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It is known that a dysoxic water mass threatens oyster farming in Dangdong bay. A density current generator is planned to be installed to solve this problem. In this study, we reconstructed the tide level, physical field and dysoxic water mass in Dangdong bay by using numerical simulation and comparing with field measurements and investigated the effect of density current generator by installing it...
The modeling, simulation and analysis of the energy conversion equations describing the behavior of a hybrid system PV and wind turbine, hybrid system for electrical power generation. A numerical model based on the aforementioned equations was developed, coded and results were compared to experimental data. The model is intended to be used as an optimization and design tool for such hybrid systems...
This paper analyzed the precision loss problem in calculation of EM wave propagating in extreme plasma environment. To overcome the problem, a numerical calculation with arbitrary precision is proposed. The simulation results show the effect of computational precision loss on EM wave propagation and also illustrate the validity of the arbitrary-precision calculation method.
This research is concerned with the evaluation of a liquid level model of separator in an ocean thermal energy conversion (OTEC) plant using Uehara cycle. The liquid level model is described by the polynomial of valve opening and white Gaussian process. The mean and the variance of white Gaussian process are determined by two kinds of experimental data. The behavior of the liquid level model is evaluated...
In this paper, the numerical simulations of two-layer shallow water equations (SWE) for submarine avalanches are elaborated. The numerical scheme of staggered finite volume scheme is used. The numerical results using two-layer SWE model is compared to the SWE-Exner equation model. The results are shown in a good agreement for both models. Another simulation which is simulation of submarine avalanches...
According to our previous experiment, oil flow electrification is closely related to the space charge behaviors in oil-paper insulation system under DC voltage. In this paper, we present a new numerical method to estimate the streaming current in a rectangular paper duct under DC voltage. For the simulation model, we consider the case of laminar flow in a sample of two layers of oil-impregnated-paper...
The traditional metal plate bending process is difficult to meet the requirements of modern shipbuilding industry, and this paper adopts a new incremental bending process for manufacturing metal plate based on minimum energy principle and dieless forming. This process uses a set of punches and a series of highly adjustable and head rotatable supports to complete the punching process by changing the...
Cavitation nozzle is the core component of cavitation generator. It promotes cavitation by its internal special structure, producing bubble and improving the impact force of jet. The structural characteristics directly affect the quality of the cavitation jet. Therefore, the study of internal structure of nozzle is helpful to improve the performance of nozzle. Based on CFD software, taking the Helmholtz...
A novel model of heterogeneous multiple dynamic agent systems is established, which describes the chasing process between a group of agents and their quarries. In the model, the group is modeled based on inter-individual attraction and repulsion, that is, each individual can neither move away from the whole group nor get too close to other members. Moreover, two functions are introduced to reveal...
Supportability simulation is widely used in the supportability analysis of complex products. The accuracy of the simulation results directly affects the quality of the support concept, which determines the performance of the product. In this paper, image similarity is introduced as a new criteria to the validation of complex product supportability simulation results. In the developed method, the simulation...
A mesoscale modeling investigation of tropical cyclone/hurricane forecast over the Gulf of Mexico has been established under the NASA/HBCU Renewable Energy and Technology Project to adopt the numerical weather prediction model for possible use in regions where solar equipment will be used. Accurate and reliable forecasting is crucial in regions that have limited resources where renewable solar energy...
In order to reduce the initial disturbance and improve the stability of air defense missile, the missile launching equations of motion are derived and simplified using the method of modal substitution. Based on these equations, the coupled rigid-flexible dynamic modeling is built in the ADAMS software to analyze the dynamic behavior and stability of missile launching process. The results indicate...
In this paper, the reliability of transient simulation results of uni-traveling-carrier photodiodes (UTC-PDs) is demonstrated by compared with experimental and reported simulation results, when the parameters of drift-diffusion model are set correctly.
Phased-mission system (PMS) can have a number of mission phases with different system configurations of components. In engineering practice, there exist PMSs that have phases with time redundancy, meaning that the system is required to work in operational state for only a given duration of time within such phase, instead of all the phase duration like traditional PMS. For such complex PMS, it is not...
The main goal of this paper is to manage the switching on/off of servers in a data center during time to adapt the system with incoming traffic changes to ensure a good performance and a reasonable energy consumption. In this work, the system is modeled by a queue then, an optimization algorithm is designed to manage energy consumption and quality of service in the data center. For several systems,...
This study is focused on the development and validation of a 3D CFD model capable to simulate the formation and growth of the laser track during laser polishing of H13 steel. The model incorporates several different modes of heat transfer as well as temperature-dependent material properties. The model has been experimentally validated and can be used to predict the effect of various process parameters...
The possibilities of substitution of the distributed radar object by the geometrical model, composed of two point radiators for normal distribution correlation, have been analyzed. A distribution law of coordinate noise was used for an adequacy criterion of a model. Exactly the parameters are an expected value and parameter determining a distribution width. Relations, that allow to calculate powers...
Power hardware-in-the-loop modeling (PHIL) is one of advanced approach for test automation and verification of complex circuits and systems. This approach is most well used in power networks and power-trains. PHIL modeling is supposed part of a system is software model whether the other part is hardware item under test. A special interface algorithm supports interaction between computer model and...
A standard priority-queuing system is capable of arranging packets with different traffic classes to guarantee a relatively low latency for the high priority traffic. However, in practical cases, severe delay may be caused by starting a large, low-priority frame ahead of a time-critical frame. In this paper, interspersed express traffic is evaluated, which enables preemption of non-time-critical transmission,...
The paper presents a design of SRAM circuit using CNTFET transistors. The complete model describing CNTFET, developed in Stanford University is modified for the purpose of designing a 6T (2×2) SRAM memory cell. The simulation results of the CNTFET SRAM memory cell manifest usability and applicability of the modified CNTFET model in designing digital circuits. The simplified CNTFET model is coded in...
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