scholarly journals Magnetic Nonlinear Energy Sink for Vibration Attenuation of Unbalanced Rotor System

2017 ◽  
Vol 2017 ◽  
pp. 1-15 ◽  
Author(s):  
Hongliang Yao ◽  
Dasheng Zheng ◽  
Bangchun Wen
Keyword(s):  
Averaging Method ◽  
Nonlinear Energy Sink ◽  
Rotor System ◽  
Frequency Range ◽  
Runge Kutta Method ◽  
Unbalanced Rotor ◽  
Vibration Attenuation ◽  
Energy Sink ◽  
Vibration Attenuation Performance ◽  
Nonlinear Energy

A novel nonlinear energy sink (NES) consisting of permanent magnetic springs and coil springs is proposed, and the vibration attenuation performance of the NES for unbalanced rotor system is investigated. Firstly, the nonlinearity of the magnet spring is analyzed and the structure of the NES is introduced. Then, the dynamic model of the rotor system with the NES is built, and the responses and stabilities of the system are studied by applying Complexification-averaging method. The strongly modulated responses (SMR) behavior, which is the most important performance characteristic of the NES, is analytically studied by combining Complexification-averaging method and multiscale method and numerically verified by Runge-Kutta method. The results show that the NES is effective in attenuating the vibration of unbalanced rotor, and the SMR occurrence range can be broadened by increasing the nonlinearity of the NES. And also, the NES has better performance over a wider frequency range than the linear absorber.

scholarly journals Dynamics of Nonlinear Primary Oscillator with Nonlinear Energy Sink under Harmonic Excitation: Effects of Nonlinear Stiffness

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Min Sun ◽  
Jianen Chen
Keyword(s):  
Averaging Method ◽  
Nonlinear Energy Sink ◽  
Excitation Amplitude ◽  
Harmonic Excitation ◽  
Nonlinear Stiffness ◽  
Frequency Range ◽  
Steady State Responses ◽  
Energy Sink ◽  
State Responses ◽  
Nonlinear Energy

The dynamics of a system consisting of a nonlinear primary oscillator, subjected to a harmonic external force, and a nonlinear energy sink (NES) are investigated. The analytical solutions for the steady-state responses are obtained by the complexification-averaging method and the analytical model is confirmed by numerical simulations. The results indicate that the introduction of the NES can effectively suppress the vibrations of the primary oscillator. However, as the excitation amplitude increased, the NES may lose its efficiency within certain frequency range due to the appearance of the high response branches. Following the results analysis, it is concluded that this failure can be eliminated by reducing the nonlinear stiffness of the NES properly. The effects of nonlinear stiffness of the primary oscillator on the corresponding responses are also studied. The increase in this nonlinear stiffness can reduce the response amplitude and alter the frequency band where the high branches exist.

scholarly journals Multi-stable nonlinear energy sink for rotor system

2020 ◽  
Vol 118 ◽  
pp. 103273 ◽  
Author(s):  
Hongliang Yao ◽  
Yuwei Wang ◽  
Yanbo Cao ◽  
Bangchun Wen
Keyword(s):  
Nonlinear Energy Sink ◽  
Rotor System ◽  
Energy Sink ◽  
Nonlinear Energy

Bi-stable buckled beam nonlinear energy sink applied to rotor system

2020 ◽  
Vol 138 ◽  
pp. 106546 ◽  
Author(s):  
Hongliang Yao ◽  
Yuwei Wang ◽  
Linqing Xie ◽  
Bangchun Wen
Keyword(s):  
Nonlinear Energy Sink ◽  
Rotor System ◽  
Buckled Beam ◽  
Energy Sink ◽  
Nonlinear Energy

scholarly journals Application of Nonlinear Energy Sink for Rotor System Vibration Suppression

2020 ◽  
Vol 56 (15) ◽  
pp. 191
Author(s):  
YAO Hongliang ◽  
CAO Yanbo ◽  
ZHANG Qin ◽  
WEN Bangchun
Keyword(s):  
Vibration Suppression ◽  
Nonlinear Energy Sink ◽  
Rotor System ◽  
System Vibration ◽  
Energy Sink ◽  
Nonlinear Energy

scholarly journals On the Effect of Nonlinear Energy Sink Damping in Seismic Vibration Attenuation

