Technique for Determining Bridge Displacement Response Using MEMS Accelerometers.
Technique for Determining Bridge Displacement Response Using MEMS Accelerometers.
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DOI：
10.3390/s16020257
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发表时间：
2016-02-19
期刊：
影响因子：
--
通讯作者：
Miki C
中科院分区：
文献类型：
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作者：
Sekiya H;Kimura K;Miki C
在桥梁维护中，尤其是在钢桥疲劳损伤方面，确定整个桥梁在活载作用下的位移响应以及各个构件的位移响应是非常重要的。了解位移响应能够识别可能引起应力并最终导致破坏的动态变形，从而也可以采取适当的对策。从理论上讲，位移响应可以通过测量的加速度的双重积分来计算。然而，由加速度计测量的数据包括由模数转换过程的限制和传感器噪声引起的测量误差。这些误差扭曲了二次积分结果。此外，由于在役桥梁由于过往车辆的作用而不断发生振动，因此很难估计数值积分的边界条件。为了解决这些问题，本文提出了一种基于在役桥梁自由振动的加速度来确定在役桥梁位移的方法。为了验证该方法的有效性，使用9个不同的加速度计进行了现场测量。基于这些测量的结果，发现与使用接触式位移计获得的基准位移相比，所提出的方法具有很高的精度。
In bridge maintenance, particularly with regard to fatigue damage in steel bridges, it is important to determine the displacement response of the entire bridge under a live load as well as that of each member. Knowing the displacement response enables the identification of dynamic deformations that can cause stresses and ultimately lead to damage and thus also allows the undertaking of appropriate countermeasures. In theory, the displacement response can be calculated from the double integration of the measured acceleration. However, data measured by an accelerometer include measurement errors caused by the limitations of the analog-to-digital conversion process and sensor noise. These errors distort the double integration results. Furthermore, as bridges in service are constantly vibrating because of passing vehicles, estimating the boundary conditions for the numerical integration is difficult. To address these problems, this paper proposes a method for determining the displacement of a bridge in service from its acceleration based on its free vibration. To verify the effectiveness of the proposed method, field measurements were conducted using nine different accelerometers. Based on the results of these measurements, the proposed method was found to be highly accurate in comparison with the reference displacement obtained using a contact displacement gauge.