Modal test analysis for an aqueduct bent structure under artificial excitation
GU Peiying1,2, DENG Chang1,2, WANG Lanlan1,2, TANG Lei1,2, WANG Jian1,2
1.Nanjing Hydraulic Research Institute, Nanjing 210029, China;
2.Key laboratory of Water Science and Engineering, Ministry of Water Resources, Nanjing 210029, China
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.
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 Peiying1,2, DENG Chang1,2, WANG Lanlan1,2, TANG Lei1,2, WANG Jian1,2. Modal test analysis for an aqueduct bent structure under artificial excitation. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(7): 146-154.
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