Measurement of dynamic characteristics of structure

Proceedings of the IEEE 2000 National Aerospace and Electronics Conference. NAECON 2000. Engineering Tomorrow (Cat. No.00CH37093) Pub Date : 2000-10-10 DOI:10.1109/NAECON.2000.894898

Xuezhi Yang, Puchiang Yan, Lei Yan, Jianmin Wang

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Abstract

A new type of low frequency vibration transducer (LFVT) and the signal processing procedure used in estimation of dynamic characteristics of structure are discussed. A circuit network is adopted in the LFVT to compensate the low frequency characteristics of seismic velocity transducer with high resonant frequency, reliability and robustness, which is the primary sensor. The output characteristics of LFVT are just like those of a seismic velocity or displacement transducer with very low resonant frequency which is 1/20 to 1/50 of that of the original pick-ups. Engineering estimation methods of natural frequency and vibration mode are discussed. An improved algorithm to determine the damping ratio is put forward. In the algorithm, we use the frequency response of a second order system to fit the estimated power spectra of the signal and solve the problem of nonlinearity in this process. The algorithm has a much better precision than the generally used bandwidth method. Experiments on a railway bridge are given.

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结构动力特性的测量

讨论了一种新型的低频振动传感器及其在结构动态特性估计中的信号处理方法。LFVT采用电路网络补偿地震速度传感器的低频特性，具有高谐振频率、可靠性和鲁棒性，是主要传感器。LFVT的输出特性与地震速度或位移传感器相似，谐振频率非常低，为原始拾音器的1/20至1/50。讨论了固有频率和振型的工程估计方法。提出了一种确定阻尼比的改进算法。在该算法中，我们利用二阶系统的频率响应来拟合信号的估计功率谱，并解决了该过程中的非线性问题。该算法比一般的带宽算法具有更高的精度。给出了在铁路桥上的试验结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of the IEEE 2000 National Aerospace and Electronics Conference. NAECON 2000. Engineering Tomorrow (Cat. No.00CH37093)

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