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一种自诊断型交流智能配电时序器的设计 被引量:1
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作者 王凤国 欧阳松 +2 位作者 陈小雷 林洋 李信 《计算机测量与控制》 北大核心 2013年第1期207-209,226,共4页
为满足交流用电仪器设备的时序要求,实现多路交流负载的无人值守配电,设计了一种基于MC9S12D64的自诊断型交流智能配电时序器;该时序器采用模块化设计,通过外围电路扩展和软件设计,实现了时序器自诊断,配电模式、配电时序设置,负载电压... 为满足交流用电仪器设备的时序要求,实现多路交流负载的无人值守配电,设计了一种基于MC9S12D64的自诊断型交流智能配电时序器;该时序器采用模块化设计,通过外围电路扩展和软件设计,实现了时序器自诊断,配电模式、配电时序设置,负载电压、电流和频率采集等功能,结合CAN总线和LabVIEW监控平台的设计,实现时序器采集数据的显示和存储;实际应用表明,该时序器的模拟量采集误差不超过1%,满足产品精度要求,此外,通用性好,运行可靠,具有良好的应用价值。 展开更多
关键词 配电时序器 自诊断 MC9S12D64 CAN总线
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基于MC9S12D64的车载直流智能配电时序器设计 被引量:1
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作者 王凤国 付进军 +1 位作者 朱小波 张春雷 《电子器件》 CAS 北大核心 2016年第6期1506-1511,共6页
为满足应急指挥车上低压直流用电仪器设备的配电时序要求,提高配电操作的灵活性,实现多路直流负载的分布式智能配电,设计了一种车载直流智能配电时序器。该时序器以MC9S12D64为平台,实现了开机时序配电,指令时序配电,供电参数监测,并联... 为满足应急指挥车上低压直流用电仪器设备的配电时序要求,提高配电操作的灵活性,实现多路直流负载的分布式智能配电,设计了一种车载直流智能配电时序器。该时序器以MC9S12D64为平台,实现了开机时序配电,指令时序配电,供电参数监测,并联或者串联扩容等功能,结合最小二乘法进行数据标定提高了监测数据精度。应用表明,该时序器信号采集误差不超过1%,实时性好,通用性强,运行可靠,应用前景广阔。 展开更多
关键词 时序器 智能配电 MC9S12D64 最小二乘法 CAN总线
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基于DCC的智能配电时序器信号采集研究与应用
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作者 王凤国 骆志伟 +1 位作者 付进军 欧阳松 《电子测量技术》 2012年第3期124-127,131,共5页
针对目前航天技术应用产品常用信号采集方法存在的不足,设计了一种基于DCC(差分调理电路)的智能配电时序器信号采集方法。通过研究差分调理电路传输特性,分析差分调理电路在交流智能配电时序器和直流智能配电时序器不同情形下信号采集... 针对目前航天技术应用产品常用信号采集方法存在的不足,设计了一种基于DCC(差分调理电路)的智能配电时序器信号采集方法。通过研究差分调理电路传输特性,分析差分调理电路在交流智能配电时序器和直流智能配电时序器不同情形下信号采集的应用情况,确立了基于差分调理电路的最优信号采集电路及采集编程算法。实际应用表明,采用差分调理电路的信号采集方式具有抑制共模,放大差模,抑制温漂,采集精度高,抗干扰能力强的优点。 展开更多
关键词 差分调理电路 智能配电时序器 信号采集
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磁带记录与时序器记录的比较
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作者 朱伟 《广播与电视技术》 北大核心 1994年第8期12-17,共6页
本文对磁带录音(磁带演播室)和时序器录音(无磁带演播室)这两种录音方式进行了比较,从中可以了解到这两种录音方式的优缺点。
关键词 磁带记录 时序器记录 演播室 记录
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利用PC584/984指令构成时序器完成电收尘落灰的振打程序
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作者 王启贤 《矿山设计研究》 1990年第3期35-36,共2页
关键词 电动机 电除尘 落灰 振打 时序器
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浅谈电源时序器在音响系统中的应用 被引量:1
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作者 李传忠 《音响技术》 2012年第5期16-18,共3页
简要说明了电源管理设备——时序器的原理及其在音响系统中的应用,设备接入注意事项,一般故障判断和处理,介绍了时序器的基本和扩展功能,时序器作为传统音响行业中新加入的一员,操作简便,实用性强,值得关注。
关键词 电源时序器 音响系统 故障排查 开关顺序 功率容量 级联 总电流 控制方式
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Prolific推出可确保信号完整性的时序优化器
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《电子质量》 2004年第6期i029-i029,共1页
关键词 Prolific公司 信号完整性 时序优化 ProTiming
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基于8051的运载器时序等效器设计
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作者 姚凯丰 姚静波 《电子世界》 2018年第13期171-172,共2页
为了测试验证新一代运载火箭箭地信息检测分析系统时序时串信号采集的时间精度、信号幅度等性能,本文设计了一种能模拟箭机产生和输出时序时串信号的等效器:采用单片机串行输出控制74HC595移位和锁存数据,利用ULN2803芯片的输出特点,接... 为了测试验证新一代运载火箭箭地信息检测分析系统时序时串信号采集的时间精度、信号幅度等性能,本文设计了一种能模拟箭机产生和输出时序时串信号的等效器:采用单片机串行输出控制74HC595移位和锁存数据,利用ULN2803芯片的输出特点,接入外接电源调节输出的电平幅度,使输出电压可达到预计的28V电压,从而输出高电平,可用于"CZ-5数字化箭地信息检测分析系统"时序信号响应电平测试试验。 展开更多
关键词 时序等效 I/O口扩展 数字化 8051单片机
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浅谈现场扩音设备的安装与调试
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作者 林余山 《电声技术》 2007年第12期74-76,共3页
主要介绍了现场扩音系统新增的音响设备,在了解其功能和作用的基础上,对其信号线的接法和信号流程作了介绍,并着重介绍了它的调试方法和调试顺序,然后对音响系统进行统一调试,以满足现场扩音的需要。
关键词 电源时序器 激励 效果 均衡 分频
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迅速成为吉他圣手——Guitar Pro3.0
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作者 寒冰 《家庭电脑世界》 2002年第1期70-71,共2页
关键词 GuitarPro3.0 时序器软件 应用软件 计算机
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基于时空双流卷积和长短期记忆网络的松耦合视觉惯性里程计 被引量:2
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作者 赵鸿儒 乔秀全 +2 位作者 谭志杰 李研 孙恒 《计算机学报》 EI CAS CSCD 北大核心 2022年第8期1674-1686,共13页
传统的松耦合视觉惯性里程计需要标定噪声和偏置等参数,而端到端学习的方法耦合性高、普适性低.因此,本文提出了一种由长短期记忆网络融合的端到端松耦合视觉惯性里程计EE-LCVIO(End-to-End Loosely Coupled Visual-Inertial Odometry)... 传统的松耦合视觉惯性里程计需要标定噪声和偏置等参数,而端到端学习的方法耦合性高、普适性低.因此,本文提出了一种由长短期记忆网络融合的端到端松耦合视觉惯性里程计EE-LCVIO(End-to-End Loosely Coupled Visual-Inertial Odometry).首先,在相机位姿和IMU融合部分,构建了一个时序缓存器和由一维卷积神经网络和长短期记忆网络相结合的融合网络;其次,为了解决现有单目深度视觉里程计难以利用长序列时域信息的问题,通过使用相邻图像对和帧间密集光流作为输入,设计了一种基于时空双流卷积的视觉里程计TSVO(Visual Odometry with Spatial-Temporal Two-Stream Networks).与DeepVO最多只能利用5帧图像信息相比,本文提出的视觉里程计可以利用连续10帧图像的时序信息.在KITTI和EUROC数据集上的定性和定量实验表明,TSVO在平移和旋转方面超过了DeepVO的44.6%和43.3%,同时,在传感器数据没有紧密同步的情况下,本文的视觉惯性里程计EE-LCVIO优于传统单目OKVIS(Open Keyframe-based Visual-Inertial SLAM)的78.7%和31.3%,鲁棒性高.与现有单目深度视觉惯性里程计VINet相比,EE-LCVIO获得了可接受的位姿精度,耦合性低,无需标定任何参数. 展开更多
