渡槽排架结构人工激励模态试验分析

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (7) : 146-154.

论文

渡槽排架结构人工激励模态试验分析

顾培英1,2，邓昌1,2，王岚岚1,2，汤雷1,2，王建1,2

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Modal test analysis for an aqueduct bent structure under artificial excitation

GU Peiying1,2, DENG Chang1,2, WANG Lanlan1,2, TANG Lei1,2, WANG Jian1,2

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摘要

开展渡槽排架单向单输入多输出SIMO法、双向多输入多输出MIMO法人工激励模态试验，选用特征系统实现法识别纵向、横向、双向模态参数，结果表明，单向SIMO法稳定图绝大多数谱峰明显、模态识别效果较好，纵向模态比横向丰富、识别效果好；双向MIMO法纵向谱峰大多数明显，横向除双向第2阶(即横向第1阶)谱峰明显外，其他基本很小，尤其是横向模态频率接近纵向时，甚至无谱峰，只识别出纵向模态；排架结构以排架柱弯曲振动为主，纵向低阶、高阶模态横梁分别以平动或转动刚体振动、弯曲振动为主，横向模态横梁为平动或不动刚体振动；两种方法识别出的模态频率误差较小，模态阻尼在正常范围，但双向MIMO法部分横向模态未能准确识别。从识别精度、试验工作量及操作便捷性而言，排架结构人工激励模态试验选择单向SIMO法优于双向MIMO法。

Abstract

Modal tests with SIMO method in a single direction and MIMO method in bi-direction under artificial excitation were conducted for an aqueduct bent structure. Longitudinal,transverse and bi-directional modal parameters were identified with the eigen-system realization algorithm. The results showed that most spectral peaks of stabilization diagrams are obvious using SIMO method,modal identification effects are better,longitudinal modes are richer than transverse modes; the most spectral peaks of longitudinal modes are obvious using MIMO method,but those of transverse modes are small except for the bidirectional second order mode,i.e.,the transverse first order one; if transverse modes’ frequencies are close to those of longitudinal modes,they have no spectral peaks,only longitudinal modes are identified; bent structure’s modes mainly are its column’s bending vibrations; its beam’s lower and higher order longitudinal modes mainly are translation vibration or rotating rigid body one and bending one,respectively; the beam’s transverse modes are translation vibration or stationary rigid body one; modal frequencies identified using SIMO and MIMO methods have small errors; identified modal damping is within a normal range; partial transverse modes can’t be correctly identified using MIMO method; the SIMO method in a single direction is better than the MIMO method in bi-direction for bent structures’ modal tests under artificial excitation,the former has a higher identification accuracy,costs less time and is easy to operate.

导出引用

顾培英1,2，邓昌1,2，王岚岚1,2，汤雷1,2，王建1,2. 渡槽排架结构人工激励模态试验分析[J]. 振动与冲击, 2019, 38(7): 146-154

GU Peiying1,2, DENG Chang1,2, WANG Lanlan1,2, TANG Lei1,2, WANG Jian1,2. Modal test analysis for an aqueduct bent structure under artificial excitation[J]. Journal of Vibration and Shock, 2019, 38(7): 146-154

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