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中文摘要：
斜拉索振动中的＂跳跃＂现象是一种典型的非线性行为.虽然,在以往的理论和实验研究中已发现该现象,但是,却没有直接观测到其发生的过程.为探究斜拉索＂跳跃＂过程及该过程中的非线性动力行为,根据动力相似理论的弹性力-重力相似律设计了斜拉索实验模型.通过在扫频试验中使激励频率恰好等于＂跳跃＂的临界频率,直接观测到斜拉索自发发生的＂跳跃＂过程.对空间运动形态变化规律和特征的研究发现：斜拉索＂跳跃＂过程空间运动不仅仅是振幅突然改变,而是经历了面内外振幅急剧减小、面内外振动交替占主导及＂气圈＂运动逆顺时针交替变换3个阶段.
英文摘要：
Jump phenomenon is a representative nonlinear behavior of inclined cable.Although it has been discovered both in theory and experiment,jumping course is yet to be observed.An experiment was carried out to directly observe the jumping course and to ascertain nonlinear behaviors in this course.An automatic jump was directly observed by continuously repeating the sweep testing to make one of the excitation frequencies just right equal to the threshold frequency.Attributes of spatial motion during the jumping course were investigated.It is found that the spatial motion goes through three stages in the course,no merely sharp changes of the response amplitude as traditionally believed.These stages are：sharp changes of the response amplitude,dominative motion alternate between the out-of-plane and in-plane vibrations,and balloon motion alternate between the clockwise and anticlockwise directions.
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