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为保证双辐板涡轮盘/榫结构疲劳寿命及可靠性,提出基于静强和寿命可靠性的涡轮盘/榫结构优化设计方法.采用盘身轴对称模型和涡轮盘/榫三维模型交替优化策略,进行轮盘静强结构优化.结合材料应力-寿命数据,对满足静强准则的涡轮盘/榫结构进行考虑尺寸效应的寿命可靠性分析,并建立各危险区域给定可靠度的峰值应力-寿命曲线.基于涡轮盘/榫静强优化设计平台,利用给定可靠度的应力-寿命曲线数据修改结构优化单点应力标准.在保证不出现轮盘破裂的前提下,将轮盘寿命可靠性优化的复杂过程简化为基于应力标准的寻优过程.典型例优化结果表明:静强优化后涡轮盘/榫的寿命不能满足设计要求;经寿命可靠性优化后,轮盘疲劳寿命较优化前增加了47.28%,满足寿命可靠性设计要求;且在轮盘静强优化质量减轻16.66%的基础上,再减轻3.43%;该方法在保证优化精度的条件下,可大幅提高优化效率,且易于工程设计中应用.
In order to ensure the fatigue life and reliability of double disc plate turbine disc / tenon structure, an optimal design method of turbine disc / tenon structure based on the static strength and life reliability is proposed.The axial symmetry model and turbine disc / tenon three-dimensional model alternating optimization strategy , To optimize the static structure of the roulette wheel.According to the material stress-life data, the reliability analysis of the life span of the turbine disk / mortise structure considering the static strength criterion considering the size effect is carried out, and the peak stress- Life curve.On the basis of the optimized design platform of turbine disk / tenon static strength, the stress-life curve data of given reliability is used to modify the single-point stress standard of structure optimization.Under the premise of avoiding the disk rupture, The optimization of complex process is simplified to the optimization process based on the stress criterion.Experimental results show that the life of the turbine disk / tenon can not meet the design requirements after optimization of the static strength and the fatigue life of the disk increases after optimization of the life reliability, Up to 47.28%, which meets the design requirements of life reliability. And on the basis of a 16.66% reduction of the static strength of the roulette wheel, it further reduces 3.43% Under parts, optimization can significantly improve efficiency and ease of application engineering design.