论文标题
噪声对光束的仅输出模态识别的影响
Effect of noise on output-only modal identification of beams
论文作者
论文摘要
在大多数情况下，结构健康监测取决于确定结构前几个模式的模态参数。通过仅输出方法识别这些模式的数据包括结构响应与噪声一起。结构响应中噪声的存在会影响模态参数。进行了当前的研究以检查在存在噪声下识别光束模态参数的可能性和准确性。为此，使用具有不同信噪比的输出数据获得了不同模式的单跨光束模式的模态参数。通过瞬态分析获得加速信号，然后产生不同的噪声能力并添加到信号中。梁的模态参数是使用仅输出方法获得的。确定了所有所考虑模式的信噪比大于13.98 dB的参数。在信噪比为-6.02至13.98 dB（较高噪声水平）时，无法识别第一个梁模式的模态参数，但是较高模式的参数以良好的精度识别。
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.
