Stationary Damping Wings for Bridge Vibration Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Large span bridges face significant challenges with wind-induced vibrations and flutter, which can lead to structural instability due to low natural frequencies and inadequate damping, with existing solutions either being costly or inefficient.
Innovation Solution
A device featuring stationary damping wings with a lateral offset from the bridge deck, providing a fixed spatial relationship and large lateral eccentricity to enhance vibration damping efficiency, without moving parts, thereby increasing the critical wind speed and stabilizing the bridge structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aerodynamic control surfaces with mechanical dampers are used, then vibration damping is achieved, but device complexity and cost increase due to moveable parts
Solution Approach 1:
The invention extracts and eliminates the mechanical damper and moveable parts from the vibration damping system, retaining only the essential aerodynamic control surface (wing) that provides damping through its fixed geometric configuration and lateral offset arrangement
Solution Approach 2:
Instead of using a moveable control surface that actively responds to vibrations, the invention uses a fixed control surface with a specific lateral offset arrangement that passively dampens vibrations through aerodynamic forces, inverting the traditional active control approach
2Reliability
If fixed wings are positioned vertically above the bridge deck edges, then structural robustness is improved, but vibration damping efficiency is insufficient
Solution Approach 1:
The invention transitions the wing arrangement from a vertical positioning (above the bridge deck) to a lateral offset positioning (side-by-side with the bridge deck), adding a lateral dimension to the spatial arrangement that significantly improves vibration damping efficiency while maintaining structural robustness
3Length of moving object
If large span lengths are used, then bridge crossing capability is improved, but flutter stability decreases due to low natural frequencies
Solution Approach 1:
The invention introduces damping wings as intermediary aerodynamic elements that mediate between the wind flow and the bridge deck, providing additional damping forces that counteract the reduced natural damping caused by large span lengths and low natural frequencies
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 raises the critical wind speed by 64% and improves torsional divergence stability, offering a robust, reliable, and cost-efficient solution for damping wind-induced vibrations, with potential for placement at specific regions of high vibration amplitude, and is constructed to withstand varying wind directions without additional mechanical connections.
Implementation Method 1
The at least one damping wing is permanently stationary or stationary upon wind acting on the bridge in a given direction
Implementation Method 2
the at least one damping wing dampens vibrations of the bridge
Implementation Method 3
the distance between the center of the at least one damping wing and the center of the bridge deck is at least 1.2 times larger than half the width of the bridge deck
Data Source
AI summary
A damping device for damping vibrations of a bridge with a bridge deck comprises at least one damping wing comprising a center and configured to dampen vibrations of the bridge. A longitudinal direction of the at least one damping wing is disposed parallel to a longitudinal direction of the bridge deck and the at least one damping wing is stationary upon wind acting on the bridge in a given direction. At least one support structure is laterally attached to at least one side of the bridge deck and configured to attach the at least one damping wing to the bridge deck such that the at least one damping wing is disposed with a lateral offset from an outer edge of the bridge deck facing the at least one damping wing.