Different methods, in part known from the literature, are reviewed, by which the inverse problem with sinusoidal forcing of linear second-order systems can be solved. Various geometrical relations are explained which may be used in plotting response curves with greater ease, speed, and accuracy. If response analysis has to be based on measurements of magnitude alone, integration of the magnitude versus frequency curve appears to form a convenient and accurate means. The limitations of an analysis based on magnitude curves alone are discussed.
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