斗轮机金属结构疲劳寿命预测与检验标准研究

Research on fatigue life prediction and inspection standard of bucket metal structure

摘要

斗轮机结构服役工况复杂，易发生疲劳累积与隐性损伤。本文构建应力谱驱动的疲劳寿命预测方法，集成有限元建模、热点识别与应变寿命参数，实现局部寿命估算与疲劳分区划分。提出寿命系数设定与疲劳极限控制逻辑，建立分级检验流程与预警机制。结合华电电力科学研究院斗轮机现场数据开展验证，预测模型误差控制在8%以内，检验标准可动态适配退化趋势，验证方法实用性强，具备工程推广价值。

Abstract

The service conditions of bucket wheel excavators are complex, making them prone to fatigue accumulation and hidden damage. This paper develops a fatigue life prediction method driven by stress spectra, integrating finite element modeling, hot spot identification, and strain life parameters to achieve local life estimation and fatigue zone division. It proposes a logic for setting life coefficients and controlling fatigue limits, establishing a hierarchical inspection process and early warning mechanism. Combining on-site data from the Huadian Electric Power Research Institute, the prediction model error is controlled within 8%, and the inspection standards can dynamically adapt to degradation trends. The verification method is highly practical and has engineering application value.

关键词

疲劳寿命预测 / 斗轮机结构 / 应力谱建模 / 检验标准 / 工程验证

Key words

fatigue life prediction / bucket crane structure / stress spectrum modeling / inspection standard / engineering verification

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