【正文】 ....................................................................1 課題背景 .....................................................................................................................1 研究內(nèi)容 .....................................................................................................................1 目前該領(lǐng)域的研究現(xiàn)狀 .............................................................................................1 運行環(huán)境 .....................................................................................................................1第二章 設(shè)計需求分析 ...............................................................................................................5 硬件實現(xiàn) ....................................................................................................................5 信號分析理論 .............................................................................................................8 聲卡的可行性分析 .....................................................................................................9 信號分析系統(tǒng)設(shè)計方案比較 ...................................................................................10 模塊化編程思想 .......................................................................................................11第三章 系統(tǒng)設(shè)計方案 .............................................................................................................13 程序設(shè)計流程圖 .........................................................................................................13 系統(tǒng)功能介紹 .............................................................................................................14 基本參數(shù)設(shè)定 ................................................................................................................15 前面板設(shè)計 .....................................................................................................................16 軟件程序設(shè)計 ................................................................................................................17 信號分析處理 .............................................................................................................23 時域分析 .........................................................................................................................23 頻域分析 .........................................................................................................................25第四章 風(fēng)扇故障檢測設(shè)計調(diào)試與運行 .................................................................................28 運行 VI.....................................................................................................................28 調(diào)試 VI.....................................................................................................................28 實驗測試結(jié)果 ..........................................................................................................30 試驗結(jié)果分析 ..........................................................................................................38第五章 總結(jié) .............................................................................................................................39 總結(jié) ...........................................................................................................................39 展望未來 ...................................................................................................................39參考文獻 ...................................................................................................................................41附錄 ...........................................................................................................................................43致 謝 .........................................................................................................................................44 第一章 引言 課題背景為了確保產(chǎn)品的高質(zhì)量，每臺風(fēng)扇出廠前都要進行參數(shù)檢測，在規(guī)?；a(chǎn)的今天，風(fēng)扇檢測線是目前大部分風(fēng)扇生產(chǎn)廠家采用的出廠檢測方式。 LabVIEW。 關(guān)鍵詞：音頻信號；虛擬儀器；LabVIEW；故障檢測；聲音數(shù)據(jù)采集Fan Fault Detection System based on the Virtual Instrument AbstractFan fault detection is widely used in the fan production process. At present, the methods used widely are vibration diagnosis technology and audio diagnosis technology, but vibration diagnosis technology is noncontact measurement so we need to overe test line of body vibration influence.This paper adopted the audio fault diagnosis system based on virtual instrument, and constructed a flexible function of fault diagnosis system with high precision and low cost.It can be applied from the two sides of hardware and application software design to plete the system design based on the function fault diagnosis and virtual instrument design method. First ,on the premise to ensure system reliability and feasibility ,the special data acquisition card for data acquisition was instead by the owe sound card of puter ,to achieve an sampling accuracy of kHz ,depth of sampling 16 bit ,to acquire the fan acoustic signal the realtime data.Then, several applications programs, such as signal analysis, signal inputoutput, data storage and processing act. And human machine interface were plete in LabVIEW platform. .And it implemented the realtime data acquisition and display, harmonic distortion analysis, short and window handle, and other function in one of the fault detection system design.It has been tested that the system could meet the needs of the fault detection system, with the feature of low cost, detection convenient, stable and reliable of performance. With broad application prospect, it can be applied to voice recognition, environmental noise monitoring, laboratory measurement research field etc.Key words： audio signal。然后，在 LabVIEW 平臺下完成信號顯示，信號分析，信號輸入輸出，數(shù)據(jù)保存與處理等應(yīng)用程序和人機交互界面設(shè)計，完成音頻信號的實時采集與顯示，諧波失真分析，短時加窗處理等多種功能于一體的故障檢測系統(tǒng)設(shè)計。在系統(tǒng)設(shè)計上，結(jié)合故障診斷的功能和虛擬儀器的設(shè)計方法，從硬件和軟件方面張開系統(tǒng)設(shè)計。內(nèi)蒙古科技大