共查询到19条相似文献,搜索用时 218 毫秒
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在传统PI控制微纳操纵成像系统的基础上实现参数实时在线调整。为了获得更好的控制效果,进行了自适应模糊PI控制的微纳操纵成像系统仿真研究。运用探针与样品之间原子力保持不变的原理对微纳操纵成像系统动态过程进行建模,加入模糊PI控制模块,建立了一套完整的系统仿真平台。设计了一种自适应模糊PI控制器,该控制器通过对电压值的误差和误差变化的判断进行模糊化推理,实现对控制参数的实时在线整定,以达到优化控制的目的;同时,利用Matlab进行仿真研究。结果表明,自适应模糊PI控制算法比传统PI控制算法能有效地改善系统的动态性能和稳态性能。 相似文献
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为了实现集中供热系统数据的远程实时在线监测及用户流量的远程调节,设计并实现了基于NB_IOT技术与传统集中供热系统终端控制相结合的供热远程监测系统。以STM32与NB_IOT模块相结合的控制方式,实时采集用户室内温湿度、供热流量调节阀状态及管道内温度等重要参数,以阿里云为设备云平台,对远程监控系统进行开发,实现数据的实时采集、处理及上传,通过电脑端或手机端可以在线监测数据状态和远程调节流量。实验结果表明,系统可根据需求设计数据监测类型,实现远程监测供热系统的运行状态及调节流量。 相似文献
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在激光雷达系统中,受限于被测目标距离及反射特性的变化,回波信号的峰值动态范围大,导致由恒比定时鉴别电路确定的回波到达时刻波动较大,产生的行走误差影响了系统的测距精度和测量范围。设计了一种带自适应增益控制的恒比定时鉴别电路,基于回波信号水平快速自动调节放大电路的增益,可适应较大动态范围下的目标测量。实验结果表明,采用自动增益与恒比鉴别电路相结合的方法设计的激光雷达时刻鉴别电路,可以基于回波信号水平在25ns的时间范围内实现放大电路增益的自适应调节;当输入信号上升时间为3ns、电压动态范围为29dB时,利用增益的自动控制可以将回波信号的动态范围降低至9dB,将回波时刻鉴别误差控制在0.42ns内,有效减小了测距系统的行走误差。 相似文献
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时间序列预报法在供热控制中的应用研究 总被引:5,自引:0,他引:5
为了节能和优质供热,提出将负荷预报和预测控制施加于供热系统中.文中首先介绍了时间序列法预报原理,接着应用该原理给出供热负荷和模型误差的预报.负荷预报作为供热系统的设定值,模型误差作为预测控制的校正量.最后,给出了两种预报方法在供热系统的应用及仿真结果. 相似文献
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自适应动态寻优控制系统仿真研究 总被引:1,自引:0,他引:1
对采用自适应动态寻优方法的极值调节控制系统进行仿真研究,其目的是为解决在工业生产过程中若采用传统的动态寻优方法就必须准确地辨识极值调节控制对象线性部分的参数这一无法回避的难题.对参数飘移的极值调节控制系统进行仿真研究,仿真结果表明,采用自适应动态寻优方法对极值调节控制对象线性部分模型的先验知识要求很少,只需要知道极值调节控制对象的线性部分的阶数就足够了,在动态寻优的过程中不仅能够自动辨识控制对象的参数,而且还能够自动适应参数的飘移.从而可得出如下结论:在实际工业生过程中,若采用自适应动态寻优方法,根本不需要辨识极值调节控制对象线性部分的参数,而且还能够自动适应参数的飘移.从而能有效地保证控制系统运行的连续性与稳定性.因此采用自适应动态寻优方法的极值调节控制系统将会在实际工业生产过程中发挥其强大的控制功能. 相似文献
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热网全网平衡系统主要通过获得换热站内的二次网供水温度、二次网回水温度、一次网电动阀门的反馈值和设定值等参数,以及热源的温度、压力、流量等参数,采用神经网络、数据回归等算法,控制一次网电动阀门的动作,从而减小热网的水平水力失调度,达到均匀供热和节约能源、增加经济效益的目的。全网平衡系统采用均匀性控制策略,调节换热站的一次网电动阀门或分布式变频泵,使每个热力站的供热效果基本一致、冷热均匀,同时消除了一次网的时延产生的参数不同步所造成的二次网参数不同步的失调现象,有效地保证了热网的同步负荷调节,规避了系统的容量、惯性、时延特性,是合理、有效的系统调节和全网平衡策略。 相似文献
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文中所设计的基于PLC控制的恒压供风系统能对矿井的供风系统进行改善。它是以PLC与变频器为核心构成的双闭环系统,实时监测网管压力、空气质量和变频器控制电机的转速情况,再经PID的运算、调节。通过PLC自动控制电机的变频运行和工频运行的切换,以及投入电机的台数,达到电机的高效、节能、安全的运行要求,提高矿井中的供风质量。 相似文献
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Energy minimization using multiple supply voltages 总被引:1,自引:0,他引:1
Jui-Ming Chang Pedram M. 《Very Large Scale Integration (VLSI) Systems, IEEE Transactions on》1997,5(4):436-443
We present a dynamic programming technique for solving the multiple supply voltage scheduling problem in both nonpipelined and functionally pipelined data-paths. The scheduling problem refers to the assignment of a supply voltage level (selected from a fixed and known number of voltage levels) to each operation in a data flow graph so as to minimize the average energy consumption for given computation time or throughput constraints or both. The energy model is accurate and accounts for the input pattern dependencies, re-convergent fanout induced dependencies, and the energy cost of level shifters. Experimental results show that using three supply voltage levels on a number of standard benchmarks, an average energy saving of 40.19% (with a computation time constraint of 1.5 times the critical path delay) can be obtained compared to using a single supply voltage level 相似文献
