In this paper authors propose a liquid inertia damper that has a screw shaped piston in order to have effect of a series inertia mass. The damper consists of a piston and a cylinder, a screw shaped piston. Water is filled in the cylinder. The peripheral gap of the screw can act as an orifice of a by-pass pipe, and an inertia force is produced by a liquid flow through the gap. In order to confirm the inertia force, a test damper is manufactured, and resisting force characteristics are measured. It is apparent from test results that the damper can have a sum of the inertia force and nonlinear damping force. The series inertia mass is depended on a relation between a diameter of the cylinder and a gap of the screw. To confirm the vibration reduction, harmonic frequency response of one-degree-of-freedom system with the liquid inertia damper is calculated. Finally, the effects of vibration suppression are confirmed numerically.
Liquid Inertia Damper Having a Screw Shaped Piston
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Matsuoka, T. "Liquid Inertia Damper Having a Screw Shaped Piston." Proceedings of the ASME 2012 Pressure Vessels and Piping Conference. Volume 8: Seismic Engineering. Toronto, Ontario, Canada. July 15–19, 2012. pp. 3-6. ASME. https://doi.org/10.1115/PVP2012-78419
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