Magnetic Fluid Coupling for Ultrasonic Detection on Curved Surfaces
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Solution Overview
Problem
Conventional ultrasonic detection methods using liquid couplants face issues such as couplant loss, surface corrosion, and reduced sound transmission when detecting non-planar surfaces, particularly with curved surfaces, due to the characteristics of common couplants like water and oil.
Innovation Solution
A device and method utilizing magnetic fluid coupling with a magnetic field generating apparatus, ultrasonic probe, and flexible fence to maintain a stable magnetic fluid layer, reducing ultrasonic propagation loss and ensuring consistent coupling between the probe and the surface under detection, using magnetic suspension particles and an acoustic impedance matching layer to enhance sound transmission and prevent fluid leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If common couplants such as water are used for ultrasonic detection, then sound energy transmission is improved, but the couplant runs off easily when the member under detection has a curved surface
Solution Approach 1:
The patent changes the physical parameters of the couplant by using magnetic fluid instead of common liquids. The magnetic fluid contains fine magnetic particles that give it higher density and better sound transmission characteristics, while its magnetic properties enable it to adhere to curved surfaces and remain stable during detection
Solution Approach 2:
The patent uses magnetic fluid as a composite couplant that combines liquid properties for sound transmission with magnetic particles for enhanced adhesion and stability. This composite material simultaneously improves sound energy transmission and prevents running off on curved surfaces
2Loss of energy
If glycerin is used as a couplant, then sound energy transmission is improved, but corrosion pits are easily formed on the surface of the member under detection
Solution Approach 1:
The patent replaces glycerin with magnetic fluid that does not cause corrosion. The magnetic fluid can be used repeatedly without degrading the surface, eliminating the harmful corrosion effect while maintaining good sound transmission properties
Solution Approach 2:
The patent changes the chemical composition parameters of the couplant by using magnetic fluid instead of glycerin. The magnetic fluid contains magnetic particles suspended in a carrier liquid that provides good acoustic coupling without the corrosive properties of glycerin
3Reliability
If oil is used as a couplant, then couplant retention on non-planar surfaces is improved, but the thickness of the coupling layer cannot be kept constant
Solution Approach 1:
The patent changes the rheological parameters of the couplant by using magnetic fluid. The magnetic fluid's higher density and magnetic particle content give it better flow characteristics and adhesion properties, allowing it to maintain a uniform thin layer on non-planar surfaces while retaining excellent adhesion
Solution Approach 2:
The patent replaces the purely mechanical adhesion of oil-based couplants with magnetic field-based retention. The magnetic field generates magnetic force to hold the magnetic fluid in place, providing more precise and consistent coupling layer thickness control compared to mechanical adhesion alone
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
The solution improves the accuracy and stability of ultrasonic detection by maintaining a consistent magnetic fluid layer, reducing propagation loss, and enhancing the signal-to-noise ratio, allowing for effective non-destructive testing of mechanical members with curved surfaces.
Implementation Method 1
the magnetic field generating apparatus generates a stable magnetic field in the cylindrical structure, so that the magnetic suspension particles of the magnetic fluid are attracted and attached to the front end of the ultrasonic transducer
Implementation Method 2
the magnetic suspension particles of the magnetic fluid improve the density of the magnetic fluid, improve the sound permeability of the magnetic fluid and reduce the ultrasonic transmission loss
Implementation Method 3
the ultrasonic probe transmits ultrasonic waves that are transmitted to the detected position of the mechanical member under detection through the magnetic fluid
Data Source
AI summary
A device and a method for ultrasonic detecting a mechanical member based on magnetic fluid coupling. The device comprises a magnetic field generating apparatus, magnetic fluid and an ultrasonic probe. The magnetic field generating apparatus has a cylindrical structure, into which the magnetic fluid is injected, where an upper portion of the apparatus is provided with the ultrasonic probe a front end that vertically extends into a liquid level of the magnetic fluid, and a bottom portion of the apparatus covers a detected position of a member under detection. The magnetic fluid at least contains magnetic suspension particles and oil-based or water-based liquid. With the device and the method, the ultrasonic probe is coupled with the member under detection to realize ultrasonic detecting of the service stress of the member under detection.