modal frequency 中文意思是什麼
modal frequency
解釋
模態頻率-
We acquired the system ' s dynamic response when the satellite attitude was adjusted and the mode of the antenna. then modal analysis and dynamic analysis have been done to the satellite - antenna system by using the finite element analysis ( fea ) software of ansys. through the analysis we got the system ' s connatural characteristic, the amplitude - frequency characteristic of harmonic response, the power spectrum density of random vibration response, the maximal amplitude and resuming time of impact response
其次藉助ansys有限元分析軟體，對系統進行了模態分析和動力學響應分析，獲得了不同天線結構參數下的衛星?天線系統的固有特性，簡諧響應的幅頻特性，隨機振動響應的功率譜密度，以及沖擊響應的最大幅值和恢復時間等。 -
Basing the theory of finite elemental modeling and ansys software, this text build the entitative model and elemental model of the main parts and carry the modal analysis. and we get the natural frequency and shaking type of all steps. and then we compare the analysis results with the results of experimental modal analysis, testing the correctness of the elemental model
本文根據有限元建模理論，並利用ansys有限元分析軟體，分別對螺桿泵地面驅動系統的上述主要部件進行實體建模、有限元建模以及模態分析，確定這些部件的各階固有頻率和振型。 -
It shows that the modal shape and mode frequency are highly coupled with the viv response of a marine riser with low mass ratio
該模型的計算結果表明，立管的模態振型、模態頻率與渦激振動響應高度耦合，並且對于低質量比的情況尤為明顯。 -
In the process of solving, poles are obtained from recurrent formula, modal vector are obtained from superposition formula not residuary. decoupled equation is derived when vibration source is part correlation, severely coupling appears in the process of input and output then frequency response function cannot directly get according to method mentioned above, decoupling is first problem
當輸入完全相關時，頻響函數無解，可繞過頻響函數，直接運用線性系統的迭加原理來求響應，極點由遞歸公式得出，模態矢量由疊加公式求出，而不是由留數求得的相應的公式。 -
With dynamical modal analysis of electron gun by use of ansys software, we can get the inherent frequency and vibration model, which can avoid sympa - thetic vibration
利用ansys軟體對電子槍進行動力學模態分析可以得到電子槍的固有頻率和振型，從而在結構設計上避免共振。 -
The most achievement is that we firstly obtain the analytic accurate solution of the modal fields of the waveguide structure and find some available character : ( 1 ) the different uniaxial crystal materials have the different propagation properties ; ( 2 ) when the optical axis of the crystal is on the plane that is made up of the normal direction of the waveguide plane and the propagation, there are te mode and tm mode in this special waveguide, but the principal mode is different of the character of the uniaxial crystal, the principal mode is the principal mode of te mode for the negative uniaxial crystal, but the one of tm mode for the positive uniaxial crystal ; ( 3 ) when the crystal optical - axis parallel to the waveguide plane, for the positive uniaxial crystal material, the principal mode of the waveguide is a te wave, which can be excited by the light at any frequency ; when the light frequency satisfies a single mode propagation condition, there will be only the principal mode propagating in the waveguide, otherwise some of the higher order modes can be excited, which are neither te modes, nor tm modes, but the hybrid guided modes
本文就是在此背景下，利用金屬波導和單軸晶體的一些特性，結合麥克斯韋方程組和波導的邊界條件，從三種不同的情況研究了光在對稱平面單軸晶體金屬波導（波導層是單軸晶體，兩個波導界面均為金屬）內的傳輸特性，其主要貢獻為，首次解析地得到了這種波導結構下模式場的精確解，並發現了一些有用的特性： （ 1 ）模式場的性質因單軸晶體的性質不同而異； （ 2 ）當單軸晶體光軸位於波導界面法方向與傳輸方向構成的平面內時，波導中傳輸te波和tm波，只不過其主模因單軸晶體的性質不同而異，當波導層介質為負單軸晶體時，波導主模是te波主模，而波導層介質為正單軸晶體時波導主模是tm波主模。 （ 3 ）當單軸晶體光軸位於波導面內時，對于正單軸晶體，波導的主模是橫電波te _ 0模，任何頻率的光波均可激勵該模式；當光波波長滿足一定條件時，波導內傳輸單模，否則，將激勵起高階模式，高階模即匪te波，也匪tm波，而是兩者耦合而成的混合模。 -
Presents the model proposed for analyzing the vibration characteristics of shrouded blades and their calculation method by employing a wave propagation theory and modal synthesis technology coupled with a finite element method from the view point it is possible not only to conduct frequency modulation of the shrouded blades of a gas turbine, but also to utilize the friction effects between them to dissipate energy, thereby attaining the aim of vibration alleviation, as shrouded blades have been widely used in the design of high - speed turbomachinery, such as modern gas turbines and steam turbines, and with the shrouded blades forming an integral whole in a centrifugal force field, the vibration characteristics of the whole ring of blades are different from those of a single isolated blade, and this makes it essential to take into account the integral effect of blade shrouds, concludes from the calculation examples and engineering application that the above approach is valid and correct along with the possibility of considerably reducing the scale of calculation and analysis, and points out it is necessary to take into consideration the coupled effect of the whole ring of blades while the dynamic characteristics of shrouded blades is being analysed
