发电机复合材料护环的强度刚度分析和铺层设计
STIFFNESS AND STRENGTH ANALYSIS AND PLY DESIGN OF COMPOSITE RETAINING RINGS FOR LARG GENERATORS
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摘要: 本文考虑了横向剪切变形的影响,采用“退化”的三维等参单元,建立承受非均匀表面力、离心体积力和热应力联合作用的一般层合各向异性壳的有限元公式和程序,并用它对25MW发电机玻璃纲护环进行刚度、强度分析。提出铺层缠绕的优化设计方案。Abstract: The choice of materials used in making retaining rings for generator plays very important role in studying large central power statior. generators.The unility of advanced composites which have a high stiffnes-to-weight ratio, high strength-to-weight can offer significant advantages to electrical industry.The composite retaining ring is a laminated shell of uniform-thickness orthotropic layers.The forces acting upon the ring are the centrifugal f once (ω=3000 rpm),thermal stresses due to the difference of the temperature between the inner and outer surfaces of the ring and the unsymmetrical pressures of the coils exerted on the inner surface.In this paper a generalized laminated shell finite element formula including transverse shear strains is presented and a tomputer programme is written for this problem.
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