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EMAT is an emerging non-destructive testing technique which has been applied to the pipelines monitoring. It has advantages of non coupling agent and can be used in high temperature, high accuracy as well as wide range detection. High energy consumption and low conversion efficiency are two main challenges for NDT by using EMAT. This paper proposes a new pipeline electromagnetic ultrasonic excitation...
One of the most common gear damages is contact fatigue damage, which is difficult to be detected at an early stage. As one of the integrative non-destructive testing and evaluation techniques (NDTE) of eddy current and thermography, eddy current pulsed thermography (ECPT) has been applied for fatigue damage characterization. However, quantitative material state characterization before microcrack initiation...
Eddy Current Pulsed Thermography (ECPT) is an integrative Non-Destructive Testing and Evaluation (NDT&E) technique that has been applied for defect and material characterization of conductive material and components. Thermal transient images provide rich information for decision making. However, high sampling rates of a thermal camera creates high cost and will generate a large of amount of data...
This paper proposes a control strategy which is combined with a novel decoupling control and negative sequence correction strategies. Firstly, based on superimpose theory, the coupled relationship between three-phase output voltage and three-phase sinusoidal pulse width modulation (SPWM)control wave is deduced. Secondly, according to symmetrical component decomposing theorem, mathematical expressions...
As widely-used energy transform device, inverter plays important role in microgrids and distribution generation (DG). Generally, according to its control object, inverter's controllers can be classified into at least three kinds: constant PQ, droop control and synchronverter (SV) or virtual synchronous generator (VSG). In this paper, an improved synchronverter model is presented. By means of powerful...
Compared with fossil fuel vehicles, plug-in hybrid electric vehicles (PHEVs) and electric vehicles (EVs) maintain obvious and profound significance for the less city pollutant and operation noise. Moreover, EVs can benefit operation of the power systems via friendly feeding back the energy stored in the EV batteries into the grids when needed. The related research about charging of batteries for EVs...
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