發(fā)布時間：2018-04-22 07:31

  本文選題：設施環(huán)境 + 二氧化碳��； 參考：《農業(yè)機械學報》2017年03期

【摘要】：設計了一套基于無線傳感網的設施環(huán)境二氧化碳精準調控系統(tǒng),包括主控節(jié)點、監(jiān)測節(jié)點及補施節(jié)點,通過Zig Bee協(xié)議實現(xiàn)節(jié)點間信息交互。監(jiān)測節(jié)點實時獲取設施內多點二氧化碳濃度、溫度、光照數據;主控節(jié)點根據作物各階段最適生長環(huán)境,結合溫度與光照閾值,動態(tài)計算二氧化碳濃度目標值與實時值之間的差值作為調控參數,采用反饋控制實現(xiàn)二氧化碳動態(tài)調控;為改善以往設施二氧化碳補施不均的普遍現(xiàn)象,設施中氣體擴散管道采取雙M型布置方式,設計開孔大小不同的二氧化碳擴散孔,由補施節(jié)點配合對流裝置控制各小區(qū)域的二氧化碳排放量,達到均勻和定量補施的目的。實地布置和試驗表明基于無線傳感網的設施環(huán)境二氧化碳調控系統(tǒng)可實現(xiàn)穩(wěn)定可靠運行,以設施番茄為研究對象,在面積36.66 m~2日光溫室內補施目標值與實時值的相對誤差小于3.5%,在面積27.74 m~2玻璃溫室內驗證監(jiān)測節(jié)點間二氧化碳濃度變異系數小于2.93%,證明本系統(tǒng)可實現(xiàn)二氧化碳精準及均勻補充。
[Abstract]:A wireless sensor network-based precise control system for carbon dioxide in facility environment is designed, which includes main control node, monitoring node and supplementary node, and realizes information exchange between nodes through Zig Bee protocol. The monitoring node acquires multi-point carbon dioxide concentration, temperature and illumination data in real time. The main control node combines temperature with light threshold according to the optimal growth environment of each stage of the crop. Dynamic calculation of the difference between the target value of carbon dioxide concentration and the real time value is used as the control parameter, and the feedback control is used to realize the dynamic control of carbon dioxide. The gas diffusion pipeline in the facility adopts the double M type arrangement and designs the carbon dioxide diffusion holes with different opening sizes. The carbon dioxide emissions of each small area are controlled by the supplementary application node and the convection device to achieve the purpose of uniform and quantitative supplementation. The field arrangement and test show that the CO2 control system based on wireless sensor network can operate stably and reliably. The relative error between the target value and the real time value was less than 3.5 in the area of 36.66 mm2 solar greenhouse, and the coefficient of variation of carbon dioxide concentration between the monitoring nodes was less than 2.93 in the 27.74 mm2 glass-greenhouse, which proved that the system could achieve accurate and uniform carbon dioxide supplement.
【作者單位】： 西北農林科技大學機械與電子工程學院;
【基金】：國家自然科學基金項目(31671587) 楊凌示范區(qū)產學研用協(xié)同創(chuàng)新重大項目(2016CXY-19)
【分類號】：S625;TP212.9;TN92

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本文編號：1786238