Papers by Keyword: Dynamic Simulation

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Authors: Jun Hong, Li Guo, Ling Qiao, Xiao Ming Guo
Abstract: Since meso-structure of plain concrete can not be observed directly, numerical simulation is the main approach to obtain the model coincident with the real structure on statistics. By applying the discrete element method, we have developed the 3D dynamic simulation for random aggregate model of plain concrete. According to the real ration of mass, the spatial positions of aggregate have been obtained, which is more close-grained compared with the random-distributed models based on Monte Carlo method. Compared with the geometrical generating algorithm for 2D random polyhedral aggregate, the algorithm for 2D or 3D random polyhedral aggregate is simpler. The results are the foundation for further studying the interface fracture and chloride diffused channels.
Authors: Yong Chen, He Zhang, Shao Jie Ma
Abstract: The external turbine can be used on underwater high-speed moving body to measure its own velocity. By establishing the rotating turbine dynamic equations and using UDF programming for secondary development on fluent software, the three-dimensional dynamic simulation of water speed measurement turbine model was achieved. Using this model, under the complex flow environment like cavitation and small attack angle, the dynamics simulation was performed and the results was analyzed to get the turbine movement characteristics. Simulation results show that the simulation model can reflect the variation in characteristics of the turbine caused by the small attack angle at cavitation situation.
Authors: Shao Hua Li, Yang Song, Tie Ying Wang
Abstract: With the rapid development of the power industry, there has been more and more large thermal power unit which is more than or equal to 600MW , steam turbine equipment gradually tend to be high parameter, large capacity, complicated, the overhaul maintenance to steam turbine is the main content of the power plant production activities, it directly affects the reliability of the coal-fired power plant production safety. Aimed at the complexity of thermal steam turbine overhaul, by the use of advanced interactive devices on the visual, do an auditory perception of the virtual environment for something, which is helpful to improve practical operation skills. This paper examines the necessity and superiority of this system applied in education and training. Taking 3-D dynamic simulation system of building as an example, this paper discussed how to utilize the SolidWorks2012 and VRP - SDK to build a virtual training system, realized the combination with virtual reality and education training ,also greatly promoted science and technology progress,equipment of the steam turbine overhaul industry.
Authors: Lei Li, Xian Ying Feng, Zi Ping Zhang, Xing Chang Han, Ya Qing Song
Abstract: This paper presents 3D modeling and simulation for a new type of globoidal indexing cam mechanism with steel ball. The characteristic of this mechanism is that cam raceway section is double circular arc section, and this characteristic is helpful to realize approximate rolling transmission. Profile surface equation of globoidal cam is established according to rotary transform tensor theory and meshing theory. Coordinate points of profile surface is obtained by MATLAB software. 3D model of parts of globoidal indexing cam mechanism with steel ball is built by Pro/E software. In Pro/E software these parts are assembled, and kinematics simulation is performed. Through kinematics simulation angular displacement, angular velocity and angular acceleration of indexing plate are obtained. Finally dynamic simulation of this mechanism is performed by ADMAS software, and contact force between cam and roller is obtained.
Authors: Hui Ping Zheng, Min Xue, Yan Zhao, Xin Yuan Liu, Yu Han
Abstract: In order to overcome the shortcomings of the present accuracy assessment methods of power system dynamic simulation, this paper focuses the permanent single phase short-circuit fault which occurs in a large probability in power grids,and selects the typical electrical quantities which is very concerned in engineering after the fault happened. A time-scale based error criteria on simulation validation is proposed, and a comprehensive error criteria according to the average errors between simulation data and actual data is proposed to evaluate objectively the simulation accuracy of the typical electrical quantities. Considering the variation characteristics of the electrical quantities, the simulation accuracy evaluation of a single electrical element is expended to the simulation accuracy evaluation of the entire network, so not only the comprehensive evaluation about the model and its parameters but also the information for model modification and parameter correction can be obtained. The effectiveness of the proposed method is verified by the numerical results on the New England 10 Unit 39 Bus powers system.
Authors: Mao Hsiung Chiang, Ching Sung Wang, Chin Cheng Huang, Wei Nian Su, Tsung Chih Tung
Abstract: The use of wind power has been rising up rapidly due to its power potential and the improvement of technology. In order to extend the max capacity of power output, the size of wind turbine should grow simultaneously. Therefore, a cost effectiveness of wind power plant is needed to improve the performance. This paper aims at designing a novel hydraulic pitch actuator to implement pitch control effectively even if an impulsive wind peak appears. By developing a novel hydraulic pump control system, the creative design of hydraulic pump control system comprising a fixed displacement pump driven by a servo motor, two unsymmetrical hydraulic cylinders, and hydraulic circuits, could have an excellent response in operation. Furthermore, a feedback linearization controller was designed to compensate for the nonlinearity of hydraulic system and overcome the impulsive loadings from wind peaks. The turbine model was built through FAST released by NREL and the dynamic performance showed the excellent robustness and response with that proposed controller and mechanical design.
Authors: Zhang Ping You
Abstract: As servo-control system becomes more and more complicated, traditional simulation method can't meet the increasing demand for servo-control system, an dynamic simulation approach for servo-control system is introduced With Simulink software platform. Taking an mechanical hydraulic servo-control system as sample, the mathematical model for the system is established by standard procedures firstly. Then the simulation model of this servo-control system are constructed with block diagram module in Simulink. Finally, dynamic simulation test are performed to validate the effectiveness of the method with simple operation of the software. The simulation results shows that the dynamic simulation approach with Simulink is an effective and convenient way to research the dynamical characteristics for servo-control system.
Authors: Qun Feng Cui
Abstract: This paper completed the virtual prototype design for a ladder fire truck in ADAMS.After add the joints and motion functions,a dynamic simulation and analysis to the virtual prototype had been carried out.It approved the ladder fire truck could achieve the intended motion with comparatively steady space.The simulation provided a theoretical basis for the further design,which is a reference for the next imporving design.
Authors: Jin Li Xu, Peng Wei, Feng Yun Huang, Hong Jun Wang
Abstract: Based on UG and Automatic Dynamic Analysis of Mechanical System (ADAMS), the 3D model of differential was constructed and the real-time dynamic simulation of differential was achieved. The effects of gear backlash between half axle gears and planetary gears on the vibration of differential are studied. To increase the credibility of simulation results , the contact forces between half axle gears and planetary gears were calculated based on the Hertz elasticity impact theory.
Authors: Chang Li, Xing Han, Chun Yu Wei, Guang Bing Zhao
Abstract: It proposes an efficient method for kinemics analysis of PUMA560 robot in ADAMS/View in this paper. Comparing with the past, it builds a virtual model of the robot in ADAMS/View. By the way of dynamic simulation, the normal solutions and inverse solutions of the PUMA560 robot are obtained, and this can provide a good study basis for the operability degree and space locus analysis of this kind of mechanics. In addition, a parameterized virtual model of the robot can be build by the ADAMS secondary development technology (APDL), which can accomplish multiple dynamics analysis of the similar kind of mechanics and provide a reliable method for analyzing the effects of mechanical random errors on its motion. This new method needs not to build complex analogue to solve the mechanic, conveniently, shortcut and accurately, and have definite theory meaning and application value in dynamic analysis.
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