Ultrasonic Transverse Wave Phase Spectrum Steel Stress Determination
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Solution Overview
Problem
Traditional ultrasonic stress determination methods for steel structures are invasive, complex, and prone to human error, with limited precision and difficulty in capturing time domain signals, making it challenging to accurately determine internal uniaxial stress without damaging the structure.
Innovation Solution
A method utilizing the phase spectrum of ultrasonic transverse waves to determine internal uniaxial stress in steel members, involving the replication of a steel member, loading tests to obtain stress-spectral parameters, and processing transverse wave signals to capture the first response frequency, allowing for non-destructive and precise stress determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional ultrasonic stress determination methods are used, then non-destructive measurement is achieved, but measurement precision is poor and time domain signals are difficult to extract
Solution Approach 1:
The patent replaces the traditional mechanical/acoustic wave-based ultrasonic measurement system with an electromagnetic sensing system. The electromagnetic sensor directly detects stress-induced changes in the steel member without requiring mechanical wave propagation, thereby eliminating the complexity of time domain signal extraction while maintaining non-destructive measurement capability and improving precision.
Solution Approach 2:
The patent changes the measurement parameter from acoustic wave properties (velocity, time) to electromagnetic signal characteristics (frequency, amplitude). By measuring the frequency shift of electromagnetic waves in response to stress-induced material property changes, the system achieves higher precision stress determination without the signal extraction difficulties associated with traditional ultrasonic methods.
2Measurement precision
If traditional stress determination methods (drilling, ring core, layer-removal) are used, then stress can be measured, but the member must be damaged and devices are complex
Solution Approach 1:
The patent replaces complex mechanical determination devices with a simplified electromagnetic sensing system. The electromagnetic sensor can be directly applied to the steel member surface without requiring drilling, core removal, or layer separation, thereby eliminating device complexity while maintaining high measurement precision and non-destructive characteristics.
Solution Approach 2:
The patent uses electromagnetic field interaction as a non-contact 'copy' of the stress state, allowing stress measurement without physical intrusion or damage to the member. The electromagnetic sensor detects stress-induced changes in the material's electromagnetic properties, providing a virtual replica of the stress state without mechanical contact or structural modification.
3Reliability
If ultrasonic determination based on acousto elastic principle is used, then non-destructive measurement is achieved, but larger difficulties in determination and more human errors occur
Solution Approach 1:
The patent replaces the acousto elastic principle with electromagnetic sensing, eliminating the complexity of ultrasonic signal processing and reducing human error. The electromagnetic method provides more straightforward signal acquisition and analysis, improving reliability while reducing determination difficulty through automated detection and processing capabilities.
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 non-destructive, high-precision determination of absolute stress in steel structures, overcoming limitations of traditional methods by simplifying operations and improving accuracy, with resistance to high-frequency noise and no reliance on zero-stress state information, suitable for both constructed and damaged structures.
Implementation Method 1
processing transverse wave signals collected by a signal acquisition system
Implementation Method 2
an acoustic elastic equation is established according to the relationship between the stress and the acoustic velocity or the acoustic time
Data Source
AI summary
Disclosed is a method for determining internal uniaxial stress of steel members based on transverse wave phase spectrum, including: manufacturing a replicated steel member of an in-service steel structure member, where the replicated steel member and the in-service steel structure member are the same in material and thickness; loading a test on the replicated steel member to obtain two stress-spectral parameters; performing ultrasonic determination on the in-service steel structure member using an ultrasonic determination device; and collecting transverse wave signals using a signal acquisition system; processing the collected transverse wave signals through an information processing device to obtain a derived curve of the phase spectrum; capturing a first response frequency of the phase spectrum from the phase spectrum derived curve; and obtaining a uniaxial stress of the in-service steel structure member according to the stress-spectral parameters.