振动、测试与诊断2024，Vol.44Issue(2) ：298-304.DOI:10.16450/j.cnki.issn.1004-6801.2024.02.014

透平叶片全域动应变-叶尖振动映射方法研究

Study on Global Dynamic Strain Tip Vibration Mapping Method of Turbine Blade

王治良 王维民 张扬 张旭龙 李天晴
振动、测试与诊断2024，Vol.44Issue(2) ：298-304.DOI:10.16450/j.cnki.issn.1004-6801.2024.02.014
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透平叶片全域动应变-叶尖振动映射方法研究

Study on Global Dynamic Strain Tip Vibration Mapping Method of Turbine Blade

王治良 1王维民 2张扬 1张旭龙 1李天晴1
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作者信息

  • 1. 北京化工大学高端机械装备健康监控与自愈化北京市重点实验室 北京,100029
  • 2. 北京化工大学高端机械装备健康监控与自愈化北京市重点实验室 北京,100029;压缩机技术国家重点实验室 北京,100029
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摘要

针对高速旋转叶片振动导致的叶片裂纹甚至断裂而影响设备运行安全的问题,研究了叶片全域动应变与叶尖振动幅值的映射关系,提出一种透平叶片弯曲及扭转共振下叶片动应变非接触式测试方法,可实现基于叶尖振动幅值的叶片动应变反演,为叶片疲劳寿命预测奠定基础.首先,以某透平叶片为对象,对叶片进行模态分析获取全域应变和幅值比,进行叶尖振动测量点的优化;其次,运用振动台对叶片进行振动激励试验,获得叶片1阶、2阶共振下模态频率和应变-位移响应比,并对有限元分析模型进行修正.研究结果表明,所提出的叶片动应变测试应变-位移相对误差小于10%,频率误差小于1%,证明了叶片动应变测试方法的有效性.

Abstract

The blade crack and even fracture caused by high-speed rotating blade vibration seriously affect the equipment operation safety.The research on blade vibration characteristics,especially fatigue life,is of great significance.In this paper,the mapping relationship between blade global dynamic strain and blade tip vibration amplitude is studied,and a non-contact measurement method of blade dynamic strain under turbine blade bend-ing and torsional resonance is proposed.Based on this method,the inversion of blade dynamic strain based on blade tip vibration amplitude can be realized,which lays a foundation for blade fatigue life prediction.Taking a turbine blade as the object,the modal analysis of the blade is carried out to obtain the global strain and amplitude ratio.The blade tip vibration measurement points are optimized.The vibration excitation test of the blade is car-ried out by using the shaking table to obtain the modal frequency and strain displacement response ratio under the first and second-order resonance of the blade.The results show that the relative error of strain displacement is less than 10%and the frequency error is less than 1%.The effectiveness of the blade dynamic strain test method is proved by small error results.It has certain guiding significance for blade parameter monitoring and model optimization.

关键词

动应变/叶片振动/模态分析/高频振动/应变-位移响应

Key words

dynamic strain/blade vibration/modal analysis/high frequency vibration/strain displacement re-sponse

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基金项目

国家重点研发计划(2020YFB2010803)

国家自然科学基金(51775030)

国家自然科学基金(91860126)

出版年

2024
振动、测试与诊断
南京航空航天大学 全国高校机械工程测试技术研究会

振动、测试与诊断

CSTPCD北大核心
影响因子：0.784
ISSN：1004-6801
参考文献量13
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