Содержит справочные данные на биполярные и полевые транзисторы.
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11)) and the static deﬂection due to distributed load (obtained from a polynomial expression) are very 28 • Chapter 2 / Dynamic Response of Beams similar. It must not be a surprise, as the inertia loading of a vibrating beam is characterized by a continuous load. In many applications, it can be much easier to approximate the deﬂection function of a vibrating beam by a “static equivalent” deﬂection. Algebraic manipulations of the expressions are much easier then. Care must be taken when stresses are to be computed, as these are an outcome of double differentiation (with respect to x) of the deﬂection line.
10) shows that at very low excitation frequencies ( /ω0 → 0), x is in phase with the excitation, and the DLF is close to 1. This means that the mass is “following” the excitation, with almost no dynamic effects. At resonance ( /ω0 = 1) the displacement is 90 degrees ahead of the excitation, and the ampliﬁcation has a maximum. The value of this maximum is higher as the damping coefﬁcient is lower. In high excitation frequencies ( /ω0 → ∞) there is a 180-degree lag between the displacement and the excitation force, and the ampliﬁcation tend to 0.
Support. This is only a schematic representation. The spring element represents the stiffness of the structure, while the internal viscous (or structural) damping of the spring is represented by the separate damper. , ). 1 A Single Degree of Freedom System • 3 This is a complex expression (called also Transfer Function), which means that there is a phase difference between the excitation force and the displacement. 9) and is used extensively in engineering applications. 10) ω0 Note that in Eq.