Solid Axle Inspection Using Inserted Ultrasonic Probe
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Solution Overview
Problem
Current methods for inspecting solid axles using single-element ultrasonic or phased array probes are limited by the need for multiple angles and access points, leading to incomplete coverage and potential false indications due to geometrical reflections, and are time-consuming, especially when the axle's surface is protected by paint.
Innovation Solution
An ultrasonic inspection system and method utilizing a probe inserted into a blind hole of the solid axle, equipped with angle beam and longitudinal beam transducers or phased array transducers, capable of generating ultrasonic waves that cover the entire skin surface or volume, with automatic centering and securing mechanisms, and advanced data processing for accurate flaw detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If single-element ultrasonic probes with different angles or phased array probes are used for inspection, then the inspection coverage can be improved, but the inspection time increases significantly due to requiring multiple angles and repetitions
Solution Approach 1:
The inspection system segments the ultrasonic testing into multiple wave mode groups (longitudinal waves, shear waves, surface waves) that can be executed in sequence from a single probe position. Each group targets specific regions or flaw types, allowing comprehensive coverage without requiring multiple physical probe repetitions, thus reducing inspection time while maintaining coverage.
Solution Approach 2:
The patent introduces a new dimension of inspection by utilizing multiple ultrasonic wave modes (longitudinal, shear, surface waves) simultaneously or sequentially from the same probe position. This multi-dimensional approach allows comprehensive volume coverage without requiring multiple angular repetitions, resolving the time-coverage tradeoff.
2Reliability
If the axle surface is protected with thick paint, then the axle is protected from corrosion and wear, but proper ultrasonic coupling becomes impossible making inspection difficult
Solution Approach 1:
The patent introduces a coupling agent as an intermediary substance applied to the painted axle surface before probe contact. This mediator enables effective ultrasonic wave transmission through the paint layer while maintaining the paint's protective function, thus resolving the contradiction between protection and inspectability.
Solution Approach 2:
The inspection process applies coupling agent preliminarily to the painted surface before performing ultrasonic testing. This preliminary action prepares the surface for effective coupling without removing or compromising the protective paint coating, allowing both protection and inspection to coexist.
3Strength
If threaded holes are formed in the axle front face for fixing caps, then the caps can be securely attached, but certain areas or angular sectors become inaccessible for inspection
Solution Approach 1:
Instead of accessing the axle from the front face (which is blocked by threaded holes), the patent inserts the probe through the threaded holes from the front and performs inspection from the rear end of the holes. This inverted approach allows ultrasonic waves to propagate through the axle body and inspect regions that would be inaccessible from the front face.
Solution Approach 2:
The probe is inserted into and nested within the threaded holes that were originally designed for cap attachment. This nesting approach utilizes the existing hole structure as an access pathway, allowing inspection without requiring additional access points while maintaining the original cap attachment function.
4Measurement precision
If phased array probes are inserted in the cone-shaped stud hole for testing, then the front journal or wheel set area can be inspected, but the body of the axle cannot be covered
Solution Approach 1:
The patent employs a multi-functional probe system capable of generating multiple ultrasonic wave modes (longitudinal, shear, surface waves) and performing multiple scanning patterns from a single probe position. This universal probe can inspect both the front journal area (using conventional phased array techniques) and the axle body (using through-transmission and surface wave techniques), eliminating the need for multiple specialized probes.
Solution Approach 2:
The inspection system dynamically adjusts the ultrasonic wave parameters (wave mode, propagation direction, frequency) based on the inspection target. The same probe can switch between different wave modes and scanning patterns to effectively inspect different regions of the axle, providing dynamic adaptability that covers both front journal and body areas.
5Productivity
If geometrical reflections from the axle are present during inspection, then the inspection can be performed, but false indications or hidden signals from relevant flaws may occur
Solution Approach 1:
The patent utilizes changes in ultrasonic wave parameters (wave mode, frequency, propagation angle) to differentiate between geometrical reflections and flaw signals. By analyzing the characteristics of reflected waves across multiple parameters, the system can distinguish true flaws from false indications caused by geometrical reflections, improving detection accuracy.
Solution Approach 2:
The inspection system incorporates feedback mechanisms that analyze the received ultrasonic signals and adjust the inspection parameters accordingly. By comparing expected reflection patterns with actual signals and using reference data from known good areas, the system can identify and filter out false indications from geometrical reflections, improving flaw detection reliability.
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 comprehensive and efficient inspection of solid axles, covering 100% of the surface or volume, reducing false indications and improving detection accuracy, even when the axle is mounted on a train with protective coatings, by using phased array ultrasonic technology and advanced data acquisition techniques.
Implementation Method 1
The probe includes an ultrasonic transducer at an end face thereof that is configured to generate ultrasonic waves in the solid axle
Implementation Method 2
A-Scan data is conventionally used in testing, which limits the comprehensive documentation of the testing results
Implementation Method 3
the ultrasonic transducer can include an angle beam ultrasonic transducer configured to propagate a shear wave
Implementation Method 4
a longitudinal beam ultrasonic transducer configured to propagate a compression wave
Implementation Method 5
phased array (PA) UT probes with an electronic steering capability
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Methods, systems, and devices for solid axle testing are provided, wherein a probe (26) including an ultrasonic transducer (38, 40) is inserted into a blind hole (20) formed in the solid axle (16).