The Research Of Reconstruction Of Rocket Engines’ Inner-surface Based On A3DOF Experiment Bed With Laser Sensor

Because of the manufacturing techniques, shape of the rocket engine’s inner-surface is complex and uncertainty. Moreover, hard force on rocket engine’s surface is not allowed. Thus a simple method of detection is needed. Laser displacement sensor displacement measurement is a non-contact measurement with better single direction, high brightness, better monochromatic, better coherence and more precision, which is a good choice for measurement and reconstruction of a rocket engine’s inner-surface.In this paper, a3DOF experiment bed is made over for the measurement. The hardware architecture, software architecture and control model in the robot controller are introduced. It is concerned that of the control architecture of IPC, PMAC and servo-motors, the application of PMAC’s accessories, control models of servo-drivers, etc.. A special kinematics model with a fictitious angle of the test-bed is established, and calculate it in ordinal and inversely. An applied measurement method based on DXF data of rocket engine’s surface designing is proposed. Rapid and in-time adjusting measurement can be applied with two steps. The measurement project in QT with Windows VS2008environment is programmed and online tested. Bunch of data based on different step are restored. Fitting the data with different algorithm and comparing with the given reference curve, reflections of different fitting algorithm and different parameters are shown. A better choice range of fitting algorithms and parameters are given in the paper. On the basis of the fitting data, the3D model of the test inner-surface is reconstructed.