Analysis and modeling of novel brushless exciter based on hybrid excitation topology
The exciter is a key component of the synchronous generator system with self-excited initiation. Based on the topology of hybrid excitation, this paper proposes a novel brushless exciter, which is suitable for an isolated power system. The parameters of the exciter are calculated by the numerical method based on finite element model, and the state space model is established. The experimental researches are carried out on a 3 kW prototype.
A survey of the second-generation vessel integrated power system
The vessel integrated power system (IPS) is the third revolution in the naval vessel power which has evolved from wind power to steam power and then from steam power to nuclear power, marking the trend of naval vessel power. The first-generation IPS has been widely applied to engineering in many countries. However, there are some defects in it such as huge volume, heavy weight and low compatibility when the first-generation IPS is used in light ships, because its power density is limited by the properties of the electromagnetic materials, power electronics, etc. This paper has presented the concept and typical architecture of the second-generation IPS and its technical advantages, introduced several key technologies concerning the second-generation IPS that need a breakthrough according to the current technical level, and pointed out direction of the research and engineering application of the second-generation IPS.
Laminar heat or mass transfer in rectangular channels and in cylindrical tubes for fully developed flow: comparison of solutions obtained for various boundary conditions
Abstract A comparison is made of results obtained with various boundary conditions at the wall of the channels. By comparing blood Sherwood numbers for finite wall resistance with those for constant concentration boundary condition only a small variation is found for various points along the blood channel.