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首页> 外文OA文献 >Non-contact experimental assessment of apparent dynamic stiffness of constrained-layer damping sandwich plates in a broad frequency range using a Nd:YAG pump laser and a laser Doppler vibrometer
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Non-contact experimental assessment of apparent dynamic stiffness of constrained-layer damping sandwich plates in a broad frequency range using a Nd:YAG pump laser and a laser Doppler vibrometer

机译：使用Nd：YAG泵浦激光器和激光多普勒振动计在宽频率范围内进行非接触实验评估约束层阻尼夹心板的表观动态刚度

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This paper concerns the assessment of the dynamic stiffness of plates using non-contact excitation and non-contact measurements.In particular, a constrained-layer damping sandwich plate is considered, of which the apparent dynamic stiffness as function of frequency is determined.The experimental results compare very well with an analytical model that computes the frequency dependent apparent bending stiffness of the constrained-layer damping sandwich plate.A Nd:YAG laser is used for excitation of the plate and a laser Doppler vibrometer is used to measure its dynamic response along a line on the plate, thus reducing the measurement effort.Using advanced data acquisition and data processing techniques, a signal-to-noise ratio of up to 100 dB was obtained, yielding estimates of the flexural wavenumber and dynamic stiffness of the plate up to a frequency of 50 kHz.It is shown that the Prony method and the wavenumber fit method yield a much improved wavenumber resolution as compared to the spatial Fourier transform method. An additional advantage of the wavenumber fit approach is that it allows the accuracy of the fit to be determined. The accuracy was estimated at 1 rad/m (best relative wavenumber resolution 2 perthousand).
机译：本文涉及通过非接触激励和非接触测量来评估板的动态刚度，特别是考虑了约束层阻尼夹心板，并确定了视在动态刚度与频率的函数关系。结果与分析模型的计算结果非常吻合，该分析模型计算了与频率相关的约束层阻尼夹心板的表观弯曲刚度.Nd：YAG激光器用于激励该板，激光多普勒振动计用于测量其沿轴向的动态响应使用先进的数据采集和数据处理技术，可获得高达100 dB的信噪比，从而估算出板的挠曲波数和动态刚度，直至频率为50 kHz的结果表明Prony方法和波数拟合方法与空间傅立叶变换方法。波数拟合方法的另一个优点是，它可以确定拟合的准确性。估计精度为1 rad / m（最佳相对波数分辨率为2千）。

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