口腔仿真模拟系统及其在临床前教学中的应用

介绍口腔仿真模拟系统的主要构成以及功能特点。在口腔临床前教学中应用此系统不但能够增强学生的学习积极性、巩固基础理论知识,而且能够提高临床操作技能,值得进一步在口腔教学中推广应用。     

Numerical investigation of cavitating flow behind the cone of a poppet valve in water hydraulic system

Computational Fluid Dynamics (CFD) simulations of cavitating flow through water hydraulic poppet valves were performed using advanced RNGk-epsilon turbulence model. The flow was turbulent, incompressible and unsteady, for Reynolds numbers greater than 43000. The working fluid was water, and the structure of the valve was simplified as a two dimensional axisymmetric geometrical model. Flow field visualization was numerically achieved. The effects of inlet velocity, outlet pressure, opening size as well as poppet angle on cavitation intensity in the poppet valve were numerically investigated. Experimental flow visualization was conducted to capture cavitation images near the orifice in the poppet valve with 30° poppet angle using high speed video camera. The binary cavitating flow field distribution obtained from digital processing of the original cavitation image showed a good agreement with the numerical result. Project supported by the National Natural Science Foundation of China (No. 59835160) and Scientific Research Foundation for Returned Overseas Chinese Scholars, State Education Ministry of China (No. 50175097)     

能源动力仿真实验教学系统设计与应用

简要介绍了清华大学热能工程系建立的能源动力仿真实验教学系统，以及该系统在学生实践教学环节的作用。以仿真实验系统为媒介的教学实践环节，不仅帮助学生了解了实际工程知识和动手操作能力，而且还极大地促进了学生对专业的了解和热爱，培养了团队协作精神，对学生综合素质的培养和学习理论课知识起到了重要作用。     

塑料异型材挤出成型模具建模和仿真技术

阐述了塑料异型材挤出成型模具在设计与制造中的建模和仿真的基本方法,指出产品开发过程及塑料挤出成型模具的仿真和虚拟样机及虚拟制造技术是加快开发塑料挤出成型新产品步伐的必由之路.     

基于MATLAB的模糊控制器设计及其性能分析

本文首先介绍了模糊控制器的工作原理，并对一典型的二阶系统设计了模糊控制器。用MATLAB对所设计的控剞器进行了仿真验证，并详细分析了比例因子对模糊控制器性能的影响。     

有源滤波器的计算机仿真模拟

介绍了OrCAD/Pspice 9软件的特点及其应用 ,并运用该软件设计了一个二阶模拟带通滤波器 ,对它进行计算机仿真模拟。     

心内科规范化培训教学中融入情景模拟结合案例教学法的探讨

心血管内科疾病病情多变且突发急症多,使规范化培训带教困难,学员思维培养和技能掌握效果较差,因此传统的授课方法难以适应临床教学要求。本课题拟结合心内科疾病的特点,探讨情景模拟结合案例教学法的教学方式在心内科规培中的优越性及可行性。情景模拟结合案例教学能通过分析典型病例,深入理解疾病机制,在讨论中发散学习,形成立体的诊疗思维,并利用情景模拟训练临床技能,适应环境压力,适合心内科住院医师规范化培训。     

Random vibration analysis of switching apparatus based on Monte Carlo method

The performance in vibration environment of switching apparatus containing mechanical contact is an important element when judging the apparatus’s reliability. A piecewise linear two-degrees-of-freedom mathematical model considering contact loss was built in this work, and the vibration performance of the model under random external Gaussian white noise excitation was investigated by using Monte Carlo simulation in Matlab/Simulink. Simulation showed that the spectral content and statistical characters of the contact force coincided strongly with reality. The random vibration character of the contact system was solved using time (numerical) domain simulation in this paper. Conclusions reached here are of great importance for reliability design of switching apparatus.     

基于coons曲面的数字地面拟合

把广泛应用在汽车车身设计、船体设计和飞机机身设计等计算机辅助外形设计领域的Coons曲面引入数字地面拟合,综合实例对双三次Coons曲面进行数字地面拟合的基本思想、构造方法和精度分析等方面进行了研究,并证明了方法的可行性.     

雷达对抗模拟训练系统设计

在分析了雷达对抗与反对抗模拟训练系统功能需求的基础上,设计了一种基于分布式局域网络的模拟训练系统。实践证明,该设计功能齐全、技术成熟、运行稳定,能够独立地形成训练所需的战场环境和电磁态势,对同类模拟训练设备的设计开发具有借鉴意义。