关键词 视觉惯性里程计 双流融合 长短期记忆网络 松耦合 时序缓存
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An improved linear dispersion codes transmission scheme based on OSIC detection
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作者 施风 陈明 程时昕 《Journal of Southeast University(English Edition)》 EI CAS 2004年第2期139-142,共4页
Linear dispersion codes (LDCs) were originally designed based on maximum likelihood detection. They do not have good performance when using ordered successive interference cancellation (OSIC) detection. In this paper,... Linear dispersion codes (LDCs) were originally designed based on maximum likelihood detection. They do not have good performance when using ordered successive interference cancellation (OSIC) detection. In this paper,we propose a new improved linear dispersion codes transmission scheme to combat performance loss of original LDCs when using OSIC detection. We introduce an interleaver to each data substream transmitted over different antennas after LDCs encoder. Furthermore,a new computer search criterion for a linear transformation matrix is also proposed. New search criterion is to minimize the symbol error rate based on OSIC detection. Computer simulations show that the performance of proposed LDCs transmission scheme is better than the original LDCs. 展开更多
关键词 linear dispersion codes space-time codes INTERLEAVER ordered successive interference cancellation (OSIC) detection
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An Efficient Adaptive Failure Detection Mechanism for Cloud Platform Based on Volterra Series 被引量:6
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作者 LIN Rongheng WU Budan YANG Fangchun ZHAO Yao HOU Jinxuan 《China Communications》 SCIE CSCD 2014年第4期1-12,共12页
Failure detection module is one of important components in fault-tolerant distributed systems,especially cloud platform.However,to achieve fast and accurate detection of failure becomes more and more difficult especia... Failure detection module is one of important components in fault-tolerant distributed systems,especially cloud platform.However,to achieve fast and accurate detection of failure becomes more and more difficult especially when network and other resources' status keep changing.This study presented an efficient adaptive failure detection mechanism based on volterra series,which can use a small amount of data for predicting.The mechanism uses a volterra filter for time series prediction and a decision tree for decision making.Major contributions are applying volterra filter in cloud failure prediction,and introducing a user factor for different QoS requirements in different modules and levels of IaaS.Detailed implementation is proposed,and an evaluation is performed in Beijing and Guangzhou experiment environment. 展开更多
关键词 failure detection volterra filter decision tree SELF-ADAPTIVE cloud platform
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Analysis of the effect on control systems of order variation for fractional-orderPI~λD~μcontrollers 被引量:1
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作者 曾庆山 曹广益 朱新坚 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2005年第3期336-341,共6页
This paper is concerned with fractional-order PI~λD~μcontrollers. The definitions and properties of fractional calculus are introduced. The mathematical descriptions of a fractional-order controller and fractional-o... This paper is concerned with fractional-order PI~λD~μcontrollers. The definitions and properties of fractional calculus are introduced. The mathematical descriptions of a fractional-order controller and fractional-order control systems are outlined. The effects on control systems of order variation for fractional-order PI~λD~μ controllers are investigated by qualitative analysis and simulation. The conclusions and simulation examples are given. The results show the fractional-order PI~λD~μ controller is not sensitive to variation of its order. 展开更多
关键词 fractional calculus fractional-order control systems fractional-order PI~λD~μ controller characteristic polynomial
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A novel method for tracking pedestrians from real-time video
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作者 黄建强 陈祥献 汪乐宇 《Journal of Zhejiang University Science》 CSCD 2004年第1期99-105,共7页
