Hybrid Sensor Network for Structural Damage Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current structural health monitoring systems face challenges in efficiently detecting load changes and analyzing resulting damage, as purely passive systems only detect load changes without diagnosis, while purely active systems waste energy by constantly querying the structure, and both require numerous sensors and wires, making installation and management cumbersome.
Innovation Solution
A hybrid system integrating passive sensors and actuators with a controller to detect load changes and transmit stress waves for determining damage location and size, allowing for simultaneous passive detection and active analysis within a single layer, reducing the need for multiple sensors and wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If purely passive systems are used to detect load changes, then energy consumption is reduced, but the ability to analyze damage location and size is insufficient
Solution Approach 1:
The system dynamically switches between passive detection mode (for energy-efficient load change detection) and active interrogation mode (for damage location and size analysis). The controller activates actuators only when passive sensors detect load changes, enabling the system to adapt its operational state based on detected conditions and resolve the contradiction between energy consumption and analysis capability.
Solution Approach 2:
The system employs periodic active interrogation of the structure using stress waves generated by actuators. This periodic action is triggered only when passive sensors detect load changes, allowing the system to maintain low energy consumption while periodically performing thorough damage analysis when needed.
2Difficulty of detecting and measuring
If purely active systems are used to query structure dynamics, then damage analysis capability is improved, but energy consumption increases due to constant querying
Solution Approach 1:
The system dynamically switches between passive detection mode (for energy-efficient load change detection) and active interrogation mode (for damage location and size analysis). The controller activates actuators only when passive sensors detect load changes, enabling the system to adapt its operational state based on detected conditions and resolve the contradiction between energy consumption and analysis capability.
Solution Approach 2:
The controller uses feedback from passive sensors detecting load changes to trigger active interrogation by actuators. This feedback mechanism ensures that energy-intensive active querying occurs only when necessary, optimizing the balance between damage analysis capability and energy consumption.
3Measurement precision
If large arrays of individual sensing elements are used, then measurement precision is improved, but device complexity and installation time increase
Solution Approach 1:
The patent combines multiple sensing elements and actuators into an integrated array system where individual elements are merged into a unified structure. This merging reduces the number of separate components, simplifies installation, and decreases overall system complexity while maintaining the measurement precision achieved through the coordinated operation of multiple elements.
Solution Approach 2:
The integrated array system performs multiple functions simultaneously - both sensing and actuation are combined in a single structure. This multi-functionality reduces device complexity by eliminating the need for separate sensor and actuator arrays, while maintaining comprehensive detection and analysis capabilities through the universal array system.
4Measurement precision
If large arrays of sensing elements with multiple wires are used, then measurement precision is improved, but ease of operation and installation is worsened
Solution Approach 1:
The patent combines multiple sensing elements and actuators into an integrated array system where individual elements are merged into a unified structure. This merging reduces the number of separate components, simplifies installation, and decreases overall system complexity while maintaining the measurement precision achieved through the coordinated operation of multiple elements.
Solution Approach 2:
The system uses a simplified digital representation or model of the physical array configuration to manage and control the sensing elements. This copying approach allows for easier programming and control of the array without requiring complex physical wiring for each individual element, thereby improving installation ease while maintaining measurement precision.
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
This hybrid system effectively detects and analyzes damage regions by combining the advantages of passive and active systems, reducing energy waste and installation complexity, while providing accurate location and size determination of damage through various analysis methods.
Implementation Method 1
direct the plurality of actuators to transmit stress waves through the structure so as to determine the location and the size of the damage region
Data Source
AI summary
A sensor network is attached to a structure and employed to detect and analyze load changes. The sensor network has transducers, capable of acting as both passive sensors and active actuators, integrated within it. In a passive mode, the transducers detect load changes upon the structure, such as impacts. Upon detection of a load change, the transducers are engaged in an active mode to actively scan the impact area to determine the location and size of any resulting damage region. In this manner, passive and active systems are integrated within a single, convenient layer that possesses the best features of both active systems and passive systems.