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Zhiyi Zhang

Bio: Zhiyi Zhang is an academic researcher from Shanghai Jiao Tong University. The author has contributed to research in topics: Vibration & Vibration isolation. The author has an hindex of 17, co-authored 76 publications receiving 996 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a nonlinear isolator with Euler buckled beams as negative stiffness corrector was used to determine the primary resonance response for the single degree of freedom (SDOF) nonlinear system composed by a loaded mass and the nonlinear isolateator.

211 citations

Journal ArticleDOI
TL;DR: In this article, a Stewart platform with piezoelectric actuators is presented for micro-vibration isolation, where the direct feedback of integrated forces is combined with the FxLMS based adaptive feedback to dampen vibration of inherent modes.

76 citations

Journal ArticleDOI
TL;DR: In this article, the dynamic response of a high-static-low-dynamic stiffness (HSLDS) isolator formed by parallelly connecting a negative stiffness corrector which uses compressed Euler beams to a linear isolator is investigated.
Abstract: The dynamic response of a high-static-low-dynamic stiffness (HSLDS) isolator formed by parallelly connecting a negative stiffness corrector which uses compressed Euler beams to a linear isolator is investigated in this study. Considering stiffness and load imperfections, the resonance frequency and response of the proposed isolator are obtained by employing harmonic balance method. The HSLDS isolator with quasi-zero stiffness characteristics can offer the lowest resonance frequency provided that there is only stiffness or load imperfection. If load imperfection always exists, there is no need to make the stiffness to zero since it cannot provide the lowest resonance frequency any longer. The reason for this unusual phenomenon is given. The dynamic response will exhibit softening, hardening, and softening-to-hardening characteristics, depending on the combined effect of load imperfection, stiffness imperfection, and excitation amplitude. In general, load imperfection makes the response exhibit softening characteristic and increasing stiffness imperfection will weak this effect. Increasing the excitation level will make the isolator undergo complex switch between different stiffness characteristics.

65 citations

Journal ArticleDOI
TL;DR: In this article, order estimation and spurious mode elimination concerning the subspace identification technique are discussed in order to avoid underestimating the state space model order, order estimate is given in terms of component energy index rather than matrix singular values.

62 citations

Journal ArticleDOI
TL;DR: In this paper, a nonlinear isolator with Euler buckled beams as negative stiffness corrector is proposed for half-sine shock input and the performance of the nonlinear isolateator is evaluated by the absolute acceleration response of the mass and the relative displacement of the isolator.

52 citations


Cited by
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30 Sep 1986
TL;DR: In this paper, the authors used the canonical M, K form of the undamped motion equations to model viscoelastic damping and used finite element analysis to model the damping factors.
Abstract: Mathematical models of elastic structures have become very sophisticated: given the crucial material properties (mass density and the several elastic moduli), computer-based techniques can be used to construct exotic finite element models. By contrast, the modeling of damping is usually very primitive, often consisting of no more than mere guesses at “modal damping factors.” The aim of this paper is to raise the modeling of viscoelastic structures to a level consistent with the modeling of elastic structures. Appropriate material properties are identified which permit the standard finite element formulations used for undamped structures to be extended to viscoelastic structures. Through the use of “dissipation” coordinates, the canonical “M , K ” form of the undamped motion equations is expanded to encompass viscoelastic damping. With this formulation finite element analysis can be used to model viscoelastic damping accurately.

339 citations

Journal ArticleDOI
TL;DR: Reading this tutorial is expected to get a flavour of what moving-load problems are about, what general methods are available and what research has been done from studying this tutorial.

305 citations

Journal ArticleDOI
TL;DR: In this article, three methods, smart persistence, artificial neural network and random forest, are compared to forecast the three components of solar irradiation (global horizontal, beam normal and diffuse horizontal) measured on the site of Odeillo, France, characterized by a high meteorological variability.

233 citations

Book
01 Jan 1913

223 citations

Journal ArticleDOI

204 citations