摘要
研究叶盘结构频率转向的曲线特征,是预测叶盘结构的失谐敏感性及振动局部化程度的重要前提。文章基于叶盘系统的集中参数模型,分析了频率转向曲线特征参数(频率曲线转向处曲率、频率曲线斜率、两频率曲线转向处最小距离)与叶盘系统结构参数(耦合刚度,轮盘质量)之间的内在联系,仿真研究了频率转向曲线特征参数随叶盘系统结构参数的变化规律。研究结果表明:频率曲线转向处曲率越大(或斜率越大),系统失谐敏感性越大;频率转向曲线间隙处附近的系统模态局部化变化剧烈,该区域模态对结构失谐非常敏感。
Analysis of the frequency veering curves is important for forecasting the sensitivity of the response of a blade to random mistuning.Based on the lumped parameter model of a bladed disk,the correlations between the properties of the tuned structure eigenfrequency curves,that is,the curvature of the eigenfrequency locus,the slope of the eigenfrequency locus and the minimum eigenfrequency separation,and the bladed disk＇s physical notions,that is,the interblade coupling and the disk quality,was studied in this paper.The law of the changing of the tuned free vibration characteristics with the bladed disk＇s structural parameters was also studied.The results show that： the larger the curvature or the slope is,the more sensitive the blades＇ response to random mistuning;there is a minimum eigenfrequency separation around which dramatic fluctuation of the mode localization degree occurs,and the blade modes are very sensitive to random mistuning.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2010年第5期764-768,共5页
Journal of Northwestern Polytechnical University
基金
国家自然科学基金(50775181)资助
关键词
叶盘结构
集中参数模型
频率转向曲线特征
失谐敏感性
bladed disk
lumped parameter model
frequency veering curve property
mistuning sensitivity
