PARAMETER-IDENTIFICATION AND OPTIMAL-CONTROL OF GROUND TEMPERATURE

To avoid the use of pesticides on putting greens of golf courses, a te mperature regulator system is strongly recommended nowadays in Japan. To maintain grass on the putting green without pesticide, the temperat ure of the ground should be controled. This system consists of a cooli ng machine and buried pipes in the ground. The temperature of the wate r in the pipes cannot be regulated. In this paper, both identification and control problems are presented by the minimization technique and applied to a practical problem. To establish the system, it is importa nt to obtain accurate parameters which are included in the governing e quation. These parameters can be determined by parameter identificatio n. The conjugate gradient method is used for the parameter identificat ion procedure. The control problem aims to make the temperature at arb itrary points close to the objective temperature. The discrete-time dy namic programming is used for the control procedure.