Optimization On Environment Parameters And Design Of Adjust Technology Of Greenhouse Environment Based On MATLAB

The facility agriculture is a basic feature and inevitable trend of agriculture modernization.As a high-tech industry,it is an important technical measure to provide fresh products in all countries in the world.With social progress and technological development, facility agriculture has become a pillar industry in national economy.However,for a long time,how to improve production conditions,regulate and control greenhouse environment, minimize the energy consumption,improve energy efficiency and production efficiency has been a key problem of greenhouse industry development.Based on comprehensive analysis of facility agriculture and references,the experiment factors that affect greenhouse environment was conducted.Optimum parameters(temperature,relative humidity,light intensity) of microclimate system were studied,and the environment parameters that affect evaluating indicator of tomato in greenhouse were optimized.Based on Experimental study of the effect of facility conditions on environment parameters,conditions of greenhouse were improved. The regularity of soil moisture dynamics for greenhouse microclimate under the drop irrigation were studied.With the help of regularity mathematic models was created,and the drop irrigation was designed.Taken tomato and cucumber as sample,contrast experiment of economic optimization were studied.Main research results of the study were as following:1.Based on single factor experiment,the different factors such as light intensity, temperature,relative humidity and so on,influencing tomato root,stem,leafage,dry weight and fresh weight of fruit,and the growth of tomato,were analyzed systemically in greenhouse environment,and the main parameters and interval were determined in this paper.2.Base on the method of general rotatory combination design quadratic regression,the experiment about the influence of parameters of microclimate(temperature,relative humidity, light intensity) upon the greenhouse fresh weight,dry weight,input/output of tomato were conducted during fructification,and optimum parameters of microclimate system were studied in this paper.The parameter optimizations have reached under optimization objective. Based on the test,the functions of fresh weight,dry weight and input/output were deduced in this paper.This model integrates the analytic hierarchy process method,entropy method and mean-variance method,and proposes a subjective and objective weighting method,which can not only reflect the objectivity and subjectivity of evaluation but also improve the reliability of weights.Based on MATLAB,multiobjective optimization of greenhouse environment parameter was put forward.By slice of three-dimensional produced four-dimensional images that expressed functions with changing in color.The optimization results show that the optimized combination of factors is temperature 23.9℃,relative humidity 79.6%and light intensity 71klx when optimum objective function,optimum solution is f~*=59.5.3.The different conditions in greenhouse that impact on greenhouse environment and the altering regularity of factors of environment were studied.The influences of different covering materials,inside thermal screen and irrigation of different methods on environment inside greenhouse were studied,so facility conditions and design were conducted.With the application of creation of mathematics models,parameters for greenhouse environment were simulated by MATLAB and measured curve.4.Hardware design of greenhouse fuzzy control system applies fuzzy control theory and method.It determines overall circuit structure,system hardcore section,expansion and configuration section,selection of right sensors and control chips included.Software design of greenhouse control system selects language C to program,it's readable and easy to update, meanwhile adopts modular programming method,each program module is mutual independent,the software has the advantages of extendibility,easy maintenance and high reliability.5.Experimental study was conducted that affect economic optimization in greenhouse cucumber.The influence of parameters of microclimate(temperature,relative humidity,light intensity) upon the greenhouse input/output and optimum parameters of microclimate system were studied in this paper.Using variance analysis to make significance test of input/output of tomato and cucumber,difference are significance on the 5%level,which can be adjusted facilities to improve input/output.