nozzle angular velocity, the Limit error of nozzle angular acceleration and nozzle angular velocity was a positive correlation; the Limit error of nozzle pivot point is 0.103mm, the Limit error of nozzle vector angle is 0.041°, the Limit error of nozzle angular velocity is 0.72°/s, the Limit error of nozzle angular acceleration is 3.9°/s2.