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The welding defects of TWT collector have an adverse effect on collector's heat dissipation, which easily cause TWT failure, therefore the ultrasonic testing and 3D X-ray testing technology for welding defects of collector are studied. An ultrasonic testing method which can detect three typical brazed areas is presented, and the assessment criteria of welding defects are made. In the research of 3D...
In the type test process of a certain type AC-Driven Electrical Multiple Unit (EMU), because of the logical error of pulse rectifier's carrier phase shifting control, line side harmonic content is amplified. Transient value of line voltage increases and the normal work of other EMU under the same power supply arm is impacted. Through harmonic analysis on test data and line side harmonic characteristic...
Profiled component has some structural features, such as thin wall, small diameter and corner angle on inner wall. These features make it very difficult to detect the profiled component with ultrasound method, and the waves reflected from the inside arris have badly interfered the identification of echo signal. The ultrasonic creeping wave is used to detect the profiled component. In order to eliminate...
In this paper, a multiple fault diagnosis method based on case-based reasoning (CBR) is presented. And the characteristics of multiple fault modes are studied, then the case knowledge library is established for multiple faults, finally a two-step case retrieval strategy is proposed. The candidate case generation method based on the membership weights is employed to initially retrieve, which can reduce...
Using the energy equivalent hypothesis, combining the tension and compression constitutive relation of concrete material in the code for design of concrete structure, the scalar form of damage variable is introduced and a new concrete damage model is proposed so as to use for damage analysis in concrete structures. In order to the unilateral incision concrete beams with a four-point shear loading,...
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