共查询到20条相似文献,搜索用时 15 毫秒
1.
基于PLC/SCAD A结构的计算机综合控制系统 总被引:1,自引:0,他引:1
以工厂流程控制为应用背景,阐述基于PLC(控制)/PC-SCADA(监控)/MIS(管理)的三级分布式控制系统的设计方法,讨论了采用PLC实现过程控制,冗余热备,PC工控机SCADA实时监控和功能扩展以及管理控制一体化系统开发应用等关键技术。 相似文献
2.
3.
Chun-Jen Chung Hui-Ming Wee 《The International Journal of Advanced Manufacturing Technology》2008,35(7-8):665-679
An integrated approach is used to clarify the critical issues of scheduling and replenishment planning in an advanced inventory
system under stock-dependent selling rate environment. This is because integration removes the barriers between enterprises
and improves overall performance. A close collaboration such as just-in-time (JIT) operations also improves product quality
of the supply chain. Different from the single-stage inventory model, this study develops an integrated two-stage production-inventory
deteriorating model for the buyer and the supplier with stock-dependent selling rate, as well as considering imperfect items
and JIT multiple deliveries. Our paper proposes a significant method using a time-weighted-inventory approach to analyze the
supplier’s saw-tooth holding cost. We derive the optimal number of inspection, optimal deliveries and the optimal delivery-time
interval. A numerical example is also presented to illustrate the theory. The results show that the fixed demand rate, the
holding cost and the unit inspection cost are critical in the management of the deteriorating inventory model. 相似文献
4.
5.
Xiaoqing Tang Guijiang Duan Kwai-Sang Chin 《The International Journal of Advanced Manufacturing Technology》2007,32(5-6):608-616
As quality is one of the essential factors for manufacturing success in the global market, the Quality Engineering Laboratory
(QEL) of BeiHang University (BUAA) has been focusing on the research of methodologies for integrated quality information processes
to support quality management for more than 10 years. An integrated quality information system—QQ-Enterprise has been developed
for Chinese manufacturing industries. A three-dimensional quality information integration model and a flexible architecture
are proposed in this paper. The development of the QQ-Enterprise, which is a general-purpose IQIS developing toolkit designed specially for the Chinese manufacturing environment, and an
implementation template are also presented. 相似文献
6.
讨论了确定型离散需求下的单仓库库存模型,然后将其扩展为确定型离散需求下的分布式库存模型,再将随机离散需求下的分布式库存模型转化成确定型离散需求下的分布式库存模型,以此求解各加盟企业的联合订货策略,并用某种性能指标来评价并选取满足要求的解。最后,给出了基于遗传算法的求解算法,并给出了计算实例。 相似文献
7.
For the last few years, integrated navigation systems have been widely used to calculate positions and attitudes of vehicles. The strapdown inertial navigation system (SINS) provides velocity, attitudes and position information, whereas the global positioning system (GPS) provides velocity and position information. A method using neural network (NN) and wavelet-based de-noising technology is introduced into the SINS/GPS/magnetometer integrated navigation system, because system accuracy may decrease during GPS outages. When the GPS is working well, NN is trained using the velocity and position information provided by SINS as input and the corresponding errors as output. Wavelet multi-resolution analysis (WMRA) is also introduced to de-noise the errors, the desired output of NN. Test results showed that velocity accuracies improved using NN, but other accuracies remained poor. By re-training NN with WMRA, the system accuracies improved to the level of using normal GPS signal. In addition, NN trained with WMRA also improved the approximation to the actual model, further enhancing alignment accuracy. 相似文献
8.
9.
10.
设计了基于应变式集成化称重传感器的车辆行驶称重系统,其中包括集成化称重板的结构设计、利用有限元分析软件称重仪贴片位置设计、进行集成化称重系统的动态特性分析、以及进行信号采集放大与模数转换的硬件设备等介绍,同时也介绍了测试软件.该称重系统在公路车辆限速行驶状态下,能测出行驶车辆的静态质量、行驶速度以及轴距等车辆静态参数.最终经试验验证得到了本行驶称重系统可用于交通数据采集和辅助实施超载检查. 相似文献
11.
马远佳 《工业仪表与自动化装置》2014,(3):117-120
针对目前软PLC存在的不足,论述了一种软PLC与组态软件相结合的体系结构,基于IEC61131.3标准,在Linux平台上设计了一种集成组态的软PLC控制系统。阐述了系统的总体结构以及实现思路,重点介绍开发系统的程序转换算法和运行系统与组态软件的数据交换方法。 相似文献
12.
文中主要介绍了一套集成阀自动检测系统的软件开发过程,使用的软件开发平台是Measurement Studio for VB。通过该文,读者可以比较清晰的了解虚拟测试技术在实际工程测试中的应用,以及了解虚拟仪器开发平台Measurement Studio for VB。 相似文献
13.
14.
15.
16.
17.
集成环境下机械产品快速报价辅助系统 总被引:3,自引:1,他引:2
报价是企业在经营过程中一项重要的活动,传统的报价系统是一种被动响应的模式,对于价格的其他因素影响考虑不多。这里将客户需求、产品优劣势、竞争对手和市场状况等辅助因素的分析嵌入系统中。这样,不仅可以帮助报价系统给出合理的价格,更能展示客户感兴趣的产品属性,还有助于对企业市场发展策略的制定。 相似文献
18.
19.
针对摊铺机行驶驱动系统的特殊要求,重点研究恒速摊铺的控制问题.采用了模糊PID混合控制算法,利用Simulink对整个行驶驱动系统建立了数学模型并进行仿真分析,仿真结果表明采用模糊PID控制效果要优于传统PID控制. 相似文献
20.
非接触式IC卡智能消费系统的设计 总被引:1,自引:1,他引:0
介绍了一种以非接触式IC卡和Novell网络为核心的智能消费系统的设计方案,详细论述了该系统的基本模式、网络体系结构、数据库管理、软件开发工具等的原理和主要功能,提出了一些关键技术的处理方法,从中看出非接触式IC卡,不仅原理先进、使用方便、人机交互生动形象,而且防伪安全保密性强,是其他接触式IC卡不可比拟的,可广泛应用于各有关的智能消费和识别系统,具有很好的推广价值. 相似文献