摘要:

AbstractA suboptimal controller for a class of discrete‐time systems is presented. The controller is derived by first solving ‘off‐line’ a simplified optimal control problem obtained by neglecting part of the system state and by considering a larger time step, then by solving ‘on‐line’ at each time step an optimization problem based on the results of the previously solved ‘off‐line’ problem. A simple numerical example is presented to illustrate

ISSN:0143-2087    

DOI:10.1002/oca.4660150102

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

年代:1994

数据来源: WILEY

摘要:

AbstractThis paper presents the application of optimal control theory in determining the optimal feed rate profile for the penicillin G fed‐batch fermentation, using a mathematical model based on balancing methods. Since this model does not fulfil all requisites for standard optimal control, we propose a sequence of new models — that converges to the original one in a smooth way — to which the standard techniques are applicable. The unusual optimization of some initial conditions is included. We then state the conjecture that allows us to obtain the optimal control for the original model. The enormous gains in production and the vanishing of the characteristic biphasic behaviour through feed rate profile optimization raise some questions concerning the validity of this model. In this way this optimal control study can prove to be very useful for model discrimination purposes. Furthermore, mathematical and microbial insights lead to the construction of a suboptimal heuristic strategy — which we show to be a limiting case of the optimal scheme — that can serve as a basis for the development of robust, model‐independent, optimal adaptive cont

ISSN:0143-2087    

DOI:10.1002/oca.4660150103

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

年代:1994

数据来源: WILEY

摘要:

AbstractThe two‐stage synthesis of a multi‐input/multi‐output optimal proportional‐integral (PI) controller is described for linear, time‐invariant systems. In the first stage the PI controller is designed by solving a steady state algebraic Riccati equation. As a result, the optimal cost is expressed in terms of the system's constant output set‐points. In the second stage the cost is further reduced byoptimallyselecting the output set‐points to minimize a static quadratic performance index subject to linear algebraic constraints. The design framework is applied to a planar redundant robotic manipulator equipped with four joints and mounted at the tip of a long flexible arm. We then address the problem of self‐motion control in the presence of vibrato

ISSN:0143-2087    

DOI:10.1002/oca.4660150104

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

年代:1994

数据来源: WILEY

摘要:

AbstractThe problem of multivariable controller synthesis for a turbogenerator is considered. Using the feedback linearization approach for multi‐input non‐linear systems, the existence of a linearizing state feedback for the improved reduced‐order model of a turbogenerator is proved and the simplest form of this feedback is derived. Application of the obtained non‐linear controller to the multivariable control of a turbogenerator provides very good results not only for the reduced‐order model but also for the ‘exact’ (Park's) model of a turbogenerator. Simulations of fault and post‐fault conditions in the obtained nonlinear control system confirm its superiority over a system with a voltage regulator and power sy

ISSN:0143-2087    

DOI:10.1002/oca.4660150105

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

年代:1994

数据来源: WILEY

摘要:

AbstractThis short communication considers the linear quadratic problem with static output feedback. It is shown that an optimal solution can be successfully computed by finding the limiting solution of an ordinary differential equation which is given in terms of the gradient flow associated with the cost function. Several properties are obtained concerning the gradient flow. For example, it is shown that the flow contains a subsequence convergent to a locally optimal output feedback gain. In the special case of state feedback the flow is guaranteed to converge to the optimal gain. The effectiveness of the method is demonstrated by an example.

ISSN:0143-2087    

DOI:10.1002/oca.4660150106

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

年代:1994

数据来源: WILEY

ISSN:0143-2087    

DOI:10.1002/oca.4660150101

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

年代:1994

数据来源: WILEY