Papers by Author: Wen Lei Sun

Abstract: The use of virtual reality technology on the objective world visualization and simulation, can provide the user some information hidden behind the data and realize humanized man-machine interaction. Based on the virtual reality system design process, classification, key technology and application areas of exploration, can grasp and understand the realization of virtual reality system design and development of the basic principles.

Abstract: The pumping unit is designed and assembled collaboratively by using virtual reality technology combining with the UG and VAPlatform. A simulation roaming system of the field scene is established which uses Nvision platform and 3Dmax. The system is based on the real working condition to enhance the sense of reality, uses interactive roaming mode, observes the objects in the virtual environment from any point of view, and reproduces the working state of the pumping unit in the oil field, which provides reference value for the complex mechanical production.

Abstract: For the development of Chinas cotton picker, this paper focuses on researching the level of spindle-type cotton pickers principle and the law of motion. It established overall model of motion simulation and got the contour in the motion simulation module, then extract the line data and make data processing on the basis of the MATLAB, making reconstruction in the three-dimensional modeling software through applying function expression derived from Matlab. In the motion simulation module, getting the displacement, velocity and acceleration curve charts and discussing their analysis, so as to provide the well-reference value for research law of motion in the pick roller of cotton picker.

Abstract: The system produces strenuous vibration when the wind turbine is operating, it will be a great impact on running precision and components’ life of the whole system, the theoretical study of the research of wind turbine’s vibration is incomplete because of the complexity of the wind turbine’s structure and operating environment, as well as the difficulty of theoretical analysis. In this paper, the FAST established dynamic model of wind turbine, and preliminarily study the establishment of the wind turbine drive system model with multi-body dynamics software, finally dynamic response have been analyzed that based on the establishment of whole wind turbine model, which laid the foundation for wind turbine dynamic characteristic and the system’s optimal design.

Abstract: For the reconstruction model of medical image data has necessity and importance to the medical application and research, a variety of methods to reconstruct human skeleton using reverse engineering technology were introduced. One human bone and one femur were reconstructed respectively using the different methods according their different data resource and rconstuction purpose. The output proved the validity and feasibility of the different reconstruction schemes.

Abstract: Regulating diameter-variable moment pumping unit as the research object. which been analysed by virtual prototyping technology, by this way, the application ways and realization means of virtual prototyping technology is explored in this field.The virtual prototyping technology is introduced into the dynamic characteristics analysis and optimization for pumping units, and the 3D CAD software, multibody system dynamics analysis software and finite element analysis software were combined. The digital physical prototype for pumping units is established by UG software; ADAMS was Used to establish the function virtual prototype and virtual test system, to develop the test analysis and optimize its structure parameters according to the movement requirements for pumping units; The finite element analysis of the pumping unit parts is processed in the ANSYS environment, and structural design is optimized in accordance with the stress distribution characteristics of pumping components. In this paper, CAD and CAE technology are used with close combination, the pumping units dynamics analysis and simulation is developed from the systemic perspective. The research has the characteristics of high precision analysis, wide range of applications and good practical value.

Abstract: The Manufacturing Grid domain is characterized by rapid and substantial change over time. The entire process of product development can be quite complex. The activities are expected to be executed on heterogeneous resources which are geographically distributed. However, traditional modeling systems use static workflow models which can not automatically redesign the business process and mask the isomerism of the resources. In this article, an open and extensible framework of MG workflow is given, which complies with the standard of WFMC and GGF. A formalized definition workflow model is proposed including process model, organization model, resource model, and service mode. The integrated workflow model can be used to dynamically represent a business process and other aspect s of Manufacturing Grid workflow.

Abstract: This paper presents static and dynamic analysis of tower structure supporting a 600KW wind turbine based on the theory of FEM. According to the static and dynamic characteristics of tower structure, the works about simplified models and confirming loads and boundary condition are discussed. In static analysis, under different work conditions the load bearing capacity of tower structure is analyzed with door opening in different directions and without door opening. In dynamic analysis, in order to address the impacts of the foundation on structure, the research discusses the natural frequency and eigenmode from the first sixth modes at the assumption of fixed base and the elastic subgrade. Comparative studies have been performed on the results of the above analysis and some useful conclusions are drawn pertaining to the effectiveness and accuracy of the various models used in the work. Our research work lays a solid foundation of the further static and dynamic analysis.

Abstract: The algorithm to obtain intersecting lines from section and equidistance surface is one method of resolving the problem of obtaining NC machining procedure from points cloud data. As far as cutter paths obtained by section method are concerned, if intersecting lines using tangent plane and processed curved surface are obtained directly, it will be a quite complicated process and lead to divergent iteration operation because of inconsiderate design algorithm, and therefore it leads to the failure of obtaining intersecting lines. So the method of obtaining intersecting lines from section and equidistance surface is adopted. And this paper put forward and has realized one new algorithm. The calculation is simple and the algorithm is stable. It avoids the interference of cutting tool paths.

Abstract: RE is the generic name of a series of technical methods that convert physical parts into engineering concepts and CAD model. It has been an important branch of modern design methodology. With the development of computer and graphic design, RE has already no longer met the simple imitation products, but product innovation based on physical parts. In order to redesign the CAD model constructed by RE method and then support product innovation, hybrid CAD modeling method and some related key techniques are studied in this paper. Combining conventional design and RE, Hybrid CAD modeling method extracts features, constraints, and design intent from measured data for parametric redesign and eventually completes CAD model.