摘要:

AbstractMinimum altitude‐loss flight of a sailplane through a given vertical wind distribution is discussed. The problem is posed as a non‐linear optimalcontrol problem, and several numerical solutions are obtained using a gradient projection algorithm. The initial and final states are required to be equal, though they may be either fixed or free. An unexpected new optimal trajectory type is found to exist for relatively short ranges and free boundary conditi

ISSN:0143-2087    

DOI:10.1002/oca.4660010302

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

年代:1980

数据来源: WILEY

摘要:

AbstractThe interaction between the two drugs, warfarin and phenylbutazone, is considered through a previously derived model. A minimum time problem, which involves a state constraint is formulated. This problem is investigated both analytically and numerically. The numerical results are obtained by transforming the state constrained problem to one which is singular and then using a conjugate gradient algorithm to obtain approximations to the optimal control. Further approximations to the control, the rate of infusion of phenylbutazone, are made so that the time profile is feasible for practical implementation.

ISSN:0143-2087    

DOI:10.1002/oca.4660010303

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

年代:1980

数据来源: WILEY

摘要:

AbstractThe dynamic programming algorithm is examined with a view to solving it on a multiprocessor cluster. The two methods of control‐space division and state‐space division are proposed, and their efficiency is analysed in detail. A practical example is given to illustrate the two methods using a two‐processor system, and the results are projected to find the minimum achievable time and optimum number of processors for this ex

ISSN:0143-2087    

DOI:10.1002/oca.4660010304

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

年代:1980

数据来源: WILEY

摘要:

AbstractA new approach to the hydro‐thermal optimal active and reactive power scheduling problem is proposed. The optimal schedules for a system with thermal and common‐flow hydro‐plants are obtained. The active‐reactive power balance model of the electric network is introduced. Although not as accurate as the load‐flow model, the present model is simpler. The scheduling problem is solved by use of the minimum norm formulation of functional analytic opt

ISSN:0143-2087    

DOI:10.1002/oca.4660010305

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

年代:1980

数据来源: WILEY

摘要:

AbstractSearch trajectories are determined with a research‐model, fully‐parallel, digital computer which has approximately the same speed capability as analogue computers and is constructed on similar design principles. Solution accuracy sensitivity to both algorithm and problem parameters is demonstrated. The advantages of speed and reliability of parallel digital circuits, in combination with the problem‐simplifying penalty function method, provides an improved optimization technique for applications in which speed rather than accuracy is the primary requir

ISSN:0143-2087    

DOI:10.1002/oca.4660010306

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

年代:1980

数据来源: WILEY

摘要:

AbstractThe design of deterministic LQP optimal control systems is considered for plants with control delays and a finite optimization interval. First, a solution is obtained to the fixed end‐point optimal control problem. An expression for the open‐loop optimal control is derived in thes‐domain. The closed‐loop optimal time‐varying gain matrix is then calculated from thes‐domain results. The open‐loop and closed‐loop solutions to the free end‐point optimal control problem are also given. The constant gain, infinite‐time, feedback control law is obtained as a limiting case of these results.The receding‐horizon optimal control problem for plants with control signal delays is also considered. The solution to this problem yields a constant feedback gain matrix which has obvious advantages for implementation. This gain matrix is not the same as the constant solution to the infinite‐time problem. The receding‐horizon control laws are derived for both the fixed and free end‐point problems, and these are shown to produce asymptotically

ISSN:0143-2087    

DOI:10.1002/oca.4660010307

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

年代:1980

数据来源: WILEY

摘要:

AbstractIn singular optimal control problems, the optimal control is determined by solving the algebraic equation which results by successively differentiating the switching function until the control appears explicitly. In certain classes of problems, the control never appears, and such problems are termed infinite‐order singular problems. It is shown that this class has many useful properties with respect to the theory and computation of optimal controls. In particular, it is shown that for the time‐invariant, singular, linear‐quadratic problem: (i) the singular order is infinity or less than or equal to the state dimension, (ii) infinite‐order problems can arise only from exact differential type cost functions, (iii) the range of the second‐variation operator (Hessian) is finite‐dimensional, (iv) the computational method converges strongly, and (v) conjugate direction methods converge in a finite number of steps. The latter property is especially useful in the generation of test problems for optimal control computat

ISSN:0143-2087    

DOI:10.1002/oca.4660010308

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

年代:1980

数据来源: WILEY

ISSN:0143-2087    

DOI:10.1002/oca.4660010310

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

年代:1980

数据来源: WILEY

ISSN:0143-2087    

DOI:10.1002/oca.4660010311

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

年代:1980

数据来源: WILEY

ISSN:0143-2087    

DOI:10.1002/oca.4660010301

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

年代:1980

数据来源: WILEY