Multiplexed Structural Health Monitoring System Wiring
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Solution Overview
Problem
Structural health monitoring systems require large numbers of sensing elements and numerous wires, making installation tedious and time-consuming due to the need for individual wiring and management of multiple wires.
Innovation Solution
A system utilizing a single control line to switch multiple monitoring elements on/off and a single signal line for data transmission/reception, reducing the number of wires needed and simplifying installation by using a flexible sensing layer with conductive traces connected to a processor for data analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If large arrays of monitoring elements are used for accurate structural monitoring, then measurement precision is improved, but device complexity and installation time increase due to numerous individual wires
Solution Approach 1:
Multiple individual wire connections for monitoring elements are merged into a single multiplexed communication bus. The patent implements a serial communication interface where multiple sensors share common data and power lines, eliminating the need for separate wires for each sensor and dramatically reducing wiring complexity while maintaining monitoring accuracy
Solution Approach 2:
The communication bus serves multiple functions simultaneously: it provides power delivery, data transmission, and sensor control through a single interface. This multi-functional approach allows the same physical infrastructure to handle various communication protocols and sensor types without requiring separate wiring for each function
2Measurement precision
If individual sensing elements are placed separately at various locations, then measurement precision is improved, but installation time increases
Solution Approach 1:
Multiple separately-placed sensors are electrically merged through a tree-structured wiring topology that converges to a single communication bus. This allows sensors to be distributed across the structure for comprehensive monitoring while the electrical connections are consolidated, reducing the time required for wire routing and termination
Solution Approach 2:
The patent employs pre-assembled sensor modules with integrated wiring and connectors that can be quickly installed at various locations. The modules are pre-configured with the necessary electrical connections, allowing for rapid deployment without requiring complex on-site wire routing and termination for each sensor
3Measurement precision
If large arrays of monitoring elements with multiple wires each are used, then measurement precision is improved, but ease of operation deteriorates due to difficulty in handling and tracking wires
Solution Approach 1:
The patent consolidates multiple individual wire connections into a single shielded communication cable that carries signals for all sensors. This merging transforms the operation from handling numerous separate wires to managing a single organized cable, dramatically improving ease of installation, routing, and maintenance while preserving full sensor array functionality
Solution Approach 2:
A multiplexing device or intelligent hub acts as an intermediary between the single communication bus and the multiple sensors. This intermediary manages signal routing, power distribution, and data aggregation, allowing the system to operate with simple single-bus wiring while maintaining the capability to communicate with numerous individual sensors
Data Source
AI summary
Use of a single line for switching multiple monitoring elements on/off, and a single line for sending signals to, or receiving signals from, those elements that are switched on. Monitoring elements each have an associated switching element, and each switching element is connected to a common switching line, or control line. A signal from the control line turns each switch on or off. Each monitoring element is also connected to a single signal line, and only those monitoring elements that are turned on can transmit/receive data signals along this signal line.