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Among numerous theory models for describing the parametric array's near-field acoustic characteristics, the KZK equation is the most accurate theoretical model. However, the computation efficiency is low by using the frequency-domain method for the parametric array's sound field. The paper drew ideas from the time-domain method to separate the operator, and calculated the KZK equation's nonlinear...
The parametric array can generate low-frequency, high-directivity beam with small-aperture, and it is widely used in underwater navigation, underwater communication, seafloor sediments detection, sub-bottom physiognomy surveying and mapping. However, the parametric array's conversion efficiency is very low, severely restricting the parametric array's further application. In order to improve the parametric...
The steelmaking-continuous casting (SCC) process, which consists of steelmaking, refining and continuous casting stage, is usually the critical process in iron and steel industry. This paper aims to propose a simulation method for the realistic hybrid flow shop scheduling problem resulting from the SCC process. A mathematic model based on a comprehensive investigation is built first. Then, a simulation...
In this article, the high precision control problem of relative motion for satellite proximity operations is considered. First, attitude and orbit coupled dynamic models are established. Then, by choosing proper sliding mode surface, a novel sliding mode attitude controller is proposed, which is robust to disturbing torque brought by thrust misalignment and can guarantee attitude tracking errors converge...
The magnetic shielding efficiency at 50 Hz of rooms with windows and doors is studied in this paper. The equation of the curl of magnetic vector potential is implemented through the finite element method to find the magnetic shielding efficiency. The entire analysis has been done in two dimensions. The shielding rooms with different sizes and windows openings are compared. The effects of thickness,...
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