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首页> 外文会议>International Conference on Motion and Vibration Control >Inferring unstable equilibrium configurations from experimental data
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Inferring unstable equilibrium configurations from experimental data

机译：从实验数据推断不稳定的均衡配置

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This research considers the structural behavior of slender, mechanically buckled beams and panels of the type commonly found in aerospace structures. The specimens were deflected and then clamped in a rigid frame in order to exhibit snap-through. That is, the initial equilibrium and the buckled (snapped-through) equilibrium configurations both co-existed for the given clamped conditions. In order to transit between these two stable equilibrium configurations (for example, under the action of an externally applied load), it is necessary for the structural component to pass through an intermediate unstable equilibrium configuration. A sequence of sudden impacts was imparted to the system, of various strengths and at various locations. The goal of this impact force was to induce relatively intermediate-sized transients that effectively slowed-down in the vicinity of the unstable equilibrium configuration. Thus, monitoring the velocity of the motion, and specifically its slowing down, should give an indication of the presence of an equilibrium configuration, even though it is unstable and not amenable to direct experimental observation. A digital image correlation (DIC) system was used in conjunction with an instrumented impact hammer to track trajectories and statistical methods used to infer the presence of unstable equilibria in both a beam and a panel.
机译：该研究认为，纤细的结构性能，机械扣梁和类型的组，航空航天结构很常见。标本偏转，然后在刚性框架管理单元通过夹紧在为了发挥。也就是说，初始平衡和压曲（卡扣通）平衡构两者共存对于给定的夹紧条件。为了这两个稳定平衡配置之间中转（例如，从外部施加的载荷的作用下），它是必要的结构部件，以通过一个中间不稳定平衡的配置。突然冲击的序列赋予该系统的各种优势，并在不同的位置。这种冲击力的目标是诱导有效减慢的在不稳定的平衡配置的附近相对中间尺寸瞬变。因此，监视所述运动的速度，以及特别是其减慢，应该给平衡结构的存在的指示，即使它是不稳定的并且不适合于直接的实验观察。一种数字图像相关（DIC）系统一起使用的一个仪表的冲击锤以跟踪用于推断两者光束和面板不稳定平衡点的存在轨迹和统计方法。

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