Experimental Testing and Numerical Simulation of a Six-Story Structure Incorporating Two-Degree-of-Freedom Nonlinear Energy Sink

Wierschem, Nicholas E.; Luo, Juan; AL-Shudeifat, Mohammad A.; Hubbard, Sean A.; Ott, Richard J.; Fahnestock, Larry A.; Quinn, D. Dane; McFarland, D. Michael; Spencer, Billie F.; Vakakis, Alexander F.; Bergman, Lawrence A.

doi:10.1061/(asce)st.1943-541x.0000978

Cited by 71 publications

(30 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To evaluate the ability of the model to predict the responses of the system, the simulated time series and effective damping measures are compared with the corresponding experimental results. Different from Section 3, the simulations in this section use the base motions measured from the experiments and the spring stiffness model shown in Equation (17). Additionally, instead of the optimal damping shown in Equation (16b), an estimation of the damping coefficient, 135 Ns/m, is assigned to each NES in the simulation.…”

Section: Experimental Results Of Impulsive Testing and Comparison Witmentioning

confidence: 99%

Design, simulation, and large‐scale testing of an innovative vibration mitigation device employing essentially nonlinear elastomeric springs

Luo

Wierschem

Fahnestock

et al. 2014

Earthq Engng Struct Dyn

Self Cite

View full text Add to dashboard Cite

SUMMARYThis study proposes an innovative passive vibration mitigation device employing essentially nonlinear elastomeric springs as its most critical component. Essential nonlinearity denotes the absence (or near absence) of a linear component in the stiffness characteristics of these elastomeric springs. These devices were implemented and tested on a large‐scale nine‐story model building structure. The main focus of these devices is to mitigate structural response under impulse‐like and seismic loading when the structure remains elastic. During the design process of the device, numerical simulations, optimizations, and parametric studies of the structure‐device system were performed to obtain stiffness parameters for the devices so that they can maximize the apparent damping of the fundamental mode of the structure. Pyramidal elastomeric springs were employed to physically realize the optimized essentially nonlinear spring components. Component‐level finite element analyses and experiments were conducted to design the nonlinear springs. Finally, shake table tests using impulse‐like and seismic excitation with different loading levels were performed to experimentally evaluate the performance of the device. Experimental results demonstrate that the properly designed devices can mitigate structural vibration responses, including floor acceleration, displacement, and column strain in an effective, rapid, and robust fashion. Comparison between numerical and experimental results verified the computational model of the nonlinear system and provided a comprehensive verification for the proposed device. Copyright © 2014 John Wiley & Sons, Ltd.

show abstract

Section: Experimental Results Of Impulsive Testing and Comparison Witmentioning

confidence: 99%

Design, simulation, and large‐scale testing of an innovative vibration mitigation device employing essentially nonlinear elastomeric springs

Luo

Wierschem

Fahnestock

et al. 2014

Earthq Engng Struct Dyn

Self Cite

View full text Add to dashboard Cite

show abstract

“…They showed that due to the chaotic behavior of the rotator, it can dissipate the inputted shock energy effectively. In recent years, there are some researches on different types of the NES such as two degrees of freedom NES, elastomeric bumpers attached to different structures and bistable attachments [23][24][25][26]. Al-Shudeifat et al [27], used an asymmetric vibroimpact (VI) NES in order to dissipate a shock excitation imposed on a two degrees of freedom primary system.…”

Section: Introductionmentioning

confidence: 99%

Vibration control of a nonlinear beam with a nonlinear energy sink

et al. 2015

View full text Add to dashboard Cite

In this paper, targeted energy transfer from a nonlinear continuous system to a nonlinear energy sink (NES) is investigated. For this purpose, the equation of a nonlinear beam with simply supported ends, on which the NES is attached, is derived using RayleighRitz method and the Lagrange equation. Then, parameters of the NES are optimized by both sensitivity analysis and particle swarm optimization (PSO) method. Analysis of the energy transfer between the nonlinear beam and the NES is presented, using the complexification-averaging method, too. Attaching an NES to a nonlinear continuous system and using the PSO method to obtain the optimized parameters of the NES is a new development, presented in this work. Also, here, more than one mode of the beam has been considered for analysis of energy transfer between the NES and different modes of the primary system.

show abstract

“…In the context of innovative control technologies, the tuned mass damper (TMD) has been mostly developed and applied with alternative strategies (Amini et al., ; Gutierrez Soto and Adeli, ). The novel damping mechanism has been actively adopted to further improve the performance of conventional TMDs, especially under earthquake excitations (Wierschem et al., ; Xiang and Nishitani, ). Recently, the concept of eddy‐current (EC) damping was illustrated for the vibration suppression of beam‐type structures (Sodano et al., ; Bourquin et al., ); it was theoretically studied as a magnetoelastic oscillator (Kumar et al., ); and it was feasibly illustrated for TMD applications (Wang et al., ).…”

Section: Introductionmentioning

confidence: 99%

Data‐Driven Two‐Level Performance Evaluation of Eddy‐Current Tuned Mass Damper for Building Structures Using Shaking Table and Field Testing

Lü

Zhang

et al. 2018

Computer aided Civil Eng

View full text Add to dashboard Cite

A computational framework with a two‐level performance evaluation is proposed for the tuned mass damper (TMD)‐structure system and is implemented for a new eddy‐current (EC) TMD in a data‐driven manner by incorporating the measurements from a shaking table test and real‐world field tests. The first level of evaluation corresponds to the data analysis with classical performance indices, whereas the second level focuses on the energy dissipation and exchange behavior in the time domain. Accordingly, two key steps of physical modeling and unmeasured response estimation are sequentially presented, and the steps adopt two types of energy balance formulations and state–space descriptions for the primary structure and the TMD, respectively. In the case of shaking table test, the momentary and cumulative behavior of energy dissipation and exchange at the second level is systematically revealed, and several key issues are identified for explaining the observed performance variation and excitation‐sensitivity. In the case of field test, the damping and control performance of the EC‐TMD at the real‐world scale is investigated with informative results using the first level evaluation.

show abstract

Experimental Testing and Numerical Simulation of a Six-Story Structure Incorporating Two-Degree-of-Freedom Nonlinear Energy Sink

Cited by 71 publications

References 19 publications

Design, simulation, and large‐scale testing of an innovative vibration mitigation device employing essentially nonlinear elastomeric springs

Design, simulation, and large‐scale testing of an innovative vibration mitigation device employing essentially nonlinear elastomeric springs

Vibration control of a nonlinear beam with a nonlinear energy sink

Data‐Driven Two‐Level Performance Evaluation of Eddy‐Current Tuned Mass Damper for Building Structures Using Shaking Table and Field Testing

Contact Info

Product

Resources

About