结构振动阻尼测试的衰减法研究

尹帮辉 王敏庆 吴晓东

振动与冲击 ›› 2014, Vol. 33 ›› Issue (4) : 100-106.

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PDF(1307 KB)
振动与冲击 ›› 2014, Vol. 33 ›› Issue (4) : 100-106.
论文

结构振动阻尼测试的衰减法研究

  • 尹帮辉 王敏庆 吴晓东
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Study on decay method for structure vibration damping test

  • Yin Bang-hui, Wang Min-qing,Wu Xiao-dong
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文章历史 +

摘要

使用反向滤波、反向积分、能级平均等技术构建了衰减法阻尼测试的数据处理系统,研究了衰减法阻尼测试结果与统计能量分析意义下的频段阻尼之间的关系,探讨了频段外模态的阻尼对频段阻尼测试结果的影响,最后使用平板的瞬态冲击有限元仿真数据对相关结论进行了验证。研究表明:在所研究的频段内,当各模态的阻尼相差不大时,衰减法测试结果同统计能量分析意义下的频段阻尼一致,反之衰减法测试结果小于统计能量分析意义下的频段阻尼;当频段外含有阻尼较小的模态时,该模态对该频段的频段阻尼测试结果将产生较大的影响;如果各模态的模态阻尼随频率变化平缓,则各频段的频段阻尼测试结果较为准确,反之相关频段的频段阻尼测试结果误差较大。

Abstract

The technologies of reverse filtering, backward integral and energy level average are used to build the damping test data processing system for decay method; the relationship between the decay method test results and frequency-band damping in the sense of statistical energy analysis and the effect of modes outside the frequency band on damping test results are studied; in the end of this paper, a plate’s transient impact response data from finite element simulation are used to verify the relevant conclusions. The main conclusions include: if the difference of the modal damping of the modes in the frequency-band is small, the decay method results are close to frequency-band damping in the sense of statistical energy analysis while on the contrary the decay method results are less than frequency-band damping in the sense of statistical energy analysis; if there are modes with small damping outside the considered frequency-band, the damping test results will be strongly influenced by the mode; if the damping of each mode gently changes with frequency, the decay method test results are accurate, while on the contrary a large error will be caused.



关键词

衰减法 / 阻尼测试 / 频段平均阻尼 / 统计能量分析

Key words

Decay method / damping test / frequency-band averaged damping loss factor / statistical energy analysis

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导出引用
尹帮辉 王敏庆 吴晓东. 结构振动阻尼测试的衰减法研究[J]. 振动与冲击, 2014, 33(4): 100-106
Yin Bang-hui;Wang Min-qing;Wu Xiao-dong. Study on decay method for structure vibration damping test[J]. Journal of Vibration and Shock, 2014, 33(4): 100-106

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