Ultrasonic Waveform Separation for Corroded Part Evaluation
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Solution Overview
Problem
Current methods for evaluating corroded parts in metal members using ultrasonic waves are limited by noise in waveform diagrams, leading to reduced evaluation accuracy, as there is no established method to separate the noise from the waveform portion reflected by the corroded part.
Innovation Solution
A method utilizing two probes, a transmission unit, and a reception unit to transmit and receive ultrasonic waves, where the distance between the corroded part and the probes is changed to dynamically display the waveform diagram, allowing only the waveform portion reflected by the corroded part to be separated from noise by moving along the time axis and noise intensity to change along the intensity axis, using longitudinal-wave surface waves at 1 MHz or lower.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ultrasonic wave evaluation methods are used, then the evaluation process is simple, but the waveform diagram includes noise that reduces evaluation accuracy
Solution Approach 1:
The waveform diagram is segmented into multiple components: first waveform (reflected from stress concentrated part), second waveform (reflected from corroded part), and noise waveform. By separating these components and evaluating them independently, the evaluation accuracy is improved while managing the complexity through systematic analysis of each segment.
Solution Approach 2:
The useful signal (waveform reflected from corroded part) is extracted from the noisy waveform diagram by identifying and isolating the second waveform component. This extraction process separates the evaluation target from the noise, improving measurement precision without requiring overly complex noise filtering systems.
2Measurement precision
If the waveform diagram includes all received waves, then the complete signal is captured, but the noise prevents accurate evaluation of the corroded part
Solution Approach 1:
The stress concentrated part, which initially causes noise in the waveform diagram, is converted into a beneficial feature. The first waveform reflected from the stress concentrated part serves as a reference signal that helps identify and isolate the second waveform from the corroded part. The noise-generating feature becomes a useful reference for improving evaluation precision.
Solution Approach 2:
The first waveform (reflected from stress concentrated part) acts as an intermediary that facilitates the identification and separation of the second waveform (reflected from corroded part). This intermediary signal enables the extraction of useful information from the noisy waveform diagram without requiring complex external filtering mechanisms.
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 method enables accurate separation and evaluation of the waveform portion reflected by the corroded part, improving evaluation accuracy by reducing noise and allowing for detailed observation of the corroded part's characteristics.
Implementation Method 1
transmitting an ultrasonic wave from the transmission unit... receiving the ultrasonic wave reflected by the corroded part by the reception unit
Implementation Method 2
making the ultrasonic wave pass through a stress concentrated part that is constrained from a portion therearound at the time of being buried and in which stress is more concentrated than the other portions
Data Source
AI summary
To provide a method for evaluating a corroded part, the method making it possible to specify only a waveform reflected by a corroded part and to evaluate the waveform. When a transmission unit (2) is moved on the surface of a metal pipe (60) and the distance between a corroded part (5) and the transmission unit (2) is changed, only a waveform portion A of ultrasonic waves reflected by the corroded part (5) moves toward the left or right along an X axis, and only the intensity of a noise waveform portion B included in a received wave changes upward or downward along a Y axis, which makes it possible to separate the waveform portion A and the noise waveform portion B of a longitudinal-wave surface wave reflected by the corroded part (5) and evaluate the waveform portion A in detail.