Relaxation methods for mixed-integer optimal control of partial differential equations

We consider integer-restricted optimal control of systems governed by abstract semilinear evolution equations. This includes the problem of optimal control design for certain distributed parameter systems endowed with multiple actuators, where the task is to minimize costs associated with the dynami...

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Published in:Computational optimization and applications Vol. 55; no. 1; pp. 197 - 225
Main Authors: Hante, Falk M., Sager, Sebastian
Format: Journal Article
Language:English
Published: Boston Springer US 01.05.2013
Springer Nature B.V
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ISSN:0926-6003, 1573-2894
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Abstract We consider integer-restricted optimal control of systems governed by abstract semilinear evolution equations. This includes the problem of optimal control design for certain distributed parameter systems endowed with multiple actuators, where the task is to minimize costs associated with the dynamics of the system by choosing, for each instant in time, one of the actuators together with ordinary controls. We consider relaxation techniques that are already used successfully for mixed-integer optimal control of ordinary differential equations. Our analysis yields sufficient conditions such that the optimal value and the optimal state of the relaxed problem can be approximated with arbitrary precision by a control satisfying the integer restrictions. The results are obtained by semigroup theory methods. The approach is constructive and gives rise to a numerical method. We supplement the analysis with numerical experiments.
AbstractList We consider integer-restricted optimal control of systems governed by abstract semilinear evolution equations. This includes the problem of optimal control design for certain distributed parameter systems endowed with multiple actuators, where the task is to minimize costs associated with the dynamics of the system by choosing, for each instant in time, one of the actuators together with ordinary controls. We consider relaxation techniques that are already used successfully for mixed-integer optimal control of ordinary differential equations. Our analysis yields sufficient conditions such that the optimal value and the optimal state of the relaxed problem can be approximated with arbitrary precision by a control satisfying the integer restrictions. The results are obtained by semigroup theory methods. The approach is constructive and gives rise to a numerical method. We supplement the analysis with numerical experiments.[PUBLICATION ABSTRACT]
We consider integer-restricted optimal control of systems governed by abstract semilinear evolution equations. This includes the problem of optimal control design for certain distributed parameter systems endowed with multiple actuators, where the task is to minimize costs associated with the dynamics of the system by choosing, for each instant in time, one of the actuators together with ordinary controls. We consider relaxation techniques that are already used successfully for mixed-integer optimal control of ordinary differential equations. Our analysis yields sufficient conditions such that the optimal value and the optimal state of the relaxed problem can be approximated with arbitrary precision by a control satisfying the integer restrictions. The results are obtained by semigroup theory methods. The approach is constructive and gives rise to a numerical method. We supplement the analysis with numerical experiments.
Author Sager, Sebastian
Hante, Falk M.
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  givenname: Falk M.
  surname: Hante
  fullname: Hante, Falk M.
  email: hante@math.fau.de
  organization: Department of Mathematics, University of Erlangen-Nuremberg
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  givenname: Sebastian
  surname: Sager
  fullname: Sager, Sebastian
  organization: Institute of Mathematical Optimization, Otto-von-Guericke University
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SubjectTerms Actuators
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Banach spaces
Chromatography
Control algorithms
Control equipment
Convex and Discrete Geometry
Differential equations
Dynamical systems
Dynamics
Integer programming
Management Science
Mathematical analysis
Mathematics
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Optimization
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