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fundamental frequency

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fundamental frequency 【物理學】基頻。

【物理學】基頻。 “fundamental“ 中文翻譯：   adj. 1.基礎的，基本的，根本的，重要的；原始的，主 ...“frequency“ 中文翻譯：   n. 1.屢次，頻仍，頻繁。 2.(脈搏等的)次數，出現 ...“frequency, fundamental“ 中文翻譯：   基頻“fundamental blade passage frequency“ 中文翻譯：   槳葉基頻“fundamental frequency band“ 中文翻譯：   基頻譜帶; 基諧頻帶“fundamental frequency combining“ 中文翻譯：   基頻合并“fundamental frequency indicator“ 中文翻譯：   基本頻率指示器“fundamental frequency magnetic modulator“ 中文翻譯：   基頻磁調制器“fundamental frequency of decca“ 中文翻譯：   臺卡基波頻率“fundamental frequency vibration“ 中文翻譯：   基頻振動“fundamental mode of frequency“ 中文翻譯：   振動的基模“fundamental natural frequency“ 中文翻譯：   固有基頻“fundamental or natural frequency“ 中文翻譯：   基本頻率（或自然頻率）“fundamental resonant frequency“ 中文翻譯：   基波共振頻率“fundamental reverberation frequency“ 中文翻譯：   基本混響頻率“fundamental ripple frequency“ 中文翻譯：   脈動基頻“high-fundamental frequency blade“ 中文翻譯：   高基頻葉片“speaking fundamental frequency“ 中文翻譯：   說話的基音頻率“fundamental“ 中文翻譯：   adj. 1.基礎的，基本的，根本的，重要的；原始的，主要的。 2.【物理學】基頻的，基諧波的；【音樂】基音的。 a fundamental change 根本變化。 a fundamental function 【數學】特征函數。 a fundamental law 根本法則，基本定律；基本法。 a fundamental rule 基本原則。 n. 1.原理，原則，基本，根本，基礎。 2.【音樂】基音；【物理學】基頻，基諧波。 n. -ism 【宗教】原教旨主義〔相信《圣經》所說的事情都是真實的，并認為這一點對基督教來說是最基本的〕。 -ist n. 原教旨主義者。 adj. 原教旨主義的。 adv. -ly “fundamental to“ 中文翻譯：   很重要對“fundamental fundamental“ 中文翻譯：   基本的“a fundamental skill“ 中文翻譯：   一個基本的技巧“bartenieff fundamental“ 中文翻譯：   芭田妮芙基礎練習“basic fundamental“ 中文翻譯：   基本原理“colour, fundamental“ 中文翻譯：   紅、黃及藍三原色

fundamental particle

The main work of this thesis includes : 1 . using energy theory , the cable sag and bending stiffness effects are investigated on the determination of cable tension forces through cable ' s fundamental frequency . based on the curve fitting , the practical formulas are proposed where the cable tension can be easily estimated using measured fundamental frequency 本文的主要工作包括： 1 .考慮拉索的垂度和抗彎剛度對基頻的影響，用能量的方法，并輔以曲線擬合，提出了由基頻計算索力的實用公式，公式與理論解的誤差在以內，并對公式的適用范圍進行了討論。

However , a large amount of harmonic is generated in the power network when the electrified railroads loads consume fundamental frequency electric power . these harmonics make bad effect on the operation of protection relays and the precision of electricity measures , worsen the power quality and threaten the security of traction substations as well as other equipments in power system 但是電氣化鐵道從電網取得工頻能量的同時，向電網注入了大量的高次諧波電流，降低了供電質量，影響了繼電保護的正確動作和電氣量測量的精度，威脅牽引變電所的安全運行及電網中其他用電設備正常工作。

Second , through employing the 3 - d finite element model and the dual objective function inversion method developed in this paper , and taking the measured fundamental frequency of system and the structure response to a harmonic excitation at the top of structure in field as the reversion objectives , the linear material parameter inversion is performed in ansys by using ansys parameter design language ( apdl ) 第二,采用三維實體有限元模型和本文提出的雙目標函數反演方法,把現場測試得到的系統基頻和頂部激振下實測的結構動力響應作為反演目標,利用ansys參數設計語言( apdl ) ,在ansys軟件中實現了系統材料線性參數的反演。

