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A frequency response function (FRF) is a transfer function, expressed in the frequency-domain. Frequency response functions are complex functions, with real and imaginary components. They may also be represented in terms of magnitude and phase. A frequency response function can be formed from either measured data or analytical functions.


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FRF Based Experimental - Analytical Dynamic Substructuring Using Transmission Simulator Krishna Chaitanya Konjerla Master's Degree Project TRITA-AVE 2016:42 ISSN 1651-7660


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• The FRF can be used to find the steady-state response of a system to a sinusoidal input since, if e(t) y(t) G(s) and e(t) = sin2t, |G(2j)| = 0.3, G(2j) = −80 , then the steady-state output is y(t) = 0.3sin(2t − 80 ) ⇒ The FRF clearly shows the magnitude (and phase) of the re­ sponse of a system to sinusoidal input


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FRF性质. 频响函数FRF具有以下性质:. 1) 频响函数定义为输入位置单位激励力引起的输出位置的响应。. 2) 频响函数是系统的固有特性,与系统本身有关,与激励、响应等外界因素没有关系。. 3) 频响函数具有互易性,即Hij=Hji,也就是说,'j'点单位激励力在'i.


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The frequency response function (FRF) is a fundamental property of a linear time-invariant system that describes the system's frequency-dependent behavior. Accurately measuring the FRF of multivariable lightly damped systems in a time-efficient manner is difficult due to spectral leakage and long-lasting transient phenomena. In the past, local rational modeling techniques have been introduced.


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A Frequency Response Function (or FRF), in experimental modal analysis is shown in Figure 1: is a frequency based measurement function. used to identify the resonant frequencies, damping and mode shapes of a physical structure. sometimes referred to a "transfer function" between the input and output.


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This tutorial demonstrates the capability of frequency response optimization using OptiStruct. Initially, an existing finite element (FE) model of a flat plate is retrieved and modal frequency response analysis is performed to derive the peak magnitude. A dynamic response optimization is then performed on the same plate to obtain a new design.