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題名 | A Simultaneous Control System Design of Temperature-Humidity-Carbon Dioxide in a Mushroom Growing House=洋菇舍溫濕度及二氧化碳濃度聯控系統設計 |
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作者 | 廖中明; 王鼎盛; 吳振甫; |
期刊 | 農業工程學報 |
出版日期 | 19920600 |
卷期 | 38:2 1992.06[民81.06] |
頁次 | 頁40-61 |
分類號 | 435.29 |
語文 | eng |
關鍵詞 | 二氧化碳; 洋菇; 設計; 溫度; 濃度; 濕度; 聯控系統; |
中文摘要 | 由乾空氣,水份及濕空中焓與二氧化碳濃度之聯立物質平衡式可推導出一線性控制模式,用以描述菇舍中溫度濕度與二氧化碳濃度之動態行為。由線性控制模式所模擬之反應結果與現場洋菇舍中量測所得之結果大致吻合。最佳回授控制器之設計,乃是基于現代控制理論中之線性二次調整器。最適性乃基于極小化一特殊積分二次目標函數,此目標函數可將菇舍內溫度,相對濕度及二氧化碳濃度之變異及控制能力極小化。脈衝及階梯式干擾兩者皆納入考慮且最佳回授P及PI控制器也被有效地合成。針對目標函數中控制器之回授增益也提出一靈敏度分析。分析結果指出二氧化碳控制器增益較溫濕度回授增益來得更靈敏。 |
英文摘要 | A linear control model which describes the dynamics of temperature, humidity, and carbon dioxide level in a mushroom house has been derived from simultaneous mass balance of dry air, water, enthalpy of moist air, and carbon dioxide levels. The responses from the linear control model are found to compare favorably with that from field measured results. Optimal feedback controllers have been devised from the viewpoint of modern control theory based on the linear quadratic regulators (LQRs). Optimality is based on minimizing indoor temperature, relative humidity, and carbon dioxide variations along with control effort. Both impulse and step disturbances are taken into account and optimal P and PI controllers are synthesized. A sensitivity analysis has been performed to study the sensitivity of the objective function with respect to the controller gains. Feedback gains of carbon dioxide controller has been shown to be far more sensitive as compared with that of temperature and humidity controllers. |
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