Wen Lei Sun

3D Scene of Virtual Reality System Design and Research

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.

Static and Dynamic Analysis of Wind Turbine Tower Structure

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.

The Application of Second Development Technology for SolidEdge in Web-Based Parts Library

One of the purposes of building a web-based PLIB is to transform the CAD technology application from isolated environment to network. To realize the main function modules of web-based PLIB system, the object hierarchies of SolidEdge and its Second Development Technology under .NET Platform are studied. And on this basis, the implementation methods of these function modules closely related with the SolidEdge API (Application Program Interface) are detailed, including the dynamic browsing of three-dimensional part model, the online parametric design of part, the information acquisition of part property. At last, an application instance is presented.

Structural Properties Analysis of Composite Wind Turbine Blade

In the process of wind turbine operation, the blade needs to withstand various kinds of loads. With wind turbine power kept getting bigger, the strength requirement of the blades become higher. In order to improve the strength of the blade, lots of new composite materials are use in blade material component parts. This paper studies the geometry laminated structure, external and structural characteristics of composite blade.

Modal Analysis of Three Rotating Blades of Large Wind Turbine

Abstract: Based on the Multi-body dynamics, the dynamics equation of the flexible blade in wind turbine is established by discretizing the rotating blade using finite element method. The simulation analysis of the single blade and the vibration modes of a 5MW wind turbine rotor are carried out by MATLAB. The first six natural frequencies and modes of the single blade and the rotor are figured out, and whose results are analyzed. The simulation results indicates that the coupling effect of the rotor can lead to dynamic stiffening. In comparison to the results in FAST, these simulation results show an outstanding agreement with the results calculated by FAST and hence approve the simulation method is valid and meanwhile give reference for large wind turbine design and running.

Laser Fabricated In Situ (Ti,W)C Multi-Ceramics Reinforced Intermetallic Matrix Composite

Using laser cladding technique, Ni3(Si Ti) matrix composite coatings reinforced by in-situ synthesis (Ti,W)C multi-ceramics were fabricatcd by preplacing Ni78Si13Ti9( at%)powders containing different WC contents on the nickel-matrix superalloy substrate. The phases of coatings were investigated by scanning electron microscopy (SEM), X-ray diffractometer (XRD) and electron probe microanalysis (EPMA). Phases of the coatings mainly composed of Ni3(Si Ti), (Ti,W)C multi-ceramics A chemical reaction between WC particle and Ti powder occurs during the laser process, therefore (Ti,W)C was formed.

Reconstruction of Human Skeleton Model Using Reverse Engineering Technology

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.

A Fine-Grained Access Control Approach for Parts Resource Sharing

To meet users’ actual demands for fine-grained access control (FGAC) to data object in web-based parts resource sharing platform, a FGAC approach for parts resource sharing is proposed to enable both the providers and administrators to manage the permissions of parts resource jointly. In this approach, all levels of detail (LODs) are introduced in the part resource information firstly. Then, a role-based access control model for parts resource sharing, called RBAC_PRS, is provided on the basic of RBAC (Role-Based Access Control) and O-RBAC (Owners-Based Access Control) models, and the permission administration policy is also formulated in condition of the separation between ownership and usufruct of parts resource. To provide the better authorization route, two middle layers: function sets and component sets, are added in permission-role assignment process, and each role’s assignment rules are explicitly specified in an XSLT style sheet. Furthermore, an XML-XSLT based approach is adopted to accomplish the diversity expression of user-accessible view based on FGAC. And it could ensure to practice the web-based knowledge sharing system safely.

Kinetic Analysis of Wind Turbine Blades

This paper using ANSYS software such as wind turbine blades and other key components of the kinetic analysis and research, the kinetic analysis method and finite element analysis software combine to validate the experimental data is reasonable. Specific contents are: wind turbine blade dynamics analysis. The wind turbine blades as slender cantilever, so you can use the ANSYS program flexible dynamic analysis modules. The module is used to calculate the alternating loads flexible body structural response, namely due to the coupling effect of making wind turbine blades load acceleration, deformation at any time are changing. Also changes with time of the blade root of force and torque, the forces and torques of the hub provides theoretical data for further analysis. In this paper, the key components that wind turbine blades for the kinetic analysis, the relevant conclusions. Wind generator system for future scientific design, blades and other key components of the failure prediction assessment provides theoretical support. Wind turbine blades rotate in the movement through the air to promote the flow of the wind energy into mechanical energy, electrical energy eventually [. Leaves the force in the system is particularly complex, by gravity, such as the formation aerodynamic pull, bend and other effects and coupling effects [. Leaves elongate resilient structure is characterized by large-scale, flexible. During operation, the fan blade damage resonance is an important reason, it is how to use the features to reduce structural failure of the fan so that the safe operation of wind power generation is one of key technologies [. Wind force generator is one of the most complex parts blades, due to its tangential short span long, flexible, and therefore prone to vibration, wind turbine blades are a variety of mechanical vibration occurs first site. Therefore, from the wind turbine operation and design considerations for wind turbine blades for stability margin analysis and linear stability analysis are important.

Research on Key Technology of the Simulation Visualization System of the Virtual Wind Farm

From the start of the key technology of 3D model creating, motion simulation, visualization and interaction of roaming, and elaborates the development method of visual simulation system of virtual wind farm. this article achieved that the system not only can realize real-time roaming interaction between participants and 3D simulation system, and can simulate the interaction between the wind turbine and wind field, but also will be the application of VR technology in the dynamic analysis, processing and analysis result, enhance product development from degree and gain a higher level of details.