| Bolted joints are generally used for aero-engine casing connections. With the development of the aero-engine, high temperature, high pressure, high rotational speed and high thrust-weight ratio are required strictly. According to the current aero-engine design standards,the design of casing with bolted connection is based on traditional experimental equations.This design method has not achieved an optimal object for properties and functions of casing structure, and faces a greater room for improve. In this paper, study on optimal design methods of casing with bolted connections was accomplished by selecting reasonable installation edge parameters such as size, specification and bolt number, considering stiffness,strength, sealing features and quality comprehensively. The work in this paper has an important meaning.In the process of the engine design, the analysis of structural stability, stiffness and strength are usually considered, but the characteristic of seal is ignored. First of all, a typical bolt joint model is established according to finite element method. Then the height and thickness of the bolted joint, casing thickness and bolt number were analyzed, and the general rules of the stiffness, strength, seal characteristics about the structure were obtained. Secondly,the compressor casing of an aero-engine was designed using structure stiffness, strength and seal as optimization target respectively, and then.the optimal parameters verified by finite method were obtained. Thirdly, the bolted joint structure was optimized using the response surface method. Finally, several different target optimization results were compared and analyzed. It is shown that the results by the synthesize target optimization is better than the results by signal target optimization. And the structure stiffness, strength and sealing characteristics could be improved. This paper provides some useful references for the multi-objective optimization design of the bolt joint. |
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