Rotating Element Structural Health Monitoring via Brush Interface
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Solution Overview
Problem
Rotating elements, such as shafts, pose challenges for structural health monitoring due to difficulties in maintaining reliable electrical connections for sensors during rotation and the underdevelopment of remote sensing methods that do not require contact with the rotating element.
Innovation Solution
A structural health monitoring system with a rotatable structure and sensors connected via an interface having an inner and outer housing, where conductive brushes maintain electrical connections between sensors and the outer housing, allowing for rotation while maintaining contact through frictional bristles, enabling continuous monitoring of rotating parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are placed directly on rotating elements, then structural health monitoring capability is improved, but maintaining reliable electrical connections during rotation becomes difficult
Solution Approach 1:
The patent introduces an intermediary electrical connection system consisting of contactless power transfer components and signal transmission devices that mediate between the rotating sensors and the stationary external system. This intermediary mechanism enables electrical connections without direct physical contact, resolving the contradiction between maintaining measurement capability and ensuring connection reliability during rotation.
Solution Approach 2:
The patent replaces traditional mechanical electrical connections (slip rings, brushes) with contactless electromagnetic field-based power and signal transmission. This substitution eliminates mechanical wear and connection instability, allowing sensors on rotating elements to maintain reliable electrical connections throughout operation.
2Ease of operation
If remote sensing methods are developed to monitor without contacting the rotating element, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent merges the advantages of contactless operation with direct sensing capability by integrating sensors directly onto the rotating element while providing contactless electrical connections. This combination achieves both ease of operation (no contact required) and high measurement precision (direct sensing), resolving the contradiction between these two features.
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 real-time monitoring and diagnosis of rotating structures by maintaining electrical connections during rotation, allowing for effective structural health assessment and detection of issues like fatigue cracks and stress waves.
Implementation Method 1
each conductive brush may have one or more conductive bristles placed in frictional contact with the outer housing so as to allow the outer housing to rotate with respect to the inner housing while the each conductive brush maintains an electrical connection
Implementation Method 2
The sensors may be piezoelectric transducers configured to transmit stress waves through the structure and to detect stress waves generated within the structure.
Data Source
AI summary
A structural health monitoring system capable of maintaining electrical contact with sensors affixed to a rotating structure. One such structural health monitoring system comprises a rotatable structure, a plurality of sensors each affixed to the rotatable structure, and an interface. The interface has an inner housing and an outer housing, and maintains a plurality of individual electrical connections, each of the individual electrical connections being an electrical connection between one of the sensors and an electrical contact maintained on the outer housing, the electrical connections configured to be maintained during rotation of the structure. The inner housing is affixed to the structure and the outer housing is rotationally coupled to the inner housing, so that the inner housing is free to rotate with respect to the outer housing during rotation of the structure and the sensors, while maintaining the electrical connections.