Ms. Anne-Marie Albanese Lerner Profile

Anne-Marie Albanese Lerner

at Georgia Institute of Technology

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Proceedings Article | 26 July 2004 Paper

Smart fabric adaptive stiffness for active vibration absorbers

Anne-Marie Albanese, Kenneth Cunefare

Proceedings Volume 5383, (2004) https://doi.org/10.1117/12.539885

KEYWORDS: Magnetism, Iron, Particles, Control systems, Amplifiers, Vibration control, Statistical analysis, Composites, Carbon, Ferromagnetics

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Unconstrained magnetorheological-elastomers (MRE) experience a stiffness increase and elastomeric deformation in response to an applied magnetic field. An MRE consists of ferromagnetic particles dispersed in a host elastomer matrix. This study considers whether the stiffness change of MRE springs is due to magnetic particle-to-particle interactions or to elastomer deformation. If the stiffening is attributable to magnetic particle interaction, then it should occur even in the absence of the elastomer. To test this hypothesis, a smart fabric consisting of low-carbon steel thread in one direction and nonmagnetic thread in the other was created. Two extension springs were placed in parallel with this smart fabric, and placed in between two iron masses. An electromagnet coil wound about one of the masses provided the source of magnetic field across the smart fabric. The frequency response of the device was measured when the coil was driven by a DC current, at 0.5 Amp increments, from 0 to 4. The device exhibited a 33% increase in stiffness at 4 Amps compared to the stiffness at 0 Amps. While this shift is not as large as shifts observed in MREs, the design was not optimized for iron content, and only had a 0.6% iron content.

Proceedings Article | 31 July 2003 Paper

Properties of a magnetorheological semi-active vibration absorber

Anne-Marie Albanese, Kenneth Cunefare

Proceedings Volume 5052, (2003) https://doi.org/10.1117/12.483946

KEYWORDS: Switching, Magnetism, Silicon, Smart materials, Switches, Iron

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A tuned vibration absorber (TVA) is a spring-damper-mass system used in many industries for the suppression of a specific vibration frequency. A state-switched absorber (SSA) is similar to a TVA, except that one or more components in the SSA is able to instantaneously and discretely change properties, thus increasing the effective bandwidth of vibration suppression. The components responsible for bandwidth increase are called switching elements. In order to design a replacement SSA for the classic TVA, the SSA must operate in the appropriate frequency range, be lightweight and compact. An optimal SSA will also have a maximal frequency range that it can switch between. This paper discusses the development of a magnetorheological (MR) silicone gel used as the SSA switching element, the SSA geometry selected to maintain a magnetic flux path, and the contribution of the magnet-mass to frequency shifting. The MR gel is iron-doped silicone, cured in the presence of a magnetic field. During operation, the applied magnetic flux is modified to change the natural frequency. Since a flux path through the switching element is required, a steel flux path was incorporated as part of the SSA design. The SSA is desgined to operate below 100 Hz. An MR elastometer with 35% iron by volume yielded the most tunable results, where the minimum natural frequency was found to be 45 Hz, and the natural frequency was tunable up to 183 Hz.

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