随着学生规模和信息量的日益扩大,就需要开发一个实用的成绩分析系统来提高老师们的工作效率.本着这样的需求设计开发出一款基于MATLAB GUI成绩分析系统,通过读取一份成绩单文件便可以对学生成绩做一个数据处理和细致分析.该数据分析界面友好、操作方便、交互性强、维护简易,实现了数据的可视化操作,并极大提高了教学办公的效率和效果.

Traditional location method of hidden failure in power system has some defects,such as poor location precision.In order to overcome the defect,a new quick location method is presented in this paper.Firstly,the hidden failure model before the power system fault is acquired to confirm hidden failure line.The state estimation model of the hidden failure location is built,and location and resistance of the hidden failure is estimated.Then,synchronously,the optimal distribution in space of data of the hidden failure is measured.The feature of synchronous frequency signal and voltage signal supplied by the power system is extracted.Moreover,the characteristic quantities of signal in power system are classified.Finally,the location of the hidden failure is confirmed via time-frequency characteristic of the voltage signal.Simulation results show that the method has robustness of quick location of the hidden failure.

印刷电路板( PCB)在现代电子设备中有广泛的应用,是集成电子元件的信息载体,其质量对产品的性能有很大的影响. 随着技术与工艺的不断提高,使得PCB的层数更多,密度更高,传统的人工检测已经无法满足实际生产的要求,不仅要求工人有一定的专业知识,人为因素还会导致检验的效率不高,易发生漏检和误检. 本文针对山西某公司的矿用动力中心印刷电路板,设计了一套检测装置,从硬件和软件两方面描述系统的功能与设计思路,实现了对印刷电路板自动检测和指导手工检测的功能,并且介绍了西门子S7-200 系列PLC在印刷电路板检测系统中的应用,对提高印刷电路板的检测效率具有较大的意义.

为提高电力系统的安全运行水平和电能质量,链式SVG已成为交流输电系统中广泛应用的无功补偿设备.分析了带变压器的链式SVG的拓扑结构,在d,q旋转坐标系下对其控制策略进行了研究.电流控制策略采用d,q旋转坐标系下的前馈解耦控制.为解决链式SVG的直流侧电压稳定和不平衡问题,提出直流电压的分级控制策略.最后应用Matlab进行了系统仿真和实验,验证了该控制策略具有良好的动态响应和静态补偿效果.

针对煤矿井下谐波检测中存在的问题,设计一种基于冗余第二代小波分解的煤矿井下电网谐波检测的方法与治理方案.以煤矿井下低压电网为基础,利用Matlab仿真软件建立含有奇次谐波和噪声的谐波,分别用多种提升小波分解,找出最适合的提升小波方法,然后用冗余第二代小波变换分析电网谐波.该方法对井下谐波的快速检测更适应矿井电网的需求,且效果好,能确保井下电网的安全生产.

In communications of spreading spectrum, the receiving end of the reference pseudo-random sequence code with the received spread code synchronization is the key to whether its correct despreading.The article describes that the analysis and the program design that included the principle of a pseudo-random sequence synchronization,synchronous capturing of right and wrong,synchronization decision threshold and despreading competitive adventure;By edge capturing,the processing of the code of autocorrelation function of pseudo-random,the closed-loop module of watchdog of false alarm which synergy the precise role in achieving the spreading code synchronization and despreading.System design using tools include QuartusII, DSP Builder and Simulink joint development platform.HDL language can designs created IP, and desiners can look at the design simulation results in time,and make engineering fast.

This paper has proposed a design method for SOPC of LCD driver based on FPGA. In the system of SOPC, FPGA is the core controller, NiosII embedded into an EP3C25F324C8Z of Altera CycloneIII series, and peripheral driving circuit designed. Combining modular design ideas and rich logic resources of FPGA, this paper has designed SDRAM module, FLASH module, VGA module, PLL module and other IP soft cores, which are integrated into a piece of FPGA. The LCD driver control with 640×480 dots is realized. The correctness and feasibility of FPGA-based hardware design have been verified by debugging.

In image processing, edge detection is more basic and important image processing algorithms. This paper conducted a FPGA-based image analysis algorithms and program design; system design using QuartusII, Modelsim, Matlab joint development, HDL design can be synchronized image algorithm design and effects simulation, real-time look at the image processing results, efficient and intuitive works design.

