Acoustic Emission Detection for Power Transmission Coupling Failures
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Solution Overview
Problem
Existing non-intrusive monitoring systems fail to effectively detect fatigue-induced failures in power transmission couplings due to interference from background noise and the difficulty of placing sensors close to the coupling membrane, which complicates the detection of individual flexible element defects in power transmission couplings during dynamic operation.
Innovation Solution
An acoustic emission detection system using sensors placed in proximity to the coupling to capture high-frequency airborne sound waves between 25 kHz to 90 kHz, employing advanced signal conditioning and detection algorithms, including Fast Fourier Transformation and high-order statistical analysis, to differentiate defect signals from the coupling membrane and other noise sources, and determine the failure of individual flexible elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If structural acoustic emission sensors are placed on the machinery casing to detect failures, then the monitoring is non-intrusive and does not interfere with production, but the sensor distance from the flexible element causes the sound signal to pass through multiple component interfaces, eliminating the detection chance within the noise of surrounding machinery
Solution Approach 1:
The patent introduces an airborne acoustic wave as an intermediary medium to transmit the failure signal from the flexible element to the sensor. By placing the sensor in the proximity of the coupling and detecting airborne acoustic waves directly in the frequency range 25 kHz to 90 kHz, the signal transmission path is simplified, avoiding multiple component interfaces that would attenuate or block the signal. This intermediary approach enables both non-intrusive monitoring and high detection sensitivity simultaneously.
2Measurement precision
If sensors are placed close to the coupling membrane to detect individual flexible element defects, then the detection sensitivity improves, but the sensor placement becomes complex and intrusive
Solution Approach 1:
The patent replaces the traditional structural acoustic emission sensing method (which requires direct mechanical contact with the coupling membrane) with airborne acoustic wave detection. This substitution allows the sensor to be positioned in the proximity of the coupling without direct contact, eliminating the complexity of sensor placement while maintaining high detection sensitivity for individual flexible element defects.
3Measurement precision
If routine inspection is performed by removing equipment from production, then the inspection accuracy improves, but production is lost during shutdown
Solution Approach 1:
The patent enables preliminary detection of flexible element failures during normal operation by monitoring airborne acoustic waves in real-time. The system detects cracks and fretting between flexible elements before they lead to catastrophic failure, allowing maintenance to be scheduled proactively rather than requiring emergency shutdowns or routine inspections that remove equipment from production. This maintains both inspection accuracy and production continuity.
4Reliability
If the flexible assembly comprises a series of individual flexible elements, then the coupling can function for some time after the first element failure due to fretting between elements, but it becomes difficult to detect failure of an individual flexible element as each element emits a different acoustic trace
Solution Approach 1:
The patent changes the detection parameter from general acoustic traces to specific high-frequency airborne acoustic waves in the range 25 kHz to 90 kHz. By focusing on this specific frequency range and using advanced signal processing techniques, the system can differentiate the acoustic signature of individual flexible element failures from the background noise and other elements, enabling detection of individual element defects while maintaining the functional redundancy provided by the series configuration.
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 early detection of fatigue-induced failures in power transmission couplings, reducing the risk of catastrophic failure by providing real-time monitoring without interfering with production, thus minimizing downtime and ensuring equipment safety.
Implementation Method 1
acoustic emission transducers and apparatuses to monitor specific applications and determine failure of components related to rotating equipment and machinery
Data Source
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AI summary
An apparatus for detecting fatigue induced failure of an assembly having a single flexible element or a series of flexible elements stacked in juxtaposed engagement, for transmitting power from one component to another, the assembly having a cyclic operating speed frequency includes at least one sensor mounted in proximity to said assembly, the sensor providing an analogue signal corresponding to an airborne acoustic signal emitted by the assembly, means for amplifying the analogue signal, filter means to reduce background noise from the analogue signal, an analogue to digital converter for converting the analogue signals to a digital signal, means for sampling the digital signals in respect of the operating speed frequency of the assembly and means for analysing the digital signals and providing an output upon the occurrence of one or more digital signal spikes in an operating cycle.