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Reliability of the Tensile Force Identification in Ancient Tie-Rods Using One Flexural Mode Shape

机译:一种使用一种弯曲模式形状古领带棒中拉伸力识别的可靠性

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摘要

This article presents an investigation into the reliability of an experimental procedure for the axial load identification of tie-rods with unknown boundary conditions, that uses one vibration frequency and five amplitudes of the corresponding mode shape. The method adopted does not require the knowledge of the effective length of the tie-rod under examination, but only the flexural rigidity and the mass per unit length. In particular, the influence of measurement errors as well as of inaccurate estimates of geometric and elastic properties on the accuracy of the axial force identification is investigated. The effect of the added mass of the sensors is also analyzed. The proposed algorithm is verified by means of many numerical tests on ancient tie-rods having large scatter values of geometric and elastic properties. Good estimates of the axial forces are obtained. Moreover, it is shown that the reliability of the tensile force identification, using one flexural mode shape, relies on the magnitude of the measurement errors rather than on accurate guess of Young modulus.
机译:本文提出了对具有未知边界条件的轴向载荷的轴向载荷识别实验程序的可靠性的调查,它使用一个振动频率和相应模式形状的五个振幅。采用的方法不需要在检查下的拉杆的有效长度的知识,但只有弯曲刚度和每单位长度的质量。特别地,研究了测量误差以及在轴向力识别精度的几何和弹性性质的不准确估计的影响。还分析了所添加的传感器的效果。通过具有大散射值的几何和弹性特性的散射值,通过许多数值测试来验证所提出的算法。获得轴向力的良好估计。此外,示出使用一种弯曲模式形状的拉伸力识别的可靠性依赖于测量误差的大小而不是准确猜测幼年模量。

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