Wire Rope Magnetic Flux Inspection with Baseline Signal Cancellation
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Solution Overview
Problem
Conventional wire rope inspection devices struggle with accurately detecting damage due to noise data from changes in leakage magnetic flux in undamaged portions, making it difficult to distinguish actual damage from intrinsic magnetic property variations.
Innovation Solution
A wire rope inspection device and method that utilizes a detection coil to measure and cancel intrinsic magnetic property changes by comparing first and second detection signals at the same position, adjusting magnetization direction, and correcting for sensitivity and position, thereby isolating noise data and enhancing damage detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a detection coil is used to detect leakage magnetic flux of a wire rope, then damage detection capability is provided, but noise data from intrinsic magnetic property changes deteriorates measurement precision
Solution Approach 1:
The patent applies preliminary action by performing a first measurement to acquire baseline detection signals before the actual damage detection. The controller stores these baseline signals and uses them to cancel out intrinsic magnetic property variations during subsequent measurements, thereby isolating actual damage signals from noise
Solution Approach 2:
The patent extracts the harmful intrinsic magnetic property variations from the total detection signal by comparing with baseline measurements. The controller separates the noise component (intrinsic magnetic property changes) from the useful signal (actual damage), allowing precise damage detection without interference
2Measurement precision
If multiple measurements are performed to cancel noise, then damage detection accuracy is improved, but inspection time increases
Solution Approach 1:
The patent performs measurements efficiently by acquiring baseline data during initial inspection and using it for multiple subsequent comparisons. This preliminary action reduces the need for repeated baseline measurements, thereby minimizing additional inspection time while maintaining high damage detection accuracy
Solution Approach 2:
The controller uses feedback from baseline measurements to continuously improve damage detection accuracy. By comparing current measurements against stored baseline signals, the system automatically cancels intrinsic variations without requiring manual intervention or repeated full inspection cycles
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
Accurately distinguishes damaged and undamaged portions of wire ropes by reducing the influence of intrinsic magnetic property noise, allowing for precise detection of defects such as wear, corrosion, and structural changes.
Implementation Method 1
a detection coil configured to detect a change in a magnetic field of a wire rope
Implementation Method 2
a detection coil that detects the leakage magnetic flux of a wire rope
Data Source
Figure 1~2
Figure 3~4
Figure 5(A)~5(C)
AI summary
A wire rope inspection device (100) includes a controller 21 configured or programmed to detect a state of a wire rope (W) based on a difference at substantially a same position between a first detection signal acquired by a differential coil (10) in a first measurement and a second detection signal acquired by the differential coil in a second measurement after the first measurement.