基于RS-232的发射装置故障诊断技术研究

故障诊断是航空电子装备修理中很重要的环节,是装备修理得以顺利完成的前提和重要保证,其要求是准确、快速、简便。本文提出了一种通过RS-232和嵌入在空空导弹发射装置发控软件内部的检测程序进行故障诊断的方法,并给出了总体设计思路和软、硬件实现方案。     

基于SJA1000的CAN_RS232/485接口卡的设计

论文针对煤矿监测监控系统中CAN总线与RS-485总线及PC串口如何互联的问题,提出了CAN_RS232／485接口卡的设计方案,介绍了基于SJA1000的CAN_RS232／485接口卡的功能,并详细描述了硬件模块设计、软件模块设计,最后说明了该卡的测试结果及应用背景。     

基于VB6.0的风井综合参数监控软件设计

介绍煤矿风井综合参数监控软件设计。系统采用无线网络通信技术,其接口电路通过RS-232网络和87C552单片机的串行接口,构成多机通信网络。上位机系统通过VB6.0中的通信控件MSComm实现了以PC主机与多台单片机分站的串行通信,并利用VB6.0编程实现实时数据的采集处理及控制、数据实时显示、报表打印和报警等功能。     

ICP-MS测定辐射环境监测样品中238U和232Th比活度实践

Monitoring of ²³⁸U and ²³²Th in radiation environmental samples including water and biota was requested by the related international and national safety guides and standards. Inductively coupled plasma mass spectrometry (ICP-MS) was applicable to determination of ²³⁸U, ²³²Th in such samples with a high sensitivity and working efficiency. Some practical aspects are presented.     

基于嵌入式系统的塑料挤出机温度控制器设计

设计了基于嵌入式系统的温度控制器。这种控制器是基于飞利浦半导体公司的P89LPC936微控制器、PC机和Visual C＋＋程序设计语言的基础上,实现了低成本高精度的温度控制器设计方案。实现嵌入式系统对挤出机温度进行实时控制和通过PC机对过往数据的读取以及目标温度的设定。采用模糊控制原理的温度控制算法提高了系统的稳定性和温度控制精度,在实验条件下温度波动小于1℃,成本降低50％。可以取代传统控制,满足塑料机械的控制精度、可靠性及效率工艺要求。     

无人值班变电站监控系统三级通讯网络的设计与实现

文中主要介绍了井下采区无人值班变电站监控系统中测控单元、智能通讯接口 (工控机 )、监控主机三级网络通讯的硬件设计与软件实现。实践证明 ,该系统具有较高的可靠性 ,并在现场取得良好的效果     

基于GPRS的风井综合参数安全监控软件设计

此软件是为地面风井综合参数监控设计的。传输数据采用GPRS无线网络,80C552单片机和RS-485网络的串行接口电路,构成多机通信网络。上位机系统PC主机与多台单片机分站的串行通信是通过VB6.0中的通信控件MSCOMM实现的,利用VB6.0编程可以实时进行数据采集处理和控制、数据实时显示、报表打印及报警等功能。     

高能物理实验中CAEN系列高压系统自动控制方案

针对高能物理实验中常用的CAEN系列高压系统SY1527、SY127／227,基于TCP／IP网络通讯技术、CAMAC总线技术、PCI总线技术和RS232串口总线通讯技术,实现并开发了适用于Linux／Win32系统不同版本的自动控制软件。用户可以依次编译独立的程序,按照设定自动开启,升降高压,并可实时监测高压系统的运行状态;亦可将此自动控制软件集成于数据获取系统,实现控制与采集同步,极大提高实验效率。     

Numerical verification of the continuous calculation method for tip stress during the driving process of the dynamic penetration test

This paper presents a calculation method for obtaining the continuous variation in stress between the tip and the soil during dynamic penetration tests, particularly in the case of using the Panda 3® penetration testing device. The originality of the method is that the tip stress can be computed continuously throughout the driving process. For each impact of the hammer on the penetrometer, data are recorded by sensors located at the top of the apparatus. Then, the stress at the tip and the displacement of the apparatus are calculated with a method based on the propagation of waves in the device. A three-dimensional numerical model of the penetration test, based on the Panda 3® specifications and using the discrete element method (DEM), is proposed in this paper. The purpose of the simulations is to validate the calculation method by comparing the curves of the tip stress versus the penetration distance obtained in two different ways, the first being the distance directly observed at the tip and the second being the distance calculated from the data recorded at the top of the penetrometer, as with the experimental device. The entire apparatus is represented, including the hammer, the rod, and the tip, and is driven into the model soil. The calculation method is applied, and the results are compared to the actual response of the soil to the driving of the penetrometer directly at the tip, which can be obtained with the numerical model. The responses are found to be very similar, confirming the theoretical framework and its underlying assumptions. This method is applied to dynamic penetration tests and provides the opportunity to obtain mechanical parameters other than the tip resistance from the tests.     

某型末制导雷达自动测试系统设计

介绍了基于GPIB总线和RS-422接口协议的自动测试系统设计,从硬件和软件两个方面详细说明了系统的设计方法,系统具有模块化、层次化和开放式的特点,便于维护和升级。阐述了硬件部分的组成、设计方法和适配器。软件部分采用面向对象、可视化设计的快速应用开发软件平台Labw indos/cvi和VC＋＋完成编辑、编译、连接、调试等开发。该自动测试系统大大提高了设备测试的效率和可靠性。