To provide a simulation system platform for designing and debugging a small autonomous underwater vehicle＇s （AUV） motion controller, a six-degree of freedom （6-DOF） dynamic model for AUV controlled by thruster an...To provide a simulation system platform for designing and debugging a small autonomous underwater vehicle＇s （AUV） motion controller, a six-degree of freedom （6-DOF） dynamic model for AUV controlled by thruster and fins with appendages is examined. Based on the dynamic model, a simulation system for the AUV＇s motion is established. The different kinds of typical motions are simulated to analyze the motion performance and the maneuverability of the AUV. In order to evaluate the influences of appendages on the motion performance of the AUV, simulations of the AUV with and without appendages are performed and compared. The results demonstrate the AUV has good maneuverability with and without appendages.展开更多
The system dynamics is a new subject that was put forward by Professor J W. Fortester in dmerican MIT in 1950s. It is extensively applied to systematic problems af high phase, nonlinear, multtdimensionality, multiple ...The system dynamics is a new subject that was put forward by Professor J W. Fortester in dmerican MIT in 1950s. It is extensively applied to systematic problems af high phase, nonlinear, multtdimensionality, multiple feedback and complicated time-variation. In this paper, the complex system in mining area is divided into five parts - resources, environment. economy, population, and science and technology. The.five parts are regarded as five sub-models. By taking the economic subsystem as an example, the SD model of complex system in mining area is established. This model has certain universality and practicability.展开更多
In this work, the separation of carbon dioxide （CO2） from （PSA） column was modeled and simulated. The adsorption kinetics the methane （CH4） using fixed bed Pressure Swing Adsorption on the 13X zeolite adsorbent ...In this work, the separation of carbon dioxide （CO2） from （PSA） column was modeled and simulated. The adsorption kinetics the methane （CH4） using fixed bed Pressure Swing Adsorption on the 13X zeolite adsorbent was described by Linear Driving Force （LDF） model. Simulation of adsorption phenomena inside the fixed bed was implemented using Computational Fluid Dynamic （CFD） method, based on porous media concept, and the mass transfer coefficients for gas components （COz and CH4） were developed using User Defined Scalars （UDS）. The model was validated by comparing with the experimental data, which were collected based on a varied set of laboratory conditions. The prediction of the adsorption isotherm （uptake curve） and methane recovery using the simulation results exhibited a reasonable agreement with the experimental data. Moreover, the effects of feed flow rate and bed concentration evolution were investigated. The current results suggested that CFD approach is capable to predicate the hydrodynamics and adsorption phenomena in the fixed bed adsorption column.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.50909025
文摘To provide a simulation system platform for designing and debugging a small autonomous underwater vehicle＇s （AUV） motion controller, a six-degree of freedom （6-DOF） dynamic model for AUV controlled by thruster and fins with appendages is examined. Based on the dynamic model, a simulation system for the AUV＇s motion is established. The different kinds of typical motions are simulated to analyze the motion performance and the maneuverability of the AUV. In order to evaluate the influences of appendages on the motion performance of the AUV, simulations of the AUV with and without appendages are performed and compared. The results demonstrate the AUV has good maneuverability with and without appendages.
基金Supported by the National Natural Science Foundation of China (No. 70173034).
文摘The system dynamics is a new subject that was put forward by Professor J W. Fortester in dmerican MIT in 1950s. It is extensively applied to systematic problems af high phase, nonlinear, multtdimensionality, multiple feedback and complicated time-variation. In this paper, the complex system in mining area is divided into five parts - resources, environment. economy, population, and science and technology. The.five parts are regarded as five sub-models. By taking the economic subsystem as an example, the SD model of complex system in mining area is established. This model has certain universality and practicability.
文摘In this work, the separation of carbon dioxide （CO2） from （PSA） column was modeled and simulated. The adsorption kinetics the methane （CH4） using fixed bed Pressure Swing Adsorption on the 13X zeolite adsorbent was described by Linear Driving Force （LDF） model. Simulation of adsorption phenomena inside the fixed bed was implemented using Computational Fluid Dynamic （CFD） method, based on porous media concept, and the mass transfer coefficients for gas components （COz and CH4） were developed using User Defined Scalars （UDS）. The model was validated by comparing with the experimental data, which were collected based on a varied set of laboratory conditions. The prediction of the adsorption isotherm （uptake curve） and methane recovery using the simulation results exhibited a reasonable agreement with the experimental data. Moreover, the effects of feed flow rate and bed concentration evolution were investigated. The current results suggested that CFD approach is capable to predicate the hydrodynamics and adsorption phenomena in the fixed bed adsorption column.
