Analysis of Forced Vibration by Reduced Impedance Method : Part 2. Introduction of New Curve Fitting Technique

概要

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The analytical expression and representation of the dynamic characteristics of the frequency responses are discussed. All frequency responses are expressed as superposition of the dynamic responses of the systems with one degree of freedom. First, a method is introduced to represent the natural frequencies and the equivalent stiffness of the undamped responses calculated numerically by the reduced impedance method. Next, the usual method of curve fitting is improved to represent the natural frequencies, the equivalent stiffness and the equivalent damping ratios of the damped responses determined experimentally. The least square technique is adopted on the methods proposed in the present report in order to minimize the errors which appear in representation of the response curve with the dynamic characteristics. The present methods are applied to several model structures, and usefulness of these methods is proved as the result.
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