Cable Damping Device With Transverse Energy Dissipating Elements
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Solution Overview
Problem
Existing damping devices for cable-stayed bridges are ineffective in addressing transverse vibrations, as they are typically positioned close to the anchorage and only act within the plane of the cables, failing to adequately dampen out-of-plane movements.
Innovation Solution
A cable vibration damping device featuring an interconnection structure between at least three cables, with energy dissipating elements oriented perpendicular to the suspension plane to effectively damp transverse vibrations, allowing for flexible positioning and incorporating linear stroke dampers and hydraulic pistons for enhanced damping performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If damping devices are positioned close to the cable anchorage (1-3% of total cable length), then they can effectively dampen vibrations within the cable plane, but they fail to dampen transverse vibrations and have limited positioning flexibility
Solution Approach 1:
The damping device extends in the transverse direction (perpendicular to the suspension plane) by positioning support points at a distance from the cable plane. This dimensional extension allows the energy-dissipating element to respond to transverse vibrations while maintaining connection to cables within the suspension plane, thereby addressing both in-plane and out-of-plane vibrations simultaneously.
Solution Approach 2:
The damping device is designed to perform multiple functions: it dampens both in-plane and out-of-plane vibrations of cables, and can be positioned at various locations along the cable length rather than being constrained to only near the anchorage. This multi-functionality resolves the contradiction by making a single device adaptable to diverse vibration modes and positioning requirements.
2Adaptability or versatility
If damping devices are positioned far from the cable anchorage (5-10% of total length), then positioning flexibility improves, but transverse vibrations remain undampened as the device only acts within the cable plane
Solution Approach 1:
By extending the device structure in the transverse dimension with support points positioned at a distance from the cable plane, the invention enables far-positioned damping devices to effectively dampen transverse vibrations. This dimensional extension allows the energy-dissipating element to counteract out-of-plane movements even when located 5-10% along the cable length from the anchorage.
3Device complexity
If interconnection structure connects only two cables, then device complexity is reduced, but lateral damping effectiveness is insufficient
Solution Approach 1:
The interconnection structure merges three or more cables into a bundled group, creating a collective lateral stiffness that enhances damping effectiveness. By combining multiple cables and their respective dampers working together, the device achieves superior lateral vibration control compared to two-cable configurations, while the modular design keeps complexity manageable.
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 solution effectively dampens transverse vibrations of cables, providing freedom in positioning and ensuring damping in various directions, thereby improving the overall vibration control of cable-stayed bridges.
Implementation Method 1
A pendulum-type damping device comprises an oscillating arm connected to the cable, whose oscillations are damped by viscous friction.
Implementation Method 2
Other devices use linear stroke dampers such as hydraulic pistons.
Data Source
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AI summary
The damping device includes an interconnection structure (30) between cables (16A-C) of a group of at least three cables of the suspension system which extend substantially in the same suspension plane P. The interconnection structure (30) has, outside the plane P, at least one support point for an energy dissipating element (34B-C) arranged to develop a damping force in response to a movement of one of the cables of the group relative to the other cables of the group in a direction perpendicular to the suspension plane.