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In this paper we propose an approach for the determination of static force characteristic of a plunger-type AC electromagnet using 2D numerical model developed in QuickField software. The attraction electromagnetic force is calculated using Maxwell stress tensor method. The numerical model is an AC magnetics problem coupled with the coil electric circuit. The numerical model has been experimentally...
This article introduces a new wind turbine, called resistance type vertical axial wind turbine (VAWT) with soft blades. The blades of the new turbine resist the wind and collect the power along the wind direction, while canceled the resistance against the wind direction. The new work mechanism was conceived to improve the aerodynamic performances of traditional VAWT. To prove the above supposing,...
Optimization is a procedure of finding an optimal solution from the feasible search space. In single-objective optimization, the solution gets improved iteratively based on the objective function value. But, most of the real-world problems involve more than one objective. In such situation, many solutions are optimal which are known as Pareto-optimal solutions. In this paper, we aim to solve one real-world...
The high-speed electromagnetic (EM) rail launcher has a wide range of applications. An inductive shunt device is usually paralleled with the rails of the launcher as an approach to limit the muzzle arc by transferring the extremely high armature current. The shunt parameters will significantly influence the rail current, armature velocity, and device stress conditions, which also makes the physical...
It is of great significance for the research of wind load in energy saving and emission reduction as wind load is one part of the ship total loads. An inland cruise ship is chosen as a research object, the wind loads on the ship including longitudinal and transverse forces and the yaw moment are calculated in wind angle of 0–180° by using CFD method, and then the numerical result is compared with...
Methodology and results are presented for numerical simulations and field experiments using point absorption ocean wave energy harvesting buoy systems, using the heave motion of the buoys to produce useful electrical power. Two approaches, a direct-drive system and a resonant-drive system are analyzed. These systems are not designed for large scale grid power applications, but rather for relatively...
Future planetary rovers are expected to probe over steep sandy slopes, such as crater rims, where wheel slippage can be a critical issue. One solution to this issue is to mount redundant actuators on the locomotion mechanisms of the rovers such that they can actively reconfigurate themselves to adapt to the driven terrain. In this study, we propose a mechanical model of a rover based on a wheel-soil...
The aim of the paper is to review the international development of the research on the hydrodynamic performance of rowing. The resistance of the shell can be split into three components, skin drag, form drag and wave resistance. The review analyzes the usual method of calculating the three drags in research on hydrodynamic performance of the shell and in optimization of the shape of the shell. The...
Based on the particle flow code and PFC program, this paper simulates the driving course of a jacked pile, analyses the variation of pile tip resistance with driving speed for three kinds of piles which are the flat pile, 120° tapered pile and 60° tapered pile, and analyses the varing curves of pile lateral friction with different driving depth. Further more, there are some preliminary conclusions...
Mini-Automatic Underwater Vehicle (mini-AUV), by the virtue of its advantages, has a promising future in the fields such as ocean science research, military application and commercial market. The research on mini-AUV hydrodynamic performance is the base of analysing the maneuverability and control method when the mini-AUV was working in complex oceanic environment also is the research focus. The hydrodynamic...
The constraint force generated by process conditions, such as drawbead resistance and boundary friction are generally considered as positive force in dynamic explicit finite element method, which actually are not in accord with realistic effect. A constraint disposal method for constraint force in sheet metal forming simulation was proposed using linear spring element to build more accurate numerical...
Axial force in CWR plays an important role in studying the forming quality of asymmetric shaft-parts, section shrinkage of rolled part and rolling of heavy area reduction. This paper proves that calculating axial force by FEM has favorable reliability and versatility; by using ANSYS/LS-DYNA FE software, a certain number of axial forces have been obtained successfully and the formula of axial force...
This paper proposes a practical method to identify the parameters in the train motion model. Focusing on the repeatability of the train motion system, the new method develops an iterative learning identifier to estimate the parameters through repetitive trials. With rigorous analysis, it is shown that each parameter can effectively converge to its actual point after enough iteration. At last, the...
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