Applied Mechanics and Materials Vols. 501-504

Abstract: Boltzmann variable is introduced as an intermediate variable in differential transform method (DTM), and an approximate analytical solution is presented about the Brooks-Corey model in Richards equation, which governs the problem of unsaturated flow in porous media. Compared with experimental data of Hall's mortar and finite element method (FEM), the results show highly accuracy in intermediate variable method.

Abstract: In the analysis of the GOCAD SGrid model and the FLAC3D hexahedral mesh model, a method of converting the former to the latter is proposed, and the data conversion program is prepared based on VB.NET. The purpose of building complex models in FLAC3D quickly is achieved, and the FLAC3D simplifies the pre-processing largely. Finally, the feasibility of the method is verified by a practical project.

Abstract: Based on some kind of transfer robot, conduct virtual assembly and kinematic simulation analysis on transfer robot by using NX software, thus to instruct the practical assembly and control of the robot. Analyze the poor movement stability of robot, point out its flaws of inertial impact and short rigidity. Conduct structural analysis on the original model by using NX software, verify the analytical conclusions, and carry out structural optimization design on the model to improve the products structure.

Abstract: A method of automatic drawing and dimensioning for hydraulic flat steel gates, which determines the projection of 3D model and data in two-dimensional space by data graphic method, which orientates by local coordinate system, which automatic dimensions by Brep and location dimension, is presented. Automatic drawing program is written by VB.Net and C# on Inventor API, which can be directly used to practical engineering.

Abstract: The 3D visualization design of steel structure under the CAD environment needs to work in the global coordinate system (WCS), but design of various steel members in the 3D space must be completed in the local coordinate system (UCS), so it is perplexing for the conversion and calculation between UCS_i (i=1,2,3....n) and WCS. It is proved that the maize grains are not polluted and food production is in safe condition. The article describes classification of several common coordinate systems, discuss the method of setting up coordinates system. Describe the process of type convertion of coordinate system in steel structure design and detailing softwares, and explained the advantage of the application in the real world project.

Abstract: The workflow of traditional steel often causes the lack of information, and the high cost, reduced efficiency in the various stages of the project. BIM technology simulate building by digital real information, share the information by central document, that close connection with the various stages of the process, and exchange information, so as to improve efficiency and reducecosts.Based on the concept of Building Information Model, the article explains the design and construction of 3D SteelGate software system. By adopting the Object-Oriented Design model, the article established parameterized database used for model construction in steel constructions. Article also describes the application in steel design software with the help of design model, analysis model and the drafting model.

Abstract: Using VRML virtual reality modeling language standard steel structure CAD graphics switch into a text file. Making the complex 3D graphics information expressed in VRML environment. Make CAD graphics and VRML file according to the respective standards can use inverse. Drawings transformed into each other to create a practical and effective method.

Abstract: The classification of the main structure is introduced in Hydraulic flat steel gates intelligent design system, shape parameters, attributes parameters and constraints forms of basic components are established, and method of collection, storage and extraction of associated information in related components is invented. Grid line is selected as the skeleton-driven to make all components associated. The methods above-mentioned are used to construct the intelligent design system of Hydraulic flat steel gates, which is built on the Autodesk Inventor, and in which the computation, modeling, automatic detailing are combined, and which has broad application prospects after successful application of certain steel gate design project.

Abstract: A kind of parallel driven swing platform with 3-DOF of rolling, pitching, yawing was introduced in this paper. It could be used to simulate the spatial position character of the airplane or airship to test the APT performance of the laser communication terminal. This kind of platform had the merits with brief configuration, small cubage and mass, big equipment fixing space, especially suited for the outdoor test application. We analyzed the motion relationship of the platform with the inverse kinematics solution and protracted the curve. Meanwhile, the ADAMS was applied to simulate and measured the mechanism, and yielded a same result.

Abstract: Mainly introduces the theory of equivalent viscoelastic artificial boundary and the corresponding parameters of the formula, as well as the equivalent viscoelastic artificial boundary implemented in ANSYS software, and verified by an example of its good accuracy.