Papers by Keyword: Structural Analysis

Abstract: In this paper, the finite element analysis for stress/deformation/modes of vibration for the centrifugal fan impeller with constant thickness backward-curved blades using CATIA software will be presented. The principal steps of the finite element analysis procedure using CATIA/Generative Structural Analysis environment will be presented: creating the 3D model; configuring the mesh; applying the restraints; applying the loads; running the numerical static analysis and the numerical frequency analysis; interpreting the results and observing the modes of vibration correlating with the impeller mode shape. This procedure will be used for 4 different centrifugal fan impellers according with the 4 blade design methods and the results will be comparatively analyzed. For each design method, two materials will be used: steel with density of 7860 kg/m³ and aluminium with density of 2710 kg/m³. Two important results have been obtained after the structural analysis: under the working conditions considered for the analysis, all 4 blade design methods leads to impellers with very good mechanical behaviour; any frequency of the main modes of vibrations for all blade design methods and for both materials is not in phase with the impeller speed, thus the possibility of resonance being eliminated.

Abstract: The currently applied structure and fatigue assessment of support structure for offshore wind energy converter was based on common design rules. The accurate evaluation for environments of sea floor as to installation of support structure, loads of generator, dynamic loads in operation, and offshore environmental loads might be an essential requirement to acquire a safety design for the substructure. This study aims at dedicating to offshore-relevant technology fields by suggesting design methods of structures and estimating their safety in relation to the structural analysis of the substructure requiring high safety to various environment conditions. Especially, with respect to 5MW Offshore Wind Power System, this study will provide information about major wind directions and duration in combination with the developing wave climate at the test field. In this study in the dynamic analysis for 5MW offshore wind power substructure which is considered to be proper in Korea, it is expected that reliability of domestic technology is confirmed with respect to its structural stability.

Abstract: Concentrated solar thermal (CST) power has been used for years to help supply power to certain energy markets and has proven to be fairly successful. Unfortunately the high prices of these solar technologies have prohibited them from really making a large impact on the world's energy scene. This study analyses the structural, thermal, and CFD performance of a parabolic dish concept which could be the basis for large scale commercial concentrated solar thermal electricity. Simulation of the structural, thermal and CFDanalysis of the dish with varying metallic properties (Aluminium, Copper and StainlessSteel) under different windconditionswas compared. Computational Fluid Dynamics (CFD) was done to simulate the thermal performance of the dish at two different wind velocities.

Abstract: MSC.Nastran is the popular large finite element structural analysis software. In order to combine the advantages of MSC.Nastran software and high-performance computers, the second development of the finite element software MSC.Nastran based on parallel computers is researched in this paper. This can improve MSC.Nastran application and calculating efficiency, finally a practical example is given to verify its correctness and efficiency.

Abstract: In this article, according to the reliability appraisal of the structure of a heavy industrial plant which is near service limit years, we found several major safety hazard issues and proposed corrective measures to reinforce. On the basis of structural calculation and analysis, we could determine whether to upgrade the crane and propose the corresponding feasibility upgrade project, which can provide the basis for other similar identification.

Abstract: Porous materials, such as filters made of sintered metals, lagging materials, and fireproof materials, are utilized in various fields. The porosity changes the characteristics of the materials. For example, with heat-insulating foam, the higher the porosity, the greater is the insulation factor. However, increased porosity leads to a decline in mechanical properties. Thus, when using porous materials, analyzing the mechanical strength is necessary. We modeled a porous structure of sintered metal sample and estimated the Young's modulus using the numerical analysis software “ADVENTURE” and compared the estimated value with the experimental value. Also, we modeled the effect of porosity and pore diameter on the mechanical property of the material. From the results, the Young's modulus decreases with increases in porosity and pore diameter, as expected.

Abstract: In this study, the influence of workrest positions on the deflection of a crankshaft is investigated, in order to enhance the machining precision in orbital grinding. Crankshafts of 3m, 5m and 8m are selected, and three types of states (no machining, journal machining and pin machining) are studied. The model is simplified with stiffnesses applied to the stock instead of real contact between workrest and stock. As the workrests are positioned to the machining region, the deflection of the machined stock is reduced. Pin machining shows more stable result than journal machining.

Abstract: There has been a recent increase in emphasis on small satellite because of their low cost, short development time’s relative simplicity, and cost efficiency. However, these satellites do have drawback. Their small size results in small surface areas which often translate into thermal and power constraint. A satellite basically any object that revolves around a planet in a circular or elliptical orbit path. nanosatellites are satellites that weigh less than 10Kg. These types of satellites are designed and developed to carry payloads that are much smaller and has a life span not more than 1 year generally. The below analysis is done on a Low Earth Orbiting Satellite.

Abstract: High temperature Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_δ of low density has been synthesized via co-precipitation method and its electrical and structural properties have been studied. The optimum porosity of the samples was obtained using variety amount of sucrose C₁₂H₂₂O₁₁ which is used as supplementary filler. The electrical properties of superconductor such as critical temperature, T_c and critical current density, J_c were determined using the four-probe method. X-ray diffraction (XRD) was used to analyze the structural properties of the samples. The density of samples was measured using densitometer. The obtained results have revealed a significant influence of the pore presence in superconducting samples on the electrical properties. The T_c for low density Bi-2223 with 0.1g sugar sucrose is much higher compared to 0.05g, 0.15g and standard sample which is T_{c zero} is 98 K. The J_c for low density Bi-2223 with 0.1g sugar sucrose is 6 A/cm² at 60 K which is higher than high density samples. The crystallographic structure remains in the tetragonal form where a=b≠c for all samples.

Abstract: The automotive development process is advancing through the utilization of CAD/CAM/CAE. This advancement is being enhanced by proper utilization of CAD/CAM integration, Digital prototyping and Digital mock-up. Until recently, CAD has played the leading role for the digitalization of automotive development. However, recent trend shows that, the leading role is shifted from CAD to analysis simulation. Three-dimensional design, which utilizes digital mock-up, is becoming the main tool for product design. Here, the functional capability and predictive assessment by CAE is the core technology. In addition, this supporting role is helping to realize the concurrent engineering in production engineering field.