VIBRATION SUPPRESSION EFFECT OF LIQUID-CRYSTAL UNDER ELECTROMAGNETIC-FIELD

This paper describes an experimental study on the vibration suppressio n of a laminated beam with a nematic liquid crystal under electric and magnetic fields. Firstly, a laminated beam is constructed with two th in nematic liquid crystal layers and a thin aluminum beam inside. The results under electric field show that the resonance point of the beam shifts higher, and the response displacement amplitude decreases as e lectric field strength increases. This is because the apparent viscosi ty of a liquid crystal and the stiffness of the beam change when elect ric field is applied. Considering these results, this laminated beam i s modeled as a spring-mass-damper model and a simulation is performed based on this model. The experimental and simulation results almost ag reed. Then the effect of magnetic field is investigated experimentally . The damping effect appears in high magnetic field, but this effect m ight be caused by magnetic damping effect due to induced current and n ot by the damping effect of the liquid crystal.