Conical Friction Damper With Self-Centering Seismic Energy Dissipation
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Solution Overview
Problem
Existing mechanical dampers are inadequate in effectively dissipating mechanical forces applied to structures during seismic events, leading to potential structural damage and instability.
Innovation Solution
A self-centering conical friction damper is developed, comprising clamping plates, a shear plate, and a conical wedge with a bias mechanism, which utilizes frictional engagement between conical elements to dissipate energy and return to a neutral state, allowing for efficient energy absorption and structural support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional mechanical dampers are used to dissipate seismic forces, then some energy dissipation is achieved, but the dissipation effectiveness is inadequate and structural damage still occurs
Solution Approach 1:
The patent employs conical surfaces instead of traditional planar friction surfaces. The conical wedge elements with curved surfaces provide larger contact areas and more uniform stress distribution, significantly enhancing friction-based energy dissipation effectiveness while maintaining structural reliability during seismic events
Solution Approach 2:
The damper design nests multiple friction interfaces within a compact assembly. The conical wedge elements are positioned between clamping plates, creating nested friction interfaces that multiply energy dissipation mechanisms within a confined space, thereby improving both energy dissipation and structural protection
2Loss of energy
If friction-based dampers are used, then energy dissipation is achieved, but the dampers cannot return to their neutral state after deformation
Solution Approach 1:
The conical wedge elements function as mechanical counterweights that generate restoring forces. When deformed, the geometry of the conical surfaces creates asymmetric friction forces that push the damper components back toward their neutral position, enabling self-centering capability while maintaining effective energy dissipation
Solution Approach 2:
The conical geometry introduces asymmetry in the friction interface. The angled surfaces create different friction characteristics during compression and rebound, generating a net restoring force that returns the damper to its neutral state after seismic deformation, thus achieving both energy dissipation and self-centering
3Loss of energy
If multiple friction interfaces are created to improve energy dissipation, then energy absorption increases, but the device complexity increases
Solution Approach 1:
The conical wedge elements serve multiple functions simultaneously: they provide friction-based energy dissipation, generate self-centering restoring forces, and maintain compact geometry. This multi-functionality achieves high energy absorption capacity without proportionally increasing device complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The damper effectively dissipates mechanical energy from various directions, reduces structural damage, and self-centers after the energy dissipation, ensuring the structure's stability and safety during seismic events.
Implementation Method 1
An active surface portion of the male element is in frictional contact with an active surface portion of the female element with a coefficient of friction μ′
Implementation Method 2
A bias mechanism is operative to compress the shear plate and wedge between the clamping plates
Data Source
AI summary
Example embodiments provide mechanical dampers. The mechanical dampers may be applied to dissipate energy in a structure that arises for example from a dynamic load such as seismic activity, vehicle impact, vibration of the structure, wind forces, an explosion, etc. The damper comprises a pair of clamping plates. A shear plate is held between the clamping plates. The shear plate is movable in transverse directions relative to the clamping plates. The damper also comprises a conical wedge coupled between one of the clamping plates and the shear plate. The conical wedge comprises a female conical element and a male conical element that projects into a conical indentation of the female conical element.