摘要：A wireless communication system can be tested either in actual conditions or by a hardware simulator reproducing actual conditions. With a hardware simulator it is possible to freely simulate a desired type of a radio channel and making it possible to test “on table” mobile radio equipment. This paper presents an architecture for the digital block of a hardware simulator of MIMO propagation channels. This simulator can be used for LTE and WLAN IEEE 802.11ac applications, in indoor and outdoor environments. However, in this paper, specific architecture of the digital block of the simulator is presented to characterize a scenario indoor to outdoor using TGn channel models. The switching between each environment in the scenario must be made in a continuous manner. Therefore, an algorithm is designed to pass from a considered impulse response in the environment to another in other environment. The architecture of the digital block of the hardware simulator is presented and implemented on a Xilinx Virtex-IV FPGA. Moreover, the impulse responses are transferred into the simulator. The accuracy, the occupation on the FPGA and the latency of the architecture are analyzed.

摘要：Over the course of the past decade, power generation based on wind energy has become a significant component in modern power systems, which has caused substantial increase in the wind power based research. As it is complicated to use a real wind turbine for laboratory purposes, development of a replica of a real wind turbine that can be connected and used indoors is imperative. This paper presents the design and development of a wind turbine simulator that operates on the typical power-speed characteristics of a wind turbine. First, the mathematical model of the wind turbine simulator is developed and the corresponding CAD simulations are carried out. Proposed hardware implementations involve a DC motor-DC generator set, a variable load and a control system based on PI controllers. It is a simple, low power and low cost design that can be easily connected to an AC system through an inverter.

摘要：This study involves the applications of different numerical techniques in a more general way to the design of a simulator for an enhanced oil recovery process with surfactant assisted water flooding. The data from a hypothetical oil well and a Nigerian oil well were used for the validation of the simulator. The process is represented by a system of nonlinear partial differential equations: the continuity equation for the transport of the components and Darcy’s equation for the phase flow. The orthogonal collocation, finite difference and coherence theory techniques were used in solving the equations that characterized the multidimensional, multiphase and multicomponent flow problem. Matlab computer programs were used for the numerical solution of the model equ- ations. The predicted simulator, obtained from the resulting numerical exercise confers uncondi- tional stability and more insight into the physical reservoir description. The results of the ortho- gonal collocation solution were compared with those of finite difference and coherence solutions. The results indicate that the concentration of surfactants for orthogonal collocation show more features than the predictions of the coherence solution and the finite difference, offering more opportunities for further understanding of the physical nature of the complex problem. We have found out that the partition of the three components between the two-phases determines other physical property data and hence the oil recovery. The oil recovery for the Nigerian oil reservoir is higher than the recovery predicted for the hypothetical crude. The displacement mechanism for the multicomponent and multiphase system is stable in the Nigerian oil reservoir due to the mod- erate value of the oil/water viscosity instead of the hypothetical reservoir with high value of oil/water ratio.

摘要：This article designs a Rayleigh fading channel simulator using IIR filter (called Doppler filter), which is used to approximate the Jakes Doppler spectrum. We mainly focus on the design of Doppler filter and model it as an optimization problem. Non-convexity of the problem is proved in this paper and genetic algorithm (GA) is used to optimize it, which has never been used before in this area. Simulation result shows that GA converges at the solution corresponding to very accurate approximation of Jakes PSD. Finally, several statistical characteristics of the simulator are verified, including correlation functions and level-crossing rate (LCR), all of which match the theoretical predictions pretty well.

摘要：给出了基于VSS平台的锁相环仿真过程,并将其引入课堂教学和实验。同时给出了锁相环的仿真模型,构建了完整的锁相环系统,并给出了仿真波形与环路滤波器设计方法。实践证明,采用这种方式可以帮助学生对相关内容的理解,并为今后进行系统设计工作打下良好的基础。

摘要：静态体系结构模型中的各种要素以及它们之间的信息流是以静态的方式描述的,无法显露体系结构设计的薄弱环节和瓶颈。对此,基于SA simulator流程仿真工具,开展了流程模型的建模与仿真。通过对SA simulator流程仿真工具的原理及仿真流程的分析,以美国导弹防御系统为背景,在明确其主要作战要素(作战任务、作战节点及作战过程)之后,使用SA simulator该流程仿真工具,基于IDEF3方法建立了导弹防御指控流程模型;从IDEF3规则、进程流的属性设置及关系配置与分配两个方面对模型进行验证。最后,进行流程仿真,研究了战略指控系统节点使用率、活动平均执行时间对指控流程的性能影响,并提出了相应的改进措施,以改进、优化导弹防御指控体系结构。

摘要：为了提高低压电力线载波通信的可靠性,以基于传输矩阵的动态路由算法为例,探讨基于OPNET simulator的低压电力线载波通信路由算法。探讨数据帧设计、进程建模、节点建模和网络结构建模的方法,由仿真结果可以分别确定创建传输矩阵所需时间与传输速率和节点数量之间的关系。

摘要：文章简述了WAP体系结构以及WSP协议特点,给出了一个实现无线应用的移动终端模拟软件的体系结构,论证了使用Java技术开发移动终端模拟软件的可行性,最后提出了一种设计和实现WSP协议方法,为无线应用(WML网络浏览、彩信收发等)提供基于会话的数据传输服务,研制的模拟软件能很好地测试WAP网关的性能。

摘要：介绍了3种PLC实验系统,分析了各自的优缺点,并以"液体混合装置控制"实验为例,重点介绍了基于三菱GX、GT系列软件的PLC虚拟实验室的建设方案。在PLC虚拟实验室只需计算机和相关软件就可以完成PLC程序设计、运行调试、过程监控等实训内容,是一种廉价、高效的实训系统。

摘要：按照电镀生产工艺要求,利用GX Developer编写PLC控制系统程序,利用GT Designer设计触摸屏监控界面,设计出的电镀控制系统可实现点动和自动控制。利用GX simulator和GT simulator仿真调试控制系统,可以在控制系统设计调试初期及早排查错误,提高系统的调试效率。