modal energy 中文意思是什麼
modal energy
解釋
運具能源-
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 -
( 3 ) in order to prove multi - point exciting experiment good, we employ traditional ergography ( hammering method ) to make experiment, peak value pick - up method to modal identification, and compare identification result by hammering method with vibration table experiment. the result revel that vibration table experiment can obtain larger energy and more adequately excite
在重頻、密頻時、在試驗試件的結構巨大，需要大的能量激勵才能充分激出完全模態時、在一激勵點為某階感興趣模態的節點時，都需要用多點激勵的方法。 -
A method is put forward which selects modal dofs in a few points according to element strain energy coefficient. therefore, the selected modal dofs in a few points usually have large amplitude, which is conducive to be measured and the network training
在選取少數節點的振型分量用於網路訓練時，提出根據單元應變能系數的大小來選擇節點，這些節點一般來講在振動中振幅較大，易於實測和用於網路訓練。 -
The first - order perturbation method correct for forcing decoupling method based on perturbation theory is put forward to decrease error ; iii. the complex modal method is introduced into analysis of non - classical damping systems to eliminate error of forcing decoupling method, and improve the complex modal response spectrum, which can apply to design of non - classical damping systems ; iv. for exerting the energy dissipation capability of each device, a two - step optimum method, whose controlling function is extremum expectation of interbedded displacement, is put forward to optimize the number and position of device ; v. the problem of iterative method applied to analyze energy dissipation systems is indicate, and give some primary advice based on pilot study
為改善上述缺點，本文進行了以下的研究工作：在忽略耗能器附加質量的基礎上，推導出適用於耗能減震結構的攝動法，減少振型分解法在迭代計算過程中的工作量，加快計算速度；針對運動方程的強行解耦所產生的誤差，根據攝動法原理，對其進行一階攝動修正；為消除強行解耦振型分解法用於非比例阻尼結構分析時產生的誤差，引入狀態空間對系統進行復模態分析，並改進了基於復模態理論的、適用於非比例阻尼結構設計的雙反應譜方法；對于耗能器的數量和位置優化進行了一些探討和研究。 -
Improved structural damage detection method based on modal strain energy
基於模態應變能診斷結構破損的修正方法 -
In frequency - domain, the background mode that has the most contribution to the buffeting energy of the structure is calculated using the background modal analysis method, thus the rms of the dynamic responses of long - span grid roofs is obtained. on the other hand, the rms of the dynamic responses is also obtained by direct integral method in time - domain. after the comparison of the results of two methods, several important conclusions can be made
在頻域內，採用背景模態分析法，通過計算得到對結構振動能量貢獻最大的一階背景模態，從而得到結構脈動響應的均方根值；在時域內，採用直接積分法求出結構響應的時間歷程，並且通過統計，同樣得到結構脈動響應的均方根值。 -
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。 -
Element - stiffness matrix baseline parameters and modal strain energy are employed for the selection of the base modes. an updated - latin hypercube sampling and modal assurance criteria are adapted for efficient generation of the inputs
用單元剛度矩陣基本值和模態應變能來選擇基本模態，用修正的latin超立方采樣技術和模態準入準則來產生網路的輸入數據。 -
There are three main approaches to predict the noise level : similitude structure method including the frequency - response method and proportion method, modal method including finite element method ( fem ) and boundary element method ( bem ), and statistical energy analysis ( sea ). the advantage of similitude structure method is to give the predicting data fast, but it has some error because of dealing with rough similitude parameter and mass load
目前對噪聲預示主要有三個方法：一是相似結構外推法，包括頻率響應法和比例法等；二是傳統的模態方法，包括有限單元方法（ finiteelementmethod ， fem ） 、邊界單元方法（ boundaryelementmethod ， bem ）等；三是統計能量分析方法（ statisticalenergyanalysis ， sea ） 。 -
Modal acoustic emission ( mae ) that uses the energy produced by the growing crack for detection without scanning has shown its conspicuous advantage
模態聲發射由於無需掃查工件而利用裂紋生長產生的能量來實現檢測，從而顯示了極大的優越性。
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