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Test of ACW-gradient optimisation algorithm in computation of an optimal control policy for achieving acceptable nitrate concentration of greenhouse lettuce

Author

Listed:
  • de Graaf, Stefan C.
  • Stigter, Johannes D.
  • van Straten, Gerrit

Abstract

The adjustable control-variation weight (ACW)-gradient method proposed by Weinreb [Optimal Control with Multiple Bounded Inputs, Department of Electrical Engineering, Stanford University, Stanford, 1985, p. 148] is put to the test in finding optimal control laws for an optimisation problem with bounds on the inputs and terminal state constraints, presented by Ioslovich and Seginer [Acceptable nitrate concentraion of greenhouse lettuce: an optimal control policy for temperature, plant spacing and nitrate supply, in: Proceedings of the Agricontrol 2000, Wageningen, The Netherlands, IFAC, Wageningen University and Research Centre, Royal Dutch Institute of Engineers, 2000]. By making certain assumptions they derived properties of the solution in an analytic way. Here, it is shown that the numerical ACW-gradient algorithm is capable of finding solutions without making additional assumptions.

Suggested Citation

  • de Graaf, Stefan C. & Stigter, Johannes D. & van Straten, Gerrit, 2004. "Test of ACW-gradient optimisation algorithm in computation of an optimal control policy for achieving acceptable nitrate concentration of greenhouse lettuce," Mathematics and Computers in Simulation (MATCOM), Elsevier, vol. 65(1), pages 117-126.
    • Handle: RePEc:eee:matcom:v:65:y:2004:i:1:p:117-126
    DOI: 10.1016/j.matcom.2003.09.020
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