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Vibration analysis of beams with open and breathing cracks subjected to moving masses

机译:移动质量作用下具有开裂和呼吸裂纹的梁的振动分析

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This paper presents an analytical approach, as well as a calculation method for determining the dynamic response of the undamped Euler-Bernoulli beams with breathing cracks under a point moving mass using the so-called discrete element technique (DET) and the finite element method (FEM). First, the standard DET formulation is modified to consider the effects of Coriolis and centrifugal forces. Next, the formulation is extended to be able to evaluate the cases with open and breathing cracks under moving masses. The results will be validated against those reported in the literature and also compared with results from the finite element method. The effects of the moving mass velocity, location, and size of the crack on beam deflection will be investigated. Natural frequencies of the beam under the effect of crack will also be studied to compare the results with those of a beam without crack. It is observed that the presence of crack results in higher deflections and alters beam response patterns. In particular, the largest deflection in the beam for a given speed takes longer to build up, and a discontinuity appears in the slope of the beam deflected shape at the crack location. The effects of crack and load depend on speed, time, crack size, crack location, and the moving mass level.
机译:本文提出了一种分析方法以及一种计算方法,该方法使用所谓的离散元技术(DET)和有限元方法来确定点移动质量下具有阻尼裂纹的无阻尼Euler-Bernoulli梁的动力响应。有限元)。首先,修改标准DET公式以考虑科里奥利(Coriolis)和离心力的影响。接下来,扩展了公式,以便能够评估在移动的质量下具有开裂和呼吸裂纹的情况。将对照文献报道的结果验证结果,并与有限元方法的结果进行比较。将研究移动质量速度,裂纹的位置和大小对梁挠度的影响。还将研究在裂纹作用下的梁的固有频率,以将结果与无裂纹的梁的固有频率进行比较。可以看出,裂纹的存在会导致较高的挠度并改变光束响应模式。特别是,在给定速度下,梁中最大的偏转需要更长的时间才能建立,并且在裂纹位置处梁偏转形状的斜率中会出现不连续性。裂纹和载荷的影响取决于速度,时间,裂纹尺寸,裂纹位置和移动质量水平。

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