Study on Variable Stiffness Mechanism Using Magnetorheological Elastomer

Polymer Korea ◽  
2021 ◽  
Vol 45 (6) ◽  
pp. 948-954
Author(s):  
Dahoon Ahn ◽  
Yujeong Shin ◽  
Kyungwho Choi
Keyword(s):  
Variable Stiffness ◽  
Magnetorheological Elastomer

PID Control for Magnetorheological Elastomer Absorber with Impact Load

2011 ◽  
Vol 121-126 ◽  
pp. 1734-1738 ◽  
Author(s):  
Jie Fu ◽  
Miao Yu ◽  
Zhi Wei Xing
Keyword(s):  
Numerical Simulation ◽  
Mechanical Property ◽  
Mathematical Model ◽  
Control Strategy ◽  
Pid Control ◽  
Pid Controller ◽  
Impact Load ◽  
Variable Stiffness ◽  
Impact Testing ◽  
Magnetorheological Elastomer

In this paper, a semi-active impact control system, which consists of a new Magnetorehological elastomer (MRE) absorber with variable stiffness, is proposed and its vibration control with impact load is investigated. An impact testing platform is established and mechanical property of fabricated MRE is tested. Based on Newton’s law the appropriate mathematical model of MRE absorber system is established. PID controller for MRE absorber system is designed to reduce the effect of impact load. Finally, the effectiveness of control strategy is verified by numerical simulation.

scholarly journals Design of a Real-Time Adaptively Tuned Dynamic Vibration Absorber with a Variable Stiffness Property Using Magnetorheological Elastomer

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Toshihiko Komatsuzaki ◽  
Yoshio Iwata
Keyword(s):  
Variable Stiffness ◽  
Vibration Absorber ◽  
Property Value ◽  
Magnetorheological Elastomer ◽  
Dynamic Vibration Absorber ◽  
Dynamic Vibration ◽  
Dependent Property ◽  
Dynamic Absorber ◽  
Frequency Tunable ◽  
Tunable Frequency

An elastomer composite with controllable stiffness, known as a magnetorheological elastomer (MRE), is used in a dynamic vibration absorber whose natural frequency is tuned adaptively to the disturbance frequency through the application of an external magnetic field. The field-dependent property test of the fabricated MRE sample shows that the stiffness changes by more than six times compared to the baseline property value at a 40% iron powder volume concentration. The MRE is then used to fabricate a frequency-tunable dynamic absorber for mitigating transient vibrations of a one-degree-of-freedom system. Investigations show that the proposed absorber outperforms a conventional passive-type absorber throughout the tunable frequency range.

Study on the fluctuating wind responses of constructing bridge towers with magnetorheological elastomer variable stiffness tuned mass damper

2021 ◽  
pp. 1045389X2110145
Author(s):  
Qingshan Yang ◽  
Yu Yang ◽  
Qi Wang ◽  
Liuliu Peng
Keyword(s):  
Flexible Structures ◽  
Variable Stiffness ◽  
Dynamic Responses ◽  
Superposition Method ◽  
Control Performance ◽  
Magnetorheological Elastomer ◽  
Main Structure ◽  
High Rise ◽  
Tunable Device ◽  
Fluctuating Wind

Constructing bridge towers are high-rise and flexible structures subjected to significant wind induced vibrations. Tuned Mass Dampers (TMDs) have been widely used to reduce dynamic responses of high-rise structures under fluctuating wind loadings. By resonance with main structure, TMD can effectively suppress structural vibrations. However, the natural frequencies of bridge tower usually decrease continuously during its construction progress. The frequency shift characteristic will cause the detune of TMD, leading to a great control efficiency loss. As a novel stiffness tunable device made of magnetorheological elastomer (MRE), MRE-TMD can adjust its natural frequency in real-time to track the main structure, avoid detuning and achieve better control performance. To study the wind induced vibration control performance of MRE-TMD, this paper explores the fluctuating wind responses of constructing bridge towers in along wind and cross wind directions. The fluctuating wind loads are generated by harmonic superposition method with the along wind fluctuating wind speed spectrum and the empirical power spectrum of fluctuating lift force. By comparing among the uncontrolled, TMD controlled and MRE-TMD controlled constructing bridge towers, the simulation results show that the MRE-TMD system can effectively maintain the tuning state, and significantly reduce the wind induced vibrations during whole construction process.

