Papers by Keyword: Virtual Prototyping

Abstract: To understand the problems, which appear in every human joint, it is very important to know the anatomy and morphology of the human bones and the way in which the components are working together to realize a normal functionality.For this purpose was used a CAD parametric software which permits to define models with a high degree of difficulty. First, it was used a CT or MRI device to obtain the parallel sections in the studied component bone. A 3D scanner can be used only for the outer geometry. In the second step, the images were transferred to a 2D CAD software, as AutoCAD, where the outer and inner contours of the bone were approximate to polygonal lines composed by many segments. After this, the contours were transferred to a 3D CAD software, as SolidWorks, where, step by step, and section by section, was defined the virtual bone component. The primary sections can be directly unified in shapes, as Loft geometrical shape, to define the base of the bone. Additionally to this shape can be attached other Loft, Round or Dome shapes. For some components, as vertebrae, mandible or skull bones, it can be used a preliminary model obtained by parallel sections. Starting from this, the model can be defined using the main 3D curves for final virtual solid model.The virtual model of the bones can be used for different simulations for human movements as walking, flexion, extension, rotation, lateral bending. Also, parts of the entire human bone system were be used for implant, surgery and prosthesis simulation, virtual and rapid prototyping.

Abstract: Research how to realize real-time hardware in the loop (HIL) of industry design system by utilizing a variety of virtual reality (VR) hardware and software. In this paper, it introduces VR and virtual prototyping technology, and then proposes joint control and simulation based on ADAMS / Aircraft, Simulink, Flightgear three software. Moreover, the virtual scene, data gloves and real-time semi-physical simulation are analyzed and researched; finally as an example, build a real-time semi-physical simulation platform of the landing gear system for multi-wheel and multi-strut aircraft. The system can do kinematic and dynamic analysis, real-time control by visual prototyping and digital models through real-time data acquisition and co-simulation.

Abstract: As one of the most important examples of human-orientated system, the exoskeleton can improve the strength and endurance of the wearer. The exoskeleton has multi-degrees of freedom. As a result, a stable controller for the exoskeleton is difficult to design. The adoption of a purely positional control strategy may lead to large contact forces. Hence, an admittance control strategy is devised aimed at limiting both internal and contact forces. To verify the rationality and feasibility of the control strategy, we introduce a method utilizing virtual prototype and collaborative simulation.

Abstract: The virtual prototype model is established for the induction station system of the parcel sorting machine. The key problems of the belt modeling and the constraint between belt and bearing are solved. The dynamical simulation analysis of the induction station system is carried out using ADAMS software. Based on the position and velocity changes of the contact point between belt and the parcel, the dynamic performances for the induction station system are gained. This research saves the development costs and time, and provides theoretical basis for working parameter design of the induction station system.

Abstract: Spatial curved blades have been widely used in major aerospace manufacturers due to their light weight, high structural efficiency, high reliability, etc. However, their processing deformation, processing difficulty, and so on limit their use. In order to deal with the situation, flexible multi-point auxiliary supporting fixture for the processing of spatial curved thin-walled parts has become a major topic of current researches. The layout of positioning and clamping points of the flexible multi-point fixture direct affects the stiffness of clamping positions on the thin-walled parts to be processed. When cutting force is definite at a certain point in machining, the greater the stiffness at the processing positions on the part, the smaller the processing deformation due to the cutting force. Therefore, in order to reduce the machining deformation due to the poor stiffness, a suitable positioning and clamping layout is needed to improve the surface stiffness at the machining positions. Thus, the machining quality of thin-walled parts can be improved.

Abstract: To obtain realistic dynamic characteristics of the lifting mechanism, the liftarm and drawbar were regarded as flexible bodies. The modal neutral file (MNF) of liftarm and drawbar were obtained from modal analysis conducted by finite element analysis (FEA) software MSC.Patran/Nastran . Then the MNF were translated into ADAMS, a rigid-flexible coupling model of the lift mechanism was built by replacing the rigid bodies with MNF. The forces of each hinge points in the rigid-flexible system, which were obtained from dynamic analysis, were compared with the rigid ones. The results showed that forces obtained from the rigid-flexible system were smaller than the rigid ones, which provided a reference for the design and improvement of the lifting mechanism.

Abstract: This paper presents an integrated platform, based on collaborative environment, which can improve the design and prototyping activities. Collaborative activities in supporting product development and design during all product life-cycle, needs a Digital Factory framework. Demonstration of prototyping in real-time where are available changes in geometry, constraints, or other parameters can be based on virtual and augmented platforms. The mechanical and non-mechanical design needs, or any other virtual experiment can be experimented in virtual laboratory where researchers located in different geographical zones, can work on the improvement of product, by sharing resources and research results. Key words: Collaborative platform, virtual prototyping, virtual laboratory, conception, business strategy

Abstract: Cantilever is a key component of Mine Hydraulic Grilled Slag Machine and also is an important bearing member. Parametric analysis and optimization calculation should be done to meet the requirements of its strength and rigidity. It can reduce weight and stress concentration, which makes its structure size more reasonable. With the aid of Solid works 3D modeling software, people can create the working device model. Importing adams to create its virtual prototype model to make dynamics simulation analysis and draw variation graph of key points during its working process to lay the foundation for the finite element analysis.

Abstract: In the drive of market demand, postpress equipments developing rapidly. Because of environmental protection and energy saving, pre-coating technology has broad application prospects. But in China, the design of the machine are mostly generic and doesnt have a set of perfect design theory. There is no design innovation from the source. Using virtual prototype technology, the structural design of the key components of the pre-coated laminating machine to the paper feed mechanism is improved. Through the three-dimensional modeling, assembly and disassembly, adjustment mechanism simulation, motion simulation of mechanism, the physical, mechanical performance analysis, simulation, prediction, realizes fast implementation and optimization design, improves the processing and assembly technology.

Abstract: Vertical planetary mill is a kind of efficient grinding equipment. Due to its unique design, the materials can suffer combined effects of squeezing, shearing and grinding. this paper developed the virtual prototype of vertical planetary grinding wheel sand reclamation equipment based on virtual prototyping technology, and did the dynamic simulation with this virtual prototype. It will use ADAMS to do the dynamic simulation, and it can provide reference price for staff.