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In order to avoid effects of the variation of stator resistance and error caused by integral computation in the traditional speed-sensorless vector control, a reactive power-based sensorless control strategy for the five-phase induction motors(IM) with non-sinusoidal power supply is investigated. The proposed method uses instantaneous and steady-state reactive power value as the reference model and...
The effect of stanchion and reverse flow on turbine power performance is studied based on Computational Fluid Dynamics (CFD). The turbine in this paper is developed by National Ocean Technology Center (NOTC), the experiment study has been carried out in year 2014. The simulation model is validated based on experimental results. The CFD model can simulate the marine current conditions up to an acceptable...
Nearshore wave model was established based on the enhanced Boussinesq equations, which were dispersed into orthogonal grids on spatial distribution and solved using alternating direction implicit (ADI) algorithm. There are three kind of boundary conditions which are absorbing boundary, reflecting boundary and wave-generating boundary in the model, while the wave on open boundary was driven by the...
The first and a crucial step in development of tidal current power is to make a comprehensive assessment at potential sites. In order to obtain the features of tidal current and properly site tidal current energy converter, the Regional Ocean Modeling System (ROMS) was employed to simulate tidal current in this region. Favorable comparison with the previous research indicates that this model has essential...
In this paper, the stability experiment of the electricity market simulation adopted agent-based computational economics(ACE) is carried out under different congestion degree on the platform of electricity market simulation system and laid the experiment foundation for the research of electricity market network congestion simulation. It can be seen from the experiment results analysis that the presence...
In order to implement message processing flexibility, easy scalability and fault tolerance, it created a general model that dynamically parsed the transaction message. Firstly, it offered a general definition for message (as definition 2), message field (as definition 1), and the relation between them (as definition 3 and 4), secondly, it described the key objects of model and the relational model...
In complex urban traffic conditions, occlusion between vehicles is a common problem which is challenging to current vehicle detection methods. In this paper, we have proposed a vehicle detection method based on a part-based model which can deal with the occlusion problem. Our method includes two steps: constructing the part-based model and detecting vehicles from traffic images. In the first step,...
To handle the pedestrian appearance and pose variations in complex traffic environments, we present one part-based pedestrian detection approach using a stochastic grammar model in this paper. The And-Or graph model is introduced to represent the human body as an assembly of compositional and reconfigurable parts. Thus, the task of detection is converted into the human parsing problem, which is a...
For body sensor networks (BSN) nodes, extending battery lifetime is one of the key problems. In this paper, we address the problems of designing battery-friendly packet transmission policies in order to maximize the lifetime of batteries for BSN nodes under certain delay and deadline constraints. We present local optimization scheme for slack time and evaluate it with respect to battery performance...
This paper constructed a colored time Petri net model with inhibitor arcs for the data control and transmission in inkjet printing system. The Petri net is based on the basic and some extended Petri nets, combining with the characteristic of control system. Through establishing the Petri net model for the traditional inkjet printing system, analyzing the bottleneck of the data transmission speed,...
This paper is concerned with the theory and method of information retrieval for solving mass literature retrieval. The corresponding retrieval method for mass literature with the feature of huge capacity, rapid responding time limit is designed and the implementing process and relating algorithm is illustrated as well.
In order to realize real-time interactive functions of multi-client in virtual reality, a distributed vehicle dynamic simulation system based on multi-client interactive module is designed in Virtools virtual reality editing environment. In the system, session of multi-client and remote distributed vehicle objects is established to implement real-time interactive function. Experiment result shows...
How to verification and validation conceptual model (called CM for short) under the concrete descriptive way is the foundation of simulation development and reliability evaluation. This paper introduces related problems of CM V&V (verification and validation) briefly, analyzes the V&V process and matter of CM based UML description, studies V&V techniques for dynamic behavior in the UML...
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