Homogenization of hardness distribution and distortion in high pressure gas quenching

Quenching with gases rather than oil or other liquid media has the advantages of reducing the risks concerning health and environment, while simultaneously homogenizing the quenching results and minimizing distortion due to a wide range of possible process parameter variations and the pure convective heat transfer. In this contribution, a coupled solution for increasing homogenization of quenching results within high pressure gas quenching will be presented. In the first stage, an experimental test facility was set up for flow investigations and in the second stage a numerical simulation model was generated. The numerical and experimental results of the flow through the chamber were compared for several boundary conditions. Finally, after complete verification of the simulation, the model may be used to assist in parameter variation for optimization of homogeneous high pressure gas quenching.     

基于MAX+PLUSII模块化设计的智力竞赛抢答器

设计了一款造价低,体积小,操作简单,适用性广的抢答器。该抢答器是基于MAX+PLUSII软件,在FPGA芯片上设计的,可实现多人智力竞赛抢答。     

企业各软件的数据共享和整合分析浅谈

本文主要根据大多数企业存在各种软件各自独立运行,各软件之间数据不能相互共享,一些旧软件或不适用的软件与目前主流操作系统不兼容等问题,分析问题并用接口和整合方法解决,此平台利用云计算技术,解决大多数企业建设信息平台投资大的问题,同时方便企业使用和维护.     

网络课程设计中学习者学习动力的调查与建议

网络教育中有关学习者学习动力的研究日益受到重视,通过对现有网络课程设计中学习者学习动力设计状况的调查可发现其中存在的问题,分析这些问题与不足并针对性地提出改进建议,以期对网络课程的完善提供有益参考。     

基于FPGA的激光粒度仪数据采集系统

本文采用ALTERA公司Cyelone系列的FPGA芯片和IP核PCI_t32,设计了可应用于LSA系列激光粒度测试仪的数据采集系统,并在FPGA内部实现了系统的控制逻辑和PCI总线接口.该系统利用AD7321可为112路模拟信号提供一个12位采样精度的数据采集通道,系统的数据平均传输速率达到了3Mbps.利用该数据采集系统对标准粒子板的测量结果符合ISO13320标准的要求,这表明该系统满足了设计的要求.     

基于FPGA的高速数字相关器设计

在数字通信的数据传输过程中,需要保持数据在传输过程中的同步,因此要在数据传榆过程中插入帧同步字进行检测,从而有效避免发送数据和接收数据在传输过程中出现的异步问题.文中提出了一种采用流水线技术、基于FPGA设计高速数字相关器的方法.仿真结果表明设计方案是可行的.     

PCI接口高速数据采集与处理卡的设计

利用可编程逻辑器件搭建了一个可编程的数据采集平台.     

Design and analysis of turnover platform for welding robot北大核心CSCD

A turnover platform for welding robot was designed for the application of welding robot with lower accuracy requirement, which was of low cost and higher position accuracy. In this turnover platform, the pneumatic motor was used as the power output, and the indexing mechanism with high accuracy was the transmission system with high transmitting ratio based on worm and wheel. The position information was acquired by using the photoelectric encoder, and the turnover motion with high accuracy was realized through the closed-loop controller. Simulation results showed that the maximum speed of the welding platform approached 14 r/min, and the platform could meet the requirements of most welding products. Such a turnover platform can offer the application program of the welding robot with low cost for the middle and low level products, and reduce the cost of welding robot and improve welding productivity.     

基于积件思想的高职计算机课程项目式教学探索——以C语言程序设计为例

基于积件思想,对五年制高职计算机课程项目式教学进行探索,以C语言程序设计为例研究分析,并组建C语言程序设计课程知识点积件库,编写高职C语言程序设计课程项目式校本教材,分析C语言程序设计课程教学项目“阶梯电价计费”.并借助开源平台Moodle实现了教学项目的应用.     

基于FPGA的高速自适应滤波器的实现

在LMS算法进行变步长处理的基础上,结合驰豫超前流水线技术和时序重构技术提出了创新结构和改进算法,在FPGA的仿真综合环境中设计实现了该高速自适应滤波器,并且在AlteraDE2-70开发板上进行了板级测试。