Modal Response Characteristics of a Multiple-Degree-Of-Freedom Structure Incorporated with Tuned Viscous Mass Dampers

Ikago, Kohju; Sugimura, Yoshifumi; Saito, Kenji; Inoue, Norio

doi:10.3130/jaabe.11.375

Cited by 81 publications

(57 citation statements)

References 4 publications

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“…Kida et al conducted a full‐scale dynamic test of a TVMD to further confirm the validity of the theory and the analysis method employed. Design methods for single‐degree‐of‐freedom (SDOF) and multiple‐degree‐of‐freedom TVMD seismic control systems were proposed by Ikago et al, and comparison studies and shake table tests of a small‐scale TVMD were also conducted to verify its effectiveness. However, a concern with the TVMD system is the excessive response of the damper's force due to the resonance of the secondary system.…”

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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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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“…In this system, the inertance and the viscous damper are connected in parallel and the spring is arranged in series with them. The device is connected to the structure through the spring; thus, the stiffness of the spring is tuned so that the rotational inertial mass resonates with the structure, which leads to improvements of the energy absorption efficiency and vibration mitigation performance …”

Section: Introductionmentioning

confidence: 99%

Structural control with tuned inertial mass electromagnetic transducers

Asai

Araki

Ikago

2017

Struct Control Health Monit

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Summary This paper investigates the validity of the tuned inertial mass electromagnetic transducer (TIMET) applied to building structures subjected to seismic motions. The TIMET is a device inspired by two innovative structural control devices proposed recently, that is, tuned viscous mass damper and electromagnetic transducer. The TIMET consists of a spring, an inertial mass produced by a ball screw mechanism, and an electromagnetic transducer part composed of a motor and an electrical circuit. The stiffness of the spring is tuned such that the inertial mass resonates with the vibrating building. This makes the motor installed in parallel with the inertial mass run up in an efficient way, and the vibration energy is converted to electrical energy effectively. As a result, vibration of the building decays fast and electrical energy is stored. This generated energy that is reusable for the self‐powered control systems, structural health monitoring, emergency power source, and so on. In this paper, through numerical simulation studies employing the scaled three‐story building model proposed for benchmark studies, the vibration reduction and energy harvesting capabilities of the TIMET is explored and the application potentiality to civil structures is discussed.

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“…Recently, a TVMD-like device was applied to a steel structure in Japan [26]. Additionally, one can find studies about multiple-degree-of-freedom system with TVMD [27].…”

Section: Introductionmentioning

confidence: 99%

Effects of play and inerter nonlinearities on the performance of tuned mass damper

Brzeski

Perlikowski

2016

Nonlinear Dyn

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In this paper, we analyze the dynamics of tuned mass dampers with inerters. In the beginning, we describe the influence of inertance value with respect to the overall mass of the damping device. For further analysis, we pick three practically significant caseseach corresponding to different composition of tuned mass damper inertia. Then, we focus on the effects caused by different types of inerters' nonlinearities. Viscous damping, dry friction and play in the inerter gears influence the dynamics of the tuned mass damper and affect its damping efficiency. Finally, we examine the dynamics of the model that incorporates all of these factors and propose its simplification which is genuine but more convenient. Our results show how to adjust the inerter type and the parameters depending on our needs and intended application. The knowledge on how to model the behavior of tuned mass dampers with inerters will be of practical use to engineers working with mechanical dampers.

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Modal Response Characteristics of a Multiple-Degree-Of-Freedom Structure Incorporated with Tuned Viscous Mass Dampers

Cited by 81 publications

References 4 publications

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

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

Structural control with tuned inertial mass electromagnetic transducers

Effects of play and inerter nonlinearities on the performance of tuned mass damper

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