虛擬齒輪測量中心觸測算法及工件模型預(yù)處理
[Abstract]:Virtual gear measuring center is a set of software system developed with virtual technology based on real gear measuring center. It is mainly used to simulate the motion and measurement process of real gear measuring center and to process and analyze the data. Collision detection can be carried out for the virtual workpiece constructed by triangulation. In the process of collision detection, the original ergodic scan detection algorithm needs to calculate the distance between the probe and each triangular surface of the workpiece, the collision detection time is too long, and the speed of collision detection does not match the velocity of measurement. This results in gross error and even system crash. In order to improve the speed of collision detection, an ergodic scan detection method for workpiece model preprocessing is proposed in this paper. Before collision detection, the workpiece model is divided into several regions. In the process of collision detection, the intersection of the probe and each region is tested, and the collision distance is calculated by traversal scanning algorithm in the intersection region. And return the correct touch vector. Firstly, based on the analysis of the classical small block voxel partition method, a preprocessing method of the small sector voxel partition model is proposed for the characteristics of the rotary workpiece. Then, the synchronization design of multi-channel data sampling is carried out to solve the problem of synchronization of sampling data in virtual gear measurement center. Secondly, the program design of sector search traversal scanning algorithm is carried out, the algorithm evaluation requirements are analyzed, and the algorithm evaluation software is developed. The feasibility of the algorithm is carried out by constructing the workpiece model of rotary body, such as round bar, gear and so on. The feasibility and correctness of the algorithm design are verified by experiments such as the efficiency of the algorithm and the optimal selection of sector voxel partition coefficient. Finally, the simulation of the whole virtual gear measuring center is carried out, the zero correction and analysis, the simulation measurement of involute template with different precision and the error analysis are completed. Finally, the simulation measurement of involute gear tooth profile, helix and pitch is realized, which lays a good foundation for the analysis of error transfer mechanism of gear measuring center and the development of complex workpiece measuring program in the future.
【學(xué)位授予單位】:西安工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TG86
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