文献类型：期刊文献

英文题名：Damage-driven framework for reliability assessment of steam turbine rotors operating under flexible conditions

作者：Gu, Hang-Hang[1];Wang, Run-Zi[2,3];Zhang, Kun[1];Li, Kai-Shang[1];Sun, Li[1];Zhang, Xian-Cheng[1];Tu, Shan-Tung[1]

机构：[1]East China Univ Sci & Technol, Minist Educ, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China;[2]Tohoku Univ, Adv Inst Mat Res WPI AIMR, Core Res Cluster Mat Sci CRCMS, Sendai 9808577, Japan;[3]Tohoku Univ, Grad Sch Engn, Dept Mat Proc, Sendai 9808579, Japan

年份：2025

卷号：254

外文期刊名：RELIABILITY ENGINEERING & SYSTEM SAFETY

收录：;EI(收录号：20244517319987);WOS:【SCI-EXPANDED(收录号:WOS:001350849300001)】；

基金：This work was supported financially by the National Natural Science Foundation of China (Nos. 51725503, 52005185, and 52130511) and Young Elite Scientists Sponsorship Program by CAST (YESS20200029) . Dr. Run-Zi Wang also acknowledges the support of Structure and Environmental Resistant Area in Core Research Cluster for Material Science (CRCMS) of Tohoku University.

语种：英文

外文关键词：High-temperature rotating structures; Reliability assessment; Cumulative damage; Damage threshold; Steam turbine rotor

摘要：The high-temperature rotating structures (HTRS), e.g., steam turbine rotors, often operate in extremely harsh environments with a flexible load condition during peak shaving of power system. In this work, a damage-driven framework for reliability assessment is developed in terms of the cumulative damage-damage threshold interference (CD-DT) principle, in which the cumulative damage and damage threshold are regarded as two random parameters to address uncertainties. The CD-DT principle is founded on the engineering damage theory and incorporates physics-of-failure into the probabilistic modeling of high-temperature structural reliability. Probabilistic damage analysis, correlation analysis of weak sites, system-level reliability analysis, and sensitivity analysis have been encompassed in this framework. Three numerical examples are used to verify the effectiveness and applicability of the proposed framework. Application to steam turbine rotor involving multiple weak sites with multi-damage modes illustrate the implementation procedures of the framework. Results show that the reliability-based design life of rotor decreases with the increases of start-stop frequency, the implementation of a two-shift operation would pose a threat to meeting the safety requirement of a 30-year design life. Furthermore, sensitivity analysis highlights the critical influences of initial rotor temperature and speed rising rate on rotor reliability, providing insights for operational maintenance and reliability optimization.