中国机械工程 ›› 2013, Vol. 24 ›› Issue (1): 73-77.

• 机械基础工程 • 上一篇    下一篇

叶盘结构频率转向特征及失谐敏感性实验研究

赵志彬;贺尔铭;王红建;陈熠   

  1. 西北工业大学,西安,710072
  • 出版日期:2013-01-10 发布日期:2013-01-23
  • 基金资助:
    国家自然科学基金资助项目(50775181);西北工业大学基础研究基金资助项目(JC20110237) 
    National Natural Science Foundation of China(No. 50775181)

Experimental Investigation on Frequency Veering and Mistuning Sensitivity of Bladed Disks

Zhao Zhibin;He Erming;Wang Hongjian;Chen Yi   

  1. Northwestern Polytechnical University, Xi'an, 710072
  • Online:2013-01-10 Published:2013-01-23
  • Supported by:
     
    National Natural Science Foundation of China(No. 50775181)

摘要:

搭建了用于失谐叶盘结构固有特性及失谐敏感性研究的实验平台,对谐调叶盘结构的频率转向现象进行了实验研究,验证了以往理论分析和有限元仿真中发现的频率转向特征和模态振型转换现象;通过在叶尖粘贴不同的质量块,模拟了三种典型的叶片失谐形式,实验研究了失谐叶盘结构的模态局部化问题;针对同一叶片失谐形式下不同的模态密度区域,实验研究了模态密度对失谐敏感性的影响规律。实验结果与有限元实验仿真结果吻合较好。

关键词: 叶盘结构, 频率转向, 模态局部化, 模态密度, 失谐敏感性

Abstract:

Experimental setups were built for investigation of vibration of tuned and mistuning bladed disks herein. A stationary, nominally periodic, 12-bladed disk with simplified geometry was manufactured. The frequency veering in natural frequency curves vurse nodal diameter figure was captured from the experimental results of the tuned bladed disk and the mode shape exchange related to the frequency veering was observed. By adding small blocks with different weights to the blade tips,three typical mistuned bladed disk were simulated in the experiment,and the mode localization was verified in all of the three blade mistuned speciments. The relationship between modal density and mistuning sensitivity of bladed disk was studied. The experimental results indicate that the localization of the mode shapes is most acute in frequency regions of high modal density. All the experimental results are very good agreement with those of the finite element analysis.

Key words: bladed disk, frequency veering, mode localization, modal density, mistuning sensitivity

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