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Estimation of Rotational Frequency Responses

机译：旋转频率响应的估计

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Rotational frequency response functions are potentially valuable for structural damage detection but are difficult to obtain because of the practical problems of applying a pure moment. In the literature various indirect methods of generating a moment have been presented. In one method a so-called 'T-block' is attached at the point where a moment input is required. Then a force applied to the T-block generates a moment together with a force at the connection point. As well as introducing a moment the T-block may also be used to measure an angular displacement. However, it is the rotational frequency response of the structure without the T-block that is required. The problem may be cast as a special case of excitation by multiple inputs determined from the applied forces and the stiffness and inertia properties of the T-block. The resulting equations are badly conditioned, but may be regularised using other measurements. The paper describes the methodology and the signal processing techniques required to estimate the rotational frequency response function. An experimental example is used to demonstrate the practical application of the method.
机译：旋转频率响应函数对于结构损伤的检测具有潜在的价值，但由于施加纯力矩的实际问题而难以获得。在文献中已经提出了产生力矩的各种间接方法。在一种方法中，所谓的“ T形块”连接在需要力矩输入的位置。然后，施加到T形块的力与连接点处的力一起产生力矩。除了引入力矩外，T形块还可用于测量角位移。但是，需要的是没有T形块的结构的旋转频率响应。该问题可能是由于通过施加的力以及T型块的刚度和惯性特性确定的多个输入引起的激励的特殊情况。所得方程的条件不好，但可以使用其他度量进行正则化。本文介绍了估计旋转频率响应函数所需的方法和信号处理技术。实验实例说明了该方法的实际应用。

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