The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Conference proceedings front matter may contain various advertisements, welcome messages, committee or program information, and other miscellaneous conference information. This may in some cases also include the cover art, table of contents, copyright statements, title-page or half title-pages, blank pages, venue maps or other general information relating to the conference that was part of the original...
The synchronous generator is a primary component of a power plant, requiring periodic inspection to reduce the risk of costly forced outages. The generator retaining rings are a highly stressed component and subject to particular attention, as they play a vital role in securing the generator rotor windings against centrifugal forces during operation. The typical condition assessment regime relies...
Only keep the tracing points of the robot a one-to-one match to the inspected points on the tested part can the detected ultrasonic signals collect the defect information of the tested part correctly during the ultrasonic testing for the complex curved surface. To solve this problem, in this paper, the 6R robot and the ultrasonic sensor are applied to the automatic detection system for the complex...
Fabrication processes, such as, shot peening, bending, and rolling can induce residual stresses in metals that will impact product performance and cause phenomena such as cracking and corrosion. To better manage residual stress tools are needed to map their distribution. Ultrasonic methods can be used as a good tool for residual stress detection, and this approach is non-destructive and costs are...
Ultrasonic Atomic Force Microscopy (Ultrasonic-AFM) was applied to characterize the mechanical properties of an ultra-thin coating layer in a nanoscale thin film system. The modified Hertzian theory was adopted for accurate theoretical analysis of the dynamic characteristics of the ultra-thin coating layer. Aluminum and Titanium thin films with 200 nm thickness were coated on the substrate using the...
This paper proposes a new ferrite-yoke based pulsed induction thermography (PIT) for cracks visualization and quantitative evaluation. The proposed approach combines the advantages of both alternating current field measurement (ACFM) and eddy current pulsed thermography (ECPT) in physical level. It can produce relative uniform heating in surface and subsurface of ferromagnetic material and have an...
In this paper, a software is designed for assisting the detection of pipes on showing wave propagation in pipes. This software could estimate the detection-parameters on given pipe diameters, pipe material, pipe defects and detection-method. Meanwhile, this software simulates the ultrasonic propagation path and calculates the ultrasonic propagation time. At last, this software could simulate the ultrasonic...
Ultrasonic inner testing method can be used to detect almost every kind of flaws in oil and gas transmission pipeline. Due to the large number of transducers on the testing pig, a huge amount of sampling data has been produced which makes data storage and real-time processing impossible. For the purpose of reducing sampling data without loss of resolution, a compressive sampling method applied to...
Microwave based technique plays a vital role in non-destructive testing (NDT) field. A microwave based NDT method has been developed to detect and evaluate atmospheric corrosion under paint. The results are promising, the measurement sensitivity and resolution of microwave NDT can be significantly improved with known the lift-off (air layer) in the corrosion detection applications. The aim of this...
It is difficult and inefficient to detect curved surface thin plate parts when we adopt conventional ultrasonic testing method. Flexible comb transducer, which can excite certain mode guided wave, can be used for the problem to complete the curved surface micro crack detection rapidly. But because of multiple modes when guided waves propagate in thin plate structure, the propagation law is complex...
During the running of nuclear power plant, corrosion products and impurities will be migrated from the secondary circuit to the steam generator. Some of them will stay inside the steam generator as sludge and they will gradually deposit on tube plate, the upper part of support plate, surface of tubes and the gap between the support plate and tubes. These sludge will be deposited on the surface of...
The focusing principle of curved phased array probe was investigated through experiment and acoustic simulation. Two sets of delay time, i.e. the linear and curved array mode, were applied to the curved phased array probe respectively, and the corresponding characteristics of ultrasound field were analyzed. Numerical results show that under the condition of linear array mode, the ultrasound of side...
CNG storage well, long term exposed under effects of sulfur element and underground water, corrodes and thins. To solve this problem, a Gas well NDT system is proposed based on ultrasonic testing. The system mainly includes ultrasonic signal collection and data analysis and display. It utilizes the rotating reflection structure to reflect ultrasound and achieves full coverage downhole detection. The...
The wheel-set maintenance mainly depends on ultrasonic nondestructive testing techniques to detect defects. Wheels are pressed or shrunk on the axle, and the press-fit has significant influence on ultrasonic detection at press-fit part of the in service axle comparing with bare axle. Limited by the complex testing conditions of the press-fit interface, higher amplitude noise is present in the echo...
Eddy current (EC) non-destructive testing (NDT) is one of the most widely used NDT techniques. Electrical conductivity and magnetic permeability of the sample have serious impacts on the detected signal-magnetic flux density (Bz) in the EC NDT. Therefore, how to separate one's impact on the magnetic flux density from another is an important issue, which has abstracted more and more researchers' interests...
This paper reports on a study of the propagation characteristics of visco-elastic, Rayleigh-like waves in coatings. Beginning with the Kelvin model, the characterization equation and the normal displacement of visco-elastic Rayleigh waves in stratified half-space structures are derived and the influence of the visco-elastic modulus on dispersion and attenuation are discussed. The transient response...
Reactor pressure vessels, as the most important security barrier for nuclear power plant safety, are the only part of nuclear power plant that cannot be replaced during the whole life. The security of the vessels is very important for the safety of nuclear power. The nuclear reactor pressure vessels NDT robots are very important equipments. The detection process for these pressure vessels using the...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.