| 基于振型节径谱的失谐叶盘结构动态特性评价 |
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| 引用本文： | 姚建尧,王建军,李其汉. 基于振型节径谱的失谐叶盘结构动态特性评价[J]. 推进技术, 2011, 32(5) |
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| 作者姓名： | 姚建尧 王建军 李其汉 |
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| 作者单位： | 北京航空航天大学能源与动力工程学院,北京,100191 |
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| 基金项目： | 国家“八六三”项目(2008AA04Z403) |
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| 摘 要： | 基于叶盘结构振型的离散傅里叶变换,给出振型节径谱的定义。对于一个简化的叶盘结构,利用节径谱的概念对失谐叶盘的动态特性进行了评价和分析。在固有特性方面,基于节径谱改进了模态局部化因子的定义,得到了随机失谐叶盘的模态特性的统计特征;在响应特性方面,基于振型和激励节径谱的相似程度定义了模态激励因子,很好地解释了随机失谐程度的＂阈值＂效应和最优人为失谐的存在性。算例表明,节径谱是衡量的振型空间分布的重要指标,在失谐叶盘结构动态特性分析和评价中有着重要的应用。
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| 关 键 词： | 失谐叶盘 节径谱 模态局部化因子 模态激励因子 幅值放大比 |
Dynamic characteristics assessment of mistuned bladed disk using nodal diameter spectrum of mode shapes |
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| YAO Jian-yao,WANG Jian-jun,LI Qi-han. Dynamic characteristics assessment of mistuned bladed disk using nodal diameter spectrum of mode shapes[J]. Journal of Propulsion Technology, 2011, 32(5) |
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| Authors: | YAO Jian-yao WANG Jian-jun LI Qi-han |
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| Affiliation: | YAO Jian-yao,WANG Jian-jun,LI Qi-han(Coll. of Energy and Power Engineering,Beijing Univ. of Aeronautics and Astronautics,Beijing 100191,China) |
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| Abstract: | The nodal diameter spectrum is defined based on the discrete Fourier transform of mode shapes.The dynamic characteristics assessment and analysis for a simplified bladed disk is performed using the concept of nodal diameter spectrum(NDS).For the free vibration,the definition of mode localization factor is improved based on the NDS,and the probability statistics of modal properties are obtained for the random mistuned bladed disk.For the forced vibration,the modal excitation factor(MEF) is defined based on s... |
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| Keywords: | Mistuned bladed disk Nodal diameter spectrum Mode localization factor Modal excitation factor Amplitude magnification |
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