Spherical Bearing Assembly With Lubricious Liner for Damper Misalignment
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Solution Overview
Problem
Existing damper systems face challenges with internal clearance issues, misalignment, and frictional forces, which affect their performance and reliability, particularly in tall slender buildings where vibrations can lead to structural failure.
Innovation Solution
A spherical bearing assembly with a lubricious liner and alignment features, including PTFE woven fibers, is designed to minimize clearances and accommodate misalignment, coupled with a clearance adjustment system and anti-rotation device to enhance the efficiency and reliability of tuned mass dampers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prior art journal or plain bearings are used with tolerance stack up between assembled components, then the bearing design and construction is relatively simple, but the clearances are too large causing the damper system to be inefficient or unreliable
Solution Approach 1:
The bearing assembly is divided into multiple segments including a first segment with a first spherical interior surface, a second segment with a second spherical interior surface, and a lubricious liner disposed between them. This segmentation allows each component to be precisely manufactured and assembled with controlled clearances, eliminating the tolerance stack-up issues of prior art while maintaining reasonable complexity through modular construction.
2Adaptability or versatility
If prior art spherical bearings are used that can accommodate significant misalignment about one plane, then misalignment capacity is improved, but misalignment capacity about another plane is limited to only minor misalignment
Solution Approach 1:
The bearing assembly utilizes spherical interior surfaces in both the first and second segments, creating a multi-axis spherical bearing configuration. This spheroidal geometry allows the bearing to accommodate significant misalignment about multiple axes simultaneously, rather than being limited to one plane, thereby improving adaptability while maintaining reliability through symmetric load distribution.
3Reliability
If frictional forces are present at joints between components of the TMD, then structural damping is provided, but the frictional forces impede movement reducing the effectiveness of the TMD
Solution Approach 1:
A lubricious liner is introduced as an intermediary material disposed between the first and second spherical interior surfaces of the bearing segments. This liner reduces frictional forces at the joint interfaces, allowing the TMD mass to move freely while still providing necessary structural damping, thereby resolving the contradiction between damping effectiveness and movement freedom.
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 spherical bearing assembly effectively reduces friction and allows for efficient damping in multi-axis rotation, improving the performance and reliability of damper systems by minimizing internal clearances and accommodating significant misalignment, thereby reducing the risk of structural failure in tall buildings.
Implementation Method 1
A lubricious liner is disposed between the enclosure and the ball
Implementation Method 2
including PTFE woven fibers
Implementation Method 3
spherical bearing assembly with a lubricious liner and alignment features
Implementation Method 4
Viscous dampers often couple to the TMD mass to the building structure
Implementation Method 5
frictional or hydraulic component that turns mechanical kinetic energy into heat
Data Source
AI summary
A spherical bearing for a damper system includes a first segment and a second segment with a ball therebetween. The ball includes a shaft extending therefrom. The shaft extends out of the first segment. A lubricious liner is disposed between the first segment and the second segment.