The Development And Research Of Analysis And Design Software For Precision Seed Metering Device Based On Re_development Of AutoCAD

In the course of engeneering design,computer as a aid tool is oftern used to help the designer to design product.The application of CAD have greatly improved the ablity of enterprise's development.But most softeware of CAD is for the genneral design.There is no help when they meet some profession design.This paper firstly presented re_development of AutoCAD and develop a pre_modual to deal with the drawing file. Integrated with the pre_modual,we develope an emluator and analysis software.Then .We can get a design system which can emluator work of engine components to help the designer analyse the design parameter and modify sketch map.Then when the design was made be real componnents,it can reduce the times of experiments and improve the design efficiency.This system mainly consists on before-treatment dealing sub-system, after-treatment dealing sub-system.The after-treatment dealing sub-sub system is splitter two modual.One modual is for DEM calculating;The other modual is deal with the emluator and analysis. It uses Visual C++6.0, ObjectARX and AutoCAD as the development tools. In order to be more convenient to expand the systematic function further, every sub-system is developed based on orient-object method. Among them dealing sub-system and DEM calculating sub-system relied on the database to transmit the data, and DEM calculating sub-system and after-treatment sub-system's integrating are realized by writing and reading the same datum file.The before-treatment dealing sub-system is a re-development utilizing ObjectARX2000 to carry on under the environment of AutoCAD2000. The main purpose is to distill the drawing which the designer designed with AutoCAD, and sets up the movement way in the course of calculating in emulation of every figure element (such as a line segment, a section of arcs), set up the emulation models of " the element of the figure plus movement way ", and store the model in the database, support DEM calculating that sub-system is used.The DEM calculating modual calculates receiving- strength situation and sport situation of agricultural machinery part with agricultural particle materiel, particle materiel with particle materiel. Users can choose the analysis model which is wanted to calculate in the figure database, and then according to the characteristic of supplies choose different mechanics model and input the relevant parameter, utilize DEM algorithm to calculate out dispersed sport orbit, receiving-strength situation, and write down the information in the form of files. This sub-system adopts multiply document, multiply thread technology, can not merely calculate a lot of analysis models at the same time, but also provide stop calculating, continue calculating function, make users can watch the result of emulation ahead of time, but needn't finish calculating after all.The after-treatment dealing modual shows the dynamic emulation data in the form of figure while the DEM calculating finishes or after, and offer the function of quickly putting, slowly putting, suspending, stopping etc.The research of this text has heavy meaning for improving the accurate research and design level of precision maize seed metering device, reducing test links and experimental times, reducing unnecessary loss in working course and improving performance.