ambient vibration 中文意思是什麼
ambient vibration
解釋
環境振動-
3. the frequency differences are determined by both the power spectral density ( psd ) and cepstrum of ambient vibration measurements. a matlab - based toolbox is developed, in which the differences of the higher adjacent frequencies can be easily evaluated
3 .使用功率譜頻差法和倒頻譜頻差法，開發了基於matlab平臺的斜拉索環境振動基頻識別gui工具箱。 -
The thesis is aimed at presenting a procedure to establish a baseline finite element model of the qingzhou cable - stayed bridge over the ming river, fuzhou, china that was newly constructed. its main span length of 605m is the longest in the world among the completed composite - deck cable - stayed bridge. the proposed procedure includes several tasks : initial finite element modeling base on the design drawings, field loading tests and ambient vibration tests, and finite element model calibration with the test results
本文以主跨605m的結合梁斜拉橋? ?青洲閩江大橋為背景，首先根據設計圖紙建立該橋完整的初始空間有限元模型，然後根據通車前現場靜力試驗和環境振動試驗結果對初始有限元模型進行校正，通過參數的調整使模型靜、動力計算結果與實測值吻合。 -
A method of online damage identification for structures based on ambient vibration
結構振動誘導流場及附加質量的數值分析 -
As a classical and practical method in ambient vibration experimental modal analysis, auto - cross spectrum density method replace the frequency response function with power spectrum and achieve its mode shape from transmissibility between the response signals and reference signal
自互譜法作為環境激勵實驗模態分析的一種實用的經典方法，用響應點和參考點間的功率譜曲線來代替頻響函數曲線，並由響應點和參考點之間響應的傳遞率得出振型。 -
1. capacitor installation is sorted into indoor and outdoor type. the ambient temperature range for capacitor installation and operation : - 40 b. there should be no corrosive gas, steam, conductive explosive dust and strong vibration exist at installation site
1 .裝置分為戶內櫃式和戶外框架式，環境空氣溫度類別- 40 b安裝使用場所應無導電性或爆炸性塵埃應不含對金屬有嚴重腐蝕的氣體及蒸汽應無劇烈機械震動。 -
A field ambient vibration test of the qingzhou mingjiang cable - stayed bridge was carried out, and all the 168 stay cables " tensions are obtained by the proposed frequency differences method
對福州青洲閩江斜拉橋拉索進行了環境振動測試與分析，使用頻差法得到了全部斜拉索的索力。 -
Keywords : ambient vibration measurement, seismic capacity, rc buildings, regression
關鍵詞：微振量測、耐震能力、鋼筋混凝土建築物、 ?歸分析。 -
After that, the fe model was calibrated in terms of ambient vibration test results, and more precise fe model was obtained, which could represent the current service condition of the bridge truly
根據實測結果進行有限元模型的參數修正，得到反映橋梁現時真實工作狀態的較精確的有限元模型。 -
2. the field ambient vibration tests induced by wind and normal traffic were carried to determine the real dynamic characteristics, including vertical, torsional, transversal and longitudinal frequencies and modal shapes, each cable tension force, as well as the figure of the bridge deck
2 .進行實橋在環境激勵下的動載試驗，測量該橋的豎向、扭轉、橫向以及縱向的動力特性，所有拉索的索力及橋面線型。 -
Experimental modal analysis based on ambient vibration is mainly to deal with the engineering problems from with we can hardly achieve the input signals, such as the operational modes of a flight vehicle during the flight or the dynamic behavior of a large - scale structure like an offshore platform, a bridge as well as a skyscraper on which we can ’ t exert a heavy kick
基於環境振動的實驗模態分析主要針對一些激勵不可測的工程問題，如研究飛行器在飛行中的運行模態，或諸如海洋平臺、橋梁、摩天大樓之類難以施加激勵的大型結構的動態特性。本文重點研究了隨機子空間方法在環境振動模態分析領域的應用。 -
At first in this article, by looking into plenty of articles at home and abroad for reference, it gives an overview of ambient vibration modal analysis. it expounds the great importance of ambient vibration modal analysis to engineering, introduce the development course of the methods in this field as well as its current status
首先，通過查閱大量國內外相關文獻，對環境振動模態分析領域的狀況作了綜述，闡述了基於環境振動的模態分析在現代工程應用中的重大意義，詳細介紹了該領域各種方法的發展歷程，並說明了相關方法的研究現狀。 -
Then some measuring instrument now in use are introduced, including their applicability, measurement precision and cost efficiency, etc. in addition, two main factors influencing on torque measurement precision, shaft vibration and ambient temperature, are discussed and corresponding revolutions avoiding these influences are brought forward
針對目前最為精確和行之有效的扭矩儀法，重點分析了被測軸的振動和環境溫度等因素所引起的測量誤差及其相應的解決辦法。
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