modal point 中文意思是什麼
modal point
解釋
眾數點-
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。 -
The second phase is the analysis to the inner structure of web table. this thesis discusses deeply at this phase. the key point to recognize the table structure is to extract a abstract logistic table from variants of table structures. this thesis presents a table analysis modal, according to which, the physical table, the abstract logic table and
識別表格結構的關鍵在於從不同類型的表格中提取出一種抽象的邏輯表格模型。本文提出了一種表格分析的層次模型，在該模型指導下，逐步生成物理內存表格、抽象邏輯表格以及功能性表格。 -
The major work is as follows : 1 ) based on dry hull modal analysis of flexure - torsion coupling vibration of unsymmetrical ship structures about longitudinal centerline, a transfer matrix method to calculate the dynamic characteristics is adopted after the parameters of structures are specified. taken both shear effect and warping deformations into account, the point and field transfer matrices are derived, and the influence on dynamic characteristics is computed according to different damaged positions and areas
其主要內容如下： 1 ）通過薄壁梁理論求得結構參數后，採用遷移矩陣法，在考慮剪切效應、轉動慣量和翹曲影響下，推導出求解破損船體結構的動態特性公式系統的場遷移矩陣和點遷移矩陣，並著重分析了船體不同破損程度和翹曲變形對船體振動的動態特性的影響。 -
Matlab procedure is coded to compute the far - field sound pressure levels of the shell excited by radial point force. the influences of modal truncation, stringers, bulkheads and damping on the shell ' s far - field sound pressure are analyzed, laying down the basis for accurate analysis of the sound radiation from fluid - loaded reinforced double cylindrical shells
本文用matlab編製程序求解了單層殼在徑向激勵力作用下的遠場聲壓級，分析了模態截斷數、縱骨、艙壁板、結構阻尼等因素對殼體遠場輻射聲壓的影響，為準確計算加筋雙層殼在水下振動和聲輻射特性奠定了基礎。 -
As to the polyreference implemention of the least - squares complex frequency - domain estimator in mathematical separation technique of modes, this thesis builds a right matrix - fraction description model to estimate the system poles. then frequency point stabilization diagram is set up and analyzed to automatically determine natural frequencies, modal damping ratios and modal participation factors. finally mode shapes are identified based on the least squares theory
對于模態數學分離技術的多參考點最小二乘復頻域識別技術，先建立右矩陣分式頻響模型，識別出系統極點，再通過建立和分析頻率點穩態圖，能自動的確定出結構的固有頻率、模態阻尼比和模態參與因子，最後根據最小二乘原理識別出模態振型向量。 -
The paper is about the application of genetic algorithm ( ga ) in daylightning design in architecture. it first establishes the cone model of a single point measurement and the mathematical model shade of the rectangle construction, then gives the algorithm of the latter modal, which is called single point algorithm
本文所研究的是遺傳演算法在建築中日照採光設計方面的應用，首先從一些天文學的概念和理論知識出發，建立單點日照圓錐的模型，然後建立起矩形建築單點遮擋的數學模型，給出其演算法即單點演算法。 -
In current network applications, c / s modal is the mainstream. but with the quick development of the distribute computing and new network technology, more and more people focus their attention on p2p modal in recent days. the main difference between p2p modal and c / s modal is that the former does n ' t rely on a server, thus control is distribute. some modals of p2p even do n ' t require a server. the p2p modal has excellent redundancy. no single fault point in p2p modal. p2p modal can be a good complementarity of c / s modal. and of course, as a new technology, p2p modal is not maturate. it even has n ' t a standard protocol till now
而隨著分散式計算的深化和網路技術的進一步發展，對等式網路模型（ p2p ）開始受到重視，並成為最近的技術熱點之一。 p2p模型與c s模型相比，最大的不同是降低了對服務器的依賴及其分散控制，一些p2p模型甚至不需要服務器。 p2p系統的冗餘性很好，沒有單一的失敗點。 -
Secondly, two improvements are made in the fuzzy point - matching algorithms. the first is converting matching matrix ' s one - way constraints to two - way constraints, so the situation of modal point - set and target point - set having outliers can be dealt with now
（ 2 ）對現有的模糊匹配演算法進行了改進：首先將匹配矩陣滿足的單向約束改成雙向的行列約束，從而可以處理模板點集和目標點集都有出格點的情形。
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