| Turbine-Generator machine set is the crucial equipment of waterpower. Bulb Tubular Turbine-Generator is the eximious type that develops the hydraulic resources of low headwater. With the high development of the national economy of our country,the development of the hydraulic resources of low headwater has been taken into account. It is benefit to improve the level of designing this type and production efficiency if the thought of Finite Elements Method and Optimization Design combined with engineering analysis software is applied into development and design of Bulb Tubular Turbine-Generator.In this paper, tubular-shaped foundation, one of the key parts of Bulb Tubular Turbine-Generator, is analyzed with Finite Elements Method and the Theory of Optimized Analysis combined with Pro/E and ANSYS, mainly static strength analysis and optimized design analysis.Firstly, according to the actual structure of tubular-shaped foundation, three dimensions substance geometry model is built with Pro/E, and the relative small structures are neglected to predigest the model. According to the request of Finite Element Analysis, I modified the model of tubular-shaped foundation, and neglect the holes on flanges. Then the solid geometry model is inputed into ANSYS to do the pre-treatment of FEA. The model is disassembled by ten-noded tetrahedron elements.Secondly, static strength of tubular-shaped foundation is analyzed and calculated with ANSYS to gain the stress distribution and deformed state of tubular-shaped foundation. Analysis result shows: The stress of the passing- men hole near the both end of tubular-shaped foundation is greater; by contrast with material submitted stress limit, strength reserve of tubular-shaped foundation is still very greater. In a word, tubular-shaped foundation meets the requirement under various static loads.Finally, the result of stress distribution and deformed state of tubular-shaped foundation shows: The maximal stress value in original design is much less than the breaking point of material. So it is necessary to optimize the structure of the tubular-shaped foundation. The model of optimized analysis is founded with parameter. Then the model is optimized analysis after the establishment of design variable, state variable and design object. The result of optimized analysis shows: The stress and strain of tubular-shaped foundation distributed more reasonably. The material is sufficiently used, the weight effectively lightened. So the cost of product is reduced.The research for tubular-shaped foundation has lard certain foundation for analysis with FEM and optimization design of overall machinery and others parts and calculation of vibration responds. The research played the guiding significance role in applying ANSYS into other parts of waterpower equipment. |
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