Magnetic Straking for Flow-Induced Vibration Control

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Solution Overview

Problem

Existing methods for reducing flow-induced vibrations in structures, such as utility or communications towers, are inefficient and costly due to the need for time-consuming finite element analysis and permanent attachment of straking elements, which can lead to material waste and difficulty in adjusting configurations.

Innovation Solution

Magnetic straking elements that can be temporarily attached to ferromagnetic structures, allowing for observation and testing before permanent attachment, enabling easy configuration and reconfiguration to optimize vibration reduction without the need for extensive simulation and analysis.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If finite element analysis and simulation are performed to determine optimal straking configuration, then manufacturing precision and reliability are improved, but loss of time and productivity deteriorate

Engineering Contradiction:

Improvestraking configuration precisionVSAvoidsimulation and analysis time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-configuring straking elements with specific geometries and arrangements that have been previously optimized through FEA analysis. These pre-configured elements can be directly installed without performing new simulations, thus achieving precise straking configuration while eliminating the time-consuming simulation process for each installation.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If straking elements are permanently welded to the structure, then reliability is improved, but adaptability and ease of repair deteriorate

Engineering Contradiction:

Improvestraking attachment reliabilityVSAvoidstraking configuration adaptability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies dynamics by making the straking attachment system adjustable and reconfigurable. The straking elements can be positioned at different locations and orientations along the structure, and the attachment mechanism allows for easy adjustment and reconfiguration. This dynamic system maintains reliable attachment while providing high adaptability for optimizing vibration reduction performance.

Inventive Principle:

Principle #15Dynamics

3Reliability

If multiple straking elements are welded to ensure sufficient vibration damping, then reliability is improved, but loss of substance and cost deteriorate

Engineering Contradiction:

Improvevibration damping effectivenessVSAvoidstraking material usage

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent applies local quality by positioning straking elements at specific critical locations where they are most effective for vibration reduction. Rather than uniformly distributing straking elements along the entire structure, the system identifies and targets specific zones where vortex shedding occurs and applies straking only in those locations. This optimizes material usage while maintaining effective vibration damping.

Inventive Principle:

Principle #3Local quality

4Ease of operation

If straking configuration is adjusted through trial-and-error welding, then ease of operation is improved, but loss of time and productivity deteriorate

Engineering Contradiction:

Improvestraking configuration easeVSAvoidstraking installation productivity

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The patent applies preliminary action by pre-configuring straking elements with optimized geometries and arrangements before installation. The pre-configured elements come ready-to-install with specified positions and orientations determined through prior analysis, eliminating the need for time-consuming trial-and-error welding during field installation while maintaining ease of operation through simple attachment procedures.

Inventive Principle:

Principle #10Preliminary action

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

Enables efficient and cost-effective reduction of flow-induced vibrations by allowing for trial-and-error adjustments and eventual permanent attachment of straking elements, reducing structural damage and material waste while facilitating precise tuning of wind flow around structures.

Implementation Method 1

magnetic straking elements can be temporarily attached to ferromagnetic structures

Methodology Applied

Scientific EffectMagnetic attraction: Magnetism

Implementation Method 2

vortex shedding is a phenomena in which oscillating flow can take place when air moves past a structure at certain velocities

Methodology Applied

Scientific EffectVortex shedding: Kármán Vortex Street

Data Source

PatentUS10072437B1Magnetic straking such as for utility or communications tower

Publication Date: 2018.09.11 SABRE COMMUNICATIONS CORP

AI summary

Magnetic straking can optionally be temporarily attached to a ferromagnetic structure or other structure capable of magnetic attachment thereto, allowing observation or testing of the structure's performance before optional permanent attaching of such straking to the structure, such as by welding or the like.