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By John Pittner
The tandem rolling of chilly steel strip is a huge, hugely advanced nonlinear multivariable procedure the keep an eye on of which poses an important engineering problem. present controllers have confirmed to be at risk of disturbances and uncertainties in approach variables and makes an attempt to extend robustness to those phenomena have had their very own drawbacks so a brand new procedure is required. Tandem chilly steel Rolling Mill keep an eye on bargains basically with a singular and functional complicated strategy for keep an eye on of the tandem chilly steel rolling procedures according to the state-dependent Riccati equation approach that is lately rising as an invaluable process for keep an eye on of advanced nonlinear structures. heritage fabric is gifted to aid the reader with a normal keep watch over heritage to understand the importance and sensible merits of the recent complicated keep an eye on scheme over traditional and extra lately proposed complex suggestions. a quick background of tandem chilly rolling is by means of descriptions of assorted sorts of chilly rolling approaches and a easy mathematical version of the method. the various traditional and complicated keep an eye on tools and their merits and drawbacks are in comparison, and a close therapy of the theoretical and sensible points of the state-dependent algebraic Riccati equation procedure given. the explicit info of the hot technique are defined in a fashion now not requiring precise services within the keep an eye on of tandem chilly rolling. the result of simulations played to make sure the keep an eye on version and total process functionality with the hot controller coupled to the method version are incorporated. Simulation effects and knowledge derived from genuine working turbines are in comparison which will make concrete the advancements in functionality utilizing the hot approach. also, fabric is incorporated which exhibits the hot strategy to manage to extension to the regulate of a large diversity of large-scale complicated nonlinear strategies. Engineers operating with regulate platforms within the steel processing industries will locate that the complicated regulate rules promulgated right here could be of substantial profit in expanding the robustness in their structures and, consequently, the standard in their items. Tandem chilly steel Rolling Mill keep an eye on will also be necessary to teachers and graduate scholars attracted to complex computerized keep watch over and its functional software and within the makes use of of the state-dependent Riccati equation in particular.
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Additional info for Tandem Cold Metal Rolling Mill Control: Using Practical Advanced Methods
Example text
In addition, the tension by speed method is user-friendly and easy to tune at commissioning. e. the gage) at the centerline of the strip as it exits the mill, and also the thicknesses at the exit of the intermediate stands. Of course, not every conceivable configuration can be evaluated. Rather than try to review a host of different specific configurations and then determine their strengths and weaknesses, it is preferred to present some basic concepts by which almost any particular approach to automatic thickness control (or automatic gage control, denoted as AGC) can be examined, and then present some applicable examples, so that the reader may get the general flavor of conventional automatic thickness control, and then use the previous material on non-interactive control plus what is presented herein to understand and evaluate a particular application.
1 In an ideal cold rolling application no closed-loop control is required. This is because the settings of the various actuators of the mill are preset according to a pre-calculated rolling schedule which is based on the desired reduction at each stand, the desired interstand tensions, and the desired strip flatness. The rolling schedule calculations consider the loading capabilities of the various mill stands plus the capabilities and limitations of the mill actuators, which typically are the work roll position actuators, the work roll speed actuators, and the actuators (such as roll bending jacks) which affect the flatness of the strip.
5. 6, with the work roll speed of stand 3 remaining fixed at 100%. 34) stand i stand i + 1 tensiometer tension reference tension controller Fig. 04 0 2 4 6 8 10 12 time (seconds) 14 16 18 20 Fig. 6 Open-loop response of interstand tension and strip speed difference to a รพ1% step change in the reference of the stand 2 work roll speed actuator at 100% speed how at steady-state these speeds must match, assuming that there is no stretching of the strip. As in the case of tension by gap, it can be seen that the open-loop tension response lends itself well for the control of tension by speed.