4th IFAC/IFIP International Conference on Digital Computer by Christopher E. Carter, Eric Rose (auth.), Professor M.

By Christopher E. Carter, Eric Rose (auth.), Professor M. Mansour, Professor W. Schaufelberger (eds.)

Digital pcs were used an increasing number of to manage diverse commercial methods over the last decade. As of this present day, many sy­ stems are designed to incorporate a method keep an eye on computing device as an essential component. using desktops has created a necessity for stylish me­ thods for the operation and supervision of advanced commercial proces­ ses. To summarize the state-of-the-art from the sensible in addition to from the theoretical viewpoint, the 4th IFAC/IFIP overseas convention on "Digital machine purposes to technique keep an eye on" could be held at Zurich from March 19 to 22, 1974. the 1st vo­ lumes of the court cases comprise the accredited papers submitted to the convention pointed out above. The papers are prepared in line with the themes of the convention. a 3rd quantity will contain the six stick with­ ing survey papers: 1. electronic keep watch over Algorithms Prof. A. P. Sage, Dallas Texas / united states 2. Interface difficulties for procedure regulate Prof. T. J. Williams, Lafayette Indiana / united states three. software program for approach pcs Dr. J. Gertler, Budapest / Hungary Dr. J. Sedlak, Prague / CSSR four. electronic desktop purposes in Metallurgical approaches Mr. W. E. Miller, Salem / united states Mr. W. G. Wright, Schenectady / united states five. electronic laptop purposes in strength structures Mr. D. Ernst, Erlangen / FRG 6. electronic machine purposes in Chemical and Oil Industries Dr. H. Amrehn, Marl / FRG we are hoping, that the book of those papers from specialists.

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Additional resources for 4th IFAC/IFIP International Conference on Digital Computer Applications to Process Control: Zürich, Switzerland, March 19–22, 1974

Example text

Entry tension for stand 1 and exit tension for stand 5 were assumed to be held constant in this 28 example, as is generally the case. The following observations based on these numerical coefficients are noteworthy. 1. With the exception of stand 1, changing the roll-gaps only has negligible effect on thickness. In fact, if one scans down columns 2 through 5, it is evident that the primary effect of changing the roll-gap is on the corresponding upstream tension. These facts immediately suggest a tension control scheme where each interstand tension is controlled by the roll-gap of its adjacent downstream stand.

32 Solid-State Control The hardware and software is designed so that electro-mechanical devices such as disk memories are not required for continued functioning of the control. In this way, reliability is dependent only on solid state computing and interface equipment. Mill downtime due to failure in the computer associated equipment has been negligible. High-Level Language As much as possible, programs are written in a high level language such as FORTRAN. Where necessary, additional hardware is purchased to make this feasible.

The corrections are non-interacting with tension (or approximately so) and with delivered thickness (see the appendix). For example, if a change is being made to increase the power on stand 2 while decreasing that on stand 3, the gap on stand 2 is decreased by an amount based on a power model for the product being rolled. Simultaneously, the speeds upstream of 2 (stand 1 in this case) are changed to maintain constant the interstand tensions. After waiting the interstand transport time delay (variable from a fraction of a second to a few seconds, depending on mill speed), a gap correction in the open direction is made on stand 3 such that the decrease in thickness now entering this stand is offset by the opening of the gap.

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