This novel method of Pedestrian Tracking using Support Vector (PTSV) proposed for a video surveillance instrument combines the Support Vector Machine (SVM) classifier into an optic-flow based tracker. The traditional ... This novel method of Pedestrian Tracking using Support Vector (PTSV) proposed for a video surveillance instrument combines the Support Vector Machine (SVM) classifier into an optic-flow based tracker. The traditional method using optical flow tracks objects by minimizing an intensity difference function between successive frames, while PTSV tracks objects by maximizing the SVM classification score. As the SVM classifier for object and non-object is pre-trained, there is need only to classify an image block as object or non-ob-ject without having to compare the pixel region of the tracked object in the previous frame. To account for large motions between successive frames we build pyramids from the support vectors and use a coarse-to-fine scan in the classification stage. To accelerate the training of SVM, a Sequential Minimal Optimization Method (SMO) is adopted. The results of using a kernel-PTSV for pedestrian tracking from real time video are shown at the end. Comparative experimental results showed that PTSV improves the reliability of tracking compared to that of traditional tracking method using optical flow. 展开更多
关键词 Pedestrian tracking Machine learning Pyramid implementation Virtual instrument
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A test sequence generation method of zone controller based on timed automata 被引量:4
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作者 SONG Shuang CHEN Yue-dong 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2019年第3期266-276,共11页
In order to solve the problem of artificial generation and low efficiency of test sequences for zone controller (ZC), a model-based automatic generation method of test sequence is proposed. Firstly, the timed automata... In order to solve the problem of artificial generation and low efficiency of test sequences for zone controller (ZC), a model-based automatic generation method of test sequence is proposed. Firstly, the timed automata model is established based on function analysis of the zone controller, and the correctness of the model is verified by UPPAAL. Then by parsing the timed automata model files, state information and transition conditions can be extracted to generate test case sets. Finally, according to the serialization conditions of test cases, the test cases are serialized into test sequences by using the improved depth first search algorithm. A case, the ZC controls the train running within its jurisdiction, shows that the method is correct and can effectively improve the efficiency of test sequence generation. 展开更多
关键词 test sequence zone controller (ZC) timed automata model file parsing case serialization
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Discussion About Nonlinear Time Series Prediction Using Least Squares Support Vector Machine 被引量:3
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作者 XURui-Rui BIANGuo-Xin GAOChen-Feng CHENTian-Lun 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第6期1056-1060,共5页
The least squares support vector machine (LS-SVM) is used to study the nonlinear time series prediction. First, the parameter gamma and multi-step prediction capabilities of the LS-SVM network are discussed. Then we e... The least squares support vector machine (LS-SVM) is used to study the nonlinear time series prediction. First, the parameter gamma and multi-step prediction capabilities of the LS-SVM network are discussed. Then we employ clustering method in the model to prune the number of the support values.. The learning rate and the capabilities of filtering noise for LS-SVM are all greatly improved. 展开更多
关键词 least squares support vector machine nonlinear time series PREDICTION CLUSTERING
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An improved spectral performance of SPWM inverter based on the time-sequence of chaos
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作者 李冠林 陈希有 +1 位作者 刘洪臣 杨伟 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2007年第1期59-63,共5页
