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Research On Key Issues In The Development Of Sugarcane Harvester Based On Visual Virtual Design Technology

Posted on:2004-02-12Degree:DoctorType:Dissertation
Country:ChinaCandidate:Y M MengFull Text:PDF
GTID:1103360092992761Subject:Mechanical Manufacturing and Automation
Abstract/Summary:PDF Full Text Request
Development of sugarcane harvester used in hill is an urgent research task. The virtual design technology is an advanced product developing technique in 21 century, and it is effective on developing sugarcane harvester as soon as possible, however there is no research report about the virtual design technique used in the development of sugarcane harvester at present. In the dissertation, the visual virtual design method was used to provide support for sugarcane harvester development. First, the collectivity frame of design sugarcane harvester was analyzed, and the integration design platform was built using product data management (PDM) software to integrate CAD, CAE and expert system etc. so that developing product process could be effectively organized, controlled and managed. Secondly, the design method about sugarcane leaf cleaner was studied. The optimum design of cleaning element, which was key part of the leaf cleaner, was carried out based on the numerical value simulation orthogonal experiment. A virtual experimentation platform used in analysis, optimum and fatigue life for cleaning element also was developed. It is a good tool of analysis and series design for cleaning element. Main study and creative work included the following parts:(1) The whole design frame of sugarcane harvester used in hill was put forward based on the prophase work and visual virtual design technique at present. First, according to growing and harvest characteristic of sugarcane, Requirement and function of sugarcane harvester was analyzed, and its whole plan was present. Secondly, several main parts were designed; their numeral models were built; simulation of kinematics, dynamics, FEA, electronic and control system about parts was carried out with CAE software so that the optimal plan and parameters of parts were found. Finally, these parts were assembled; numeral prototype was obtained when analysis, simulation and optimization were repeated and main parameter adjustment was also done with experiment, so design efficiency and quality was greatly improved.(2) Because development of sugarcane harvester used in hill was particular and complex, and there was no the support system for the whole process of developing product at present. The fundamental thought to build the intelligent design platform of virtual visualization for sugarcane harvester was proposed. The platform was based on the product development share model developed by Standard Exchange of Product Model (STEP), and applied PDM system tointegrate and encapsulate CAD, CAE and other applying software used in the product development. The platform also integrated the expert system of sugarcane design, analysis and evaluation. This expert system utilized fuzzy evaluation principle to evaluate the design and simulation analysis results and make decisions. In order to manage, organize and control process of developing product, process management model, produce model and product structure configuration of the sugarcane harvester were built based on the developing flow. The design platform provided the collaborative intelligent environment for the design of virtual sugarcane harvester prototype.(3) According to function requirement of the leaf cleaner, whole plan of the cleaner was decided elementally when the moving mechanism of leaf being striped from sugarcane was analyzed. The cleaning element is the key component of sugarcane leaf cleaner, and its different installation way would directly affected to the cleaning leaf quality and element life. The hitting force produced in work process of the leaf cleaner and maximum stress that cleaning element in brush shape was subjected on its root was elaborated based on theory and FEA analysis, and the results were validated using experiment.(4) The optimum design of cleaning element is an optimization problem of the multi factions and multi targets. The virtual orthogonal experiment method was used to calculate hitting force and bearing stress on cleaning element; experiment results were anal...
Keywords/Search Tags:sugarcane harvester, visual virtual design, system integration, product information model, leaf cleaner, cleaning element, optimum design, numerical value simulation orthogonal experiment, fatigue analysis
PDF Full Text Request
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