数据采集外文翻译

1、中文1950字附录A外文资料Data CollectionAt present,the management of China colleges and universities apartments are develop ing toward sta ndardizati on and market developme nt,accide nts have occurred in electricity,while some colleges and uni versities have in stalled apart ment energy metering control syste

2、m,however,thesesystems monitor the prevale nce of low level,billing accuracy is low,electricity-sharing,the network number o f the drawbacks of low extent.Therefore, improving the Energy Measurement m on itori ng device has become more urge nt. The issue of stude nt hostels in colle ges and universi

3、ties to monitor energy metering system to study, design the st udent hostels in colleges and universities of the electricity data collector apartm ent.Data acquisition, also known as data acquisition, is the use of a device th at collect data from outside the system and en ter into an in terface wit

4、hin the s ystem.Data acquisiti on tech no logy is widely cited in the various fields.Such as camera, microph one, all data collectio n tools.Data is being collected has bee n c on verted to electrical sig nals of various physical qua ntities such as temperature, water level, wind speed, pressure, et

5、c., can be analog, it can be digital.Sampl e collecti on gen erally means that a certa in time in terval (called the sampli ng p eriod) to repeat the same point of data collect ion. The data collected are mostly instantaneous value, but also a feature within a certain period of time value.A ccurate

6、data measureme ntis the basis for data collect ion .Data measureme nt met hod of con tact and non-con tact detecti on eleme nts varied.Regardless of which method and components are measured object does not affect the status and me asurement environment as a precondition to ensure the accuracy of the

7、 data.Ver y broad mea ning of data collect ion, in clud ing con ti nu ous physical hold the coll ection across the state .In computer-aided mapp ing, survey ing and mapp ing, desi gn, digital graphics or image data acquisition process may also be called, this time to be collected is the geometric vo

8、lume (or include physical quantities, su ch as gray)data.1 In todays fast-grow ing In ternet in dustry, data collectio n has been widely used in the field of Internet and distributed data acquisition field has undergone important changes.First, the distributed control applications in i ntelligent da

9、ta acquisition system at home and abroad have made great progres s.Second, the bus-compatible data acquisition plug-in number is increasing, and personal computer-compatible data acquisition system the number is increasing. Various domestic and international data collection machine has come out, the

10、 d ata acquisition into a new eraDigital signal processor (DSP) to the high-speed data processing ability an d stro ng peripherals in terface, more and more widely used in power quality an alysis field, in order to improve the real-time and reliability.The DSP and micr ocomputer as the center of the

11、 system, realize the power system signal collecti on and analysis. This paper based on the FFT algorithm with window interpola tion electric system harmonic analysis, improves the accuracy of the power qua lity parameters. In electricity parameter acquisition circuit, by highaccuracy tran sformer an

12、d improve software synchronous com muni catio n sampli ng method to con duct electricity parameters of the acquisiti on.The system consists of two main components, mainly complete data acquis ition and logic control.To synchronous sampling and A/D converter circuit pri ority . The DSP development bo

13、ard(SY-5402EVM),complete data processing. T HE signal after transformer, op-amp into A/D converter, using DSP multi -chann el buffer (McBSP) and serial port (A/D connected, data collection and operatio ns. At the same time, adopt PLL circuit implementation synchronous sampling, can prevent well due

14、to sampling synchronization and cause the measuring err or. The overall system diagram of the A/D converter chooses the Analog to pr oduce stats redetect (AD) compa ny AD73360. The chip has six an alogue in put channel, each channel can output 16 the digital quantity. Six channel simultan eous sampl

15、ing, and conversion, timeshare transmission, effectively reduce gener ated due to the sampling time different phase error. SY - 5402EVM on-board DSP chip is TI companys 16 fixed -point digital signal processor TMS320VC54 02. It has high costperforma nce and provide high-speed, bidirect ion al, multi

16、-cha nnel belt cushion, be used to serial port with system of other serial devices di rectly interface.The realization method of ac sample：In the field of power quality analysi s,The fast Fourier transform (FFT) algorithm analysis of electric system harmon ic is commonly used.and the FFT algorithm t

17、o signal a strict requirements syn chronous sampling. The synchronous sampling influence: its difficult to accomp lish synchronous sampling and integer a period truncation in the actual measur ement, so there was a affect the measurement accuracy of the frequency spectr um leakage problem. The signa

18、l has to deal with through sampling and A/D c onversion get limited long digital sequence,theoriginal signal multiplied by A r ectangular window to truncated. Time-domain truncation will cause the detuning frequency domain, spectrum leakage occurs. In the synchronous sampling, bec ause the actual si

19、gnal every harmonic component cant exactly landed in freque ncy resolution point in, but fall between the frequency resolution points. But F FT spectrum is discrete, only in all sampling points, while in other places of s pectrum is not. Such through FFT and cannot directly get every harmonic com po

