Full-Scale Dynamic Tests of Tuned Viscous Mass Damper With Force Restriction Mechanism and Its Analytical Verification

Kida, Hidenori; Watanabe, Yoshihito; Nakaminami, Shigeki; Tanaka, Hisaya; Sugimura, Yoshifumi; Saito, Kenji; Ikago, Kohju; Inoue, Norio

doi:10.3130/aijs.76.1271

Cited by 27 publications

(12 citation statements)

References 3 publications

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“…They found that the system could cause substantial mass magnification and a significant increase in modal damping. Kida et al introduced an improved TVMD with a force restriction mechanism (FRTVMD) to avoid excessive stresses and performed full‐scale dynamic tests on the seismic control system. They found that the excessive response force of TVMD generated through resonance could be limited by adjusting the axial force applied to the coned disk springs holding the frictional material.…”

Section: Introductionmentioning

confidence: 99%

Design of structure with inerter system based on stochastic response mitigation ratio

Pan

Zhang

2018

Struct Control Health Monit

113

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Summary An easy‐to‐use method for a practical design of single‐degree‐of‐freedom (SDOF) structures with inerter systems was developed. The method adopts the stochastic vibration response mitigation ratio as the design index, and expressions of the closed‐form stochastic response are used to evaluate the structural response and optimize the design parameters. Three basic types of inerter systems with tuning and damping magnification mechanisms were considered in this study. The closed‐form stochastic responses of SDOF structures with inerter systems under white‐noise excitations were derived on the basis of the equations of motion. In addition, the response variation patterns due to changes in key parameters of the inerter system were investigated, and the parameter optimization approaches for different inerter systems are proposed on the basis of the response variation patterns. The use of the closed‐form stochastic response mitigation ratio as the design index leads to a rational and simple design process, with the tuning or response extremum conditions employed as complementary conditions for determining the key design parameters. Thus, the proposed method involves the solution of a set of nonlinear equations. Fitted empirical design formulae are provided in this paper for quick calculation of the key parameters of the SDOF structure with the inerter system for a given response mitigation ratio and inherent damping ratio. Moreover, design examples are provided to verify the proposed method. The design results show that the proposed method is effective and more convenient than existing methods. Furthermore, the method can be easily extended for considering seismic excitations and design of structures with other complex‐form inerter systems.

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Section: Introductionmentioning

confidence: 99%

Design of structure with inerter system based on stochastic response mitigation ratio

Pan

Zhang

2018

Struct Control Health Monit

113

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“…However, a concern with the TVMD system is the excessive response of the damper's force due to the resonance of the secondary system. To avoid this, an improved TVMD with a force restriction mechanism was introduced by Kida et al…”

Section: Introductionmentioning

confidence: 99%

Demand-based optimal design of oscillator with parallel-layout viscous inerter damper

Pan

Zhang

Luo

et al. 2017

Struct Control Health Monit

119

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SummaryIn this study, a demand-based optimal design method is proposed for an oscillator (a single-degree-of-freedom system) with a parallel-layout viscous inerter damper (PVID). The proposed design method overcomes some deficiencies of the existing method, which is based on the fixed-point theory and is mainly suitable for tuned mass dampers. Moreover, for the fixed-point method, the inherent damping of the primary structure is neglected, and the global optimal solution cannot be obtained.The proposed method can obtain a more rational and practical design for the actual design by minimizing both the response and the cost. The design problem of a PVID-equipped oscillator is transformed into a multi-objective optimization problem that can be solved using the ε-constraint approach, which is consistent with the concept of demand-based design. The dynamic response of the oscillator and the force of the PVID (i.e., the cost factor) are evaluated according to theories of random vibration to reduce the number of calculations required. A computer program is developed to perform demand-based parametric design of a PVID-equipped oscillator. Several design cases were examined under different excitation conditions using the computer program, and dynamic time history analyses were then conducted to verify the designs obtained. The results show that the proposed optimal design method identifies satisfactory designs more effectively than the existing method by obtaining PVID design parameter values that better meet the performance demand and simultaneously minimize the cost. | INTRODUCTIONStructural vibrations induced by earthquake or wind loads can be attenuated by various means, including modifying the stiffness, masses, damping, or shape of the structure, and by providing passive or active counter forces.[1] Among numerous available methods, passive mitigation measures are the most widely used in building and bridge engineering. Passive vibration mitigation involves providing a structure with additional damping by installing dampers, and the effectiveness of damping has been confirmed by extensive scientific studies and practical applications. Many types of dampers are used in the passive vibration mitigation of building structures all over the world, such as metalyield dampers, friction dampers, viscoelastic dampers, viscous fluid dampers, tuned mass dampers, and tuned liquid dampers. The concept of tuned mass dampers dates back to the 1900s, when Frahm [2] introduced a tuned mass damper (TMD) to absorb the energy of vibrations, thereby reducing the amplitudes of motions. Den Hartog [3] modified the original TMD concept in the

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“…Commonly adopted methods include the use of components with higher stiffness, viscous damping, tuned mass dampers (TMDs). TMDs [14][15][16] can be set within floor structures with a view to attenuate the inherent vibration response. A typical TMD comprises a mass element, damping element, and spring element; it is attached to the floor structure and absorbs floor vibration energy by tuning the frequency of the floor structure.…”

Section: Introductionmentioning

confidence: 99%

Comfort based floor design employing tuned inerter mass system

Chen

Zhao

Xia

et al. 2019

Journal of Sound and Vibration

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A comfort-based optimal method has been developed for designing floors using tuned inerter mass systems (TIMS) to reduce the vertical-vibration response of floors subjected to human-induced excitations. Acceleration response of the floor and output force of TIMS were first derived via stochastic analysis. Subsequently, variation patterns in acceleration-response and output-force ratios were studied and compared by changing values of TIMS parameters. Based on the results of this parametric investigation, a comfort-based optimal design method and the corresponding procedure to be followed were developed. In the proposed method, the weighted average of the required additional tuned mass and TIMS output force are expected to be minimized whilst realizing the expected level of satisfaction in terms of target comfort performance of the floor structure (i.e., target acceleration response ratio). For different design targets, optimized TIMS parameters can be obtained using the proposed design method, and such design cases have been demonstrated by performing time-history analysis under different external human-induced excitations. Results of the said analysis demonstrate that the proposed design method effectively satisfies comfort-performance objectives of a floor with optimal actual mass through use of an inerter system. In addition, the proposed method can be used to maintain a balance between the control cost, additional tuned mass, and structural comfort performance.

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Full-Scale Dynamic Tests of Tuned Viscous Mass Damper With Force Restriction Mechanism and Its Analytical Verification

Cited by 27 publications

References 3 publications

Design of structure with inerter system based on stochastic response mitigation ratio

Design of structure with inerter system based on stochastic response mitigation ratio

Demand-based optimal design of oscillator with parallel-layout viscous inerter damper

Comfort based floor design employing tuned inerter mass system

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