Comparison of the Time Domain Windows Specified in the ISO 18431 Standards Used to Estimate Modal Parameters in Steel Plates

Q2 Physics and Astronomy Advances in Acoustics and Vibration Pub Date : 2016-08-29 DOI:10.1155/2016/3837971

Jhonatan Camacho-Navarro, R. Guzmán-López, S. Gómez, Marco Fidel Flórez

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Abstract

The procedures used to estimate structural modal parameters as natural frequency, damping ratios, and mode shapes are generally based on frequency methods. However, methods of time-frequency analysis are highly sensible to the parameters used to calculate the discrete Fourier transform: windowing, resolution, and preprocessing. Thus, the uncertainty of the modal parameters is increased if a proper parameter selection is not considered. In this work, the influence of three different time domain windows functions (Hanning, flat-top, and rectangular) used to estimate modal parameters are discussed in the framework of ISO 18431 standard. Experimental results are conducted over an AISI 1020 steel plate, which is excited by means of a hammer element. Vibration response is acquired by using acceleration records according to the ISO 7626-5 reference guides. The results are compared with a theoretical method and it is obtained that the flat-top window is the best function for experimental modal analysis.

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用于估计钢板模态参数的ISO 18431标准中指定的时域窗口的比较

用于估计结构固有频率、阻尼比和模态振型等模态参数的程序通常基于频率方法。然而，时频分析方法对用于计算离散傅里叶变换的参数非常敏感:窗口，分辨率和预处理。因此，如果不考虑适当的参数选择，则会增加模态参数的不确定性。本文在ISO 18431标准的框架下，讨论了用于估计模态参数的三种不同时域窗函数(汉宁窗函数、平顶窗函数和矩形窗函数)的影响。在aisi1020钢板上进行了锤击元件激励试验。根据ISO 7626-5参考指南，通过使用加速度记录获得振动响应。结果与理论方法进行了比较，得出平顶窗是试验模态分析的最佳函数。

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Advances in Acoustics and Vibration ACOUSTICS-

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期刊介绍： The aim of Advances in Acoustics and Vibration is to act as a platform for dissemination of innovative and original research and development work in the area of acoustics and vibration. The target audience of the journal comprises both researchers and practitioners. Articles with innovative works of theoretical and/or experimental nature with research and/or application focus can be considered for publication in the journal. Articles submitted for publication in Advances in Acoustics and Vibration must neither have been published previously nor be under consideration elsewhere. Subject areas include (but are not limited to): Active, semi-active, passive and combined active-passive noise and vibration control Acoustic signal processing Aero-acoustics and aviation noise Architectural acoustics Audio acoustics, mechanisms of human hearing, musical acoustics Community and environmental acoustics and vibration Computational acoustics, numerical techniques Condition monitoring, health diagnostics, vibration testing, non-destructive testing Human response to sound and vibration, Occupational noise exposure and control Industrial, machinery, transportation noise and vibration Low, mid, and high frequency noise and vibration Materials for noise and vibration control Measurement and actuation techniques, sensors, actuators Modal analysis, statistical energy analysis, wavelet analysis, inverse methods Non-linear acoustics and vibration Sound and vibration sources, source localisation, sound propagation Underwater and ship acoustics Vibro-acoustics and shock.