摘要:

AbstractAn impulsive optimization method and the results of a suboptimal atmospheric guidance program are combined to produce an efficient solution to the aero‐braking problem. For a specified initial and final orbit, the solution determines: (1) the minimum of the sum of the magnitudes of the impulse vectors, (2) the optimal atmospheric entry and exit state vectors (subject to both equality and inequality constraints) and (3) the optimal coast times. Numerical solutions are presented to illustrate characteristics of the solutio

ISSN:0143-2087    

DOI:10.1002/oca.4660060102

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

年代:1985

数据来源: WILEY

摘要:

AbstractA direct state‐space approach to the digital control of multivariable linear systems is presented. Control is provided by minimizing the mean square error between controlled plant outputs and specified desired output trajectories at sampling instants. Linear equations for digital control inputs are solved in constant forward and feedback gain form. Numerical applications to problems in simple model following, digital redesign and direct digital design are give

ISSN:0143-2087    

DOI:10.1002/oca.4660060103

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

年代:1985

数据来源: WILEY

摘要:

AbstractThe paper develops a new method for optimized calibration of large‐scale non‐linear water networks. Calibration requirements are first discussed with relevance to the limited monitored operating data, the ill‐defined network parameters and the potential benefits of more accurate network simulations for analysis and control purposes. A formulation is then made which incorporates simultaneous adjustment of network physical parameters and related operational data in order to force agreement between measured and simulated variables. The system non‐linear response is represented by a high‐dimensional set of linear‐equations relating controllable adjustment parameters to the observed discrepancies in operating conditions. Quadratic performance indices, with optional user‐defined weighting factors, are shown to be most appropriate for the control variables. Use of a hierarchical optimization technique permits a solution to be obtained to the problem of high dimensionality with constrained controls and variable performance factors. Application of the scheme to a test distribution system leads to optimal adjustment of all the permitted variables to give the best overall solution for the available measurements. An important practical feature is the ease with which engineering experience can be incorporated to yield alternat

ISSN:0143-2087    

DOI:10.1002/oca.4660060104

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

年代:1985

数据来源: WILEY

摘要:

AbstractApplication of the methods of control theory to industrial problems demands a match of the necessary computational tools to the actual financial constraints. The development of suboptimal control algorithms allows performance gains that were limited in the past to installations with extensive computer facilities to be reached now by smaller ones. Advances in this domain lead naturally to a rational use of modern control tools based on mini‐ and microcomputers. Within this framework, we present a general method for the optimal control of electric power plants. The optimization problem is described and formulated as the optimal control of a multivariable state‐space model in which the state and control vectors are constrained by sets of equality or inequality relations. The solution is obtained in two steps with linear and dynamic programming methods; the results are expressed in the form of parametric algorithms which set up the working point of the turbine‐generator units so that the resulting profit represents a maximum. The application of the method to the optimization of the production of a Swiss electricity company illustrates the app

ISSN:0143-2087    

DOI:10.1002/oca.4660060105

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

年代:1985

数据来源: WILEY

摘要:

AbstractThe dynamic problem of optimal manpower planning in a public agency is considered. The budget available to the bureau is replenished at a rate proportional to the output. The objective of the bureau manager is to maximize the staff at the terminal time. The model is non‐linear in the control, the hiring rate. Cases where a deficit is allowed are also considered. Boundary solutions are investigated for the case of no deficit, and it is shown that the hiring rate is non‐differentiable but continu

ISSN:0143-2087    

DOI:10.1002/oca.4660060106

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

年代:1985

数据来源: WILEY

ISSN:0143-2087    

DOI:10.1002/oca.4660060107

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

年代:1985

数据来源: WILEY

ISSN:0143-2087    

DOI:10.1002/oca.4660060108

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

年代:1985

数据来源: WILEY

ISSN:0143-2087    

DOI:10.1002/oca.4660060109

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

年代:1985

数据来源: WILEY

ISSN:0143-2087    

DOI:10.1002/oca.4660060110

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

年代:1985

数据来源: WILEY

ISSN:0143-2087    

DOI:10.1002/oca.4660060111

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

年代:1985

数据来源: WILEY