APACS DCS系统在化工生产中的应用

介绍用APACSDCS系统实现对生产过程的操作控制,对系统配置和网络结构,以及系统的实现作了相关描述,总结了该系统的性能特点。     

离心式压缩机计算机辅助设计系统

介绍了离心式压缩机计算机辅助设计系统ＬＹＣＡＤ的研制,概述了ＬＹＣＡＤ系统的基本结构,设计思想及关键技术的实现方法,该系统实现了离心式压缩机设计过程,计算过程和绘图过程中的统一,并给出了设计实例。     

基于XML的数控机床远程监测与诊断系统研究

在分析数控机床远程监测与诊断系统需求的基础上,介绍了系统框架体系结构和技术体系结构,并对系统实现过程中基于网络的数据传输技术进行了研究,最后给出了系统的实现过程。     

离心式压缩机计算机辅助设计系统

介绍了离心式压缩机计算机辅助设计系统ＬＹＣＡＤ的研制。概述了ＬＹＣＡＤ系统的基本结构、设计思想及关键技术的实现方法。该系统实现了离心式压缩机设计过程、计算过程和绘图过程的统一,并给出了设计实例。     

基于ARM微处理器的嵌入式TCP/IP协议的实现与应用

本文介绍了嵌入式系统的基本概念,讨论了嵌入式系统实现网络化的一种新思路-通过简化通讯协议来实现嵌入式系统与网络的互联,以ARM微处理器为平台实现了一套完整的嵌入式TCP/IP协议栈,最后介绍了该协议栈在工业以太网控制过程中的应用方法及原理性系统图.     

基于GPRS的轨道状态远程监测系统

设计了基于GPRS的轨道状态远程监测系统,详细介绍了系统的组成,通过GPRS模块建立GPRS连接的过程以及通过PPP协议实现数据传送和监控的过程,该系统对于轨道状态远程监控的实现具有实际应用价值.     

计算机自动测试系统的应用

该文简述了计算机自动测试系统的特点,介绍了计算机自动测试系统的组成方式,以热处理炉炉温均匀性自动测试系统为例,详细分析了热处理炉炉温均匀性自动测试系统的系统结构以及工作原理。介绍了计算机自动测试系统数据处理过程、接口总线的应答方式,分析了热处理炉炉温均匀性自动测试系统采用RS232C通信方式的实现过程。     

数控铣镗床滑枕进给精确定位补偿系统的研究

研究了数控铣镗床滑枕进给精确定位系统的关键技术,介绍了以基准杆和位移传感器方式对实现数控铣镗床滑枕精确定位补偿系统的关键结构和实现过程。     

基于模糊神经网络的机械加工参数自动选择研究

利用模糊神经网络的推理和学习能力,在对机械加工过程中的切削参数进行自动选择的基础上,研究了一套基于机械加工参数自动选择的数控编程系统。运用VC＋＋开发的系统实现了网络参数替换源程序中车削参数,实现了数控加工程序的自动生成。对此编程系统进行了详细的介绍,介绍了该软件的实现过程,并且用具体的实验测试了该软件并得到了标准的指令代码G代码。     

基于GPRS的轨道状态远程监测系统

设计了基于GPRS(GeneralPacketRadioService)通用分组无线业务的轨道状态远程监测系统。详细介绍了系统的组成,通过GPRS模块建立GPRS连接的过程以及通过PPP协议实现数据传送和监控的过程。该系统对于轨道状态远程监控的实现具有实际应用价值。     

机器人数据采集系统研究

在Windows系统下，基于多线程技术，设计了一种机器人系统的数据采集系统。介绍了该系统的硬件构成和软件结构，并详细讨论了如何使用多线程技术实现其软件系统。     

Optimizing a servo system for a coordinate measuring machine

Time saving is the primary justification for a CMM. The data acquisition activity (probing), in general, occupies over 95% of the real cycle time, and is dictated by the characteristics of the machine and its servo control system. Considering all the requirements, a control system based on a microprocessor was chosen. The microprocessor can be programmed to suit the system requirements in a way which cannot be achieved in pure hardware systems. The control program can even be edited in real time by passing relevant parameters from the supervising computer, if required.     

