摘要:

AbstractThis, paper presents an application of recent singular perturbation modelling techniques for design and control of the F‐100 jet engine. The required feedback gains are calculated using a Chandrasekhar type of algorith

ISSN:0143-2087    

DOI:10.1002/oca.4660070102

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1986

数据来源: WILEY

摘要:

AbstractThis paper describes a non‐linear, S‐minimum time, feedback controller for a wind tunnel model and a numerical simulation of its performance. The model is a linear third‐order system with delay and a state‐variable constraint; it represents the dynamics of a Mach number control loop in a cryogenic wind tunnel. The design method involves a singular perturbation technique, an impulse control and a compensation of delay. Peformance of linear and non‐linear S‐minimum time control is compared in various operating conditions. The closed‐loop dynamics of the non‐linear system is examined by numerical simulations which exhibit the boundary‐layer phenomena in the control and the effects of various chan

ISSN:0143-2087    

DOI:10.1002/oca.4660070103

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1986

数据来源: WILEY

摘要:

AbstractA self‐tuning controller which automatically assigns weightings to control and set‐point following is introduced. This discrete‐time single‐input single‐output controller is based on a generalized minimum‐variance control strategy. The automatic on‐line selection of weightings is very convenient, especially when the system parameters are unknown or slowly varying with respect to time, which is generally considered to be the type of systems for which self‐tuning control is useful. This feature also enables the controller to overcome difficulties with non‐mini

ISSN:0143-2087    

DOI:10.1002/oca.4660070104

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1986

数据来源: WILEY

摘要:

AbstractThis paper describes a new multivariable self‐tuning controller that specifically handles different time delays between each of the input‐output pairs (multiple delays), and deals with unknown or varying time delay (variable dead time compensation) without requiring an explicit estimate of each delay. The new algorithm can control unstable and/or non‐minimum phase processes; it eliminates both set‐point and load offsets without having to maintain integral action continuously; it decouples the loops, both dynamically and at steady state. The effective decoupling algorithm not only minimizes significant interactions among the control loops, it permits the use of a very simple design criterion, namely the approximate assignment of the primary closed‐loop poles to prespecified locations. A straightforward autotuning technique locates the closed‐loop poles on‐line so as to optimize the system set‐point step responses. One desirable side‐effect is to account for inexact decoupling.The controller is demonstrated using a simulated paper machine head box having an unusually large amount of (off‐diagonal) interaction, a simulated two‐input, two‐output distillation column with time‐varying parameters (varying gains and time delays), and a highly interacting unstable and non‐minimum phase system on which the autotuning technique is demonstrated. These three processes place stringent requirements on any control method, and two of them have been used extensively in the literature to test various multivariable and/or self‐tuning algorithms. Hence, the success of the new technique indicates that it is a very promising candidate to deal with intransigent processes, i.e. those characterized as unstable, non‐minimum phase, time‐vary

ISSN:0143-2087    

DOI:10.1002/oca.4660070105

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1986

数据来源: WILEY

摘要:

AbstractA method is described for deriving a quasi‐optimal feedback control scheme for stabilizing power systems. This is achieved by minimizing a functional which is a linear combination of response time and control effort. The transient repsonse of a power system obtained using this control strategy is found to be superior to that achieved with a controller based on a linear regulator approach. This scheme, in a slightly modified form, is easily implemented in practice. The modification does not affect the effectiveness of the scheme to control transients. Simulation results are include

ISSN:0143-2087    

DOI:10.1002/oca.4660070106

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1986

数据来源: WILEY

摘要:

AbstractA number of sophisticated algorithms exist for the optimization of large‐scale systems. However, from a practical viewpoint one must always balance the cost of such optimization in applications with the saving that results. This paper presents a simplified algorithm for large‐scale gas networks which, although yielding a suboptimal energy saving, is nevertheless simple to apply and demands only moderate back‐up facilities. To illustrate the proposed method an example is chosen in which there are fifty nodes and three compre

ISSN:0143-2087    

DOI:10.1002/oca.4660070107

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1986

数据来源: WILEY

摘要:

AbstractA method of obtaining the optimal control in quasilinear systems which are influenced by disturbances is presented. The analysis is carried out for second‐order stationary and non‐stationary Gaussian processes. First, the stochastic problem is changed into an equivalent deterministic problem, and next the optimal control is constructed from the maximum principle. This method is applied to the optimal temperature profile in a chemical reactor. The results are illustrated by a numerical exam

ISSN:0143-2087    

DOI:10.1002/oca.4660070108

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1986

数据来源: WILEY

ISSN:0143-2087    

DOI:10.1002/oca.4660070110

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1986

数据来源: WILEY

ISSN:0143-2087    

DOI:10.1002/oca.4660070112

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1986

数据来源: WILEY

ISSN:0143-2087    

DOI:10.1002/oca.4660070113

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1986

数据来源: WILEY