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Mechanical Dynamics Laboratory

School of Science and Technology
Dept. Mechanical Engineering Informatics
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[*] Fluid inertia damper using MR fluid with a long spiral bypass pipe
An inertia damper with a long spiral bypass pipe was developed in order to obtain a series inertia effects for vibration suppression of structures in practical use. A prototype damper was manufactured, and resisting force characteristics were measured. Seismic response tests using a 3-story structure were performed using a shaking table.
[*] Vibration reduction of traffic signal pole by dynamic absorber that generates electrical power
The authors propose a damper that generates electrical power in order to not only suppress vibration and also get electrical energy when traffic signal poles are oscillated by turbulence. Vibration modes are analyzed by using FEM, and 1/3 scale model is built up. Harmonic vibration tests are carried out, and effect of vibration suppression is confirmed.
[*] Study on small seismic isolation table using coil springs
A new type of small seismic isolation table using coil springs, which has a simple construction and the capability of vibration isolation in every horizontal direction, is proposed. Seismic response tests are carried out by using a shaking table in order to confirm the effect of vibration isolating under some earthquakes.
[*] Fluid damper that applies electric and magnetic fields to a conductive fluid and ferrite particles
The authors propose a unique type of a liquid inertia damper that utilizes electromagnetic induction effect of conductive liquid and magnetized ferrite particles. Electromagnetic induction force is derived by Fleming's left hand rule. Ferrite particles can act as a virtual orifice, resisting force will be controlled.
[*] Vibration control of beams by moment-type dynamic absorber
The authors propose a new type of dynamic absorber utilizing the bending moment that it exerts on a beam. The frequency responses of a cantilever and simply supported beams to which a moment-type dynamic absorber is attached, and tuning conditions of the dynamic absorber are discussed theoretically and numerically.
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