部分充有粘性流体的转子系统稳定性的理论分析

在直接对二维 Navier- Stokes方程进行线性化的基础上 ,详细分析了二维粘性旋转流体模型 ,得到了旋转流体对转子作用力的表达式 ,然后研究了部分充液转子系统的稳定性问题 ,分析了转子系统的各参数对稳定性的影响     

一类两自由度含间隙系统分岔与混沌的形成过程

通过对一类双自由度含间隙系统一组系统参数的仿真,证明单自由度含间隙系统中不仅存在叉式分岔、倍周期分岔,还存在Hopf分岔,并给出了发生Hopf分岔的具体系统参数以及Hopf分岔与混沌的形成过程。对其分岔与混沌行为的研究为工业实际中含间隙机械系统和冲击振动系统的优化设计提供了充分的理论依据。     

Development of a compact tomography camera system using a multianode photomultiplier tube for compact torus experiments

A compact tomography camera system consisting of a photomultiplier tube, a multislit optical system, and a band-pass interference filter has been developed. The viewing area and spatial resolution can be configured by the arrangement of the slit system. The camera system has been specially designed for self-organized compact torus experiments having strong magnetohydrodynamics events with a submicrosecond time-scale. The developed system has been tested on a field-reversed configuration formed by the field-reversed theta-pinch. Performance evaluation of the system has been performed by comparison to the former optical system.     

Lateral-torsional coupled vibration of a propulsion shaft with a diesel engine supported by a resilient mount

Lateral-torsional coupled vibration destabilizes a rotating system. The instability region of the rotating system is the speed range where the frequencies of the lateral and torsional modes intersect. In this study, the abnormally increased vibration of the typical diesel engine-reduction gear propulsion system for a naval vessel was examined in relation to the lateral-torsional coupled vibration under the assumption that it can be approximated by the Jeffcott rotor with three degrees of freedom. Through numerical and experimental investigation, a protection method was developed to avoid the unstable region of the diesel engine-reduction gear propulsion system.     

On-machine profile measurement of a micro cutting edge by using a contact-type compact probe unit

A new contact-type on-machine measurement system is designed and developed for the evaluation of a micro cutting edge profile. The measurement system is composed of a compact probe unit having a sharp stylus mounted on a flexible beam, an inner displacement sensor for the detection of the stylus displacement, and a two-axis precision positioning system. For the evaluation of tool faces having a steep slope, a new probing procedure with the enhancement of the inner displacement sensor integrated into the probe unit is newly proposed. After the design and development of the probe unit, the feasibilities of the developed measurement system and the proposed probing procedure are demonstrated through some basic experiments. Regarding the out-of-straightness and angular error motion of the two-axis positioning system employed in the developed measurement system, a pair of length gauges is newly employed to reduce the influences of error motions of the stage system. The topographic profile of the micro cutting edge obtained by the measurement system with the modified probe unit is then compared with those obtained by a commercial stylus profiler and a laser confocal microscope. The feasibility and effectiveness of the developed on-machine tool edge profile measurement system are also demonstrated through uncertainty analysis based on the GUM with the Monte-Carlo method.     

温室环境监控无线传感器系统的设计

该文设计的无线温室监控系统运用了传感器技术、计算机技术和通信技术,实现了对温室环境因子的测量与控制。该系统以PIC单片机为无线传感器节点核心,以高性能的传感器、检测电路以及数据传输的可靠性设计,实现了传感器节点和PC机的无线通信。实际运行情况表明,该系统实用性好、可靠性高,具有良好的应用前景。     

Characterization of the contact between a punch and a half-infinite substrate in a fretting situation

This paper analyzes the behavior of a mechanical system formed by a flat punch with square edges at 90 over a half-infinite substrate made of the same material under normal reversible constant and tangential loads, typical of a fretting situation. Based on previous studies of the behavior of such a system, both static and cyclic behavior are analyzed. The analysis is carried out using both analytical and numerical solutions, the latter being obtained with finite and/or boundary element codes. The kinematic behavior of the contact zone is studied (slipping, separation, or adherence), as well as the stress state of the substrate in the area surrounding the edges of the punch. The very same analyses have been made of a system equal to the latter but replacing the contact by continuity. The comparison of the solutions of the two systems gives the validity range of different continuous models, easier to use in representing the behavior of the punch–substrate system.     

Stabilization of nonlinear systems with a slowly varying parameter by a control Lyapunov function

Based on a control Lyapunov function (CLF) strategy, a novel approach for designing a controller for a slowly varying nonlinear system is proposed. The approach may be thought of as being in between the time-invariant and time-varying CLF techniques. If the time-invariant technique is used to control a slowly varying system, stability will not be guaranteed. On the other hand, the time-varying CLF technique, due to the control law, has complexity and needs to measure or estimate the derivative of system parameters. The advantage of the proposed method is its independence from the measurement or estimation of the derivatives of the system parameters. It is shown that the proposed control law can even be independent of the parameters of the system. In this paper, the conditions are derived that allow using the simple CLF formula that guarantees the stability of a slowly varying system. The efficiency of the approach is shown through some simulations.