一种涡轮叶盘结构强度可靠性设计方法

Design method of strength reliability of turbine leaf disc structure

Abstract

本发明涉及一种涡轮叶盘结构强度可靠性设计方法,确定涡轮叶盘结构的初始方案,确定结构的几何形状,并计算重量;获取结构的确定性载荷,进行详细的三维应力/应变分析,将确定性设计准则作为优化约束条件,若不满足准则要求,则返回设计支持;分析影响涡轮叶盘结构的随机因素及其分布特征,确定易失效考核部位,计算获得考核部位的强度可靠性,结合强度概率准则,对强度可靠性分析结果进行评估,如强度可靠性结果不满足准则要求,则返回设计支持;对各考核部位最大应力的风险水平进行组合风险评估,计算涡轮叶盘结构的整体失效概率;判断是否满足各项技术指标要求,如不满足,转入设计支持,对尺寸或材料进行修改;循环执行整个过程,直至满足要求。
The invention relates to a design method of the strength reliability of a turbine leaf disc structure. The design method comprises the following steps: determining an initial scheme of the turbine leaf disc structure, determining the geometrical shape of the structure, and calculating weight; obtaining the deterministic load of the structure, carrying out detailed three-dimensional stress/ strain analysis, taking a deterministic design criterion as an optimization constraint condition, and returning to design support if the optimization constraint condition does not meet criteria requirements; analyzing random factors affect the turbine leaf disc structure, and the distribution characteristics of the random factors, determining a checking position which is liable to lose efficiency, calculating to obtain the strength reliability of the checking position, combining with a strength probability criteria to evaluate a strength reliability analysis result, and returning to the design support if the strength reliability result does not meet the criteria requirements; carrying out combined risk evaluation on the risk level of the maximum stress of each checking position, and calculating the integral efficiency losing probability of the turbine leaf disc structure; judging whether the integral efficiency losing probability of the turbine leaf disc structure meets the requirements of each technical index or not, transferring into the design support if the turbine leaf disc structure does not meet the requirements of each technical index, and revising dimensions or materials; and circularly executing the whole process until the integral efficiency losing probability of the turbine leaf disc structure meets the requirements of each technical index.

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