Parametric Vibration and Vibration Reduction of Cables in Cable-stayed Space Latticed Structure  

作　　者：包艳 周岱 柳杰 

机构地区：[1]School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiaotong University

出　　处：《Journal of Shanghai Jiaotong university(Science)》2008年第2期145-149,共5页上海交通大学学报（英文版）

基　　金：The National Natural Science Foundation of China(No.10572091);The Key Project of Fund of Science and Technology Development of Shanghai(No.07JC14023)

摘　　要：Mechanical model and vibration equation of a cable in cable-stayed space latticed structure (CSLS) under external axial excitation were founded.Determination of the mass lumps and natural frequencies sup- plied by the space latticed structure (SLS) was analyzed.Multiple scales method (MSM) was introduced to analyze the characteristics of cable's parametric vibration,and the precise time-integration method (PTIM) was used to solve vibration equation.The vibration behavior of a cable is closely relative to the frequency ratio of the cable and SLS.The cable's parametric vibration caused by the external axial excitation easily occurs if the frequency ratio of the cable and SLS is in a certain range,and the cable's vibration amplitude varies greatly even if the initial disturbance supplied by SLS changes a little.Furthermore,the mechanical model and vibration equation of the composite cable system consisting of main cables and assistant cables were studied. The parametric analysis such as the pre-tension level and arrangement of the assistant cables was carried out. Due to the assistant cables,the single-cable vibration mode can be transferred to the global vibration mode, and the stiffness and damping of the cable system are enhanced.The natural frequencies of the composite cable system with the curve line arrangement of assistant cables are higher than those with the straight-line arrangement and the former is more effective than the latter on the cable's vibration suppression.Mechanical model and vibration equation of a cable in cable-stayed space latticed structure （CSLS） under external axial excitation were founded. Determination of the mass lumps and natural frequencies supplied by the space latticed structure （SLS） was analyzed. Multiple scales method （MSM） was introduced to analyze the characteristics of cable＇s parametric vibration, and the precise time-integration method （PTIM） was used to solve vibration equation. The vibration behavior of a cable is closely relative to the frequency ratio of the cable and SLS. The cable＇s parametric vibration caused by the external axial excitation easily occurs if the frequency ratio of the cable and SLS is in a certain range, and the cable＇s vibration amplitude varies greatly even if the initial disturbance supplied by SLS changes a little. Furthermore, the mechanical model and vibration equation of the composite cable system consisting of main cables and assistant cables were studied. The parametric analysis such as the pre-tension level and arrangement of the assistant cables was carried out. Due to the assistant cables, the single-cable vibration mode can be transferred to the global vibration mode, and the stiffness and damping of the cable system are enhanced. The natural frequencies of the composite cable system with the curve line arrangement of assistant cables are higher than those with the straight-line arrangement and the former is more effective than the latter on the cable＇s vibration suppression.

关 键 词：CABLE parametric vibration composite cable system axial excitation vibration suppression 

分 类 号：TU393.3[建筑科学—结构工程]