帶冠葉片不但能調頻，還可以利用葉冠之間的摩擦效應來耗散能量，達到減振的目的.帶冠葉片在離心力場中形成一整體，其整圈葉片振動特性不同於單個孤立葉片，需考慮葉冠的整體效應.利用帶冠葉片系統的循環對稱性，提出了採用波傳播理論和模態綜合技術，結合有限元方法研究燃氣輪機帶冠葉片振動特性的分析模型和計算方法.算例和工程應用證明了該方法是效性的、正確的，並可以大大降低計算分析規模.研究表明帶冠葉片動力特性分析時必須考慮整圈葉片的耦合效應 -
In the modal analysis, the similarity laws has been introduced to reduce the error during the assessment of the prototype building ' s natural frequency under the insufficient balance weight testing. by the author ' s theory, the prototype natural frequency can be the same even the balance weight of model is changeable
在模態分析方面，本文利用相似性原理，解決了模態試驗在配重不足時，求解原型結構自振頻率誤差過大的問題，並且得出了在不同配重條件下，試驗模型與原型結構的頻率可以達到一致的相似準數。 -
Identification of time - varying modal parameters by a linear time - frequency method
應用時頻分析方法辨識時變系統的模態參數 -
3. according to the principle of the finite element method, the research establishes finite element models of the vibration transportation mechanisms, some model parameters such as the frequency and vibration type are confirmed and validated by the modal analysis, then which analyzes dynamic - state response of the model and confirms the swing distributing of the models, thereby make the design of models precise. 4
根據有限元法的理論，建立振動機構的有限元力學模型，對該力學模型進行模態分析，通過模態分析確定拋秧機振動形態和所需的頻率等參數；然後此基礎上再進行力學模型的穩態響應分析，研究該模態下機構的振幅分佈，以確定模型設計的準確性。 -
Method based on component analysis ( peak value pick - up ) and global orthogonal polynomial subsection fitting to obtain system damping ratio, natural frequency and modal shapes is especially described
著重描述了分量分析法（峰值拾取法）和整體正交多項式分段擬合法提取系統固有頻率及其振型的方法。 -
Next, the data are pre - processed to set up the neural network ( nn ) modal. then, the frequency vectors are put into the nn as the input data, however, the damage position and the damage degree are treated as the desired output
接著，以頻率向量作為神經網路的輸入值，與之相應的損傷位置和損傷程度作為神經網路的期望輸出值，對神經網路進行基於遺傳優化的學習，直至收斂。 -
The modal parameters identification of bridges in frequency domain
用頻域法識別橋梁的模態參數 -
Efficient method for identification of modal parameters in frequency domain
一種高效的頻域模態參數識別法 -
Basing on rc simple supported beam the study of the paper is modal analysis using the finite unit software ansys, and the relationship among the transformation of vibration frequency, value of attached load, position of attached load, degree of damage, position of damage is discussed
本文利用大型有限元軟體ansys針對工程常用的鋼筋混凝土梁橋進行了模態分析，討論了振動頻率的變化與附加荷載大小、附加荷載位置、破損程度、破損位置之間的關系，研究了混凝土梁橋從完整階段到破壞階段振動頻率的變化規律。 -
Base on review of existed study and application in suppressing cable vibration in the world, technique of mitigating cable vibration with viscous damper and mr damper has been investigated in this dissertation, and the main contents and progresses in form of summary are as following : 1 the motion differential equations of the cable - damper system are formatted, which take into account these factors, such as the inclined angle, sag, stiffness etc. coupling motion between cable and deck is studied with analytical and numerical method. numerical results show that large amplitude vibration of cable with beat rhythm will occur when exciting frequency of deck equals two times modal frequency of cable
本文在對國內外斜拉索振動控制研究與應用現狀進行綜合評述、分析的基礎上，針對上述問題進行了深入研究，具體的研究內容和取得的成果包括： 1 、建立了斜拉索-阻尼器系統運動方程，對拉索與橋面的耦合振動作了分析和研究，數值結果顯示當橋面激振頻率等於某階拉索模態頻率的兩倍時，很小的初始擾動將引起拉索的大幅振動，並呈現拍振的特徵，與實測的拍振信號一致。 -
Based on structural dynamics, different damage diagnosis index, such as modal frequency variety, modal assurance criterion, co - ordinate modal assurance criterion, modal strain energy, remains force vector, modal strain, rigidity change, flexibility matrix, modal curvature and so on, are studied in this thesis
基於結構動力學理論，本文論述多種損傷識別指標的基本原理和計算方法，主要包括:固有頻率變化率、模態置信因子、改進的模態置信因子、模態應變能、殘餘力向量、應變模態、剛度變化、柔度矩陣、曲率模態等。 -
( 3 ) introducing the proportional damping, the finite element formula of structural - acoustic coupled system lined with sound absorbing materials is obtained. mode - superposition technique for modal frequency response analysis of coupled structure - acoustic systems is also used to deal with the sensitivities of the eigenvalues and eigenvectors of coupled systems for the purpose of reducing cavity interior noise in theory
討論了阻尼降噪問題，建立了有阻尼聲振耦合系統的有限元模型，採用振型疊加法，將系統位移轉換到以固有振型為基向量，進行結構壁面有吸聲材料的聲振耦合系統響應的有限元分析與靈敏度分析，推導了比例阻尼條件的靈敏度計算公式。 -
Modal frequency and vibration response of the gear box are computed by structural fem with a 3 - d fe model
建立齒輪箱三維有限元模型，採用結構有限元法計算齒輪箱模態頻率和振動響應。 -
The modal parameter identification using natural excitation technique and eigensystem realization algorithm are studied. reasonable results are identified. by introducing statistics to dispose the modal frequency of the structure, the preciseness and precision of the identified system mode are improved
研究了利用環境荷載激勵技術和特徵系統實現演算法進行模態參數識別，引入統計方法對模態頻率進行統計平均處理，提高了系統模態識別的準確性和識別精度。
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