scholarly journals Homopolymer Based Magnetorheological Elastomer

2021 ◽  
pp. 54-57
Author(s):  
Parth Dhrangdhariya ◽  
Sunil Padhiyar ◽  
Prince Mishra
Keyword(s):  
Magnetic Field ◽  
Mechanical Properties ◽  
Vibration Control ◽  
Applied Magnetic Field ◽  
Variable Stiffness ◽  
Rubber Matrix ◽  
Vibration Absorber ◽  
Vibration Isolator ◽  
Magnetorheological Elastomer ◽  
Spring Force

Magnetorheological rubber belongs to the class of ‘Smart Material’ whose mechanical properties can be altered continuously and reversibly by an applied magnetic field. Magnetorheological rubber (MRE’s) are composites that consists of magnetically polarisable particles mixed into rubber matrix. With suitable controlled algorithms, they respond to change in their environment. Purpose of this work is to know more about magnetorheological rubber for active stiffness, vibration control and dampening applications. Although few applications of these materials have been reported in the literature, the possibilities are numerous. They can be used for various applications such as vibration absorber, vibration isolator, variable stiffness bush, spring, force sensors, actuators etc.

scholarly journals A magnetorheological elastomer rail damper for wideband attenuation of rail noise and vibration

2019 ◽  
Vol 31 (2) ◽  
pp. 220-228 ◽  
Author(s):  
Shuaishuai Sun ◽  
Jian Yang ◽  
Tanju Yildirim ◽  
Donghong Ning ◽  
Xiaojing Zhu ◽  
...  
Keyword(s):  
Decay Rate ◽  
Variable Stiffness ◽  
Magnetorheological Elastomer ◽  
Dynamic Vibration Absorber ◽  
Noise And Vibration ◽  
Practical Applications ◽  
Theoretical Predictions ◽  
Damper Design ◽  
Conventional Rail ◽  
Rail Damper

The noise and vibration effects of rails can have a significant impact on the environment surrounding the railways. Rail dampers are elements that are attached to the sides of the rail and can improve the track decay rate of rail and then enhance the rails’ ability to attenuate noises and vibrations. However, in practical applications, the most efficient rail damper design still cannot adjust its own parameters to adapt to different requirements because their stiffness and damping are fixed after designed. In this work, a tunable magnetorheological elastomer rail damper that works on the principle of a dynamic vibration absorber has been designed, analysed, characterised, and experimentally tested for the suppression of railway noise and vibration. The new rail damper incorporates variable stiffness magnetorheological elastomer layers, whose stiffness can be controlled by an externally applied magnetic field, to realise adaptive characteristics. Experimental characterisations of the magnetorheological elastomer rail damper were performed with an electromagnetic shaker. Subsequently, theoretical predictions of the track decay rate of a UIC-60 rail with different rail dampers and without rail damper were conducted; simulation results verified that magnetorheological elastomer rail dampers can improve the track decay rate of rail over a wider frequency range compared to conventional rail dampers and thus the performance of the magnetorheological elastomer rail damper outperforms other conventional rail dampers on rail noise reduction.

scholarly journals A new magnetorheological elastomer torsional vibration absorber: structural design and performance test

2021 ◽  
Vol 12 (1) ◽  
pp. 321-332
Author(s):  
Pu Gao ◽  
Hui Liu ◽  
Changle Xiang ◽  
Pengfei Yan ◽  
Taha Mahmoud
Keyword(s):  
Magnetic Field ◽  
Torsional Vibration ◽  
Performance Test ◽  
Magnetic Circuit ◽  
Circuit Simulation ◽  
Variable Stiffness ◽  
Vibration Absorber ◽  
Vibration Exciter ◽  
Magnetorheological Elastomer ◽  
The Magnetic Field

