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以某型航空涡轴发动机涡轮叶片叶冠为研究对象进行结构优化设计。根据叶冠的特点建立了叶冠优化设计的数学模型,确定了叶冠的设计变量、目标函数和约束函数,建立了叶冠的优化设计流程,研究以叶冠工作面上应力最小和叶冠重量最轻为目标函数;以预扭角、工作面偏转角等叶冠的结构尺寸为设计变量;以结构、强度和振动要求为约束条件。运用可视化编程(VC)、UG/OPEN API函数和APDL语言将建立的参数化模型与有限元结构强度分析进行集成,并利用多学科优化软件i SIGHT完成对带锯齿冠叶片的结构优化,得到了的优化设计结果。经过优化后的锯齿冠叶片的应力分布与优化前相比更加合理,叶冠的重量相比优化前降低了0.982%,锯齿冠工作面上的应力降低了22.83%。
The structural optimization design of the turbine blade vane of a certain type of aviation turboshaft engine is taken as the research object. According to the characteristics of the leaf crown, a mathematical model of the optimal design of the leaf crown was established, and the design variables, the objective function and the constraint function of the leaf crown were determined. The optimal design procedure of the leaf crown was established. And the lightest weight is the objective function. The structure dimensions of the blade crown, such as the pre-torsion angle and the working face deflection angle, are taken as the design variables. The structural, strength and vibration requirements are the constraints. The parametric model established by Visual Programming (VC), UG / OPEN API function and APDL language are integrated with the finite element structural strength analysis. Structural optimization of serrated canopy blades is accomplished with i SIGHT, a multidisciplinary optimization software. Optimization design results. The optimized stress distribution of sawtooth crown blades is more reasonable than that before optimization. The weight of blade tip is reduced by 0.982% compared with that before optimization, and the stress on saw tooth crown working face is reduced by 22.83%.