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A novel vibration absorber with variable stiffness controlled by electromagnetic force

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In this paper, a novel method to control the stiffness characteristic of an oscillating system is analytically studied and experimentally assessed. The method principle consists in a controlled modification of tension or compression forces applied along the elastic column beams which support the system sprung mass. The control is achieved without contact by electromagnetic forces applied to the sprung mass, modulated through the supplied voltage. The stiffness variation versus the supplied voltage is obtained by measuring the frequency of the system free vibrations. The model parameters are determined by using inverse methods based on experimental data. The effectiveness of the proposed stiffness control method is illustrated for a smart vibration absorber placed on an oscillating system excited by a chirp input.

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In this paper, a novel method to control the stiffness characteristic of an oscillating system is analytically studied and experimentally assessed. The method principle consists in a controlled modification of tension or compression forces applied along the elastic column beams which support the system sprung mass. The control is achieved without contact by electromagnetic forces applied to the sprung mass, modulated through the supplied voltage. The stiffness variation versus the supplied voltage is obtained by measuring the frequency of the system free vibrations. The model parameters are determined by using inverse methods based on experimental data. The effectiveness of the proposed stiffness control method is illustrated for a smart vibration absorber placed on an oscillating system excited by a chirp input.

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