Broadband vibration control of a structure by using a magnetorheological elastomer-based tuned dynamic absorber

Vibrations are usually undesired phenomena as they may cause discomfort, disturbance, damage, and sometimes destruction of machines and structures. It must be reduced or controlled or eliminated. One of the most common methods of vibration control is the use of the dynamic absorber. The paper is interested in the study of a nonlinear two degrees of freedom (DOF) model. To solve nonlinear equation of motion a high order implicit algorithm is proposed. It is based on the introduction of a homotopy, an implicit scheme of Newmark and the use of techniques of Asymptotic Numerical method (ANM). We propose also a regularization of the contact force to overcome the difficulty of the singularity in this model. A comparison will be presented between the results obtained by the proposed algorithm and those using the classical Newton–Raphson and Newmark time scheme.

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Fabrication and static compression test of hybrid magnetorheological elastomer-fluid for vibration control application

10.1063/5.0024033 ◽

2020 ◽

Author(s):

M. F. Jaafar ◽

N. A. Ahmad ◽

Z. I. Razali ◽

A. F. Mohamad ◽

M. A. I. Zulkiffli

Keyword(s):

Vibration Control ◽

Compression Test ◽

Magnetorheological Elastomer ◽

Static Compression ◽

Control Application

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An Intelligent Artificial Neural Network Modeling of a Magnetorheological Elastomer Isolator

Algorithms ◽

10.3390/a12090195 ◽

2019 ◽

Vol 12 (9) ◽

pp. 195

Author(s):

Shiping Zhao ◽

Yong Ma ◽

Dingxin Leng

Keyword(s):

Neural Network ◽

Artificial Neural Network ◽

Vibration Control ◽

Back Propagation ◽

Structural Vibration ◽

Neural Network Modeling ◽

Back Propagation Algorithm ◽

Magnetorheological Elastomer ◽

Power Cost ◽

Artificial Neural

Recently, magnetorheological elastomer (MRE) has been paid increasingly attention for vibration mitigation devices with the benefits of low power cost, fail safe performances, and fast responses. To make full use of the striking advantages of MRE device, a highly precise model should be developed to predict its dynamic performances. In the work, an MRE isolator in shear–squeeze mixed mode is developed and tested under dynamic loadings. The nonlinear performances in various displacement amplitude and currents are shown. An artificial neural network model with a back-propagation algorithm is proposed to characterize the nonlinear hysteresis of MRE isolator for its implementation in vibration control applications. This model utilized the displacement, velocity, and applied current as inputs and output force as output. The results show that the proposed model has high modeling accuracy and can well portray the complicated behaviors of MRE isolator with different excitations, which shows a fundamental basis for structural vibration control.

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Development of a Multi-DOF Tuned Dynamic Absorber for Reducing Hand Vibrations on an Off-Highway Vehicle

Volume 4: 22nd International Conference on Advanced Vehicle Technologies (AVT) ◽

10.1115/detc2020-22427 ◽

2020 ◽

Author(s):

Hongan Xu ◽

David Clark ◽

Marlin Zeis ◽

Mike Hill ◽

Tony Zambito

Keyword(s):

Vibration Control ◽

Safety Issue ◽

Control Measures ◽

Steering Wheel ◽

Bench Test ◽

Vibration Modes ◽

Quality And Safety ◽

Important Quality ◽

Dynamic Absorber

Abstract A variety of off-highway vehicles are subject to significant steering wheel vibrations during operation. Typical examples of such machines are vibratory asphalt and soil compactors. Large compacting forces, while essential for the proper compacting operation, will inevitably cause undesired effects such as severe vibrations of steering wheels. Traditional vibration control measures are often found either impractical or less effective in reducing the level of hand vibrations which is considered an important quality and safety issue in compacter design and sales. In this paper, an advanced concept of reducing hand vibrations is presented in the context of Multi-degree-of-freedom Tuned Dynamic Absorbers (MTDA). The MTDA essentially represents an assembly of simple dynamic absorbers individually tuned to different targeted vibration modes in different degree of freedoms. While the design concept and associated parameters are numerically determined by FEA, the prototype is fine tuned to the desired vibration modes through a bench test. The effectiveness of the MTDA is experimentally verified in-situ through a sequence of tests which are carefully designed to adequately reflect its performance under field conditions.

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