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| Stress analysis and structure optimization design of annular Udiaphragm |
| DENG Hong-Ying, ZHANG Sheng-Chang, ZHENG Ying-Chen |
| (1.College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310032, China; 2.Hangzhou Hangyang Cryogenic Liquefy Equipment Co. Ltd., Hangzhou, Zhejiang 310004, China) |
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Abstract To reduce total stress level, meet the design requirement on even stress distribution and improve design efficiency of annular Udiaphragm in hydraulic diaphragm pumps, the stress and strain in Udiaphragm were analyzed and its structure was optimized by using the FEM and parameter optimization method. The stress distribution patterns, peak stress locations etc in the Udiaphragm model were summarized based on the stress distributions in the diaphragm under a series of displacement loadings calculated by conducting nonlinear analyses in FEM software Ansys. Subsequently, the structures of diaphragm end fixing clamps, moving support end and free deflection semicircle transitional segment were optimized. The parameters relating to diaphragm structure were determined by using the parameter optimization method in Ansys when the maximum stress in the diaphragm was used as a limited state variable and the total stress in elements was chosen as an objective function. The finite element analysis results indicated the maximum peak has been reduced to 0.027 MPa from 0.083 MPa in the annular Udiaphragm after the optimization, suggesting the diaphragm is going to be subject to a significantly lowered stress level. Moreover, a uniform stress distribution occurred in the inner and outer surfaces of the diaphragm, and the stress concentration effect tended to be moderate.
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Received: 05 January 2012
Published: 30 September 2012
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