Based on the alterative information of vibration mode and natural frequency in the presence of cracks, the thesis focus on the study of diagnosis index of cracks for plate and intelligent diagnosis of cracks using BP neural network.

本文主要依據板有無裂紋的振型和固有頻率的變化信息欧美多毛XXXXX性喷潮6，研究適于板的裂紋診斷指標，在此基礎上精品在线观看公司，采用BP神經網絡開展板的裂紋的智能診斷研究成年免费视频黄网站在线观看不卡。

Fifth, because of the influence of the gyroscopic moment, there is obvious deflection at a plate and vibration mode of the dual-rotors system rotating in the opposite direction is different from that of the dual-rotors system rotating in the same direction.

由于陀螺力矩的影響，使得反向旋轉的雙轉子振型與同向旋轉的雙轉子有較大區(qū)別又粗又硬又大欧美69a√，在高階振型中輪盤附近會出現明顯撓曲，在發(fā)動機設計中應引起重視爱情岛论坛自拍亚洲品质福利。

The analyzing result reveals that the normal motion behavior of stator surface points is not pure planar elliptic, which breaks the concept of elliptic motion usually assumed by many researchers. On basis of these analyses, the criteria of vibration mode select and optimal design are presented for simple-free and free-free supported stators.

首次提出了定子表面質點非平面橢圓運動行為的一般性欧美乱色伦图片区小说，打破了國內外學者經常假設的橢圓驅動軌跡的局限性；以此為基礎提出了定子在簡支和自由邊界條件下的振動模式選擇和結構參數優(yōu)化設計的原則欧美黄色视频久久。

Generally,the best efficiency is obtained in second order vibration mode of the fishtail,and the reverse Karman Vortex Street wake is observed with corresponding frequency.

在一般情況下當外磁場以系統的二階固有頻率工作時其工作效率最佳全部免费A级毛片免费看。在此情況下魚尾擺動產生了推力型反卡門渦街形態(tài)的尾跡渦流。

The sensitivity characteristics of the natural vibration frequencies and mode shapes of vibration structures with respect to mass and stiffness modifications are analysed based on the matrix perturbation method of the linear generalized eigenvalue problem.

基于線性廣義特征值問題的矩陣攝動重分析公式欧美性爱一级视频在线，較為系統地分析了振動系統各階固有振頻及固有振型隨結構質量和剛度的修改的靈敏度特性免费观看黄色网站视频免费观看黄色，得出了一系列具有重要實用意義的結論，指出了對結構進行攝動修改的最靈敏位置亚洲人妻网页。

It concludes that the mode of the linear pe-riodic time-varying vibration system is complex mode and isperiodically time-varying .

通過研究發(fā)現欧美黄色A片免费在线观看，線性周期時變齊次系統的模態(tài)不僅具有復模態(tài)的性質，而且為周期時變性√天堂中文www官网av。

On the knowledge of vibration of polyatomic molecules, it has gonethrough the change of two stages: from normal mode model to local modemodel. In present, there mainly are two methods to deal with this problem:the traditional approach, namely ab initio, based on solving Schr〓dinger equa-tions of molecular vibration, and the algrbraic approach based on group theory.

在對多原子分子振動問題的認識方面在线日本高清www免费看，人們經歷了從簡正模模型到局域模模型轉變的過程，而在處理方法上目前主要有兩種：基于求解薛定諤方程的從頭計算法和基于群論方法的代數方法亚洲日本一区二区三区。

The paper also simulate the vibration response of frame when suspension point were changed, which indicates, through comprehensive consideration with the mode of frame, that it can get better oscillation damping affection to position the suspension points to the node of mode shape.

本文還在模態(tài)集成模型上模擬分析了發(fā)動機懸置點的變化時車架振動響應亚洲网中文字幕，表明通過與車架的模態(tài)綜合考慮，把發(fā)動機的位置變換到車架模態(tài)振型的節(jié)點位置也有較好的減振效果www.干干干.cao。

Fist, mode analysis is accomplished, and stiffness influence of the structure by the member parameter and the accessional columns are analysed. Then the numerical value of the pulsoting wind load was used, the time history contrastable analysis between mega-sub controlled structure and general megaframe structure has been accomplished. Finaly, the influence of vibration-controlled efficiency under the different member parameter of vibration-absorption megaframe structure is analysed.

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It is shown that the first order strain mode shape is sensitive to the damage degree and location of the frame joints. And the existence of vibration node in high order stain vibration shape may lead to misjudging.

結果表明，一階應變振型對損傷及其位置敏感国产美女久久精品香蕉69，高階應變振型節(jié)點的存在使得依據高階應變模態(tài)進行損傷診斷時容易造成誤判久久综合无码一区丝袜。