https://scholars.lib.ntu.edu.tw/handle/123456789/87002
標題: | An optimal feedback control strategy for waste disposal management in agroecosystems | 作者: | Liao, Chung-Min Lin, Wen-Zer |
關鍵字: | Agroecosystem; Optimal feedback control; Technical coefficient; Waste disposal | 公開日期: | 1997 | 卷: | 21 | 期: | 3 | 起(迄)頁: | 165-174 | 來源出版物: | Applied Mathematical Modelling | 摘要: | A dynamic model based on the linear systems theory is implemented in designing optimal feedback control strategies to efficiently manage waste disposal in agroecosystems. A physical and mathematical review on the dynamic model leads to a residence time model describing the sojourn of waste disposal in an agroecosystem. Linear quadratic regulators (LQR's) with output feedback control of a linear-invariant system are chosen for the design algorithm. Both impulse and step disturbances are taken into account and optimal proportional (P) and proportional plus integral (PI) feedback control strategies are synthesized. To illustrate this procedure the design is applied to manage residual phosphorus concentrations in a typical integrated pig/corn farming system located in the south Taiwan region. Numerical data are obtained that could be used to design a controller minimizing fluctuations about a chosen equilibrium state. Numerical results from the model implementation show that the optimal selection of weighting parameters and the resulting costs vary with the desired equilibrium state. The designed optimal feedback controllers, when suitably tuned, give satisfactory management of residual phosphorus concentrations in the pig farm. A sensitivity analysis is also performed to study the sensitivity of the objective function with respect to the controller gains. Feedback gains associated with residual phosphorus in the pig-subsystem are shown to be far more sensitive compared with that in corn-subsystem. ? 1997 by Elsevier Science Inc. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/175975 | ISSN: | 0307904X | DOI: | 10.1016/s0307-904x(97)00005-x | SDG/關鍵字: | Linear quadratic regulators (LQR); Waste disposal management; Algorithms; Control system synthesis; Ecosystems; Feedback control; Mathematical models; Project management; Proportional control systems; Two term control systems; Waste disposal; Optimal control systems |
顯示於: | 生物環境系統工程學系 |
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