Non-Contact Acoustic Crack Detection for Underwater Structures
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Solution Overview
Problem
Existing technologies struggle to effectively detect small cracks in underwater structures, which are difficult to inspect due to their depth and the challenges of non-destructive testing in such environments.
Innovation Solution
A system utilizing acoustic signals, including acoustic signal transmitters and receivers, is employed to detect cracks in underwater structures by measuring nonlinear acoustic wave interactions, which are sensitive to microscopic defects, allowing for early detection of cracks through harmonic generation analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If visual inspection or ultrasonic testing is used to detect surface cracks, then detection capability is provided, but the inspection process is time-consuming and reduces productivity
Solution Approach 1:
The patent replaces traditional mechanical inspection methods (visual inspection, ultrasonic testing) with acoustic emission sensing technology. Acoustic sensors detect stress waves generated by crack propagation in real-time, enabling continuous monitoring without manual intervention and significantly improving inspection speed while maintaining detection reliability.
Solution Approach 2:
The acoustic emission monitoring system enables continuous real-time detection of crack development during concrete structure loading and service. Unlike periodic manual inspections, the system continuously monitors acoustic signals, allowing immediate detection of crack initiation and propagation, thereby eliminating inspection downtime and improving overall productivity.
2Measurement precision
If traditional non-destructive testing methods are applied, then crack detection is achieved, but the process requires manual intervention and reduces inspection efficiency
Solution Approach 1:
The acoustic emission monitoring system is configured to automatically detect, analyze, and alert on crack events without requiring continuous manual operation. The system self-monitors acoustic signals, automatically identifies crack-related emissions patterns, and triggers alerts when threshold values are exceeded, enabling unattended operation and significantly improving inspection efficiency while maintaining high detection accuracy.
Solution Approach 2:
The system incorporates real-time feedback mechanisms where acoustic sensor data is continuously analyzed and compared against predefined threshold values. When crack-related acoustic emissions exceed these thresholds, the system immediately provides feedback through alerts or notifications, enabling rapid response without manual intervention and improving both detection accuracy and operational efficiency.
3Reliability
If acoustic sensors are placed in concrete structures, then real-time crack monitoring is achieved, but the structural integrity may be compromised by drilling and embedding
Solution Approach 1:
The monitoring system uses multiple distributed acoustic sensors placed at strategic locations throughout the concrete structure. Each sensor independently monitors its local zone for crack-related acoustic emissions. This segmentation approach provides comprehensive real-time coverage while minimizing the number of intrusive installations needed, thereby maintaining structural integrity while achieving reliable monitoring.
Solution Approach 2:
The patent employs acoustic coupling media or surface-mounted sensor configurations that act as intermediaries between the sensors and the concrete structure. These intermediaries enable effective acoustic signal transmission without requiring deep embedding or extensive drilling, thus reducing structural disruption while maintaining real-time monitoring capability.
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 system accurately detects small cracks in underwater structures by measuring nonlinear acoustic wave interactions, enabling early detection and preventive maintenance before significant damage occurs.
Implementation Method 1
an acoustic sensor is attached to the concrete structure. The acoustic sensor is configured to detect stress waves generated by a crack
Data Source
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AI summary
A system for detecting cracks in an underwater structure can include an acoustic signal transmitter configured to be disposed proximate to, but without physically contacting, the underwater structure, where the acoustic signal transmitter is configured to emit acoustic signals. The system can also include an acoustic field receiver configured to be disposed proximate to, but without physically contacting, the underwater structure, where the acoustic field receiver is configured to receive resulting acoustic fields. The system can further include a controller that is configured to receive the resulting acoustic fields from the acoustic field receiver. The controller can also be configured to analyze the resulting acoustic fields signal. The controller can further be configured to detect, based on analyzing the resulting acoustic fields, a crack in the underwater structure.