On the basis of theoretical analysis and numerical calculations using matlab language combined with a real instance , it is indicated that the improper electrical parameter coordination caused by the abundance of power cable lines result in fundamental frequency current resonance , in addition , the countermeasures based on svc to solve the problem are put forward 文中結合某變電站異常運行狀態實例，在理論分析和matlab語言數值計算的基礎上，指出由于電纜的大量使用導致了該系統參數配合不當，從而誘發了基波電流諧振，并提出裝設靜態補償器以防范該類諧振。

The optimal model of truss structure is established , in which the cross sectional areas of bar are taken as design variables , the structure weight is taken as objective function . in the process , the reliability of structural displacement and bar stress and the fundamental frequency are taken as constraint functions . from the engineering practice , all the reliability constraints , which are implicit generally with the design variables , are equalized and transferred to the conventional explicit constraints 本文將主要考慮桁架結構的優化問題，首先建立數學模型，即以桁架的橫截面積為設計變量、以重量最小為優化目標，位移、應力等可靠性及基頻為約束條件；最后，從工程實際出發，對結構系統的可靠性隱形約束進行等價顯化處理，使之轉化為常規的橫截面積優化問題。

The idea , measuring the moa resistive current only depending on current signal without using other ways , which is based on constructing the capacitive fundamental frequency current and the capacitive 3rd harmonic current , has been analyzed experimentally and theoretically . ( 3 ) . experiencing on different types of moa with this device , and then educing several new conclusions 2 )利用智能式moa泄漏電流在線監測多功能裝置，對不同類型的閥片做了大量試驗總結了一些新的試驗結果，應用于只取電流信號分析出moa阻性電流的新想法。

Breaking off at wuwei on the hai - jin liens , after “ ti “ mode joined into wuwei 330kv transformer substation , it may bring some problems , such as fundamental frequency excessive voltage , resonance excessive vohage , stability , undercurrent , reactive power compensation , etc . these problem be analyzed . it provides the schemes of design and build wuwei transformer substation and reform the transmission line of hai - jin - jia 在海金線武威開斷， “ ”入武威330kv變電站后可能帶來的如：工頻過電壓、諧振過電壓、穩定水平、潛供電流、無功補償等問題進行分析，對武威變電站的設計、建設及海金嘉線路改進提供方案。

The cable sag and bending stiffness effects are studied on the higher natural frequencies of cable vibration . it is found that the differences of the higher adjacent frequencies go to the fundamental frequency of the taut string theory even though the cable sag or bending stiffness is included . this unique characteristic of cable vibration is used to determine the cable tension with the well - known taut string theory 2 .考慮垂度和抗彎剛度對高階自振頻率的影響，探討了索相鄰頻率之差，發現索的高階頻差就是弦振動理論的基頻，利用這一特性，分析了頻差法測索力的精度和適用范圍。

According to the characters of the power harmonic , a kind of self - adaptive harmonic detection method based on in - phase correlation filtering is presented , which is clear and concise in thinking . by this method the low - pass filter can be designed easily , and by using the multiresolution and self - adaptive technique the difficulties of harmonic detection with low variable fundamental frequency and no voltage reference are worked out , which contributes much to the implementation of harmonic suppression 該方法思路清晰、簡潔，并能方便有源濾波器( apf )中低通濾波器設計，同時采用多分辨率和自適應濾波方法，解決了基波頻率低且變化、無明顯電壓基準可尋的復雜供電系統諧波檢測的難題，為諧波抑制的實施奠定了基礎。

As a result , shifting of the fundamental frequencies and redistribution of stress in the blade base possibly cause failure of the blade . a three - dimensional finite element model of a blade and its fir - tree attachments have been constructed and analyzed with taking into account of contact nonlinearity in the attachments and large deformation effect of the blade . the geometry mismatch was introduced into the finite element model by defining gaps between two contact surfaces in the attachments 分析結果表明葉根誤差發生的位置對葉片彎曲振型的固有頻率影響較大,對扭轉振型影響較小;誤差的大小對葉片各階固有頻率影響均較小,但對葉根應力分布有影響;比較發現,在計算固有頻率時,將葉片在葉根處簡單地處理成固支位移邊界是不合理的。

The butterworth wavelet filter with good magnitude - frequency characteristics is adopted to process the vortex flow signal , and the fundamental frequency of signal is estimated effectively . the algorithm is implemented in a digital signal processing system based on a tms320vc5409 dsp chip , and its effectiveness is proved 采用幅頻特性較好的iir型butterworth小波濾波器，處理渦街流量信號，估計基頻，并在以tms320vc5409為核心的渦街流量計數字信號處理系統上實現，證明其方法的有效性。