Abstract. The semi-active torsional vibration absorber can effectively reduce the torsional vibration of the power-train system. In this paper, a new type of variable stiffness torsional vibration absorber with a magnetorheological elastomer (MRE) as an intelligent controlling element is designed, and the modal analysis, frequency-tracking scheme, and damping effects have been studied. A transient dynamic simulation is utilized to validate the rationality of the mechanical structure, the magnetic field parameters of the absorber are matched, and the magnetic circuit simulation analysis and the magnetic field supply analysis are carried out to verify the closed magnetic circuit. The principle prototype of the innovative vibration absorber is manufactured, the magnetic field strength of the absorber is tested by a Gauss meter, and the results show the efficacy of magnetizing the vibration absorber with a conductive slip ring by solving the magnetizing problem of the rotating parts of the vibration absorber. A special-purpose test rig with a torsional vibration exciter as a power source has been implemented. A comparative experiment has been carried out to test the frequency shift characteristics and authenticate the vibration-reduction effect of the new MRE torsional vibration absorber.

Adaptive Tuned Dynamic Vibration Absorber With Variable Stiffness Property Using Magneto-Rheological Elastomers

2013 ◽  
Author(s):  
Toshihiko Komatsuzaki ◽  
Yoshio Iwata ◽  
Hirofumi Ringe ◽  
Keiji Kawagoshi
Keyword(s):  
Variable Stiffness ◽  
Vibration Absorber ◽  
Frequency Range ◽  
Magnetorheological Elastomer ◽  
Effective Frequency ◽  
Dynamic Vibration Absorber ◽  
Dynamic Vibration ◽  
Narrow Frequency Range ◽  
Dynamic Absorber ◽  
Magneto Rheological

A passive type dynamic vibration absorber offers advantages in reliability and simple constitution, however, the use of the absorber with fixed property is usually limited to harmonically excited case, where the damper is only effective for pre-determined narrow frequency range. Design of the damper following well-known optimal tuning theory could extend the effective frequency range, yet the damping performance remains at a certain amount. In this paper, the stiffness controllable elastomer composite known as Magnetorheological elastomer (MRE) is applied to the dynamic absorber whose natural frequency is tunable by the external magnetic field. MREs are first fabricated and their field-dependent properties are investigated. The MRE is then applied to a dynamic absorber along with stiffness switching scheme so that the vibration of 1-DOF structure is damped more effectively. Investigations show that the vibration of the structure can be fully reduced by the proposed dynamic absorber with variable stiffness functionality.

Tunable Stiffness and Damping Vibration Control Strategy Based on Magnetorheological Elastomer Isolator

2014 ◽  
Vol 543-547 ◽  
pp. 1461-1466 ◽  
Author(s):  
Hui Ming Zheng ◽  
Dong Dong Dong ◽  
Lu Hua Zhu
Keyword(s):  
Control Strategy ◽  
Relative Velocity ◽  
Control Strategies ◽  
Variable Stiffness ◽  
Relative Displacement ◽  
Magnetorheological Elastomer ◽  
Damping Control ◽  
Stiffness Control ◽  
Stiffness And Damping ◽  
Tunable Stiffness

The combined variable stiffness and damping on-off control strategy is investigated using a magnetorheological elastomer (MRE) isolator. A one-degree-of-freedom system has been adopted to assess the efficiency of different control strategies under sinusoidal and random and pulse excitations. The obtained results illustrate that a single tunable stiffness control with maximal damping values under both excitations can simultaneously performs better control of displacement than using minimal damping if the relative displacement and relative velocity of load are in contrary directions . Moreover, on-off variable stiffness control plays a more important role than damping control, therefore it is feasible to only control magnetic field to change MRE elastic and damping property for simplicity.

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