In order to achieve control from the floor of the coal mine belt conveyor remote real-time and protect the safety belt conveyor operation,this paper designed various sensors posed conveyor belt monitoring system based on LPC1752 chip,CAN bus.And this monitoring system eventually realized the coal mine conveyor monitoring and protection real-time.

In this paper,Fire Dynamics Simulator is adopted to analyse data.It summarizes the influences of fire location on response performance of Aspirating Smoke Detector Fire Alarm System by designing different fire source position,and provides theoretical basis for such simulation study and engineering acceptance test.

Information retrieval system has been a necessity in people's daily life.This paper proposes a site search solution based on the open source search engine library-Xapian.The system is implemented using PHP and runs under Linux.After deployment,the system works well on performance,speed and retrieval precision.

根据煤矿生产需要,设计了一种基于PLC的高压隔爆馈电组合开关,概括介绍了系统各功能单元的设计思路、工作方式以及各主要参数的设计指标。实际调研表明:该系统有助于提高大型煤矿的生产效率,降低生产成本,并且使用灵活方便。

The reason why arc happened in a low voltage circuti was explained,and the arc maker was used to simulate the phenomenon when series arc happened.The arc current character was analyzed when arc happened both in time domain and frequency domain.Combining the measurement method exitied,a new idea of measure-ment method was proposed,and its principle was explained.At last,the future development about AFCI was pre-dicted.

This paper designed the software of intelligent parking system based on HMI and PLC.The control system uses PLC as the main control unit.By analyzing the calculation of establishing the downlink channel,we have designed the movement program of vehicle-containing,and completed the design of the control system software.

Due to the difference between the directly measured torque parameters of the electric and hydraulic control system for the raise boring machine and the actual torque was too high,it was necessary to correct the torque measured with other mode.With the analysis on the cause of the error occurred,the test mode was applied to study the relationship between the pressure loss and the rotation speed,the linear fitting method was applied calculate the amount of torgue to amend the function expression.After the correction of the torque,the actual operation was applied to the suitability of the method.The method could have a certain guidance meaning to the parameter correction of the other electric and hydraulic control system.

The course of Digital Electronics Technology is the public technology courses,such as the computer,communications, and electronic information,etc.According to the characteristics of inquiry learning,the article put forward the ways of the inquiry learning of carefully guiding to stimulate the students desire to study independently;deliberately showing mistake,and guide to explore the scientific conclusions;let go to practice,and train the students to explore their own capabilities and the ability of the cooperative learning,all these aspects achieve a better teaching results in the teaching practice.

"Electrical Engineering and Electrotechnics" course is a compulsory course for non-electronic engineering major.The article,based on modern teaching idea,deeply and thoughtful discussed the teaching contents,teaching process as well as education techniques of electronic technology course.The article highlight out the "input" and "interactive learning" teaching method,by combine modern multimedia education means and traditional writing on black board teaching method as the teaching pattern to reach better educate effect.

素质教育下高校模拟电子技术课程教学的目的在于引领学生掌握该课程的主要内容并将其应用于具体实践,因此在教学活动中要注重发挥学生的主观能动性。在上好第一堂课的基础上,通过类比、比较、设问等教学方法,借助多媒体教学和仿真软件等手段,增强学生的感性认识,激发学生的学习兴趣,从而调动学生的学习主动性。通过建立理论考试与实践考核相结合的评价体系,督促学生注重理论与实践的结合,提高学生分析解决具体问题的能力。

This paper focuses on the researches of dual-PWM three-level mine hoists flux oriented variable frequency drive system.A novel hybrid clamped dual-PWM three-level circuit topology is discussed,the work principle of this converters is analyzed.The control circuit and main circuit are designed with digital signal processor(DSP) and complex programmable logoc device(CPLD).Experimental results prove the proposed system has high power factor,series connection of low with-stand voltage switches,high efficiency,4-quardant running and rapid dynamic response ect,so it is propitious to high power variable frequency adjustable speed mine hoists system.

数字电子技术课程是计算机类、通信类、电子信息类等专业的公共技术基础必修课,受到各个专业的重视。本文基于现代教学设计思想,对数字电子技术课程教学方式进行了设计和探讨,提出了课堂教学实现传统板书和多媒体教学方式的有机结合以及网络教学与课堂教学相结合的教学模式,教学实践中取得了较好的教学效果。