Nonlinear vibration isolator with adjustable restoring force

Araki, Yoshikazu; Asai, Takahiro; Kimura, Kosuke; Maezawa, Kosei; Masui, Takeshi

doi:10.1016/j.jsv.2013.06.030

Cited by 39 publications

(28 citation statements)

References 27 publications

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“…The detailed investigations on designs, practical techniques and performance of nonlinear suspension systems were reported quite late, see, for example, Alabuzhev et al (1989), Platus (1992), Zhang et al (2004), Carrela, Brennan & Waters (2007), Carrela et al (2008), Kovaic, Brennan & Waters (2008), Ahn (2008), Cao et al (2008ab), Liu, Chen & Cao (2010). More recently, Araki et al (2013) presented the effective designs of quasizero-stiffness vibration isolators for their restoring forces to satisfy the conditions resisting large self-weight and to have the tangent stiffness close to zero around the static equilibrium position. In this paper, more published references on quasizero-stiffness vibration isolators were introduced, which involves the designs using geometric nonlinearity, magnets and shape memory alloys.…”

Section: Interests For Nonlinearitiesmentioning

confidence: 99%

Energy Flow Theory of Nonlinear Dynamical Systems with Applications

Xing

2015

Emergence, Complexity and Computation

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com/mycopyOrder online at springer.com ▶ or for the Americas call (toll free) 1-800-SPRINGER ▶ or email us at: customerservice@springer.com. ▶ For outside the Americas call +49 (0) 6221-345-4301 ▶ or email us at: customerservice@springer.com.The first € price and the £ and $ price are net prices, subject to local VAT. Prices indicated with * include VAT for books; the €(D) includes 7% for Germany, the €(A) includes 10% for Austria. Prices indicated with ** include VAT for electronic products; 19% for Germany, 20% for Austria. All prices exclusive of carriage charges. Prices and other details are subject to change without notice. All errors and omissions excepted. This monograph develops a generalised energy flow theory to investigate non-linear dynamical systems governed by ordinary differential equations in phase space and often met in various science and engineering fields. Important nonlinear phenomena such as, stabilities, periodical orbits, bifurcations and chaos are tack-led and the corresponding energy flow behaviors are revealed using the proposed energy flow approach. As examples, the common interested nonlinear dynamical systems, such as, Duffing's oscillator, Van der Pol's equation, Lorenz attractor, Rössler one and SD oscillator, etc, are discussed. This monograph lights a new energy flow research direction for nonlinear dynamics. A generalised Matlab code with User Manuel is provided for readers to conduct the energy flow analysis of their nonlinear dynamical systems. Throughout the monograph the author continuously returns to some examples in each chapter to illustrate the applications of the discussed theory and approaches. The book can be used as an undergraduate or graduate textbook or a comprehensive source for scientists, researchers and engineers, providing the statement of the art on energy flow or power flow theory and methods. J.T. Xing Energy Flow Theory of Nonlinear Dynamical Systems with Applications

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Section: Interests For Nonlinearitiesmentioning

confidence: 99%

Energy Flow Theory of Nonlinear Dynamical Systems with Applications

Xing

2015

Emergence, Complexity and Computation

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“…The second type of flag‐shaped hysteretic loop included in this study was proposed and investigated by Cordone and Araki et al . The hysteretic force in this flag‐shaped hysteretic model can be considered as the sum of the two components (Figure ): a BL elastic component with an RPP component, which remains approximately constant during cyclic deformation .…”

Section: Selection Of Isolation Devicesmentioning

confidence: 99%

Influence of isolation hysteresis on the seismic performance of isolated buildings

Chen

Yang

Shi

2014

Struct. Control Health Monit.

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Summary Seismic isolation is one of the most used protective technologies for earthquake engineering. Many innovative devices have been researched and implemented. Selection of the different isolation devices is commonly based on engineering experience, where no detailed and systematic comparison has been provided. In this paper, the seismic performances of a three‐story office building isolated using five different devices were evaluated. The isolation devices included the bilinear, flag‐shaped I, flag‐shaped II, crystallizing rubber (CR), and rigid‐perfectly plastic (RPP) models. These isolation devices were designed to achieve an equivalent performance at the seismic shaking intensity of 2% probability of exceedance in 50 years. The evaluation was conducted using the state‐of‐the‐art assessment procedure at 2%, 10%, and 50% probability of exceedance in 50 years (50/50, 10/50, and 2/50) hazard levels. The results indicated that all the isolators performed well by limiting the financial losses. At both the 50/50 and 10/50 shaking intensities, the building with CR isolators experienced no repair costs, while those with bilinear, flag‐shaped I, flag‐shaped II, and RPP isolators had minor repair costs contributed from the content performance groups. At the 2/50 shaking intensity, all isolators incurred minor damages in the content performance groups. The building with CR isolators had additional repair costs because of the interior drift sensitive nonstructural components, while the building with the RPP isolators had repair costs contributed from the interior drift and acceleration sensitive nonstructural components and the acceleration sensitive equipment at the roof. Copyright © 2014 John Wiley & Sons, Ltd.

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“…Hence, the restoring force of the isolator can be adjustable by changing θ . The authors realized this variable mechanism by using cranks and a screw jack for the vertical vibration isolator and verified its effectiveness through shaking table tests and numerical simulations . Also, a similar mechanism was realized by using superelastic Cu‐Al‐Mn shape memory alloy bars instead of constant‐force springs .…”

Section: Introductionmentioning

confidence: 97%

“…To increase the limit of the load capability of the device, the authors proposed a device with an amplification mechanism . The basic idea of the device lies in converting the horizontal restoring force of the constant‐force springs to the vertical direction.…”

Section: Introductionmentioning

confidence: 99%

Adjustable vertical vibration isolator with a variable ellipse curve mechanism

Asai

Araki

Kimura³

et al. 2017

Earthq Engng Struct Dyn

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Summary This paper presents a passive vertical quasi‐zero‐stiffness vibration isolator intended for relatively small objects. The present isolator has features of compactness, long stroke, and adjustability to various load capabilities. To realize these features, we use constant‐force springs, which sustain constant load regardless of their elongation, and propose a variable ellipse curve mechanism that is inspired by the principle of ellipsographs. The variable ellipse curve mechanism can convert the restoring force of the horizontally placed constant‐force springs to the vertical restoring force of the vibration isolator. At the same time as converting the direction, the vertical restoring force can be adjusted by changing the ratio of the semi‐minor axis to the semi‐major one of the ellipse. In this study, a prototype of a class of quasi‐zero‐stiffness vibration isolator with the proposed variable ellipse curve mechanism is created. Shaking table tests are performed to demonstrate the efficacy of the present mechanism, where the prototype is subjected to various sinusoidal and earthquake ground motions. It is demonstrated through the shaking table tests that the prototype can reduce the response acceleration within the same specified tolerance even when the mass of the vibration isolated object is changed. Copyright © 2017 John Wiley & Sons, Ltd.

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Nonlinear vibration isolator with adjustable restoring force

Cited by 39 publications

References 27 publications

Energy Flow Theory of Nonlinear Dynamical Systems with Applications

Energy Flow Theory of Nonlinear Dynamical Systems with Applications

Influence of isolation hysteresis on the seismic performance of isolated buildings

Adjustable vertical vibration isolator with a variable ellipse curve mechanism

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