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Defects in the weld of hydro turbine runner are difficult to be detected by conventional ultrasonic testing because of the distorted surface and variational cross-section of blade. Ultrasonic phased array inspection technology was used to inspect the weld for its dynamic focusing. The testing procedure was created based on the ultrasonic testing numerical model and quantitative evaluated based on...
This paper presents a specific method that uses the transfer matrix [A] to analyze insertion loss of EMI filter. Based on the EMC standard emission limit, the needed insertion loss is calculated. Then proper EMI filter and components with appropriate parameters are selected to design the power supply EMI filter. Finally some experiments are made to verify the validity of the filter.
This paper deals with the dc magnetic biasing of high frequency transformer of the isolated full bridge converter. Analytical calculations are given detailed based on the modes of the converter considering leakage inductance. Herewith, the impact of the source, load, leakage inductance, magnetizing inductance and line resistance on dc magnetic biasing is considered and analyzed. Finally simulation...
The voltage of single supercapacitor is no more than 1.6 V. So a lot of cells are combined to a bank in order to reach higher voltages which make it possible for a high efficient transformation from the supercapacitor bank. Sometimes hundreds of cells are connected whereas the voltages of the cells differ with others. So proper measure should be taken to detect the voltages of the individual cells...
The EMC design is of vital importance for electronic control modules of high power dc-dc converters to achieve high reliability of fuel cell electric vehicles. This paper focuses on the EMC design of an ARM-based electronic control unit for the high power DC/DC converter. The countermeasures are as diverse as the problems, such as grounding techniques, power lines interference rejection, PCB shielding,...
This paper presents two kinds of models, named ldquotime-domain modelsrdquo and ldquofrequency-domain modelsrdquo. The typical model of the first kind is a ldquotwo branch modelrdquo, which is very similar to many other in literature from the circuital point of view. However the process of identification of its parameters is easier and faster. While the latter one is a model using impedance spectroscopy...
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