About the Nonunique Sensitivity of Pendulum Seismometers to Translational, Angular, and Centripetal Acceleration
About the Nonunique Sensitivity of Pendulum Seismometers to Translational, Angular, and Centripetal Acceleration
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关于摆式地震仪对平动加速度、角加速度和向心加速度的非唯一敏感性
DOI：
10.1785/0120080150
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发表时间：
2009
影响因子：
3
通讯作者：
T. Forbriger
中科院分区：
文献类型：
--
作者：
T. Forbriger
对于纯平移运动，地震仪框架各部分的位移是相同的。然而，在存在旋转运动的情况下，地震仪框架的不同部分将发生不同的位移。然后，地震仪灵敏度的定义需要在地震仪的框架上选择灵敏度归属的参考位置。这个位置不一定与铰链重合，可以任意选择。适当的选择是将输出信号归因于等效单摆（或简化摆）的点质量位置，它通常位于地震仪的外壳内。由于角加速度或向心加速度，传感器在此位置的旋转不会产生输出信号。传感器似乎只对线性加速度敏感。
Abstract The displacement of each part of a seismometer’s frame is identical for a purely translational motion. However, in the presence of rotary motion the different parts of a seismometer’s frame will undergo different displacements. The definition of the sensitivity of the seismometer then requires the selection of a reference location on the seismometer’s frame to which the sensitivity is attributed. This location does not necessarily coincide with the hinge and can be selected arbitrarily. The appropriate choice is to attribute the output signal to the location of the point mass of the equivalent simple pendulum (or reduced pendulum), which usually lies within the seismometer’s casing. Rotations of the sensor about this location produce no output signal due to angular or centripetal acceleration. The sensor then appears sensitive to linear acceleration only.