Development Of Large Gear In-Suit Measuring System Base On Coordinates Method

Gear is one of the most important transmission parts in mechanical equipment. With the development of machinery industry, requirements for gear precision and other related parameters are becoming more and more strictly, which also make the demands of gear measuring keeping improved. As one kind of the machine elements that have complicated shape and plenty of error, gear measuring is always being the difficulty in mechanical measurement. Because of the lack of instruments for measuring large gear, it seems urgent to develop a simple and feasible measuring method.This thesis analyzed the fundamental principle of large gear at first, and meanwhile made an intensive study of the method about large gear measuring, put forward the in-suit measurement of large gear based on coordinates method, which has been verified in experiments and made improvement based on contrasting measuring data. Basic measuring process is to use method of coordinates to collect data and calculate error by means of curve fitting, genetic algorithms, etc.After further researching the related theoretical knowledge about large gear in-suit measuring, aimed the situation that high accuracy position could not be achieved, the method of using curve fitting was presented in this thesis and methods of correcting and compensating were also to be given after analyzing instruments precision. With the characteristics of system such as motion control and data collected, this thesis implemented the method of mixed programming which based on MATLAB and VC++, measuring part of parameters by neural network fitting, and put forward a scheme about expert system under considering gear error of various kinds. Thesis was divided into parts as follows: basic principles of system and parameters instruction, profile deviation measuring, tooth pitch deviation measuring, radial runout of tooth thickness measuring, error amending, and expert system, etc. It introduced the structure of institution,basic principles and parameters at fist part, Making use of VC++ to design and test measurement controlling software. The software has completed the measure and assessment of tooth profile errors, alignment errors and tooth pitch deviation, and introduced Some experiments about the measuring. At last some of the errors in this measuring system have been analyzed, and some compensation has been made for these errors.In the design and development of in-suit measuring for large gear, it shows that the principle is correct and the technology is feasible based on experiments and analysis.