Advanced Materials Research Vols. 712-715

Abstract: The 316L stainless steel stent was analyzed about the effect on interaction with plaque and vessels and blood flow during and after implantation using finite element method (FEM) and computational fluid dynamics (CFD). The results showed that tilted ends are likely to damage the intima which may stimulate thrombus formation and neointimal hyperplasia and will cause the restenosis. Stagnant zones formed by the stent may cause the backflow phenomenon, which also contribute to the important elements of in-stent restenosis (ISR).

Abstract: A great change in mechanical industry has occurred after several successful practices using MBD (Model Based Definition) of The Boeing Company. It is an inevitable trend from two-dimensional product definition to three-dimensional product definition in mechanical industry. Several standards for MBD have emerged around the world. This paper explores the non-revolved parts modeling methods based on MBD and Pro/ENGINEER, presents several key steps about full-annotated model per MBD and then makes a conclusion. Following these methods we successfully build a typical non-revolved model which conforms to MBD standards correctly and efficiently.

Abstract: This paper uses cone cutting line method and plane curve generation method to study the cone section and plane expansion method, establish the transformation of different form curve. This paper analyzes bounded cone section characteristics and components of graphic design methods, combined with specific models, gives cone component integration design and production methods.

Abstract: In order to explore the application of the object-oriented theory in the analysis phase of the gantry crane CAD system development, the OOA modeling method is used to establish the system model and the detailed process guide and engineering strategies of modeling activities are presented, eventually a OOA model of the system is established and a foundation is lay for the subsequent OOD and OOP of the system.

Abstract: The developed BIM-based integrated design software system is composed of two seamlessly integrated modules: structure calculation module and post-process module, the interface between the modules is clear. Using object oriented programming technology, a series of intelligent solid classes are abstracted to describe parts with deferent geometric information, structure properties and design requirements in real structure. Objects which are instances of these hierarchical C++ classes and logical links between them were integrated into the AutoCAD drawing database to construct a three-dimensional model. Several key functions including parametric shortcut modeling, frames analysis and member checking, three-dimensional solid construction, node design and editing, and drawing are implemented. IFC interface and the interface with common software are also implemented.

Abstract: The parametric design and second development flow of panel furniture are analyzed based on Pro/E and modular design method. It created manage database of panel furniture based on SQL2000 and ADO technology, it analyzed synchronous development mode of Pro/TOOLKIT, menu design and DLL dynamic link library development were talked, the parametric design system of hall cabinet, bedside cabinet and wardrobe under VC ++6.0 development environment was developed. Throng example program verification, the method is feasible; it can rapidly finish panel furniture models, and improve the designer's working efficiency.

Abstract: The paper has modeled and simulated the combustion process of big bore CNG engine by three-dimensional simulation software AVL FRIE. Based on test validation in the model, the effect on position of the dual spark plug for cylinder initial flame kernel development and flame propagation process was researched. The results showed that: When A=0.5, the flame propagation distance shortened by half, a certain intensity of turbulence formed when the compression stroke ended, the combustion speed was the fastest, the combustion duration was the shortest. If dual spark plug spacing is too small, the two flames meet prematurely will cause interfere with each other, and reduce the combustion speed of the overlapping region of the flame surface, increase the heat losses. Otherwise,if the distance is too large , close to the combustion chamber wall, the combustion space is narrow, the flame propagation space is restricted, then flame development is slow.

Abstract: The numerical simulation method is adopted to calculate the flow field of the secondary throttle choke used in the oil field. The relationships among the flow of the secondary throttle choke, differential pressure and diameters are studied. The results of numerical simulation coincide with the experiment values, which verify that the method is correct. The results show that the flow increases with the increasing of differential pressure of the throttle choke at both ends, but the increment of the flow gradually decreases. The structure could maintain the flow not to change basically when differential pressure change in a certain scope. When the throttle diameter turns out to be small, the flow decreases, and flow-pressure curve gradually becomes aclinic. Compared with the first-class throttle diameter, the second-class throttle diameter is the main factor which effects flow changes.

Abstract: The kinematics and dynamic analysis of the large-displacement motion simulator is analyzed and derived in detail. By using MATLAB program, the simulation curves of the derived kinematics and dynamic formula match to the practical situation. Our result will provide the theoretical direction for the further study of the large-displacement motion simulator.

Abstract: The article has analyzed the changes of temperature of different materials of the spindle, and considered 170SD30 Ceramic Motorized Spindle and the same model Metal Motorized Spindle as the research objects, analyzed the inside heat source and heat transfer mechanism of the high-speed motorized spindle; used finite element software to set up the model of the motorized spindle, and did simulation and analysis. Verified by simulation, heat transfer rate of ceramic materials is slower than the metallic materials, in actual operation of the process, due to different materials have different heat transfer rate, so the temperature distribution of the different materials of motorized spindle are different. This conclusion provides the basis to solve motorized spindle temperature field distribution.