Structure Evaluation System Using Controlled Elastic Wave Impacts
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Solution Overview
Problem
Existing structure evaluation methods face challenges in efficiently locating damage sources within structures due to interference from external noise sources like rainfall, which hinders accurate detection of damage through elastic wave propagation.
Innovation Solution
A structure evaluation system comprising an impact imparting unit, sensors, and a signal processor that applies controlled impacts to generate elastic waves, processes the signals to extract feature amounts, and uses a position locator to determine the generation source distribution, allowing for precise evaluation of structural deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If rainfall is used to generate elastic waves for structure evaluation, then measurement can be performed without additional equipment, but measurement efficiency is insufficient and accurate location of damage sources cannot be achieved
Solution Approach 1:
The system performs preliminary localization of elastic wave generation sources using rainfall-generated waves before applying controlled impacts. This preliminary action identifies candidate damage locations, allowing subsequent impact-based measurements to be focused on specific areas, thereby improving overall measurement efficiency while maintaining the simplicity of using natural rainfall when available
Solution Approach 2:
The system introduces an impact imparting unit as an intermediary that applies controlled impacts to generate elastic waves. This intermediary enables active generation of elastic waves with known source positions and characteristics, allowing for more efficient and accurate damage detection compared to passive reliance on rainfall alone
2Device complexity
If rainfall-generated elastic waves are used for damage detection, then no additional impact equipment is needed, but the generation position of elastic waves cannot be correctly located due to propagation path damage
Solution Approach 1:
The system dynamically switches between two measurement modes: using rainfall-generated elastic waves when no damage is present on propagation paths, and using impact-generated elastic waves when damage is detected. This dynamic adaptation allows the system to maintain measurement precision by selecting the appropriate wave generation method based on real-time structural conditions
Solution Approach 2:
The measurement process is segmented into two stages: first using rainfall-generated waves for preliminary damage screening, then using impact-generated waves for precise localization when damage is suspected. This segmentation allows each method to be used in its optimal scenario, balancing equipment simplicity with measurement accuracy
3Measurement precision
If multiple sensors are installed to locate elastic wave generation sources, then position localization is possible, but measurement time increases and efficiency decreases
Solution Approach 1:
The system performs preliminary localization using rainfall-generated elastic waves to identify candidate damage locations before applying controlled impacts. This preliminary action narrows down the search area, allowing subsequent measurements to be focused on specific regions, thereby reducing the overall measurement time while maintaining accurate location capability
Solution Approach 2:
Instead of using all sensors continuously for full-coverage measurements, the system uses sensors selectively based on preliminary localization results. By focusing measurements on areas identified as potential damage zones, the system achieves accurate localization with reduced measurement time compared to exhaustive full-structure scanning
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 enables efficient and accurate evaluation of structural deterioration by optimizing impact timing and intensity to separate and detect elastic waves, improving measurement efficiency and accuracy.
Implementation Method 1
an impact imparting unit 10 that imparts an impact to a structure 50
Implementation Method 2
generates elastic waves in response to the applied impact
Implementation Method 3
a sensor 20 that detects the elastic waves
Data Source
Figure 1
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AI summary
A structure evaluation system according to an embodiment includes an impact imparting unit, a sensor, and a structure evaluation device. The impact imparting unit applies impacts to a structure. The impact imparting unit applies the impacts at a frequency equal to or less than a frequency determined in accordance with an intensity at which the impacts are imparted. The sensor detects elastic waves. The structure evaluation device evaluates a deterioration state of the structure on the basis of the detected elastic waves.