High-precision Measurement And Evaluation Of Aviation Blade Based On Non-diffraction Grating Structured Light

Aviation blades are the core components of high-performance aircraft engine, its quality directly determines the performance and security of the aircraft engine. How to measure the three-dimensional shape of aviation blade fast and precisely is a new research trend. But the commonly used measurement methods for aviation blade 3D surface can not satisfy the requirements of accuracy and high efficiency. In order to solve those problems, this paper presents a 3D shape precision measurement system for aviation blade based on non-diffraction grating structured light projection and then gives out the corresponding evaluation method of surface parameter. In this paper, the main work is as follows:The commonly used measurement methods for aviation blade are introduced, and a new precision 3D shape measurement method based on non-diffraction grating structured light is proposed. The principle of the measurement model and the camera imaging system are presented, and then the actual parameter calibration experiment is carried out at the same time.Analyze the laser-speckle on the fringe image, and an effective speckle reduction method is described through the filter experiment. For lack of the existing methods, a new method to obtain width of the projected fringe is put forward. The principles of FTP and PMP are given out, then choosing the more appropriate one by comparing the advantages of two methods.This paper focuses on the research of PCA coarse registration algorithm and ICP precise registration algorithm. The experiment of data registration is done, and results verifies the accuracy and versatility of the algorithm.The experiment platform is constructed according to the measuring principle and key technology, after that the measurement experiments for standard object and aviation bladeare carried out. At the end, the surface parameters of blade is evaluated by the way of data registration.