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Under the action of internal waves portfolio performance analysis of shell structure

Author: CuiYiQiong
Tutor: CaiZeWei；XuYongChun
School: Ningbo University
Course: Structural Engineering
Keywords: Internal waves Combination shell Edge stress ANSYS
CLC: TV139.2
Type: Master's thesis
Year: 2009
Downloads: 33
Quote: 0
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Abstract


Ocean waves are made up of water bodies within the hierarchical structure (such as density stable stratification) was induced by a gravitational wave, the maximum amplitude in the ocean interior, and with the same wave mechanics plays an important role. Others have already established under the internal wave mathematical model to the theoretical basis of the boundary element method, has been submerged body in a layered model by the sea force. Based on the analysis of this conclusion, the actual Neibo He contained in the surface potential distribution is uneven, and its size will be submerged body with the distance from the density of the thermocline and change. In this paper, the internal wave frequency ω = 0.08s? 1, pycnocline located at a distance of 50 meters from the sea within the wave model. Then the surface of the latent structure is divided into 480 areas, the simplified analysis of just one-eighth of a submerged body, which acts on the area in 60 different pressure values, which for the subsequent finite element analysis of actual available internal wave structure under stress data. Respectively, after 20 meters from the thermocline at 40 meters Neibo He set out for analysis and processing. On this basis, this paper combined torque theory shell structure (ball tube shell composite structure) under pressure in a uniform external stress is analyzed theoretically. Ball cylindrical shell composite structure body having a representative as a latent structure will change in an angle with the center shell and affect the stress at the connecting edge. This semi-circular respectively spherical center point of 90 ° ~ 50 ° from six kinds of selected calculation model was found starting from the shell by the result of the calculation result of the calculation cylindrical shell departure basically. Taking into account the model at the edges of the connection process and the actual remaining in idealized difference, so the theoretical formula based on the first correction to obtain a semi-empirical semi-theoretical formula. Then using the finite element analysis software ANSYS model of the six kinds of numerical simulation. The results obtained with the semi-empirical comparative analysis of semi-analytical solution, we found that the two basically. Proven, the formula for the ball under uniform load combination cylinder shell structure (semi-central angle 90 ° ~ 50 °) of the edge of the stress calculation. Finally calculated using ANSYS software to simulate actual Neibo He set out under the edge of the structure stress, and with an average load of the internal waves into semi-theoretical semi-empirical formula obtained results were analyzed to get a fix on the angle and depth of the relationship, the formula the second amendment. Computational analysis found that the combination of internal waves under the influence of the shell structure edge stresses three factors: first, the Neibo He set itself is uneven, ie combinations of submerged body shell on each area after dividing the pressure range; Second, the structure of the surface With the potential depth Neibo He set and change; Third, the combination with the center point of the housing edge stress is changed. This paper attempts amended twice, to get an empirical formula, and hoped that the formula can facilitate the engineering and technical personnel in practical applications.

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CLC: > Industrial Technology > Hydraulic Engineering > The basic science of water resources project > Hydraulics > Wave hydraulics
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