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基于涡轮盘结构的低循环疲劳设计流程,将概率设计理念融入设计过程中,提出了涡轮盘低循环疲劳的概率设计流程。首先进行涡轮盘结构的优化分析,其中以确定性设计准则作为约束条件;以优化结构方案为基础,考虑参数的随机性,对涡轮盘低循环疲劳进行可靠性分析;以低循环疲劳寿命的可靠度为概率设计准则,对涡轮盘进行反复的设计和计算验证,通过修改结构尺寸完成涡轮盘低循环疲劳的概率设计。同时,根据灵敏度分析结果,讨论了设计变量的分散性对涡轮盘寿命的影响,为进一步提高结构的可靠性提供了新的研究思路。结果表明,按照概率设计观点确定的涡轮盘结构兼顾性能和可靠性,在满足可靠度的前提下降低涡轮盘的重量。同时该概率设计流程简单方便,易于工程的推广应用。
Based on the low cycle fatigue design flow of turbine disk structure, the concept of probability design is integrated into the design process, and the probability design flow of low cycle fatigue of turbine disk is proposed. First of all, the optimal analysis of the turbine disk structure is carried out, of which the deterministic design criterion is used as the constraint condition. Based on the optimized structure scheme, considering the randomness of the parameters, the reliability analysis of the low cycle fatigue of the turbine disk is carried out. Degrees of probability design criteria, the turbine disk repeated design and calculation verification, by modifying the structure size of the turbine disk to achieve low-cycle fatigue probability design. At the same time, according to the results of sensitivity analysis, the influence of design variables dispersion on turbine disk life is discussed, which provides a new research idea for further improving the reliability of the structure. The results show that the turbine disc structure, which is determined from the viewpoint of probability design, has both performance and reliability, and reduces the weight of the turbine disc under the premise of meeting the reliability requirements. At the same time the probability of design process is simple and convenient, easy to promote the application of the project.