20、nent, but only the accurate value in neighboring frequency resolution point v alue to approximate instead of, can cause the fence effect error.The realization method of synchronous sampling signal：According to provide different ways of sampling signal, synchronous sampling method and divided into so

21、ftware sync hronous sampling method and hardware synchronous sampling method is two k inds. Software is synchronous sampling method by micro controller (MCU) or DSP provide synchronized sampling pulse, first measured the measured signal, the sampling interval period T A T = T/N (N for week of sampli

22、ng points), T hus the count value determined timer,Use timing interrupt way realization sync hronous sampling. The advantage of this method is no hardware synchronous c ircuit, simple structure .This topic will be the eventual realization of access to embedded systems，the realization of the power me

23、asurement and monitoring,m onitoring system to meet the electricity network,intelligence requirement,it prom ote the development of remote monitoring services,bringing a certain degree of socio.economic effectiveness.On the fundamental reactive current and harmonic current detection, thereare mainly

24、 2 ways: First, the instantaneous reactive power theory based method,the second is based on adaptive cancellation techniques.In addition, there areFrom:Principles of Data Acquisitioother non-mainstream approach, such as fast Fourier transform method, wavelet tran sform.Instantaneous power theory bas

25、ed on the method of offensive principles ar e: a three-phase curre nt detecti on and load phase voltage A, the coord in ate tra n sformati on, two-phase statio nary coord in ate system the curre nt value, calculate the instantaneous active and instantaneous reactive power ip iq,then after coor din a

26、te tran sformatio n, three-phase fun dame ntal active curre nt, with the final loa d curre nt minus the fun dame ntal curre nt, active power and harm onic curre nts a re fun dame ntal iah, ibhi, ich.数据采集目前，我国高校公寓管理正在向着正规化、 市场化发展， 在不断提高学生方 便用电的同时，用电事故频有发生， 虽然部分高校公寓已经安装了电能计量监控 系统，但这些系统普遍存在着监控程度低、计费精度不

27、高、电费均分、网络程度 低等诸多端。 因此，对于电能计量监控装置的改进变得更加紧急。 本课题以高校 学生公寓宿舍电能计量监控系统为研究对象， 设计了对学生公寓的电能数据采集 器。数据采集， 又称数据获取， 是利用一种装置， 从系统外部采集数据并输入到 系统内部的一个接口。数据采 集技术广泛引用在各个领域。比如摄像头，麦克 风，都是数据采集工具。被采集数据是已被转换为电讯号的各种物理量，如温度、水位、风速、压力 等，可以是模拟量，也可以是数字量。采集一般是采样方式，即隔一定时间（称 采样周期） 对同一点数据重复采集。 采集的数据大多是瞬时值， 也可是某段时间 内的一个特征值。 准确的数据量测是数

28、据采集的基础。 数据量测方法有接触式和 非接触式， 检测元件多种多样。 不论哪种方法和元件， 均以不影响被测对象状态 和测量环境为前提， 以保证数据的正确性。 数据采集含义很广， 包抱对面状连续 物理量的采集。在计算机辅助制图、测图、设计中，对图形或图像数字化过程也 可称为数据采集，此时被采集的是几何量（或包括物理量，如灰度）数据。在互 联网行业快速发展的今天， 数据采集已经被广泛应用于互联网及分布式领域， 数 据采集领域已经发生了重要的变化。 首先，分布式控制应用场合中的智能数据采 集系统在国内外已经取得了长足的发展。其次 ,总线兼容型数据采集插件的数量 不断增大 ,与个人计算机兼容的数据采

29、集系统的数量也在增加。国内外各种数据 采集机先后问世，将数据采集带入了一个全新的时代。数字信号处理器（DSP）以其高速的数据处理能力和强大的外设接口，越来 越广泛地被使用于电能质量分析领域， 以提高系统的实时性和可靠性。 本系统以 DSP和单片机为心，实现了对系统中信号的采集和分析。 本文采用基于加窗插值 的 FFT 算法分析系统谐波，提高了各项电能质量参数的准确性。在电能参数采 集电路中，采用高精度的互感器和改进的软件同步交流采样方法进行电力参数的 采集。系统硬件由两大部分组成， 主要完成数据采集和逻辑控制任务， 以同步采样 和A/D转换电路为主。一块DSP开发板（SY-5402EVM），完成数据的处理。信号 经过互感器、运放送入 A/D转换器，利用DSP的多通道缓冲串口（ McBSP）与 A/D 相连，进行数据的采集和运算。同时，采用锁相环电路实现同步采样，能很 好地抑制由于采样不同步而造成的测量误差。系统总体框图这里的 A/D 转换器 选用的是Analog Devices（AD）公司的AD73360。该芯片具有六个模拟量输入通道， 每个通道可以输出 16 位的数字量。六通道同时采样，同时转换，分时传输，有 效地减