【正文】 () uk Δ is controller39。 () uk is controller39。 iT is integrating time constant。 analog DBL singlechannel singlesampling.Figure 2. block diagram of acquisition card reading analog signalIV. PID CONTROL TOOLKIT In the vibration test system, PID control module mainly uses PID toolkit to plete its work, which is the application on the engineering control provided by NI Company. The PID tool bag joins the plex control algorithm in the LabVIEW procedure, unifies the PID control tool bag and the LabVIEW arithmetic and the logical function to generate automatic control program quickly. Because control based on the hypothesized instrument is one kind of sampling control, which is according to the sampling time deviation amount putation to control quantity. Therefore it can only use the numerical calculus to approach. That is in the sampling time t, PID controller may total the putation proportion, the differential, the integral three functions together to obtain the PID controller39。 VIreading is set to analog 2D DBL, Nchannel N sampling mode。 starttriggerring mode is set to analog edge mode。 furthermore, this operating mode exhausts memory and causes the system to run the case of data loss. As a result, when writing programs in the application of DAQmx, VI Server technology is utilized where VI is called dynamically to realize the effective running of program. The followings are on the analog and digital acquisition, and analog output of the programming method and the module configuration to do in detail. Four force sensors output 010V analog signals and the block diagram of acquisition card reading the force sensor analog signal and the virtual channel settings are as follows: DAQmx Virtual Channel is set to AIvoltage analog input, Dev1/ai0 selected to the physical channel。 longdistance puter in control studio controls the hostputer to manipulate testing platform through DataSocket technology. III. DATA ACQUISITION SYSTEM Acquisition of multipath digital signal and simulation signal are realized by multifunctional data acquisition card PCI6229, as well as the output of motor drive simulation signal. NI PCI6229 is a type of data acquisition card based on puter PCI bussing technique, which belongs to M series cards. Its speed rate of data transmission is increased five times more than before and system architecture time is short. Basic parameter of NI PCI6229 follows: sampling speed rate at 250Ks/s, 16bit 32line simulation input channel, 16bit 4line simulation output (833KS/s), 48line digital I/O (32 lines can get maximum of 1MHZ), A/D convertor with 16line resolution, supporting digital triggering, two 32line counter, one frequency generator, patible with NI DAQmx drive procedure and testing software. The function of DAQmx data acquisition card is shown in rear panel of LabVIEW, ALL Function /NI Measurements / DAQmx, after installing drive of PCI6229 acquisition card properly. It contains all subVI that collocation acquisition needs. Here, it contains configuration access functions, taskstarting functions and datareading functions and so on. Analog amp。 at the same time it improves program quality. II. SYSTEMS GENERAL DESIGN There are three parts in telemetering and mand system of vibration platform: vibration testing laboratory platform and drive, data collection, remote telemetering and mand. The system structure is shown in figure 1. Figure 1 block diagram of remote telemetering and mand system of vibration platformIn vibration platform controlling system, the motion of platform is drived by linear motor. The position and velocity signals of linear motor are given by code device in linear motor. Each linear motor outputs three pairs of difference signals, A, A+, B, B+, Z, Z+, namely threeline digital signals. So there are nineline digital signals for three linear motors. These signals are read by I/O port of PCI6229 collection card, transferred to puter interior by bus circuit, generated to drive signals through PID algorithm. Drive signals are delivered to drive device of linear motors to control the motion of linear motors. Here, motor drive signals are 010V simulation signals which are outputs from AO channel of collection card according to algorithm. There are four force sensors to be assembled on vibration laboratory platform, which are used to measure vibration of the platform aiming to observe vibration performance of the platform. The signal from force sensor is gathered to the controlling device through AI channel to be shown and attached to algorithm calculation. As the surroundings of vibration testing locale is bad and noise is paratively loud, given to the testing security, the whole system runs in V4159 978142448109 /10/$ 169。 Data Acquisition。 PID Control Toolkit。 ExpositionCopyright 2002, American Society for Engineering Education．3639.[23] National Instruments Corporation. LabVIEW Function and VI ReferenceManual. Number 321526B01 January 19987102.[24] Nationl Intruments Corporation. Using LabVIEW with TCP/IP and Intruments Application Note 160. .[25] , Transfer Protocal HTTP/ ，1999:357363.[26] . Internet working with TCP/IP. PrenticeHall，Englewood Cliffs，NJ，1995,3,521～527.[27] GOLDBERG H. What is Virtual Instrument[ J ]. IEEE Instrumentation amp。三年來，周老師除了在學(xué)習(xí)上給了我們很大鼓勵和支持，在生活上也給了我們很大關(guān)心和幫助，值此畢業(yè)際，我向周老師表示深深的敬意和感謝！然后，我還要感謝在我們實(shí)驗(yàn)室的所有師弟師妹，他們對我的課題工作給予了很大的支持和幫助。在整個畢業(yè)設(shè)計(jì)期間，周老師傾注了很大的精力和心血，從論文的選題、開展、調(diào)研到設(shè)計(jì)調(diào)試階段，周老師都給予了很大指導(dǎo)和啟發(fā)，使的我的課題任務(wù)能順利完成。致謝本課題是在我的導(dǎo)師周建民博士的悉心指導(dǎo)下完成的。基于虛擬儀器的遠(yuǎn)程測試系統(tǒng)除了具備虛擬儀器的優(yōu)點(diǎn)外，主要優(yōu)勢還在于用戶可以不受時間、地點(diǎn)和環(huán)境的限制，遠(yuǎn)程完成測試任務(wù)；同時實(shí)現(xiàn)了資源共享，降低成本，許多昂貴的硬件設(shè)備的某些功能可以通過軟件完成；有些復(fù)雜的任務(wù)還可以通過網(wǎng)絡(luò)協(xié)同工作，共同完成?；谔摂M儀器的遠(yuǎn)程測試系統(tǒng)主要以現(xiàn)場虛擬儀器為核心，利用 Internet 網(wǎng)絡(luò)技術(shù)設(shè)計(jì)的一個可擴(kuò)展、易維護(hù)的具有遠(yuǎn)程監(jiān)控、遠(yuǎn)程數(shù)據(jù)采集、遠(yuǎn)程數(shù)據(jù)傳輸功能的綜合網(wǎng)絡(luò)測試平臺，使遠(yuǎn)程用戶在能夠通過瀏覽器登錄測試平臺，在授權(quán)情況下對服務(wù)器端測試設(shè)備進(jìn)行程監(jiān)控，并通過下載客戶端應(yīng)用程序，與服務(wù)器建立網(wǎng)絡(luò)連接，獲取測試數(shù)據(jù)。另外，隨著信息網(wǎng)絡(luò)技術(shù)的不斷深化，網(wǎng)絡(luò)信道容量和網(wǎng)絡(luò)速度將不再成為網(wǎng)絡(luò)應(yīng)用的障礙，利用Internet進(jìn)行遠(yuǎn)程診斷、遠(yuǎn)程教學(xué)、遠(yuǎn)程控制等已成為人們十分關(guān)注的問題。（4）調(diào)試時，由于實(shí)驗(yàn)室的網(wǎng)絡(luò)出現(xiàn)問題，遠(yuǎn)程客戶端得程序無法訪問服