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首页> 外文期刊>Journal of Cleaner Production >Precise measurements and control of the position of the rolling shutter and rolling film in a solar greenhouse
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Precise measurements and control of the position of the rolling shutter and rolling film in a solar greenhouse

机译：精确测量和控制日光温室中卷帘和卷膜的位置

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摘要

Against the background of the depletion of fossil fuel energy sources and environmental degradation, solar greenhouses represent an efficient and sustainable agricultural production method in China. The precise measurement and control of the position of the rolling shutter and rolling film is not only one of the core issues in the modification of the greenhouse environment in actual production but also the basis for improving the cleaner production efficiency of solar greenhouses. In this study, a mathematical algorithm for the control of a rolling shutter and rolling film was developed and is based on the simplification of the circular arc of the greenhouse surface. The "Liaoshen-IV" solar greenhouse was used as an example to illustrate the calculation steps of the algorithm. Any position on the light surface can be determined by calculating the angle at the bottom of the back wall of the greenhouse so that the position of the rolling shutter and the rolling film can be measured accurately by the angle sensor. Experiments using a scale model with one or two surface segments were conducted to demonstrate the advantages of the control algorithm with regard to the accuracy and stability compared with the existing control method of a time-delay relay. The relative errors of the control algorithm were stable and less than 1%. The use of the algorithm improved the control accuracy of the rolling shutter and rolling film and the average relative error was reduced by 6.37% in the first stage and by 3.40% in the second stage compared with the time-delay relay. The precise measurement and control of the position of the rolling shutter and rolling film in a solar greenhouse demonstrated in this study has great significance for practical applications. The proposed method may result in a reduction in energy consumption and greenhouse gas (GHG) emissions in greenhouse environments, thereby contributing to the improvement of resource efficiency and a cleaner production. The study also provides application examples and theoretical references for the automation of rolling shutters and rolling film in greenhouses worldwide. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在化石燃料能源枯竭和环境退化的背景下，日光温室代表了中国一种有效且可持续的农业生产方式。卷帘和卷膜位置的精确测量和控制，不仅是实际生产中改变温室环境的核心问题之一，而且是提高日光温室清洁生产效率的基础。在这项研究中，开发了一种控制卷帘和卷膜的数学算法，该算法基于温室表面圆弧的简化。以“辽深四号”日光温室为例，说明算法的计算步骤。可以通过计算温室后壁底部的角度来确定光表面上的任何位置，从而可以通过角度传感器精确地测量卷帘和卷膜的位置。进行了使用具有一个或两个表面段的比例模型进行的实验，以证明与现有的延时继电器控制方法相比，该控制算法在精度和稳定性方面的优势。控制算法的相对误差稳定，小于1％。与延时继电器相比，该算法的使用提高了卷帘和卷膜的控制精度，第一阶段的平均相对误差降低了6.37％，第二阶段的平均相对误差降低了3.40％。这项研究表明，精确测量和控制日光温室中卷帘和卷膜的位置对于实际应用具有重要意义。所提出的方法可以减少温室环境中的能源消耗和温室气体（GHG）排放，从而有助于提高资源效率和更清洁的生产。该研究还为全球温室中的卷帘和卷膜自动化提供了应用实例和理论参考。 （C）2019 Elsevier Ltd.保留所有权利。

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