共查询到20条相似文献,搜索用时 187 毫秒
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详细介绍了DALLAS公司生产的单总线数字温度传感器DS18820器件的内部结构、控制指令和工作时序,着重讨论了芯片的各种工作时序,结合单片机给出了煤矿井下多点温度测量系统的硬件接口电路及软件设计方法。 相似文献
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基于FPGA+ADSP的线阵CCD非接触测量系统 总被引:2,自引:2,他引:0
提出了基于FPGA和ADSP的线阵CCD非接触测量技术。选用线阵CCD作为前端信号采集;采用FPGA产生与控制整个系统的时序:CCD工作时序、A/D转换时序、ADSP采集数据同步时序;采用多次扫描平均方法形成一维数字图像;利用DSP高速图像处理性能并设计高性能的浮动阈值二值化算法对其处理。给出了时序仿真图,满足系统的时序要求;并给出了测量物体的波形。通过对光学系统的定标最终给出了物体的长度。数据表明,相比传统的测量系统,该系统具有高速和高精度的优点。 相似文献
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某型机炮模拟器主要包括单片机电路、电源模块接口、冷气装弹部件等组成,用来模拟机炮与飞机间的电信号传输、冷气工作时序、武器工作时序. 相似文献
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针对背照式CCD47 - 10的驱动时序要求,提出以FPGA作为时序发生器的驱动电路设计方案.通过对时序分析,完成时序发生器、电压偏置电路、驱动器3个模块的硬件电路设计.使用VHDL语言进行逻辑电路设计,实现电路控制、参数配置以及驱动时序产生.最后通过成像实验,对驱动电路性能进行分析.实验表明,该电路能驱动CCD47 - 10在两种模式下稳定工作,满足CCD47 - 10的应用要求. 相似文献
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总结了高速时钟电路时序分析及计算方法,并且对SDRAM在源同步工作方式下的总线时序计算做出了全面的介绍。通过对实际电路设计的分析得出了具有参考价值的结论,并对高速电路的PCB布局给出了分析。 相似文献
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为了提高积分时间可调型线阵CCD的时序调整灵活性和驱动程序的可移植性。根据积分时间可调型线阵CCD芯片的工作原理,在光积分栅电极脉冲的低电平区附近,对转移栅脉冲的时序加以改进,提出了一种新的驱动时序设计方案。程序设计语言使用了硬件描述语言Verilog,采用Modelsim软件对东芝公司的TCD1304AP时序方案进行了功能仿真,并针对ALTERA公司的EPM240T100C8N芯片进行了适配。仿真结果和硬件实验结果表明该方案正确,其具有可控性好、可移植性好、开发效率高的特点。 相似文献
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可集成制造执行系统(IMES)动态调度研究 总被引:5,自引:0,他引:5
在分析了国内外调度问题研究现状的基础上,提出沿用过程型MASS调度策略对可集成制造执行系统进行动态调度研究。首先构建了基于多代理的可集成制造执行系统(IMES)的体系结构,并详细地介绍了调度Agent的建模模块和调度决策模块的工作原理。最后结合标准调度6×6问题验证了此方法的有效性及可行性。 相似文献
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Amit Kumar Gupta Appa Iyer Sivakumar 《The International Journal of Advanced Manufacturing Technology》2005,26(11-12):1409-1413
The scheduling of highly complex job shops, such as those found in semiconductor manufacturing, involves multiple types of work centers, large and changing varieties of the products, sequence dependent set up times, reentrant process flow, dynamically changing environment, etc. These complexities make the job shop scheduling problem very strongly nondeterministic polynominally (NP)-hard and intractable to solve by the traditional scheduling approaches. This paper presents the concept and applications of the conjunctive simulated scheduling (CSS) approach, which incorporates the benefits of discrete event simulation in scheduling the shop and avoids the NP-hard formulation of these complex scheduling problems. The differences between CSS and typical simulation studies and its application to online simulation are also presented. 相似文献
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S. Saravana Sankar S. G. Ponnanbalam C. Rajendran 《The International Journal of Advanced Manufacturing Technology》2003,22(3-4):229-236
Though the designers of Flexible Manufacturing Systems (FMS) strive to ensure the maximum flexibility in the system, in practice, after the implementation of such systems the operational executives often find it hard to accommodate frequent variations in the part designs of incoming jobs. This difficulty can very well be overcome by scheduling the variety of incoming parts into the system efficiently. In this work an appropriate scheduling mechanism is designed to generate a nearer-to-optimum schedule using Genetic Algorithm (GA) with two different GA Coding Schemes. Two contradictory objectives of the system were achieved simultaneously by the scheduling mechanism. The results are compared with those obtained by different scheduling rules and conclusions are presented. 相似文献
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基于多智能体结构的车间调度方法 总被引:8,自引:0,他引:8
车间调度问题是一个复杂的 NP问题 ,车间调度系统需要具有相当的柔性机制。本文提出了一种基于多智能体结构的车间层动态调度方法。系统中有三种代理 ,车间代理、资源代理和任务代理协同并行工作。车间代理负责各个任务代理之间的协调 ,任务代理安排任务的调度路径 ,资源代理安排车间中的具体制造资源。车间代理能够动态调整调度规则 ,解决任务代理之间的资源分配冲突。任务代理采用招标投标机制选择最佳资源代理。资源代理能够提出并实时调整局部调度方案。本文实现了一个基于多智能体结构的车间调度原型系统。 相似文献
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P.Y. Gan K.S. Lee 《The International Journal of Advanced Manufacturing Technology》2002,20(3):214-222
Process planning and scheduling used to be two very separate processes. However, owing to the recognition of the intricate
relationship between them, recent work has focused on integrating the two processes. The use of flexible process plans in
scheduling allows more flexibility in production and thus gives substantial cost savings. It also increases the solution space
of the optimisation problem and makes it more critical to have an effective optimisation algorithm than for traditional scheduling
problems. This paper describes a process-planning and scheduling system that makes use of the branch and bound approach to
optimise priority weighted earliness of jobs scheduled in a mould manufacturing shop. Instead of consideing a flexible manufacturing
system, this paper focuses on the demands of less integrated factories, which are especially typical of mould manufacturing
shops. The layout of the system, the methodology of the algorithm and effectiveness of performance measures for real industrial
use are discussed in the paper. 相似文献
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基于多代理结构的Job Shop动态优化调度策略的研究 总被引:6,自引:0,他引:6
把基于多代理技术的Job Shop动态调度方法与基于规则的调度策略相结合,在提出的基于多代理的Job Shop动态调度系统结构的基础上,着重研究了,规则调度策略在各级Agent行为设计中的应用,提出了Agent之间竞争与协作方式及投标计算方法,并在实验系统中对仿真结果进行了分析,为解决车间零件加工动态调度问题提供了一种新的方法。 相似文献