Study On Virtual Experiment System Of Lateral Move Sprinkling Machine Based On Multigen Creator/Vega

This project was supported by"11th Five-Year"National Science andTechnology Support Programme project"agriculture equipment virtual testtechnology (Project's number:2006BAD11A1706). Traditional LargeIrrigation System Test need not only site,water, and power fitting for tesrequirements but also installating, debugging the irrigation equipment. The tesdata is finally calculated through measuring the spraying depth repeatedly. Thismethod is difficult,water-wasting and time-consuming etc.Lateral movesprinkler irrigation's virtual experiment system based on Multigen Creator andVega,which is simulated in computer by virtual reality technology, has createdand optimized mathematical model.This simulating experiment not onlyovercame the deficiency of traditional irrigation test and save resources, reducethe cost, improve efficiency and protect water environment.The main work of this paper is as follows:1. The present research progress of lateral move sprinkler irrigation'ssprinkler test technology is reviewed and overall planning and technologyroute of virtual test system about Lateral move sprinkler irrigation based onMultigen Creator and Vega is created in this paper.2. The method of establishing and rendering the models in the virtuareality system is researched. The 3D model of lateral move sprinkler irrigationis established. The terrain model is created and optimized using the LODterrain hierarchy and polymesh algorithm.The virtual realistic scene about thesprinkler irrigation is set up by texture maps.3. Based on analyzing the lateral move sprinkler irrigation's workingprinciple, structural parameters, motion parameters and so on related toirrigation uniformity, a mathematical model for calculating the sprinklerintensity of a single sprayer is established.4. Sprinkler uniformity(Cu) is an important indicator to evaluate thequality of sprinkler irrigation.A algorithm of sprinkler uniformity based onvirtual experiment technology is brought out and the interface of sprinkler uniformity machine parametric model is developed.5. Data structure of water droplets is defined and the conditions of the sprinkler water droplets'produce, growth and disappearance is installed based on the theory of particle system in this paper. Irrigation of sprinkling machine is shown in the virtual environment by calling the OpenGL graphics library functions and the callback function. Users can observe and know the process of virtual test.What's more,users can interact with virtual prototyping by computer.6. The water distribution model of lateral move sprinkler irrigation in no wind conditions is established through the analysis of irrigation's working process. With the use of Microsoft Visual C++ 6.0, virtual sprinkler irrigation test system is developed in this paper.For the example of PY10-type nozz -le,many simulating test is done.The main innovation of this paper is as follows:1. It is the first time to develop a computer-aided system of sprinkler irrigation aiming at uniformity, This system used to calculate the sprinkler irrigation uniformity under conditions of different nozzle distance and different nozzle diameter.2. the calculation model of sprinkler irrigation's sprinkler intensity is more improved in this paper which plays an important in exploiting parametric model interfaces of sprinkler uniformity.