亚洲一区欧美在线,日韩欧美视频免费观看,色戒的三场床戏分别是在几段,欧美日韩国产在线人成

The front roof is an important part of realizing the communication between the internal and external environment of the Chinese solar greenhouse (CSG). The internal environment of CSGs is controlled by the state of the front roof covers in actual production. Three important covers (insulation quilt, transparent film and colored mesh) are laid on the arc-shaped front roof to control the internal environment factor of CSGs, such as the light, temperature and humidity. The rolling and laying of three covers usually rely on the common front roof structure surface. Due to the coincidence of action trajectory range and operation methods, there are problems that interfere with each other and lead to the low degree of automation in the actual production. It is also not conducive to the systematic and intelligent control of CSGs. According to the functional requirements of the three covers, a coordinative operation device was designed. The main research content included two hardware parts (the outer operation structure and the inner operation structure) and their coordinated control method. The specific corresponding transmission structure and the position detection method of covers were emphasized. The key points of this research were verified by experiments of the scaled model and field CSG. The experiments result of the scaled model showed that the mean relative error (MRE) of different opening values of three covers was less than 3.5%, the root mean square error (RMSE) was less than 2.0%. The value of coefficient of variation (CV) of the device was less than 3.0% at each opening point. The outer operation structure also showed good control accuracy and stability in the field experiments, the MRE was less than 2.5%, RMSE was less than 1.26%, and the CV was less than 1.0%. The overall measured experiment results of the scaled model and field CSG showed similar changing trends, which verified the model experiment results and the implementation feasibility of the overall designed device. The research provided a theoretical basis and systematic technical support for the operation of three covers, which was of great practical significance to the automation and intelligent development of the CSG.