부산대학교 도서관

Modern greenhouse creates suitable crop growth conditions through changing inside temperature, humidity, solar radiation, concentration of carbon dioxide and other environmental factors to raise production and increase economic benefits. The greenhouse microclimate environment model can not only simulate the behavior of a system well but also design the inside controller suitably to be applied to the greenhouse production. The temperature system in a greenhouse microclimate environment can be regarded as a multi-input single-output hybrid system. In this paper, the system was described by Auto Regressive Moving Average model with eXternal inputs (ARMAX). The test data were analyzed for the correlation of input variables and output variable. Then, by means of fading memory recursive least squares, the parameters of the model were identified. Finally, the model was simulated and tested. The actual values were fitted by simulation values and the fitting degree reached 0.91 which showed the model was effective.