Advances in Mechanics Engineering

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Authors: Feng Ju Hu, Ji Xin Liu, Na Wang
Abstract: This paper mainly introduces the methods and advantages of creating three-dimensional entity by the user coordinate system (UCS). The example of the operation details the operation method and skill of the UCS entity . This makes the creation process of the 3D entity clear, simple, and quick.
Authors: Jie Zhang, Hong Yun Chen, Ye Wen Gao
Abstract: Computer simulations, such as PC-CRASH, were used in this paper to develop simulation model of car-bicycle/bicyclist crash. The change law of throw ditance which belongs to the first falling point and final falling point of bicyclist were studied on. Through researching the parameters obtained in the process of computer simulation, we concluded the stress size on the important part such as head, chest and knee of bicyclist in different accident modality. This research result provides a good idea in car-bicycle/bicyclist crash reconstruction.
Authors: Bai Gang Sun, Hui Yang, Yong Bo Liu, Xiang Bin Liu, Feng Li, Jing Yu Wang, Yan Dong Mu
Abstract: At present, NASA is engaged in research to develop Plasma flow control technology on aeronautic and astronautic scopes. This article presents a compositive MHD(magnetohydrodynamics) method to control high-velocity Plasma flow generate by alkali salts in combustion gas, demonstrates that MHD system can make the jet plume to deflect, and realizes the aeroengine thrust-vector purpose. By analyzing and applying the MHD mathematical model, the author performs the numerical simulation of plasma flows-field with the MHD condition,shows that the jet plume in plasma state can deflect with MHD.
Authors: Qin Jiang, Chang Kuan Zhang
Abstract: A numerical wave flume (CADMAS-SURF/2D) developed on the basis of NASA-VOF technique is used to simulate interactions between waves and maritime structures in order to verify its feasibility to maritime structure designs. Examinations and comparisons of the calculated results of wave impacts on typical maritime structures, such as caisson-type and composite breakwaters, with experimental data indicate that the numerical wave flume can be an effective computer aided design tool for the designs of coastal protection structures.
Authors: Gui Hua Li, Jian Guo Feng, Nian Tian Lin, Gui Liang Li, Min Guo
Abstract: A key issue in the wave equation simulation of seismic records is the boundary conditions. Due to computer memory and computation and other restrictions, can only be solved on a limited area, which will cause the introduction of an artificial reflector. So as to simulation of seismic wave propagation in an infinite medium, the boundary conditions must be constructed so that the interface of the reflection as little as possible. In 2.5D VTI media feature analysis absorbing boundary of higher order velocity-stress staggered-grid finite difference method are established. The mixed boundary of the feature analysis absorbing boundary plus damping attenuation condition is used in 2.5 D VTI numerical simulations, simulation results show that this method is an efficient absorption and attenuation boundary conditions.
Authors: Zhan Feng Song, Qiang Geng
Abstract: To study the structural loads of wind turbines under grid faults, this paper introduces the concept of co-simulation in the load characteristics analysis of wind turbines under voltage dips and a complete model including both mechanical and electrical parts is constructed. A combination of different simulation packages is used to model the electrical and mechanical aspects of a wind turbine respectively. To demonstrate the co-simulation modeling method can be applied to analyze wind turbine structures, a reference model based on the industry-accepted wind turbine analysis code is also established. A side-by-side comparison of response predictions is further performed between co-simulation strategy and industry-accepted wind turbine analysis code.
Authors: Ling Zheng, Chao Ran Yang, Lei Yang Cheng
Abstract: At present, along with the development of power information technology, the research of visualization of the equipment status has become the main work. This paper analyzes the existing equipment visualization system and finds that equipments are displayed by two-dimensional graphics, and cannot give a really reflection of the surrounding environment. In order to solve this problem, this paper proposes a solution which uses three dimensional panoramic technologies in electrical equipment visualization system. The scheme realizes virtual scene construction which is based on static images; consequently it will be more convenient for visual management of electrical equipment.
Authors: Yu Cai Dong, Zhong Hua Du, Rong Zhong Liu, Jie Liu
Abstract: In order to further enhance the penetration merit, the extended structure has been improved and optimized. In this paper, the LS-DYNA code was employed for normal incidence simulation on several extended structures of the same mass. Target material is RHA603 at the speed between 1.47km/s to 1.77km/s. The numerical simulation results show that on the basis of the general extended penetrator of the merit was further improved by add connector structure. While at the speed of 1.57 km/s, transverse reflux was formed by the erosion of material in the course of its penetration. This greatly reduces the penetration efficiency. Then by the addition of plug,it makes the merit of extended penetrator greater stability and efficiency, the maximum merit was up to 18.1%.
Authors: Zhi Yuan Cai, Hong Yuan Ai
Abstract: An intelligent controller with capable communication for control and protective switching device (CPS) based on Profibus fieldbus was designed. The system with the single chip microcomputer as the core realized the function of measuring, protection, controlling and communication between CPS and host computer by Profibus fieldbus. The design could not only realize real-time monitoring for running state of multiple electromotor but also set the protection parameters of CPS and alarm function online by interface, which made CPS have remote monitoring function.
Authors: Ju Ming Yuan, Jiang Yun Shou, Lei Ming Zha
Abstract: This paper presents a controller design based on PIC24 single chip microcomputer, applied to a small independent wind-solar hybrid power generation system. The system’s characteristics are analyzed and the complementary charging algorithm for the battery is studied. The PIC24MCU’s internal resources are made full use of in the controller design, especially the multiplex PWM output and A / D input, thus the hardware circuit is simplified. The controller can not only realize the hybrid of wind generator and solar cell for charging the storage complementary, but also provide a constant current control function for the DC load.

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