A novel approach for improving the spectral performance of sinusoidal Pulse Width Modulation (SPWM) inverter is presented. By varying the carrier frequency according to chaotic time-sequence, the discrete spectrum of ... A novel approach for improving the spectral performance of sinusoidal Pulse Width Modulation (SPWM) inverter is presented. By varying the carrier frequency according to chaotic time-sequence, the discrete spectrum of the output voltage is transformed into the continuous spectrum, which could reduce the acoustic noise concentrated at specific tones in an inverter-driven electric machine. Fourier analysis shows that the harmonic at the fixed frequency has been restrained effectively and the distribution of the spectrum is in a wider range. Besides, a novel variable is introduced for the evaluation of the output voltage spectrum in SPWM inverter. Simulations and experiments with DSP confirm the advantages of the novel approach. Experimental results show the annoying acoustic noise has been translated into some enjoyable sound like a fall or water flowing when this novel method is applied. 展开更多
关键词 INVERTER SPWM HARMONIC time-sequence CHAOS
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Effect of Sludge Retention Time on Nitrite Accumulation in Real-time Control Biological Nitrogen Removal Sequencing Batch Reactor 被引量:7
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作者 吴昌永 彭永臻 +2 位作者 王淑莹 李晓玲 王然登 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2011年第3期512-517,共6页
In this study,four sequencing batch reactors(SBR),with the sludge retention time(SRT)of 5,10,20 and 40 d,were used to treat domestic wastewater,and the effect of SRT on nitrite accumulation in the biological nitrogen ... In this study,four sequencing batch reactors(SBR),with the sludge retention time(SRT)of 5,10,20 and 40 d,were used to treat domestic wastewater,and the effect of SRT on nitrite accumulation in the biological nitrogen removal SBR was investigated.The real-time control strategy based on online parameters,such as pH,dissolved oxygen(DO)and oxidation reduction potential(ORP),was used to regulate the nitrite accumulation in SBR. The model-based simulation and experimental results showed that with the increase of SRT,longer time was needed to achieve high level of nitritation.In addition,the nitrite accumulation rate(NAR)was higher when the SRT was relatively shorter during a 112-day operation.When the SRT was 5 d,the system was unstable with the mixed liquor suspended solids(MLSS)decreased day after day.When the SRT was 40 d,the nitrification process was significantly inhibited.SRT of 10 to 20 d was more suitable in this study.The real-time control strategy combined with SRT control in SBR is an effective method for biological nitrogen removal via nitrite from wastewater. 展开更多
关键词 biological nitrogen removal nitrite accumulation real time control sludge retention time sequencing batch reactors
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Trispectrum and correlation dimension analysis of magnetorheological damper in vibration screen 被引量:1
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作者 吴福森 黄宜坚 +1 位作者 黄凯 徐姗 《Journal of Central South University》 SCIE EI CAS 2012年第7期1832-1838,共7页
In order to improve the screening efficiency of vibrating screen and make vibration process smooth,a new type of magnetorheological (MR) damper was proposed. The signals of displacement in the vibration process during... In order to improve the screening efficiency of vibrating screen and make vibration process smooth,a new type of magnetorheological (MR) damper was proposed. The signals of displacement in the vibration process during the test were collected. The trispectrum model of autoregressive (AR) time series was built and the correlation dimension was used to quantify the fractal characteristics during the vibration process. The result shows that,in different working conditions,trispectrum slices are applied to obtaining the information of non-Gaussian,nonlinear amplitude?frequency characteristics of the signal. Besides,there is correlation between the correlation dimension of vibration signal and trispectrum slices,which is very important to select the optimum working parameters of the MR damper and vibrating screen. And in the experimental conditions,it is found that when the working current of MR damper is 2 A and the rotation speed of vibration motor is 800 r/min,the vibration screen reaches its maximum screening efficiency. 展开更多
关键词 screening efficiency vibration screen magnetorheological (MR) damper autoregressive (AR) time series trispectrumslices correlation dimension
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