针对具有集中荷载作用的两端固定悬索在悬索端点外激励作用下悬索系统发生的强迫振动,研究了激励频率接近悬索主共振频率时,系统产生的主共振.1)采用多尺度法,得到了不同振型的主共振分叉图和主共振分叉点的解析解;2)通过实例计算,得到了悬索的不同振型的主共振分叉图和主共振分叉点位置.
With both ends of the cable built in and a concentrated load acting on, a forced vibration of the suspension cable system occurs under the external excitation from out of the cable rod ends. When its forced frequency approaches the primary resonance frequency of the cable, its primary resonance is investigated. The results are: 1) by adopting a multiple-dimensioned method, the analytical solution to the primary resonance bifurcation point and its graph for the modes of different ranks are obtained; 2) through computing instances, the primary resonance bifurcation graph and its bifurcation point position for the modes of all ranks are obtained.