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This paper discusses the performance model for practical computational fluid dynamics (CFD) simulation. Based on the analysis of the conventional qualitative model and empirical knowledge in the simulation, a set of practical models for the linear solution in high-order finite element method (FEM) simulation are established: a linear function model for the storage consumption, and a power function...
In this study, the feedback controllers were designed and implemented to fulfill the constant-voltage (CV) and constant-current (CC) output modes for a power converter. This converter's power stage was composed of a stand-by power, power factor corrector, and DC-DC converter. The topology used by the DC-DC converter was a phase-shifted full-bridge with a parallel current-doubler rectification converter...
In this study, the feedback controllers for a power converter were designed and implemented to fulfill the constant-voltage (CV) and constant-current (CC) output modes. The topology used by the DC-DC converter was a phase-shifted full-bridge with a parallel current-doubler rectification converter (PSFB-PCDRC). In order to design the feedback controllers for the PSFB-PCDRC CV and CC operations, the...
A power converter supplying kilo-watt-power from its output side is developed in this paper. The composition of its power-stage includes an AC-DC converter and a DC-DC converter. The topology used by the DC-DC converter is the phase-shifted full-bridge with parallel current-doubler rectification converter (PSFB-PCDRC). For the sake of feedback controller design, the small-signal model of PSFB-PCDRC...
Rural labor force transfer plays a very important role in narrowing urban-rural income gap and promoting regional economic growth, and analyzing and exploring constraints influencing rural labor force transfer is the key in realizing smooth and reasonable surplus rural labor force transfer. On the basis of new economic migration theory, this thesis tries to quantitatively analyze factors influencing...
In this paper analysis the error of meteorological UAV Pitot-static tube wind model, meteorological UAV source of error in measuring the wind model is divided into: airspeed error, ground speed error, structural error, motion state error and angle error of five parts, using error analysis and simulation to research the sensitivity of each error, to improve a good basis for the accuracy of meteorological...
Cost issues have been an important concern in the development of Personal Rapid Transit (PRT) since the concept was developed several decades ago. The lightweight, computer-guided electric vehicles operating the PRT system are generally a major part of the capital cost of the system, especially in larger network with high demand. A sufficient number of empty vehicles are needed to be moved to the...
Demand modeling for a newly built transit system is a major issue for the feasibility study. The complexity for such demand modeling stems from the complicated multi-modal trip making by travelers. This paper proposes to build an innovative transit system PRT in the east port area of Rotterdam to improve the efficiency of the existing public transport services and to enhance the accessibility to this...
Modular design is a dynamic process and obtains rational architecture of product family continuously. It needs modeling technology to prepare skeleton for evolution of product system, and adapt to the dynamic characteristic. In this paper, a joint modeling technique is proposed to prepare for evolution of product system, which considers design process as one part of the product system. According to...
Vias can introduce impedance discontinuity, slow down signal edge rate, add jitter and reduce eye openings, and cause data misinterpretation by the receiver in high-speed channel. This paper presents the design and optimization of differential vias for high-speed serial ATA connection at the data rate of 6 Gb/s. First, differential vias on a specific stackup were modeled in the 3D full-wave solver...
Application of Simulation Science and Technology discipline is very wide and effective. During this process, it formed its common theory and method, which has representative characteristics of this discipline. Paper concludes these characteristics, explains and cards correlative theory, which include the principle and method of simulation experimentation design, the principle and method of simulation...
With the rapid development of the high power microwave source, the power levels have steadily increased. The breakdown of the feed output window is often found in the reflector antennas system. It seriously affects the service life and radiation efficiency of the feed. The paper analyzes the relationship between the max electric intensity in near-field and the field distribution on the aperture. Based...
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