Papers by Keyword: Finite Element Calculation

Abstract: A review of a three-dimensional finite element calculation for a non-stationary heating regime of a compound structure with a complex shape. The accuracy of thermal processes modeling is determined. The temperature fields for the wind power plants blade elements have been determined at the stage of their manufacturing, which made it possible to identify the characteristic features of the technological process for these structures production.

Abstract: Longxi Tower translocation project is the first case of high-rise ancient tower structure translocation on soft soil foundation in China. Foundation treatment protocol and building materials are essential to control soft soil foundation settlement. Depending on Longxi Tower translocation project, firstly this thesis analyzed and confirmed control factors that impact foundation settlement and deformation; then combing with project experience, it selected cement soil mixing pile composite foundation method to treat soft soil foundation; and finally it confirmed the optimal solution to treat cement soil mixing pile composite foundation through analyzing the settlement law of cement soil mixing pile composite foundation. The analysis indicated that cement soil mixing pile composite foundation settlement are obviously impacted by translocation speed and retention time; foundation settlement and deformation level increase as translocation speed decreases and retention time increases; in the case that foundation settlement difference is not beyond 1/1000 of half the distance of track beams at the bottom of building, a treatment solution was made by analyzing how cement soil mixing pile settlement changes as translocation speed, retention time and other factors. The result showed that this treatment solution saved 42% of project cost more than the previous design solution. The research result of this thesis could be taken as a reference for the future similar projects.

Abstract: The square and hexagonal honeycomb materials were studied by finite element simulation of tensile test in order to calculate the elastic modulus in tension under different porosity and to analyze tensile properties affected by the pore shape of honeycomb materials. Research results show that the tensile elastic modulus of the square honeycomb is larger than the hexagonal honeycomb. The reason is that the square structure has a larger stiffness than hexagonal structure. Also, the equivalent elastic moduli of calculated values are higher than the theoretical values, because the finite element model is based on solid elements while the theoretical model is based on the Euler beam.

Abstract: Proposal the medium filling scheme of LNG tank container impact testing that filling the tank with water which mass is equal to dangerous goods, since the medium filling scheme before is difficult and loss, by finite element calculation with ANSY to the stress of LNG tank framework in the actual conditions and test conditions. Studies show that the two conditions of the tank is similar, test conditions can simulate the actual filling conditions. Applying this conclusion to the impact test, which can greatly simplify the test procedure and reduce the difficulty of the test, the test can be enhanced operability and economy.

Abstract: Geometry modeling and meshing are directly related to the effectiveness and accuracy of the finite element calculation. In order to improve above two key technologies, small size ferromagnetic objects on the ship deck are simplified, and the parametric idea is introduced into the ship model meshing. A typical ship model is set up on the platform of software FLUX. The above improved technologies are tested in FLUX in the earth magnetic environment. The experimental results show that the simplified modeling can greatly reduce the amount of calculation, and parametric meshing can effectively improve the computational efficiency, which proves that the above improved method is an efficient method for the finite element calculation of the ship magnetic field.

Abstract: With gradual increase of requirements for comfort and living environment,braking noise has become one of the issues concerned by people. The research and control to noise has become focus on designing and making braking systems. Based on associated test techniques and analysis theories, the corresponding test, spectrum analysis and coherence analysis are conducted, information about the noise and frequency spectrum is obtained; three-dimensional modeling and finite element calculation are conducted to its constituent components, natural frequency and vibration type figure are obtained. The basis for optimization of brake and reducing noise is provided.

Abstract: S elbow in Zhijing River is one of the key parts in the East Gas Transmission Pipeline Project. It brings a great deal of uncertainty and risk factors for pipeline pigging operations. By analysis on dynamic of pig pigging and the impact over bending, this paper established the finite element model, simulated pigging process on the condition that the operating parameters of the pipeline pigging operations were given, analyzed the relationship among pipeline pressure, foam pigging speed and pipe stress, then obtained the security of pipeline pigging operations.

Abstract: As carrying frame make by Polyphenylene Sulfide in Portable Exoskeleton to the research object, establish the 3D model of carrying frame on the basis of the configuration parameters of Human body backside, and implement the strength and stiffness analysis through the ANSYS software. The analysis is divided into three portions in accordance with working conditions, bending with no support, bending with human support and swaying with human support. Thereinto three portions have the same payload as 45kg and the same bending range attains 45 degree. Ultimately Stress value, quantity and distribution chart of the deformation have been obtained for each portion. Analysis results show that the each direction deformation Maximum and the stress Maximum of the carrying frame which bend without support present linear growth along with the increase of the bending angle in the course of the bending over. Therefore it causes the larger concentration of stress and deformation in the carrying frame and causes the additional load in the body. So the working conditions for carrying frame should be avoided which bend without support. To the rest of the two conditions, the stress and deformation of carrying frame are small enough to be meeting the use requirements.

Abstract: The diversion power system intake excavation of Jinchuan Hydropower Station forms a slope of about 160m height; its stability is one of the main geological problems of the project. By detailed site investigation, the engineering geological characteristics of intake slope (including the lithology, slope structure, the structural surface and its combinations, rock weathering and unloading, hydrology etc) is analyzed in this paper. On the basis of site slope ratio statistics, the problem of how to select a safe and economic excavation slope ratio has been studied. The finite element method and rigid limit equilibrium method were used to calculate and analyze slope stability under various working conditions. The results of analysis evaluation provide a scientific basis for the design and construction.

Abstract: Portable exoskeleton is directed at providing necessary support and help for loaded legged locomotion. The kernel of whole mechanical construction of the exoskeleton is lower extremities. The lower extremities consist of exoskeleton thigh, exoskeleton shank, hydraulic cylinder and corresponding joints. In order to find the optimal combination of design parameters of lower extremities, an improved particle swarm optimization algorithm based on simulated annealing is proposed. To improve global and local search ability of the proposed approach, the inertia weight is varied over time, and jumping probability of simulated annealing is adopted in updating the position vector of particles. Experimental results show that the improved algorithm can obtain the optimal design solutions stably and effectively with less iteration compared to the standard particle swarm optimization and simulated annealing; using ANSYS software build finite element model with the optimization result, then analyzes the strength of the model, these stress results verify the of accuracy of the improved particle swarm optimization.