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Smart Structures and Systems
  Volume 23, Number 6, June 2019 , pages 589-613

Experimental evaluation of an inertial mass damper and its analytical model for cable vibration mitigation
Lei Lu, Gaston A. Fermandois, Xilin Lu, Billie F. Spencer, Jr., Yuan-Feng Duan and Ying Zhou

    Cables are prone to vibration due to their low inherent damping characteristics. Recently, negative stiffness dampers have gained attentions, because of their promising energy dissipation ability. The viscous inertial mass damper (termed as VIMD hereinafter) can be viewed as one realization of the inerter. It is formed by paralleling an inertial mass part with a common energy dissipation element (e.g., viscous element) and able to provide pseudo-negative stiffness properties to flexible systems such as cables. A previous study examined the potential of IMD to enhance the damping of stay cables. Because there are already models for common energy dissipation elements, the key to establish a general model for IMD is to propose an analytical model of the rotary mass component. In this paper, the characteristics of the rotary mass and the proposed analytical model have been evaluated by the numerical and experimental tests. First, a series of harmonic tests are conducted to show the performance and properties of the IMD only having the rotary mass. Then, the mechanism of nonlinearities is analyzed, and an analytical model is introduced and validated by comparing with the experimental data. Finally, a real-time hybrid simulation test is conducted with a physical IMD specimen and cable numerical substructure under distributed sinusoidal excitation. The results show that the chosen model of the rotary mass part can provide better estimation on the damper
Key Words
    stay cable; inerter; inertial mass damper; performance test; nonlinearities; real-time hybrid simulation test
Lei Lu, Xilin Lu and Ying Zhou: State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai, 200092, ChinaDepartment of Civil & Environmental Engineering, University of Illinois at Urbana-Champaign, IL, 61801, USA
Gaston A. Fermandois and Billie F. Spencer, Jr.: Department of Civil & Environmental Engineering, University of Illinois at Urbana-Champaign, IL, 61801, USA
Yuan-Feng Duan: College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China

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