Development of a tuning algorithm for a dynamic vibration absorber with a variable stiffness property

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.

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Research on the performance of damping boring bar with a variable stiffness dynamic vibration absorber

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-016-9612-2 ◽

2016 ◽

Vol 89 (9-12) ◽

pp. 2893-2906 ◽

Cited By ~ 10

Author(s):

Xianli Liu ◽

Qiang Liu ◽

Shi Wu ◽

Lijia Liu ◽

Haining Gao

Keyword(s):

Variable Stiffness ◽

Vibration Absorber ◽

Dynamic Vibration Absorber ◽

Boring Bar ◽

Dynamic Vibration

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

Volume 1: Development and Characterization of Multifunctional Materials; Modeling, Simulation and Control of Adaptive Systems; Integrated System Design and Implementation ◽

10.1115/smasis2013-3106 ◽

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.

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

Shock and Vibration ◽

10.1155/2019/5284194 ◽

2019 ◽

Vol 2019 ◽

pp. 1-13 ◽

Cited By ~ 3

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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