Research On Roll Eccentricity Compensation Algorithm And Simulation In Hot Rolling

Recently, the demand of users for slat gauge precision is constantly improved, and roll eccentricity becomes a more and more attentive subject. At present the method to control the thickness precision is universal AGC (Automatic Gauge Control).But the roll gap fluctuation caused by eccentricity is not solved by AGC. The operating principle of GM-AGC and roll eccentricity how to influence gauge control precision were expounded detailedly. All kinds of roll eccentricity compensation methods were researched systematically, and it has important theoretical purpose and actual application value to improve slat gauge precision and product quality.Because the roll eccentricity signal ( roll force signal and exit thickness signal ) possesses the periodical characteristic of approximate sine wave fluctuation, modern digital signals processing means —FFT is adopted in order to research the problem. The main contents of this paper include following parts:1) Inherent relation of AGC and REC (Roll Eccentricity Control) was explored. The formation reason and the signal characteristic of roll eccentricity were analyzed. The regularity question that rolled piece thickness and roll force was influenced by roll eccentricity was analyzed.2) According to reading comprehensive documentation about roll eccentricity compensation, various methods of roll eccentricity compensation were generalized and their algorithms and merits and faults were compared in this paper.3) According to the characteristic of roll eccentricity signal fluctuation and comparison of kinds of control methods, modern digital signals processing means —FFT was adopted. This method can analyze not only the signal frequency and phase frequency response of the signal being deal with on real time, but also accurately analyze the various harmonic wave component when sampling duration is equal to the integral multiple of the signal periodicity. The method is one kind of initiative roll eccentricity control ways. The signal filter in roll eccentricity and the detection of roll eccentricity component can be realized. The merit of the method can not only detect the component of roll eccentricity but also guarantee the compensation of the periodic thickness fluctuation of being...