随机裂纹叶片抗共振可靠度及概率敏感性分析.pdfVIP

第30 卷 第32 期 中 国 电 机 工 程 学 报 Vol.30 No.32 Nov.15, 2010 2010 年11 月15 日 Proceedings of the CSEE ©2010 Chin.Soc.for Elec.Eng. 71 0258-8013 (2010) 32-0071-06 TK 262 A 470 30 文章编号： 中图分类号： 文献标志码： 学科分类号： ⋅ 随机裂纹叶片抗共振可靠度及概率敏感性分析 安利强，赵怀璧，王璋奇 (华北电力大学能源与动力工程学院，河北省 保定市 071003) Antiresonance Reliability and Probabilistic Sensitivity Analysis for Random Cracked Blade AN Liqiang, ZHAO Huaibi, WANG Zhangqi (School of Energy and Power Engineering, North China Electric Power University, Baoding 071003, Hebei Province, China) ABSTRACT: The antiresonance reliability and probabilistic 0 引言 sensitivity of cracked blade with random parameters of crack 叶片是汽轮机、风力机等动力机械的重要部 were studied. The parametric finite element model of the 件，叶片通常在交变的载荷下工作，容易出现疲劳 cracked blade with random location, depth of crack and 裂纹，裂纹对叶片有极大的危害。叶片是否出现裂 rotating speed was built. The sample points were obtained 纹、裂纹的位置和大小以及出现裂纹后的安全评估 based on central composite design. A quadratic polynomial linear regressive model was chosen as metamodel to establish 问题是重要问题。通过叶片振动特性的改变来监测 the surrogate of the finite element model, and the accuracy of 和诊断裂纹是一个重要的途径。 the surrogate model was evaluated through three performance 文献[1]研究了裂纹位置和深度对频率和叶尖 metrics. The finite element model replaced by the approximate 变形的影响，研究表明可以通过固有频率和叶尖变 model and the Monte Carlo simulation (MCS) was used to 形的变化在线监测裂纹。文献[2]通过叶片振动频率 study the probabilistic sensitivity and reliability of the crack