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US 12,631,041 B2Granted
Multidirectional hysteretic damper endowed with negative stiffness
AssigneeUniversita' Degli Studi Di Roma “La Sapienza”
InventorsAndrea Salvatore, Biagio Carboni, Walter Lacarbonara
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Abstract
Provided is a mechanical device to be connected in series or in parallel to a structure to be protected from dynamic stresses so as to vary mechanical features of the system and control the general dynamic behavior. The mechanical device is a multi-purpose rheological element employable in various applications including vibration isolation, vibration absorption, shock absorption, energy dissipation, and other applications based on rheological force-movement behavior.
Claims16
A multidirectional hysteretic damper with negative stiffness, comprising:
- a first base fixable to a first structure and facing a second base fixable to a second structure;
- wherein said first and second bases extend parallel to a horizontal plane, the multidirectional hysteretic damper further comprising:
- a connecting rod with an elongated body extended in a main extension direction, a first spherical head and a second spherical head being fixed at opposite ends of the elongated body;
- a first housing connected to said first base, the first housing being configured to partially accommodate said first spherical head so that said connecting rod can rotate in every direction of said horizontal plane;
- a second housing in or rigidly connected to said second base, the second housing being configured to partially accommodate said second spherical head so that said connecting rod can rotate in every direction of said horizontal plane;
- a plurality of ropes connected between said first and second bases, arranged parallel about said connecting rod when the multidirectional hysteretic damper is at rest;
- and
- an elastic means with a first end and a second opposite end fixed to said first base, and to a movable wall in which said first housing is formed, respectively;
- and
- wherein the plurality of ropes is pre-tensioned so as to keep the connecting rod, when the multidirectional hysteretic damper is at rest, in a configuration perpendicular to said horizontal plane.
7 more elements
Dependencies are inferred from the claim text.