2021 ◽  
Author(s):  
Eliot Motato ◽  
Fabio G. Guerrero
Keyword(s):  
Nonlinear Energy Sink ◽  
Tuned Mass Dampers ◽  
Building Model ◽  
Wide Range ◽  
Vibration Attenuation ◽  
Different Types ◽  
Energy Sink ◽  
Shear Building ◽  
Model Subject ◽  
Nonlinear Energy

Abstract Nonlinear Energy Sinks (NESs) have been proposed for passively reducing the amplitude of vibrations in different types of structures. The main advantage of NES over traditional Tuned Mass Dampers (TMDs) lies in its capability to redistribute the vibrating energy inside a primary structure, what effectively reduces the amplitude of the structure oscillations over a wide range of frequencies. However, the performance of an NES can be substantially affected even by small variations on input energy as in the case of buildings under seismic ground excitation. In this work it is shown that the NES energy sensibility can be significantly reduced by properly selecting the NES damping coefficient. A three stories shear building model subject to seismic ground excitation is used to numerically study the effect that NES damping has on its vibration reduction performance.

Improving the dynamic behavior of the plate under supersonic air flow by using nonlinear energy sink

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Hassan Asadigorji ◽  
Ardeshir Karami Mohammadi
Keyword(s):  
Dynamic Behavior ◽  
Plate Theory ◽  
Time History ◽  
Nonlinear Energy Sink ◽  
Phase Portraits ◽  
Governing Equations ◽  
Runge Kutta Method ◽  
Energy Sink ◽  
Square Plate ◽  
Nonlinear Energy

Abstract In this paper, a nonlinear energy sink is used to improve the dynamic behavior of a square plate in supersonic flow. The plate is examined with different boundary conditions. The effect of changing the parameters and installation location of nonlinear energy sink on improving the dynamic behavior of the plate has been studied. The governing equations are first obtained using Von Kármán’s plate theory and piston theory, and then discretized using the Rayleigh–Ritz process. These equations are then solved using the fourth-order Runge–Kutta method. Time history curves, phase portraits, Poincaré maps, and bifurcation diagrams were used to investigate the dynamic behavior and impact of nonlinear energy sink. The results show that the dynamic behavior of the plate is very complex in some cases, but with proper use of nonlinear energy sinks, this behavior can be improved.

An experimentally validated piezoelectric nonlinear energy sink for wideband vibration attenuation

2018 ◽  
Vol 437 ◽  
pp. 68-78 ◽  
Author(s):  
Tarcisio M.P. Silva ◽  
Marcel A. Clementino ◽  
Carlos De Marqui ◽  
Alper Erturk
Keyword(s):  
Nonlinear Energy Sink ◽  
Vibration Attenuation ◽  
Energy Sink ◽  
Nonlinear Energy

Response Regimes of Linear Oscillator Coupled to Nonlinear Energy Sink Under Periodic Forcing: Account of Detuning

2007 ◽  
Author(s):  
Y. Starosvetsky ◽  
O. V. Gendelman
Keyword(s):  
Averaging Method ◽  
Nonlinear Energy Sink ◽  
Linear Oscillator ◽  
External Forcing ◽  
Frequency Detuning ◽  
Main Resonance ◽  
Periodic Forcing ◽  
Local Bifurcations ◽  
Energy Sink ◽  
Nonlinear Energy

Dynamical system under investigation in the current work is comprised of harmonically forced linear oscillator with attached nonlinear energy sink. External forcing frequency detuning near the main resonance (1:1) is included in the system investigation. The detailed study of the periodic and quasi-periodic regimes is done in the work via (adaptive) averaging method. Local bifurcations of the periodic regimes are revealed and fully described in the space of system parameters (amplitude of excitation, damping, frequency detuning). Various possibilities of coexistence of the response regimes are predicted analytically and demonstrated numerically. Among those is a coexistence of two distinct periodic regimes together with strongly modulated response (SMR). All findings of the simplified analytic model are verified numerically and considerable agreement is observed.

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