Non-Linear Correction of Vibration Protection System Containing Tuned Dynamic Absorber

Veprik, Alexander; Babitsky, Vladimir

doi:10.1006/jsvi.2000.3205

Cited by 9 publications

(5 citation statements)

References 5 publications

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“…There are two parts that need to be analyzed: the magnet coils and iron core. When the alternating magnetic field is applied, the inductance of the magnet coils causes the induced current which also generates an opposite magnetic field according to Lenz's law given by equation (7). That weakens the magnitude of the field.…”

Section: Influence Of Current On Magnetic Fieldmentioning

confidence: 99%

“…Under normal circumstances, mechanical vibration exerted baneful influence upon human health, reduced the precision of the instrument, and damaged building structures, for which it should be suppressed. There are two common methods: passive and adaptive-tuned approaches [7,8]. Passive approaches, which are only effective for a primary system with a certain bandwidth of natural frequency, are simple to implement.…”

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confidence: 99%

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An investigation of the dynamic behaviors of an MRE isolator subjected to constant and alternating currents

Shi

Zhu

et al. 2016

Smart Mater. Struct.

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This paper presents the dynamic behaviors of a magneto-rheological elastomer (MRE) isolator by applying constant and time-varying exciting currents. As the first step, a shear type of the MRE isolator is devised with a simplified design. Then, the distributions of the magnetic field in the MRE isolator under both constant and alternating exciting currents are analyzed by commercial software (ANSYS). Subsequently, the dynamic performances of the isolator are experimentally evaluated by applying three different inputs: constant, square and sinusoidal exciting current. It has been identified from the experimental results that the constant exciting current can provide optimal performances in static control, while the MRE isolator presents more advantages in dynamic control with the sine wave current excitation. This means that an attenuation coefficient of alternating current should be considered to achieve a better dynamic control effect. On the other hand, it has also been demonstrated that alternating the magnetic field can provide a broader variable range of the viscous damping coefficient than that under constant magnetic field.

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Section: Influence Of Current On Magnetic Fieldmentioning

confidence: 99%

mentioning

confidence: 99%

An investigation of the dynamic behaviors of an MRE isolator subjected to constant and alternating currents

Shi

Zhu

et al. 2016

Smart Mater. Struct.

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“…Figure 1 shows the physical structure of the shock isolator, which consists of an elastic impact head (1), a cylinder (4) inside which a piston ( 3) is connected to a piston rod (2) to move axially, a hollow damping piston (5), a metal mounting bracket (6), and an accumulator with an air chamber (7). The throttling orifice is formed as a gap between the inner surface of the piston (3) and the outer surface of the damping piston (5).…”

Section: Design Considerationmentioning

confidence: 99%

“…It was found that the inclusion of a Coulomb damper improves the performance at high-severity parameters. Veprik and Babitsky [6] utilized the theory of momentary impact and technique of periodic Green functions to study the dynamics of the non-linear vibration protection system under harmonic excitation with variable frequency. Park and Luu [7] analysed an anti-vibration systems using negative stiffness systems based on mathematics and experiment, and they made a modification from the former system to construct a low-frequency and small-size anti-vibration table that is believed to be a highly competitive product in the market.…”

Section: Introductionmentioning

confidence: 99%

A novel shock isolator for heavy structure installation

Zhang

Zhu

Shi

et al. 2010

Proceedings of the Institution of Mechanical Engineers, Part C:

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During the heavy structure installation process, any external disturbance may result in a huge impact on the substructure due to the extremely large mass involved, which may damage the whole structure permanently. Therefore, a reliable shock isolator for the installation interface is very important in such applications. In this study, a novel shock isolator based on a hydraulic damper is presented. It has been designed with an optimized throttling orifice to dissipate the energy efficiently and with air bags to store energy. Considering the maximal relative travel range of the isolator within a specified physical limit, the design is formulated as an optimization problem to minimize the peak acceleration during the impact and finalized as a constant force isolator. A mathematical model of the isolator is established and a prediction of its performance is obtained through some simulations. Experiments are performed to evaluate the theoretical model and it is found that the experimental data agree with the theoretical prediction very well, and thus validates the design. The influence of initial oil pressure and the material of elastic impact head are also investigated. The results show that higher initial oil pressure increases the peak acceleration, while the material of the elastic impact head has no significant effect on that.

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“…Sophisticated portable infrared (IR) imagers have become an integral part of surveillance, reconnaissance, targeting, and navigation in both the military and private sector over the past few decades. The performance of these imagers relies on the IR imagers being kept at cryogenic temperatures, which are typically achieved using a closed Stirling cycle cryogenic engine (Veprik and Babitsky, 2000). Recently, the traditional rotary style Striling engines have been replaced with linear types, which show a clear benefit from the system design standpoint, but present more problems with the mechanical vibrations of the system.…”

Section: Introductionmentioning

confidence: 99%

Design and test of an adaptive vibration absorber based on magnetorheological elastomers and a hybrid electromagnet

Sinko

Karnes

Koo

et al. 2012

Journal of Intelligent Material Systems and Structures

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The focuses of this study are to design an adaptive-tuned vibration absorber based on a smart materials known as magnetorheological elastomers and to test its dynamic performance. A primary system replicating a miniature cryogenic cooler (i.e. mass and shape) was designed and fabricated in order to test the effectiveness of the vibration absorber. A hybrid magnetic system (electromagnet and permanent magnets) was also designed and fabricated in order to actuate the magnetorheological elastomers as an adaptive stiffness element in the vibration absorber. The vibration testing was conducted on both the primary system and vibration absorber individually in order to characterize the behavior and verify the design constraints. Further testing was performed on a 2-degrees-of-freedom system to measure and assess the feasibility of the magnetorheological elastomer material for use in an application requiring an adaptive vibration absorber. The results show that by using a hybrid design for the electromagnet within the vibration absorber, the stiffness of the magnetorheological elastomer material can be increased and decreased above its nominal value, therefore demonstrating the feasibility of this design as an alternative adaptive vibration absorber.

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Non-Linear Correction of Vibration Protection System Containing Tuned Dynamic Absorber

Cited by 9 publications

References 5 publications

An investigation of the dynamic behaviors of an MRE isolator subjected to constant and alternating currents

An investigation of the dynamic behaviors of an MRE isolator subjected to constant and alternating currents

A novel shock isolator for heavy structure installation

Design and test of an adaptive vibration absorber based on magnetorheological elastomers and a hybrid electromagnet

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