Topic
Damping ratio
About: Damping ratio is a research topic. Over the lifetime, 4869 publications have been published within this topic receiving 63192 citations.
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TL;DR: In this paper, the damping properties of carbon fiber reinforced polymer composites (CFRP) and nanocomposites containing multiwall carbon nanotubes (CNTs) were studied using the free and forced vibration tests.
249 citations
TL;DR: In this article, a nonlinear magnetic low-frequency vibration isolator with the characteristic of quasi-zero stiffness (QZS) is proposed and a unique analytical relationship between the stiffness of vertical spring and initial gap settings of the magnet springs is derived for the QZS system.
238 citations
TL;DR: In this paper, the stability boundary of TMD-structure systems subject to linear self-excited forces is derived in a closed form using the perturbation solutions, procedures for optimizing the TMD parameters for various types of loading are explained and the optimal values are derived.
Abstract: Modal properties of tuned mass damper (TMD)-structure two-degree-of-freedom (2DOF) linear systems are studied employing a perturbation technique. Using the perturbation solutions, formulas relevant to designing the TMD for various types of loading are obtained; they are expressed as a function of mass ratio, tuning ratio, damping ratio of the TMD and damping ratio of the structure. Equivalent additional dampings of the structure due to the TMD are derived for random and harmonic forces. Matched expressions of equivalent damping, which are valid for detuned, i.e. non-optimal, conditions are also presented. The stability boundary of TMD-structure systems subject to linear self-excited forces is derived in a closed form. Using the perturbation solutions, procedures for optimizing the TMD parameters for various types of loading are explained and the optimal values are derived. The formulas obtained in this study can be used with good accuracy for mass ratios less than 0.02.
235 citations
TL;DR: In this article, an RDT ranked by peak amplitude is proposed for directly and effectively evaluating the amplitude dependences of dynamic phenomena, and the proposed technique is applied to wind-induced response data of three towers and the results are compared with those of the traditional technique.
233 citations
TL;DR: In this paper, a systematic experimental study has been conducted for dynamic properties of natural soft clay employing an improved cyclic triaxial apparatus to reveal the following important facts: (1) the rate of time-dependent increase of the shear modulus of clay can be approximated by a simple experimental equation in which only plasticity index is used.
223 citations