Seismic Isolation Mechanism Dual Damper Segmentation
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Solution Overview
Problem
Existing seismic isolation mechanisms, such as those using laminated rubber bearings with lead plugs, face challenges in ensuring sufficient vibration attenuation during major earthquakes and require improved installation and carrying-in processes.
Innovation Solution
A seismic isolation mechanism featuring two attenuation dampers connected to a seismic isolation apparatus, which are arranged to produce damping forces in one direction, reducing the required stroke and facilitating installation by eliminating the need for long-stroke dampers and preventing buckling, while ensuring sufficient attenuation through simultaneous extension and contraction damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single attenuation damper with long stroke is used to ensure sufficient vibration attenuation, then the damping performance is improved, but the device complexity and installation difficulty increase
Solution Approach 1:
The patent divides a single long-stroke damper into two shorter-stroke dampers connected in series between the superstructure and foundation. Each damper has a stroke of approximately 200mm, while the combined series configuration achieves the equivalent damping effect of a 400mm single damper, thereby improving reliability without excessive complexity
Solution Approach 2:
The patent introduces a seismic isolation apparatus as an intermediary component between the two attenuation dampers. This apparatus includes a transmitting member that allows relative displacement in the vertical direction while transmitting horizontal displacement, effectively coupling the two dampers in series and enabling the system to achieve long-stroke attenuation performance through coordinated operation of shorter components
2Reliability
If attenuation dampers with long stroke are used to ensure sufficient attenuation, then the damping performance is improved, but the ease of operation and installation deteriorate
Solution Approach 1:
By segmenting the attenuation function into two separate dampers with shorter strokes (approximately 200mm each), the patent makes the dampers more manageable for transportation and installation. The shorter stroke dampers can be easily carried and installed without requiring special equipment or complex handling procedures, thus improving ease of operation while maintaining sufficient attenuation performance through the series configuration
3Device complexity
If a single damper is used to attenuate vibration, then the device complexity is reduced, but the reliability and attenuation performance are insufficient for major earthquakes
Solution Approach 1:
The patent employs two attenuation dampers connected in series rather than a single damper. This segmentation allows each damper to operate within its optimal stroke range (approximately 200mm) while the cumulative effect provides sufficient attenuation for major earthquakes, achieving both simplicity and reliability
Solution Approach 2:
The patent ensures continuous damping action throughout the earthquake cycle by configuring two dampers in series with a seismic isolation apparatus. The transmitting member allows vertical displacement while maintaining horizontal coupling, ensuring that both dampers remain engaged and provide continuous attenuation force during the entire vibration cycle, thereby guaranteeing reliable performance during major earthquakes
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
This configuration simplifies the carrying-in and installation of seismic isolation systems, ensures sufficient vibration attenuation, and reduces the risk of damper buckling by distributing damping forces effectively across both dampers.
Implementation Method 1
one attenuation damper which is connected at one horizontal end thereof to the superstructure and connected at another horizontal end thereof to a portion of the seismic isolation apparatus between the one end and the other end thereof to attenuate the vibration of the superstructure with respect to the foundation or the substructure as it is extended and contracted in a horizontal direction
Data Source
AI summary
A seismic isolation mechanism includes a seismic isolation apparatus which is installed at one end in a vertical direction on a superstructure and installed at another end 4 in the vertical direction on a floor serving as a foundation or a substructure to isolate the vibration of the superstructure with respect to the floor; a first attenuation damper which is connected to the superstructure and connected at another end a portion of the seismic isolation apparatus to attenuate the vibration of the superstructure with respect to the floor; and a second attenuation damper.