Applied Mechanics and Materials Vols. 635-637

Abstract: Swirl chamber diesel engine’s insert piece of channel performance has a great influence on the swirl chamber indoor airflow movement condition. So based on the 175F series bell flat bottom type swirl chamber’s single connection channel improvement, the influence law of swirl chamber indoor air movement during the injection time by the double connection channel angle at the engine rated speed 2600r/min was studied. Simplified boundary conditions to establish its mathematical solution model for the swirl chamber, then the fluid simulation software was used to research the original scheme and double channel with angle of 50 ° and 30 °, 40 °, 60 ° schemes’ swirl chamber indoor air movement. Results show that the angle of 40 ° dual channel form, the loss of the throttle was reduced, and the swirl chamber air velocity increases obviously, the swirl chamber air velocity in injection time up to 125 m/s,which not only increased indoor vortexes energy but also contribute to oil and gas preferably blended, and near the nozzle the temperature lower 20 °C than the original machine, effectively reducing the nozzle heat load.

Abstract: Discussed the key process and referenced method of field information quantitative extraction for maize based on L-system-3D dynamic modeling in the process of virtual plants simulative display, presented the method of field information quantitative extraction for plant simulation, and delivered the effective final validation results. The research can be used to serve for virtual plants display based on Virtual Reality Modeling Language effectively.

Abstract: This article produced virtual reality attractions in Beijing, used in teaching and achieved good results. It conducted in-depth research in framing the attractions, modeling, data compression [1-4]. Based on the reality of a Buddhist temple in Beijing Lama's famous three-dimensional, we constructed a 3D electronic map navigation system.

Abstract: Use the process of dashboard on the solid high-tech 3D numerical control platform of NC machining process as an example, Using UG to establish the machine and parts model, the tool path have been optimized by VERICUT .As a result, enhances the processing speed, shortening the processing time, improve the cutting efficiency, reducing processing cost and making the process has been optimized .Finally, Reliability and optimization results are verified through numerical control platform instance.

Abstract: The mechatronic technology raises a new requirement for the product design process which is both mechanical and electrical design need to be more interactive, collaborative and integrated.. In order to satisfy the requirement, in this paper, a new integrated CAD system has been developed based on the 3d modeling kernel Open CASCADE. The main 3D mechanical and 2D electronic digital design functions are developed and integrated in the system. In addition, the electromechanical parts library, which was built in the system, includes not only mechanical information such as 3D package geometry structure but also electronic properties of electronic components. The circuit logical design can be carried out in the 2D logical design module of the system, and next important electromechanical design process is PCB layout and optimazation with mechanical structure are integrated in 3D environment. At last, an example is shown to illustrate the system, which can support the design of mechatronic products, decrease the interactive work and data exchange between mechanical and electronic information and improve the design efficiency.

Abstract: Most of Shipyards have adopted block construction method. In spite of efficiency, this method has been reported lots of problems. Overlap or gap between blocks, such problems are mainly caused by deformation of blocks. The ship’s block is built by thin plates which are processed by cutting and welding, etc. Deformation of block comes from process of plates by cutting and welding in the stage of block assembly. In the stage of block erection, overlapping or gap occurs between block’s parts which are caused by deformation of blocks. So, block accuracy management is the key point to production efficiency of shipyards. In this study suggests a 3D measurement based Virtual Assembly System (VAS) to solve those problems. This study specified principle function of VAS and implemented to check validity of principle function. Principle function of VAS is analysis of block’s deformation between design and measurement information and performs block erection process with measurement information in virtual assembly space. According to these principle functions, VAS has been implemented with ACIS for 3D geometric modelling kernel and HOOPS for 3D visualization library. Block deformation analysis and virtual block erection has been performed with two ship block to check validity of VAS.

Abstract: Crystal lamp has been preferred in indoor lighting design because of its gorgeous effect of light. Crystal lamp has many same or similar elements in the structure, so using CAD technology can help designers to quickly design and model crystal lamp. In this paper, the planar distribution of crystal lamp has been divided into two kinds of situations such as the concentric form crystal distribution and the rectangular form crystal distribution. Aiming at each situation, mathematical analysis has been done and the pseudo-code been given respectively. Then a parameterized modeling plug-in for crystal lamp aided design based Rhinoceros platform has been developed by using VB language. By selecting the parameters and variables, the plug-in can automatically create 3D model of crystal lamp, thus realize the parameterized modeling and improve the efficiency of design.

Abstract: In the concept design phase of new car development, the parametric simplified side impact model was established by implicit parametric technology. The design parameters of BIW were optimized based on simplified model, such as the shape of section and the thickness of parts. The side impact safety performance and lightweight requirements were set as restraints during optimizing. The case indicated that the intrusion and intrusive velocity of B-pillar were reduced more than 30% and the mass was reduced 5.6% by this method.

Abstract: Researched the virtual-actual integrated technology based on the computer simulation test, 3-D NC test platform was mentioned using ′PC+Motion controller′as the core. In the VC++6.0 environment, the MFC series and the GT motion controller dynamic link library was used to realize multi axis linkage control function and 3-D NC control system software was developed. The “” vector control strategy and the SimPowerSystem module library was used to establish the system simulation of PMSM vector control model, Matlab software and InTouch software were used to realize the virtual simulation and associated debugging for control system and mechanical transmission system, the feasibility of numerical control testing platform was verified .

Abstract: Soil shear strength is an important physical performance of rock and soil, so the soil shear strength measurements play an important role in monitoring and prevention for landslide hazard point. In order to achieve on-site monitoring of landslide hazard points, this article presents a device for field measurement on soil shear strength, The device consists of cross board, torque sensor, stepper motor, single-chip hardware circuit and other components. When measuring,the single chip microcomputer (SCM) control stepper motor to drive the cross board sheared in the soil, through the coaxial plate shear force torque sensor on the cross board to measure the torque signal ,then the torque signals are transmitted to SCM, the SCM for data processing to calculate the soil shear strength.