From Plant Data to Process Control: Ideas for Process - download pdf or read online

By Liuping Wang

A qualified point e-book geared toward technique engineers in and researchers into structures and keep watch over engineering. It seems to be at theoretical advances within the quarter of approach engineering and a large choice of implementations.

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27r) radianslsec. 20, both in the time domain and the frequency domain. Without any data pretreatment, the algorithm obviously fails to produce a good model. 2. It is important to note that this procedure does not require perfect knowledge of the delay, but only a lower bound on the delay. 23: Step response test data from polymer reactor. Upper diagram: initiator Bow rate (ml/min); lower diagram: fraction monomer conversion An automated pilot-scale l-litre experimental polymer reactor system wit h facilities for on-line measurement of flow rate, temperature and density has been set up by Chien and Penlidis (1994a, b).

F'rom this figure, it is clear that several noise spikes in the measured monomer conversion appear during Step Response 1. The noise spikes that occurred during the initial part of the step response are handled using the proposed data pretreatment procedure.

4 = 1,2, . . 77). This plot shows that the optimal time scaling factor p is found over a very narrow range when this complicated system is being described by a low order model. e. the accuracy of the Laguerre model approximation improves. This increasing behaviour of the loss function gradually levels off once the model order reaches 8. Also, as the model order increases, the range of choices for an acceptable p value widens. Suppose that we choose N = 8 to approximate this 14th order system.

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