以NI軟硬體模擬頻譜分析儀之研究

The investigation of simulating spectrum analysis instrument by using NI hardware and software

周志委(Chi-Wei Chou)

指導教授 ： 黃運琳

國立虎尾科技大學/工程學院/機械設計工程研究所/碩士(2011年)

https://doi.org/10.6827/NFU.2011.00111

摘要

模態分析主要是求得結構物之模態參數，而頻率響應函數是模態分析的依據，被測物之振動信號透過頻譜分析儀運算可將頻率響應函數結果輸出，進行後續的模態分析。本論文主要是以振動原理及信號處理分析理論為依據，開發出一套模擬頻譜分析儀來進行振動模態實驗分析。本研究是以NI LabVIEW軟體為控制介面，並搭配適當之擷取硬體(NI-9233、9234)來模擬頻譜分析儀，透過NI LabVIEW軟體內建的分析程式進行運算分析，使所得的資料為模態分析軟體(ME’scope)接受進而進行曲線嵌合，計算出結構之自然模態頻率，再與現有頻譜分析儀(LDS-Photon II )和有限元素數值分析軟體進行比較。最後探討量測結構物之模態參數，來了解被測物的動態特性，進而比較模擬頻譜分析儀的完整與正確性。

關鍵字

頻譜分析儀 ； 模態分析 ； 頻率響應函數 ； NI LabVIEW ； 有限元素數值分

並列摘要

Modal analysis is mainly to obtain the modal parameters of structures. The frequency response function is also obtained and based on modal analysis. Exporting the frequency response function of vibration signals of measured objects by the spectrum analysis instrument, the modal analysis procedures can be performed. The main goal of this thesis is to use vibration and signal processing theory to develop the hardware and software to simulate the spectrum analysis instrument for vibration modal analysis. This investigation uses the NI LabVIEW software to control the interface and the appropriate acquisition hardware (NI-9233 or 9234) to act as the spectrum analysis instrument. The analysis programs are constructed by NI LabVIEW to carry out the experiment data and import the data to modal analysis software (ME'scope) to perform the curve fitting. The natural modal frequency of the structure can be calculated and compared with the existing spectrum analysis instrument (LDS-Photon II) and finite element numerical analysis softwares. Finally, the modal parameters of the experimental structures are discussed to understand the vibration characteristics of the measured objects. The integrity and accuracy of the designed spectrum analysis instrument can be verified.

並列關鍵字

spectrum analysis instrument ； modal analysis ； frequency response functions ； NI LabVIEW ； finite element numerical analysis

參考文獻

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