一种通用声呐信号源的设计

在设计主动声呐系统时,为了使声呐系统能够在不同的工作环境中达到最佳效果,需要设计相应的声呐波形。采用ADI公司DDS芯片AD9959设计了一种可编程的通用多通道声呐信号源,可生成任意的声呐信号波形,其具有十分重要的应用前景。     

基于FPGA的简易触摸电子琴设计

简易触摸电子琴是以FPGA芯片作为系统控制核心,通过数控分频的原理实现音乐自动播放、琴键演奏的功能,有限状态机实现触摸控制和LCD显示驱动,再采用友晶科技的4.3寸液晶触摸显示屏(LTM)完成简易触摸电子琴模式选择控制和琴键显示控制。在DE0-Nano FPGA(Altera CycloneⅣ)开发板上的测试表明,所设计的低成本简易触摸电子琴可以实现触摸控制弹奏和自动播放乐曲的功能,同时具有较高的实用价值。     

基于PLC的缠绕机低成本控制系统设计与应用

本文利用可编程控制器的多轴插补、高速定位功能,将继电-接触器控制的普通缠绕机,改造成为PLC控制的数控缠绕机,采用玻璃纤维预浸胶带分别进行纵、环向缠绕成型,并对纵向外移量、环向缠绕长度、排纱精度、缠绕张力及表面温度等参数进行测量与分析,并对利用该缠绕机缠绕成型的6台150容器进行水压爆破实验,得到水压爆破压强均略高于设计值,且离散较小,表明:利用PLC控制的缠绕机能够满足工艺要求,可以进行纤维缠绕制品的稳定生产。改造后的PLC控制数控缠绕机具有缠绕精度高、产品性能稳定、成本低、操作界面友好、设备运行稳定及可维护性好等优点,本文方法适合于机械式缠绕机的技术升级。     

对真空热处理设备电流异常波动处理办法

针对电流出现异常波动时，真空热处理设备加热系统保护无相应报警功能的问题，采用实时电流比较的方法，当电流发生异常波动时实现预警功能，达到最大限度保护设备的效果。系统反应灵敏，设计制作简单，操作维护方便，运行稳定安全。     

A universal programmable driving circuit for spatial light modulators

ea of only 65 × 65μm2.     

热电厂锅炉灭火保护系统的改造

对灭火保护系统的诸多问题进行分析，并解决了冗余配置的问题。     

On chip novel video streaming system for bi-network multicasting protocols

In the past three decades, tremendous Ethernet-related research has been done, which has led to today's ubiquitous Ethernet technology. On the other hand, with the emergence of new network needs, a new protocol, the IEEE 1394 standard serial bus (or Firewire) was introduced. Firewire is suitable for high-quality audio/video applications which do not perform well in the best-effort-based Ethernet technology. However, since Firewire is a serial bus, it has harsh cable length limitations as compared to Ethernet capabilities.In this paper, we present a novel on-chip system that receives Firewire video and transmits it in multicast mode using Ethernet protocol. A major advantage of this novel system is to utilize the existing Ethernet infrastructure to extend the range of Firewire video streaming to reach remote nodes and make it even accessible to nodes with a single Ethernet interface. This will have tremendous impact on Firewire applications such as deploying Firewire cameras in big-scale security-sensitive buildings or industrial facilities with image-based remote quality control.This novel chip utilizes the concept of Ethernet multicasting transmission mode for video streaming. The proposed chip design converts the IEEE 1394 isochronous traffic to the Ethernet multicast frame format via two off-chip asynchronous write and read buffers.The goal of this research is to design an On Chip Novel Video Streaming System that avoids performance bottlenecks in the software protocol conversion of these two important network protocols. The author decided to study these two networks because of their broad use and cable power provisioning capabilities. The novel system design is implemented using a customized field programmable gate array (FPGA), which enables the integration of various system components on one chip. The designed prototype is studied using both network monitoring tools and analytical techniques, to verify its function and compare it with the existing approaches.Performance measures show that the On Chip Novel Video Streaming System consumes less than 21 mW of power for 100 Mbps and 82 mW of power for 1 Gbps, and utilizes 57% of a Xilinx Spartan 2-100E-6FT256 FPGA resources. Hence, it is possible to incorporate further extensions. Experimental results show that 88% of the network utilization can be achieved, due to the use of the customized, FPGA-based design of bi-network traffic conversion.     

功率因数校正的数字化控制

高能加速器的电源系统是加速器最大的电能使用系统，提高加速器的运行效率和经济性一直是电源系统的目标。为提高开关电源的功率因数，在数字化开关稳流电源的基础上，设计了一种功率因数校正(PFC)的数字控制方案。重点阐述了基于硬件描述语言(VHDL)的数字控制环的算法、多通道模数转换器(ADC)的控制和脉宽调制(PWM)信号的产生，以及如何将其作为片上系统的用户外设。经测试表明，该方案有效地提高了开关电源的功率因数，达到了预期的设计目标。     

论可编程计算器在施工测量放线中的应用

在分析了公路测设特点的基础上,针对公路勘测条件的不同,重点阐述了利用可编程计算器对目前常用的路线测量程序的编写及应用,以期加快测量放线速度,提高工作精度和效率。     

科学采用施工坐标 提高施工测量效率

结合工作体会,系统总结了AutoCAD和CASIO5800编程计算器在坐标转换中的应用,并对目前工程测量作业提出了自己的一些看法,以达到提高施工测量效率的目的。