The simplest of the systems studied by structural dynamics is the linear mechanical oscillator with a single degree of freedom consisting of a point mass suspended by a linear spring and, possibly, a viscous damper (Figure 1-la). Historically, however, the mathematical pendulum (Figure 1-1c) represented for centuries the most common paradigm of an oscillator, which could be assumed to be linear, at least within adequate limitations.
KeywordsPower Spectral Density Force Function Supporting Point Dynamic Stiffness Harmonic Excitation
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