Vibration-Based Damage Inspection Using Coherence Indicators
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional object damage inspection systems require measuring both input and output signals to calculate the frequency response function, leading to complex system configurations and increased costs.
Innovation Solution
An object damage inspection system that uses only the output value from a test object, employing a vibration exciter, sensor, and damage determiner to calculate a coherence indicator value between the test object and a reference object, allowing for the detection of physical damage without requiring input signal measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If both input signal and output signal are measured to calculate frequency response function, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent extracts and removes the input signal measurement component from the inspection system. By using only the output signal from the sensor to calculate the frequency response function, the system eliminates the need for input signal measurement devices, thereby reducing device complexity while maintaining measurement capability through alternative calculation methods
Solution Approach 2:
The patent uses a reference object with known good frequency response characteristics to create a reference frequency response function. This reference function serves as a template to compare against the test object's frequency response, enabling damage detection without requiring direct input signal measurement on the test object itself
2Reliability
If both input signal and output signal measurement systems are implemented, then inspection reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent removes the input signal measurement subsystem from the inspection system configuration. By calculating the frequency response function using only the output signal and reference data, the system reduces component count and manufacturing cost while maintaining inspection reliability through the reference comparison method
Solution Approach 2:
The system uses the test object's own response characteristics combined with a reference model to perform self-diagnosis. The coherence calculator and damage detector use the output signal alone, compared against reference data, to automatically determine damage presence without requiring separate input measurement systems
3Device complexity
If simplified output-only measurement is used, then device complexity is reduced, but measurement precision may deteriorate
Solution Approach 1:
The patent performs preliminary measurement and storage of the reference object's frequency response function before actual inspection. This pre-established reference serves as a baseline for accurate comparison, compensating for the simplified measurement approach and maintaining precision through the coherence calculation between reference and test object responses
Solution Approach 2:
The system implements feedback through the coherence calculation process, which compares the test object's frequency response against the reference and provides damage detection feedback. This feedback mechanism ensures measurement precision by continuously validating results against known good characteristics
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
Simplifies the inspection system configuration, reduces costs, and enables analysis of damage location along with the presence or absence of physical damage in the inspection target object.
Implementation Method 1
a vibration exciter for setting a vibration exciting pattern and applying a physical force to one face of the fixed test object based on the set vibration exciting pattern
Implementation Method 2
a sensor contacting a portion of the test object, wherein the sensor collects a vibration signal generated from the test object when the physical force is applied thereto
Data Source
AI summary
Disclosed are an object damage inspection system and an object damage inspection method using the same. The system includes a vibration exciter for setting a vibration exciting pattern and applying a physical force to one face of the fixed test object based on the set vibration exciting pattern; a sensor contacting a portion of the test object, wherein the sensor collects a vibration signal generated from the test object when the physical force is applied thereto; and a damage determiner configured to determine whether the test object has physical damage, based on a test object measurement frequency signal and a reference object measurement frequency signal, wherein the test object measurement frequency signal includes a frequency domain signal into which the vibration signal collected by the sensor is converted.