At present , the infrared transmission spectroscopy is the best technique for determining whether jadeite is polymer - impregnated or not , and the infrared reflectance spectroscopy is a nondestructive and rapid determination method that provides mainly the fundamental frequency vibration spectra data of minerals and shows new application potentials in gemological research , especially in the identification of gem species 摘要紅外透過光譜技術是當前鑒別翡翠是否有聚合物充填的最好方法，而紅外反射光譜技術是一種快速、無損傷的測試方法，主要提供礦物的基頻振動光譜信息，在寶石學研究方面特別是鑒定寶石種屬方面顯示出新的應用可能性。

Three kinds of excitations , namely , harmonic force with frequency equal to the structural fundamental frequency , harmonic force with frequency equal to half of the structural fundamental frequency and pulse force are applied to such four kinds of models . the displacement responses of the four kinds of models are calculated using sap2000 and the integrations of displacement responses are obtained by numerical calculations 將三種激勵形式:激勵頻率等于結構基頻的簡諧形激勵、激勵頻率等于結構基頻之半的簡諧形激勵和錘擊激勵分別施加在這四種模型上,通過計算得到四種模型的位移響應,進而得到位移積分響應。

A method of pitch mark determination for a speech , includes : acquiring a fundamental frequency point and fundamental frequency passband signals by using an adaptable filter ; detecting a number of passing zero positions of the fundamental frequency passband signals ; and generating at least a set of pitch marks from a number of passing zero positions 一種決定語音音高標記的方法，系藉以找出一語音之一組音高標記，此決定語音音高標記的方法系利用一可適性濾波器取得一基頻點與一基頻帶通訊號；求取基頻帶通訊號之復數個過零點位置；然后經由復數個過零點位置產生至少一組音高標記。

Under these assumptions , three kinds of excitations , namely , harmonic force with frequency equal to the structural fundamental frequency , harmonic force with frequency equal to half of the structural fundamental frequency and pulse force are inputted to the undamaged and damaged structures . then under the same excitation , the undamaged structural displacement responses , velocity responses , acceleration responses , jerk responses and responses of integrated displacement are compared with that of the damaged ones 在此假定基礎上,分別將激勵頻率等于結構基頻的簡諧形激勵、激勵頻率等于結構基頻之半的簡諧形激勵和錘擊激勵輸入結構,而后比較了損傷前后結構在相同激勵下的位移響應、速度響應、加速度響應、加加速度響應和位移積分響應。

In the thesis , a signal processing scheme of polarization - insensitive fiber optic michelson interferometric magnetic sensor is described : making the interferometer work near the quadrature with closed loop controlling working point method , the fundamental frequency component of the magnetic field sensing signals can be detected to measure the input direct current ( dc ) magnetic field by phase sensitive demodulation 本文主要介紹了偏振無關光纖michelson干涉型微弱磁場傳感器信號處理的方案:通過閉環控制工作點算法使干涉儀工作在正交工作點處,再利用相敏檢波算法提取傳感器輸出信號的基頻分量,以測量直流磁場的大小。

This way has been improved in this paper . whole - cycle fourier differential algorithm is adopted in record start - up to satisfy the real - time requirement . the least squares method is applied to extract the fundamental frequency component in location which has low computing speed but high precision 故障錄波啟動采用全波傅立葉差分算法，以滿足啟動實時性要求，測距所需基波的提取采用最小二乘法，適應其精度要求高而實時性無要求的特點。

Diode switches or voltage controlled varactors implement dual - band resonators such that they can offer low impedance at the second harmonic of each frequency band , while , in some cases , presenting high impedance at the fundamental frequency as an rf choke circuit 利用二極體開關或電壓控制變容器實施雙頻共振器以提供在雙頻操作中每一個頻段之二階諧波的低阻抗，同時在一些實施例里也提供主頻段的高阻抗、兼具有射頻阻塞電路作用。

The classic approaches for fundamental frequencies smoothing , such as linear smoothing , median smoothing and linear interpolation , can not work well in the case of that fundamental frequency is not detected correctly and several continulus frames 傳統基音的平滑方法：線性平滑、中值平滑和一般的線性插值方法都不能很好地處理連續的基音頻率有隨機錯誤點的情況。