噪声对梁只输出模态识别的影响
Effect of noise on output-only modal identification of beams
摘要：
在大多数情况下，结构健康监测取决于结构的前几个模态的模态参数的确定。用于通过仅输出方法识别这些模式的数据包括结构响应以及噪声。结构响应中噪声的存在影响模态参数。本文研究了在噪声环境下识别梁的模态参数的可能性和准确性。为此，单跨梁的不同模式的模态参数，获得不同的信噪比的输出数据。通过瞬态分析获得加速度信号，然后产生不同功率的噪声并添加到信号中。梁的模态参数是用输出法得到的。确定了所有模式的信噪比大于13.98 dB的参数。在信噪比为-6.02至13.98 dB（较高的噪声水平）时，无法识别梁的第一模式的模态参数，但较高模式的参数被识别为具有良好的精度。
英文摘要：
In most cases, structural health monitoring depends on the determination of the modal parameters of the first few modes of a structure. The data that are used to identify these modes by output-only methods include the structure response together with noise. The presence of noise in the structure response affects the modal parameters. The current study was undertaken to examine the possibility and accuracy of identifying the modal parameters of beams in the presence of noise. For this purpose, the modal parameters of the different modes of single-span beams were obtained using output data with different signal-to-noise ratios. The acceleration signals were obtained by transient analysis and then different powers of noise were generated and added to the signals. The modal parameters of the beams were obtained using output-only methods. Parameters having signal-to-noise ratios of greater than 13.98 dB for all modes considered were identified. At a signal-to-noise ratio of -6.02 to 13.98 dB (higher noise level), it was not possible to identify the modal parameters of the first mode of beams, but the parameters of the higher modes were identified with good accuracy.
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