To diagnose the arc erosion type and improve arc erosion resistance of Ag/LSCO (Ag/La0.5Sr0.5CoO3-δ) contacts, making and breaking experiments were carried on Ag/LSCO(12) contacts prepared by both traditional powder metallurgy method and a modified one in this work. Arc erosion and morphological characters of this two kinds of Ag/LSCO(12) samples were investigated and the erosion mechanisms were also discussed. The results are that seven types of arc erosion morphologies of Ag/LSCO(12) contacts were classified as the lump region, the cauliflower region, the framework structure, holes and cavities, cracks, spongy region and the vestiges of fusant spreading. There are intrinsic links between these morphological characters. The spongy regions and vestiges of fusant spreading on the contact surface of Ag/LSCO(12) prepared by the new method indicates that its resistance to arc erosion is superior to the contacts prepared by traditional method.
A nonlinear model for the marine high-voltage transformer is established which based on the J-A theory , considered the eddy current loss. This model accurately reflects the nonlinear characteristics of the transformer, and does well in describing the dynamic process, it is propitious to design the ship transformer and the study of relay protection. A fourth-order Runge-Kutta algorithm is used to solve the nonlinear differential equations to ensure the model has a high accuracy, and the pre-magnetizing model is also established. At last, through the transformer no-load closing simulation results verified the correctness of the model.
The mathematical model of the ship autopilot system is established which centering on marine hydraulic steering gear, based on the Nomoto ship motion model, and considered the influence of wind, wave, flow and other environmental factors on ship course angle. Depend on this model, the physical-digital hybrid simulation autopilot simulator is developed. This simulator has all of the operating functions of the ship steering system, it can not only simulate the turbine engine working scenarios, but also dynamically display the operation process, and the simulator is applicable to the ship track control research and crew training work.
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