Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 90 for “"eddy current"”.
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Modeling of Eddy Current Separation
Eddy current separation aims to recover non-ferrous metals from non-metals utilizing electromagnetic interactions. In order to describe the separation process, a representative model is needed that can accurately calculate the induced forces. Such a model can be used to optimize the efficiency of …
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Eddy current displacement sensor with LTCC technology
… and information were collected and compared. An eddy current displacement sensor using the novel LTCC technology was found to match the related measurement conditions such as harsh and high temperature environments, non-magnetic metal blades, etc. Then, according to the structure of the LTCC …
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Electromagnetic fields in relation to eddy current gauging
… electromagnetic fields and a non-contact type of eddy current gauge, which utilises a cylindrical solenoid and coaxially positioned metallic bar, either ferrous or non-ferrous.A rigorous mathematical analysis of the eddy current gauging system is presented, together with an evaluation of the …
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Electromagnetic fields in relation to eddy current gauging
… electromagnetic fields and a non-contact type of eddy current gauge, which utilises a cylindrical solenoid and coaxially positioned metallic bar, either ferrous or non-ferrous. A rigorous mathematical analysis of the eddy current gauging system is presented, together with an evaluation of the …
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Eddy current detection of fatigue cracks in drill pipes
… with non-destructive testing (NOT). The eddy current method is an ideal NDT technique as it does not require contact with the test surface and is highly sensitive to fatigue cracks .. However, this method is generally only sensitive to surface and near surface defects. This proves to be a …
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Nonlinear analysis of eddy-current couplings in feedback control systems
A nonlinear analysis is developed for eddy-current couplings in feedback control systems. The analysis makes use of the describing function method to predict transient response. Effects of the nonlinearity are discussed and backed with an analog computer study. Conclusions arrived at show the …
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Finite element method using vector finite elements applied to eddy current problems
… the partial differential equation that governs eddy current behaviour. A finite element algorithm is coded and used to solve this partial differential equation and produce vector field simulations for fundamental eddy current problems.
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Development of Novel Eddy Current Dampers for the Suppression of Structural Vibrations
… damping. Magnetic dampers function through the eddy currents that are generated in a conductive material that experiences a time varying magnetic field. However, following the generation of these currents, the internal resistance of the conductor causes them to dissipate into heat. Because a …
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Signal processing and image restoration techniques for two-dimensional eddy current nondestructive evaluation
… image restoration techniques for two-dimensional eddy current nondestructive evaluation. The basic physical forward method adopted in this study is the volume integral method. We have applied this model to the eddy current modeling problem for half space geometry and thin plate geometry. To reduce …
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Vibration and crack detection in gas turbine engine compressor blades using Eddy current sensors
(cont.) in the ECS signal, no definitive method for sensing blade vibration using an ECS has yet been developed.
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Analysis and design of ferrite cores for eddy current-killed oscillator inductive proximity sensors
… the alternating magnetic field produced by a current-carrying winding. The magnetic flux is specifically aimed at the sensor's metal target, and since the sensing operation is dependent on the generation of eddy currents within the metal target, the range at which the target can be detected is …
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Development of a pulsed eddy current instrument and its application to detect deeply buried corrosion
<p>Eddy current techniques have historically been valuable to nondestructive evaluation and testing. They allow detection of cracks, corrosion, and other inhomogeneities in conducting materials. However, due to the fact that traditionally eddy currents only use one frequency to excite the coil, …
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Inspection of Ferromagnetic Support Structures From Within Alloy 800 Steam Generator Tubes Using Pulsed Eddy Current
… rated for large radiation fields. Conventional eddy current testing (ECT) and ultrasonic testing are currently employed for inspecting SG tubes, with the former doing most inspections due to speed and reliability based on an understanding of how flaws affect coil impedance parameters when …
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Generating and Simulating CANDU® Fuel Channel Eddy Current Data to Demonstrate Multi-Parameter Extraction Capabilities
An eddy current probe known as the gap probe is used in CANDU® (CANadian Deuterium Uranium) nuclear reactors to verify that Pressure Tube to Calandria Tube (PT-CT) gap in Fuel Channels is larger than the minimum requirement. Contact between the two tubes can severely reduce the structural integrity …
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Three-dimensional analytical model with skin effect dedicated to the prediction of the eddy current loss in the permanent magnet in permanent magnet synchronous machine
… we develop a 3-D analytical model for the eddy current loss in the permanent magnet for a permanent magnet synchronous machine with a rated power of 1 MW and an efficiency of 97%. In order to achieve an ambitious power density of 8 hp/lb, which is twice the state-of-the-art value, the …
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The detection of defects in tubes and plates using guided waves
Eddy current testing is the non-destructive test method of choice for the inspection of condenser tubes. However, unplanned shutdowns of power stations, due to unexpected condenser tube failures, still occur despite rigorous eddy current inspection programs. In addition to the improvement required …
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Otimização dos parâmetros de um sensor de correntes parasitas para detecção de defeitos através de simulação eletromagnética
… from these steels. The inspection by eddy current technique is one of the most successful non destructive technique in such cases where the material is an electric conductor. However the efficiency of eddy current probes are intrinsically related to the operation state and the geometry …
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The Application of Mineral Processing Techniques to the Scrap Recycling Industry
… adhere to the new regulations the Eriez RCS eddy current separator system was tested in full scale. The principles this system uses, called circuit analysis, have been used by the mining industry for years, and can be used with any separation system. The Eriez RCS system surpassed the …
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