By John Pittner
The tandem rolling of chilly steel strip is a huge, hugely advanced nonlinear multivariable strategy the regulate of which poses an important engineering problem. current controllers have confirmed to be at risk of disturbances and uncertainties in procedure 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 regulate offers basically with a singular and sensible complicated process for regulate of the tandem chilly steel rolling techniques in response to the state-dependent Riccati equation procedure that's lately rising as an invaluable procedure for keep watch over of complicated nonlinear platforms. historical past fabric is gifted to aid the reader with a common keep an eye on history to understand the importance and sensible benefits of the hot complex keep watch over scheme over traditional and extra lately proposed complex concepts. a brief historical past of tandem chilly rolling is by way of descriptions of assorted sorts of chilly rolling strategies and a simple mathematical version of the method. the various traditional and complicated keep an eye on equipment and their benefits and downsides are in comparison, and an in depth remedy of the theoretical and functional elements of the state-dependent algebraic Riccati equation procedure given. the explicit information of the recent technique are defined in a way no longer requiring designated services within the keep watch over of tandem chilly rolling. the result of simulations played to ensure the keep watch over version and total procedure functionality with the hot controller coupled to the method version are integrated. Simulation effects and information derived from real working generators are in comparison which will make concrete the advancements in functionality utilizing the recent approach. also, fabric is integrated which exhibits the recent strategy to be able to extension to the regulate of a wide diversity of large-scale complicated nonlinear methods. Engineers operating with keep an eye on platforms within the steel processing industries will locate that the complex keep watch over rules promulgated the following should be of substantial gain in expanding the robustness in their structures and, hence, the standard in their items. Tandem chilly steel Rolling Mill regulate will also be priceless to lecturers and graduate scholars drawn to complex computerized keep watch over and its useful program and within the makes use of of the state-dependent Riccati equation in particular.
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Extra resources for Tandem Cold Metal Rolling Mill Control: Using Practical Advanced Methods
Examination of the previous structure of the non-interactive controller illustrates the complex interactions between the various variables in the tandem cold mill and provides good insight into their behavior in the presence of a tension disturbance and a thickness disturbance, plus illustrating the need for consideration of the conservation of mass flow in the various areas of the mill. However, while an examination of the non-interacting structure is a good exercise to become initially acquainted with the mill behavior, it should be recognized that several assumptions are made in the preceding analysis that would make this technique less than desirable in a practical setting.
Of interest in this linearization are the changes in specific roll force P and the forward slip f. 4) where hin is the input thickness, hout is the output thickness, T is the strip tension force, and i is the stand number. 10) where symbols are as previously defined in Chapter 2. 1 41 Control of Interstand Tension Using the above derived relationships, it can easily be seen that under certain assumptions for a change in tension dTi;iþ1 , controlling the roll gap actuator positions and work roll speeds on stands i and i þ 1 can tend to prevent excursions in the other thicknesses and tensions.
Wrecks in the mill) is reduced. Additionally, during normal operations the mill operator often makes slight adjustments in the reduction taken at a stand to slightly shift the loading at each of the stands in the mill, and also may adjust individually the interstand tensions. In the case of continuous mills, the product can change very rapidly (in milliseconds) during the passage of the weld through the roll bite. This puts severe requirements on the mill controller to reduce the rapid change in the roll force during weld passage so as to prevent damage to the work rolls.
Tandem Cold Metal Rolling Mill Control: Using Practical Advanced Methods by John Pittner