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In this paper we present a higher order moment-matching algorithm for computing the distribution parameters of nonlinear transformation random variables. The new algorithm has two distinct aspects compared to the standard Unscented Kalman Filter (UKF). First, the sigma points are computed in two steps using the covariance matrix and higher-order moments. Second, the associated weights are positive...
According to the solution to transcendental equation for selective harmonic elimination inverter is difficult,a method of solution to switching angles based on the rapid expansion of cos(nα) was presented. The SHET transcendental equation has been simplified by the law of rapid expansion of cos(nα).This method enlarges the range of initial switching angles and there is no divergence or singular value...
Researching on cavitation of propeller which is an important part of ship bubble wake has important signification for studying ship bubble wake. The three viscous flow field of a five-blade high-skew propeller was simulated with numerical method. Based on RANS method, SST turbulent model and Single full cavitation model were used to simulate and analyze the cavitation characteristics of the propeller...
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