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Multichannel Real-Time Electronics Platform for the Estimation of the Error in Impact Localization with Different Piezoelectric Sensor Densities

机译:多通道实时电子平台,用于估计不同压电传感器密度的冲击定位误差

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摘要

The work presents a structural health monitoring (SHM) electronic system with real-time acquisition and processing for the determination of impact location in laminate. The novelty of this work is the quantitative evaluation of impact location errors using the Lamb wave guided mode S0, captured and processed in real-time by up to eight piezoelectric sensors. The differential time of arrival is used to minimize an error function for the position estimation. The impact energy is correlated to the amplitudes of the antisymmetric (A0) mode and the electronic design is described to avoid saturation for signal acquisition. The same electronic system is designed to acquire symmetric (S0) low level signals by adequate gain, bandwidth, and signal-to-noise ratio. Such signals propagate into a 1.4 mm thick aluminum laminate at the group velocity of 5150 m/s with frequency components above 270 kHz, and can be discriminated from the A0 mode to calculate accurately the differential arrival time. The results show that the localization error stabilizes at a value comparable with the wavelength of the S0 mode by increasing the number of sensors up to six, and then remains constant at up to eight sensors. This suggests that a compromise can be found between sensor density and localization error.
机译:该工作提出了一种结构健康监测(SHM)电子系统,具有实时采集和处理,用于确定层压板中的冲击位置。这项工作的新颖性是使用LAMB波导模式S0的冲击位置误差的定量评估,实时捕获和处理多达八个压电传感器。差分时间用于最小化位置估计的误差函数。冲击能量与反对称(A0)模式的幅度相关,并且描述了电子设计以避免用于信号采集的饱和度。相同的电子系统被设计为通过足够的增益,带宽和信噪比来获取对称(S0)低电平信号。这种信号在5150m / s的频率分量上以高于270kHz的频率分量传播到1.4mm厚的铝层压板中,并且可以从A0模式区别区别来精确地计算差分到达时间。结果表明,通过增加高达六个的传感器的数量,本地化误差以与S0模式的波长相当的值稳定,然后在最多八个传感器上保持恒定。这表明可以在传感器密度和本地化误差之间找到折衷。

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