微型四旋翼位姿监测与控制实验系统设计

为掌握微型四旋翼工作原理、姿态监测、系统建模以及位姿在线控制和调试方法,设计了微型四旋翼位姿监测与控制实验系统:软件基于C#、MatLab和MDK开发,能够实现微型四旋翼姿态实时监测、系统仿真、在线调试与控制;硬件包含四旋翼本体、遥控器和调试支架,能够进行微型四旋翼桌面在线调试.依托系统设置了五大项14小项实验内容,实...     

The Impact of Learner’s Prior Knowledge on Their Use of Chemistry Computer Simulations: A Case Study

It is complicated to design a computer simulation that adapts to students with different characteristics. This study documented cases that show how college students’ prior chemistry knowledge level affected their interaction with peers and their approach to solving problems with the use of computer simulations that were designed to learn electrochemistry. Students with different prior knowledge levels were found to use different approaches to solving problems with the use of computer simulations. In particular, the cases showed that students with a high level of prior knowledge tended to use the equations and formulas to accomplish the learning tasks and then use the computer simulations to confirm their predictions. Students with a low level of prior chemistry knowledge used the computer simulations as the main resources to accomplish their tasks. Considerations of individual differences and the integration of learning materials were suggested for further research on instructional use of computer simulations.     

Numerical Simulation of Dynamic Response and Collapse for Steel Frame Structures Subjected to Blast Load

The progressive collapse of steel frame structures under the blast load was investigated using LS-DYNA. The multi-material Eulerian and Lagrangian coupling algorithm was adopted. A flu-id-structure coupling finite element model was established which consists of Lagrange element for simulating steel frame structures and concrete ground, multiple ALE element for simulating air and TNT explosive material. Numerical simulations of the blast pressure wave propagation, struc-tural dynamic responses and deformation, and progressive collapse of a five-story steel frame structure in the event of an explosion near above ground were performed. The numerical analysis showed that the Lagrangian and Eulerian coupling algorithm gave good simulations of the shock wave propagation in the mediums and blast load effects on the structure. The columns subjected to blast load may collapse by shear yielding rather than by flexural deformation. The columns and joints of steel beam to column in the front steel frame structure generated enormous plastic defor-mation subjected to intensive blast waves, and columns lost carrying capacity, subsequently lead-ing to the collapse of the whole structure. The approach coupling influence between struc-tural deformation and fluid load well simulated the progressive collapse process of structures, and provided an effective tool for analyzing the collapse mechanism of the steel frame structure under blast load.     

基于MATLAB控制系统仿真分析软件的开发与应用

介绍了在MATLAB提供的GUI(guide)工具的可视化环境下,通过采用基于对象的设计,开发了自动控制系统的计算机辅助设计与仿真分析软件.经应用验证该软件具有操作简便、界面友好、功能完善等特点,为提高控制系统性能分析与设计效率,提供了一种高效实用的仿真工具.     

基于MATLAB的智能楼宇模糊温度控制系统设计

在简要介绍模糊控制系统的基本原理,以及模糊控制器设计的原则和步骤的基础上,结合智能家居温度控制系统实例,采用MATLAB的模糊逻辑工具箱和SIMULINK,设计了一个智能家居模糊温度控制系统,仿真结果表明,该系统具有较常规的控制系统更优良的性能,可以更好地满足用户的需求.     

一种双旋翼控制系统的建模与仿真

对一种复杂的多输入多输出控制系统—双旋翼系统进行了研究。在详细、准确地进行运动学和动力学分析的基础上,建立了比较完备的双旋翼系统数学模型,并对双旋翼控制系统的姿态控制进行了初步仿真,并给出了仿真结论。     

电路仿真软件在电子技术教学实践中的应用

仿真技术使得电子线路的分析过程可以在计算机上准确、快捷地完成，一方面克服了实验室元器件和仪器方面的限制，另一方面也突破了时间和空间的限制。该文阐述了电路仿真软件在电子技术课程教学、实验教学以及课程设计中的应用。     

基于虚拟现实技术的变电站三维场景仿真技术

介绍了变电站的三维场景建模方法,采用虚拟现实建模语言(VRML)建立了三维虚拟电气设备及虚拟变电站,并且通过VRML的Script节点调用Java程序实现了交互功能。应用三维图形技术为变电站仿真系统构造虚拟环境能大大提高变电站场景的真实感,同时,将电力系统仿真软件与虚拟变电站连接起来模拟变电站的各种运行状态,为变电站仿真培训工作带来技术飞跃。该系统不仅具有三维显示、实时交互及动态仿真等特点,还可以在PC机和Windows操作系统环境下运行,因此具有经济、高效、便于使用等优点。     

Experimental study and numerical simulation of the sludge concentration in a sedimentation tank

Sedimentation tanks and clarifiers play a significant role in an active sludge system, and the efficiency of the whole system is closely related with the design and operation of the sedimentation tanks. This paper focuses on the sludge concentration in each cross-section of the sedimentation tank. We measured the sludge concentration to explore its distribution inside the tank, carried in-situ tests to research the fluid pattern and real operational rules of the sedimentation tank. We also used the computational fluid dynamics (CFD) software, PHOENICS 3.5, to simulate the solid-liquid two-phase fluid inside the tank and describe the sludge concentration distribution. The numerical results indicate obviously a sludge-water interface and a compression interface inside the sedimentation tank, a stratified sedimentary region with uniform concentration and a compression region with high concentration at the bottom of the tank. Although the simulated concentrations deviated slightly from those of in-situ tests, they were still acceptable for identifying the sludge interfaces and fluid pattern inside a sedimentation tank, which are important parameters for optimizing the tank size and improving the settling efficiency.     

数控仿真系统在数控教学中的应用

随着科学技术的迅猛发展,数控加工在机械制造业中占有着越来越重要的地位。本文结合我院近几年使用数控仿真软件教学的实践,对数控仿真教学系统的应用形式及功用等进行介绍。