隨著計(jì)算機(jī)技術(shù)的飛速發(fā)展，虛擬儀器在自動(dòng)測試及自動(dòng)化領(lǐng)域起著越來越重要的角色。本文的動(dòng)平衡測試系統(tǒng)采用LabView 軟件及其數(shù)據(jù)采集卡NI DAQ－6221，實(shí)現(xiàn)對(duì)凸輪軸轉(zhuǎn)速的精確控制和其振動(dòng)信號(hào)的實(shí)時(shí)采集與動(dòng)態(tài)性能的分析。系統(tǒng)主要有PC 機(jī), 數(shù)據(jù)采集卡NI DAQ－6221,單向交流調(diào)壓模塊，電渦流位移(轉(zhuǎn)速)傳感器和凸輪軸動(dòng)特性試驗(yàn)平臺(tái)組成。充分利用Labview 的強(qiáng)大計(jì)算分析功能和虛擬儀器過程控制技術(shù)（實(shí)現(xiàn)帶通濾波器，PID 控制及參數(shù)整定）使整個(gè)控制系統(tǒng)具有優(yōu)良的控制精度和穩(wěn)定性。系統(tǒng)利用Labview 平臺(tái)編程，具有研制周期短，開發(fā)成本低，性能可靠，界面友好，易于功能擴(kuò)展等優(yōu)點(diǎn)。
關(guān)鍵詞 調(diào)壓模塊帶通濾波參數(shù)整定 PID 控制虛擬儀器
Abstract: With the development of computer technology, Virtual Instrument (VI) is playing a very important role in measurement, test and automation. In this paper, a dynamic balance testing system which includes PC, DAQ Card (PCI-6221) board, voltage regulating modulation ，and Position and velocity sensors, is presented. We take advantage of the computing and analyzing function of Labview and technology (band-pass filter, the incremental PID control and parameter adjustment) of process control to realize the real-time data acquisition and analyses of vibrating signals and the accurate control of speed of camshaft. The accuracy and stability of the whole control system has been proved satisfactory. The system software has been developed by Labview, which offers the system a lot of merits, such as friendly user interface, high development cost, short development period, and flexible functional-extension, etc.
Key words：voltage regulating modulation，band-pass-filter, parameters adjustment, PID control, virtual instrument