631 Development of a dynamic vibration absorber with variable stiffness property using Magneto-rheological Elastomer

2012 ◽  
Vol 2012 (0) ◽  
pp. _631-1_-_631-10_
Author(s):  
Hirofumi RINGE ◽  
Toshihiko KOMATSUZAKI ◽  
Yoshio IWATA
Keyword(s):  
Variable Stiffness ◽  
Vibration Absorber ◽  
Dynamic Vibration Absorber ◽  
Dynamic Vibration ◽  
Stiffness Property ◽  
Magneto Rheological

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.

scholarly journals Application of Adaptive Tuned Magneto-Rheological Elastomer for Vibration Reduction of a Plate by a Variable-Unbalance Excitation

2020 ◽  
Vol 10 (11) ◽  
pp. 3934 ◽  
Author(s):  
Un-Chang Jeong
Keyword(s):  
Vibration Reduction ◽  
Excitation Frequency ◽  
Target Object ◽  
Vibration Absorber ◽  
Magnetorheological Elastomer ◽  
Dynamic Vibration Absorber ◽  
Mass Part ◽  
Dynamic Vibration ◽  
Frequency Excitation ◽  
Magneto Rheological

The present study on vibration reduction in systems wherein the excitation frequency is variable designed and fabricated a magnetorheological elastomer (MRE)-based tunable dynamic vibration absorber and evaluated its performance in an experimental manner. The design of an MRE-based adaptive tuned dynamic vibration absorber (ATDVA) involves designing two parts: stiffness and mass. Before designing the MRE-based ATDVA, this study determined the resonance frequency of a target object for vibration reduction. For the design of the ATDVA’s stiffness part, the thickness of specimens was determined by measuring the rate of variation of the MRE’s shear modulus with respect to the MRE’s thickness. The design of the mass part was optimized using sensitivity analysis and genetic algorithms after the derivation of formulas for its magnetic field and mass. Further, upon the application of an electric current to the MRE, its stiffness was measured so that the stiffness of the designed MRE-based ATDVA could be tuned accordingly. Finally, the vibration-reducing performance of the MRE-based ATDVA was evaluated to determine the applicability of the vibration absorber under the condition of variable-frequency excitation.

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.

scholarly journals Analysis of the Vibration Characteristics of a Boring Bar with a Variable Stiffness Dynamic Vibration Absorber

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Lie Li ◽  
Beibei Sun ◽  
Haitao Hua
Keyword(s):  
Axial Compression ◽  
Vibration Suppression ◽  
Variable Stiffness ◽  
Vibration Absorber ◽  
Dynamic Vibration Absorber ◽  
Boring Bar ◽  
Dynamic Vibration ◽  
Excitation Frequencies ◽  
Optimal Stiffness ◽  
The Relationship

Boring bars are widely used in deep hole machining. Due to the low stiffness of the long cantilever boring bar, vibration often occurs in the boring process. Vibration suppression can permit higher productivity and a better surface finish. To improve the performance of boring operations, a variable stiffness dynamic vibration absorber (DVA) is added inside the boring bar to reduce the vibration. The stiffness of the DVA is provided by two rubber bushes placed inside the DVA. By changing the axial compression, the stiffness of the DVA can be adjusted to accommodate different excitation frequencies. By establishing the relationship between the stiffness of the DVA and the axial compression of the rubber bush, the optimal stiffness for different excitation frequencies can always be found. A boring experiment is conducted, and the results show that, by selecting a reasonable axial compression, the vibration of the boring bar can be effectively suppressed.

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