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To reduce energy consumption while maintaining users’ Quality of Service (QoS) in Orthogonal Frequency Division Multiplex Access (OFDMA) relay-enhanced networks, an adaptive energy saving subcarrier, bit and power allocation scheme is presented. The optimal subcarrier, bit and power allocation problems based on discrete adaptive modulation and coding scheme have been previously formulated for relay-enhanced networks, and have been reformulated into and solved by integer programming in optimization theory. If the system still has a surplus of subcarriers after resource allocation, we carry out Band- width Exchange (BE) to enable more subcarriers to participate in transmission to save energy. In addition, as the relay selection scheme is closely linked with resource allocation, a heuristic energy saving relay selection scheme is proposed. Simulation results indicate that the proposed algorithm consumes less energy when transmitting the same number of bits than greedy energy saving schemes, although its spectrum efficiency is worse. 相似文献
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亮度调节是目前隧道照明控制系统兼顾安全性与节能性的主要应用方式。针对隧道照明控制系统光源调节方式单一、难以满足人眼视觉效应需求的问题,设计了一套基于LED光色动态可调的隧道照明控制系统。首先以暖白光、绿光、冷白光为三基色,推导出三通道PWM调光的光色动态调节模型;其次根据系统总体架构,对硬件电路进行具体设计与选型,同时完成上位机控制平台和下位机色温调节程序的开发;最后搭建控制系统实验平台对LED光色动态调节效果进行模拟验证。实验结果表明:上位机能准确输出控制指令控制LED光源实现隧道不同路段光色动态调节。 相似文献
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Jianwei Wang 《International Journal of Wireless Information Networks》2018,25(3):269-278
Aim at improving the energy saving and transmission efficiency of directional drilling rig, the load sensing technology and constant-pressure variable technique are adopted to enable the system to provide the required pressure and flow rate according to the load variation. In order to research the dynamic characteristics of hydraulic control systems, the background and working principle of the load sensing technology were introduced. The dynamic mathematical model of load sensing system is established based on the hydraulic principle. The directional drilling rig mainly consists of two basic circuits: rotary circuit and feed circuit. The dynamic characteristics of rotary circuit are mainly studied. In addition, the hydraulic system of kilometres directional rig is simulated with the software of AMESim. The simulation results show that the load sensing pump could output its required flow and outlet pressure adapted to the load pressure in real time, thus effectively improving the efficiency of the hydraulic system. Furthermore, to verify the validity of the mathematical model and the simulation analysis, an experimental platform of the load sensing hydraulic system was built. The dynamic performance test of load sensing hydraulic system was performed by using the platform. The experimental results demonstrated that the load sensing hydraulic system could output its required flow and pressure when the working condition changed. Finally, they also illustrate the validity of the proposed approach. 相似文献