Based On The Weighted Hamming Distance Of Plate-shaped Pattern Recognition Method And Its Engineering Application Research

Because of setting foot in production the high precision copper strips but now, the engineer and operator's not only lack knowledge about reasons of resulted strip flatness defaults, but also occur great blindness when adjusting different actuators for good strip flatness, which lead to unsteadiness of strip flatness quality.This paper is based on the application status of TongLing JinVi Copper Corporation's 1250 copper sheets and strips cold roughing mill and it's composed of ABB system of flatness control, aimed at the flatness quality of copper sheets and strips in producing. Through the theoretical analysis, a research for presetting model and flatness control model in the roughing mill, and combining with flatness pattern recognition problem, some work mostly about these have been done, which is as follows:1. This paper explains basic conception of flatness, flatness control law, and flatness control study on current situation.2. A synthesis analysis has been made in application status of the flatness system production actuality, the problems of the previous flatness system have been shown and an ameliorative plan has been brought forward in this paper.3. This paper explains a method of flatness pattern recognition, i.e. utilizes character of three pair of Legendre orthogonal polynomials opposite each other to show six flatness typical patterns, bases on the fuzzy recognition methods of margin of weight hamming distance to making flatness pattern recognition. Avoided defect of polynomials regress bringing great calculation and bad anti-interfere.4. The result of proves that the ameliorative method improves precision and speed in flatness pattern recognition by listing example.5. A presetting model of flatness target curve in cold roughing mill was established. This paper infers three membership grades to express each of flatness characteristic parameter of Legendre orthogonal polynomial term of first degree, term of second degree and term of fourth degree. The parameters of the target curve is analyzed and made sure of their meanings of practical use. The different parameter corresponding to flatness typical patterns is provided. The new target curve have an important supervise meaning on improving adjusting capability in cold roughing mill and ameliorating strip flatness quality.