Underground Structure Impact Detection Using Dual Sensor Arrays
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Solution Overview
Problem
Underground structures are difficult to locate and monitor, leading to risks of damage from nearby construction or excavation, as existing methods lack effective detection and alert systems for impacts and encroachments.
Innovation Solution
A structural health monitoring system comprising sensors on and above ground, using piezoelectric transducers and microphones to detect stress waves and sound waves, respectively, to estimate impact locations and alert systems of potential threats, with a controller generating alerts based on audio signatures and energy profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If underground structures are monitored using traditional methods, then the monitoring coverage is limited, but the detection precision and reliability are insufficient
Solution Approach 1:
The monitoring system is divided into two distinct sensor sets with specialized functions: first set of sensors (piezoelectric transducers) coupled to the underground structure for detecting impacts, and second set of sensors (microphones) positioned above ground for detecting audible events. This segmentation allows each sensor type to be optimized for its specific detection task, improving overall reliability while maintaining manageable system complexity through clear functional separation.
Solution Approach 2:
The controller serves as an intermediary that receives signals from both sensor sets, processes the data, compares audio signatures against stored patterns, and generates alert signals when threats are detected. This intermediary component integrates information from multiple sources and applies decision logic, enhancing detection reliability without requiring direct complex interconnections between all system components.
2Measurement precision
If multiple sensor sets are deployed to improve detection capability, then the detection precision improves, but the device complexity increases
Solution Approach 1:
The system segments detection functions into specialized sensor sets: piezoelectric transducers for structural impact detection and microphones for aerial audible event detection. Each sensor type targets specific physical phenomena, improving measurement precision for different aspects of threat detection while keeping the overall system complexity manageable through functional specialization rather than using multiple instances of a single general-purpose sensor type.
Solution Approach 2:
The controller performs multiple functions: receiving signals from both sensor sets, processing impact detection data, analyzing audio signatures, estimating threat locations, and generating alerts. This multi-functional approach consolidates complexity into a single processing unit rather than requiring separate dedicated systems for each function, thereby improving measurement precision without proportionally increasing device complexity.
3Loss of time
If real-time detection and alerting is implemented, then the safety response time improves, but the energy consumption increases
Solution Approach 1:
The system implements periodic scanning and signal processing rather than continuous high-power operation. The controller periodically analyzes incoming signals from both sensor sets, compares audio signatures against stored patterns, and generates alerts when threats are detected. This periodic action enables real-time threat detection and rapid response while reducing average energy consumption compared to continuous high-intensity monitoring.
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
Effectively detects and alerts for impacts on underground structures, providing location and severity information, and identifies approaching threats, enhancing safety by prioritizing alerts based on imminent danger.
Implementation Method 1
The first set of sensors may comprise piezoelectric transducers. The first set of sensors may be configured to receive stress waves generated in the structure by the impact, to convert the received stress waves to corresponding electrical signals
Implementation Method 2
The second set of sensors may comprise microphones. The second set of sensors may be configured to detect sound waves generated by the audible event, to convert the received sound waves to corresponding signals
Data Source
AI summary
A structural health monitoring system comprises a first set of sensors operable for coupling to a structure positioned under ground, the first set of sensors further configured to detect an impact upon the structure while the first set of sensors is positioned under the ground; a second set of sensors operable to be positioned on or proximate to a surface of the ground, the second set of sensors further configured to detect an audible event occurring at a distance from the second set of sensors and the structure; and a computer readable memory storing one or more audio signatures that may correspond to the audible event.