Vibration Signal Conversion for Structural Attenuation Measurement
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Solution Overview
Problem
Existing methods for determining the attenuation characteristic of structural bodies, such as bridges, are inadequate as they do not effectively calculate this critical parameter, which is essential for assessing the state of the structural body.
Innovation Solution
A measurement apparatus and method that converts vibration signal information from a structural body into distance-based information, allowing for the calculation of attenuation characteristics using a vibration detector, speed calculation, and an attenuation characteristic calculation section, which also includes an estimation section for detecting abnormalities and outputting results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If vibration signal information is converted from time-based to distance-based function, then attenuation characteristic calculation becomes feasible, but measurement system complexity increases
Solution Approach 1:
The patent introduces a speed calculation section as an intermediary component that calculates the speed of the moving object based on vibration signals. This speed information serves as a mediator to convert the time-based vibration signals into distance-based information, enabling attenuation characteristic calculation without directly complicating the overall measurement system architecture
Solution Approach 2:
The patent transforms the measurement parameter from time-based to distance-based by utilizing the speed of the moving object. The conversion section changes the independent variable of the vibration signal from time to distance, allowing the attenuation characteristic to be calculated based on distance rather than time, thus solving the measurement precision issue
2Measurement precision
If multiple sensors and complex processing are used to determine attenuation characteristic, then measurement accuracy improves, but ease of operation deteriorates
Solution Approach 1:
The patent utilizes the moving object itself as a source of vibration excitation. The moving object naturally generates vibration signals as it travels across the structural body, eliminating the need for external excitation devices. The system automatically calculates speed and converts signals, making the operation simple while maintaining measurement accuracy
Solution Approach 2:
The vibration detector serves multiple functions: it detects both the vibration signals from the moving object and uses these same signals to calculate the speed of the moving object. This multi-functionality reduces the number of separate components needed, improving ease of operation 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
Enables the efficient and accurate determination of attenuation characteristics and detection of structural abnormalities, facilitating timely maintenance and ensuring the integrity of the structural body.
Implementation Method 1
a vibration detector provided on a structural body... outputted from a vibration detector
Data Source
AI summary
A conversion section converts a change in signal information outputted from a vibration detector provided on a structural body from the change in the function of time into the change in the function of the distance between a moving object that moves on the structural body and the vibration detector. An attenuation characteristic calculation section calculates an attenuation characteristic of the structural body based on the signal information so converted as to represent the change in the function of the distance.