Based on the analysis for the dynamic characteristics of semi-rigid steel frames with simple or multiple degree-of-freedoms,effects of rotation stiffness of beam-to-column connections on the structure period,frequency,critical damping and mode of vibration are discussed.

通過對單自由度體系和多自由度體系半剛接鋼框架的動力特征分析h视频bbixx，初步探討了梁柱連接轉(zhuǎn)動剛度對結(jié)構(gòu)自振周期、頻率二级a片免费看、臨界阻尼以及振型等參數(shù)的影響国产同人导航在线观看AV。

In the past, the high frequency resonance technique is usually applied in the envelope detection for a vibration signal with amplitude modulation. When applying the Hilbert transform in the high frequency resonance technique for the envelope detection of vibration signals, the computing burden is very high. On the other hand, when applying the linear least squares analysis method, the computing burden is lower. When applying the envelope detection in the lowest vibration mode, an accelerometer with the low-pass filtering cutoff frequency at 4kHz should be choose.

在過去的研究方法中，振動訊號之振幅調(diào)變通常以高頻解調(diào)分析法應(yīng)用於包絡(luò)訊號偵測资源先锋，而高頻解調(diào)方法應(yīng)用希爾伯特轉(zhuǎn)換的包絡(luò)分析亚洲天堂发布页，所需要的計算量是非常的高，若以線性最小平方分析法應(yīng)用於高頻解調(diào)分析法中欧美激情第一二三区，則所需要的計算量較小人人操人人干人人叫，如果以最低模態(tài)來估測包絡(luò)訊號時，可以適當(dāng)?shù)倪x取加速規(guī)來代替低通濾波器无码A级毛片视频免费播放，而加速規(guī)的截止頻帶必須在4kHz左右久久精品一区二区三区日韩。

Also, the characteristics of the lower order frequencies and the lower order mode of vibration are found out.

模態(tài)分析是動力學(xué)計算的基礎(chǔ)，為動力學(xué)分析計算提供了必要的模態(tài)參數(shù)视色视色网站。

It is found that the changes in the mode of vibration are sensitive to the damage degree of elements, and there exists a corresponding relationship between them.

發(fā)現(xiàn)振動模態(tài)的變化對單元損傷的程度較為敏感且有對應(yīng)關(guān)系。

Localization is able to destroy the regularity of mode of vibration in periodic structure and aberration of vibration mode occurs.

若周期結(jié)構(gòu)的整體結(jié)構(gòu)尺寸不是很大啊啊啊啊轻点视频，那么振動模態(tài)不會遍及整個結(jié)構(gòu)自拍日韩亚洲探花精品，出現(xiàn)振動局部化現(xiàn)象。

The free vibration of a nonlinear elastic rectangular plate is explored, considering influence of material nonlinearity and static-load in plane on its dynamic characteristics. Exact solution to free vibration of each mode of the rectangular plate is obtained according to the fixed point theory of partially ordered space. So the whole process of free vibration is described.

對非線性彈性矩形板的自由振動進(jìn)行了研究那个网址可以看毛片，考慮了材料非線性和面內(nèi)靜載對板動力特性的影響，并根據(jù)半序空間的不動點(diǎn)理論求得該矩形板在自由振動時各階模態(tài)的精確解黄色高清无码在线观看，描繪了其自由振動的全過程。

In this topic, the dynamic analysis methods for piezoelectric vibrator are studied systematically based on the theoretical model, FEM numerical experimentation and FEM governing equation for given compound-mode vibrator, and some valuable conclusions are obtained. The main work accomplished is summarized as follows: 1.Elaborate the main modeling methods for piezoelectric vibrator and the significance and necessity to study the dynamic characteristics of piezoelectric vibrator which emphasize the urgency of this paper. 2.Take the bending deformation induced by piezoelectric ceramic as example, the energy transfer mechanism of electric energy to mechanical energy are analyzed; the motion and force transfer mechanism are analyzed for the longitudinal-bending vibrator. 3.Based on mode assumption and Hamilton principle, the coupling model of piezoelectric vibrator of linear USM is built; moreover, the equivalent circuit model is obtained and a coupling equation represents the relation between electric parameters and mechanical parameters is derived which provides foundation to match the vibrator and driving circuit. 4.Combine the constitutive equation of piezoelectric ceramic with elastic-dynamical equation, geometric equation in force field and the Maxwell equation in electric field and the corresponding boundary condition equation, the FEM control equation for piezoelectric vibrator of USM to solve dynamic electro-mechanical coupling field is established by employing the principle of virtual displacement. The equation lays the foundation to study the non-linear constitutive equation of piezoelectric ceramic driven by high-power. 5.Define the dynamic indexes of characteristic of vibrator and carry out variable parameters simulation by calculating the model parameters and the electric characteristics of vibrator are simulated according to the equivalent circuit model. By numerical experimentation, the working mode of vibration of vibrator and the shock excitation results of the working frequency band which provides the mode frequency to realize bimodal are analyzed. Detailed calculation of the electro-mechanical coupling field parameters is made by programming the FEM control equation.

本課題從理論模型、有限元數(shù)值試驗(yàn)欧美午夜久久、有限元控制模型等方面以復(fù)合振動模式振子為例對超聲電機(jī)壓電振子的動力學(xué)特性及其分析方法進(jìn)行了全面系統(tǒng)地研究，得出了許多有價值的結(jié)論日韩欧美国产视频，主要概括如下： 1、闡述了目前針對超聲電機(jī)壓電振子的主要建模方法国产欧美久久一区二区三区，對壓電振子動態(tài)特性的研究意義和必要性進(jìn)行了論述在线观看无码视频网站，突出了本文研究內(nèi)容的迫切性； 2A日韩黄片、以壓電陶瓷誘發(fā)彈性體發(fā)生彎曲變形為例偷怕自拍亚洲色图，分析了壓電陶瓷通過誘發(fā)應(yīng)變來實(shí)現(xiàn)機(jī)電能量轉(zhuǎn)換的機(jī)理中国A黄片；對基于縱彎模式的壓電振子的運(yùn)動及動力傳遞機(jī)理進(jìn)行了分析； 399精品视频30精品视频、基于模態(tài)假定强奸,com，利用分析動力學(xué)的Hamilton原理A片在线观看视频免费网址，建立了面向直線超聲電機(jī)壓電振子的機(jī)電耦合動力學(xué)模型，并據(jù)此建立了壓電振子的等效電路模型韩国无码三级，導(dǎo)出了電參量與動力學(xué)特性參量的耦合方程91婬黄看大片，為壓電振子與驅(qū)動電路的匹配提供了依據(jù)国产激情大臿免费视频； 4鸡行业黑话全套、從壓電陶瓷的本構(gòu)方程出發(fā)，綜合力場的彈性動力學(xué)方程99re这里精品视频在线6、幾何方程97久久盗摄、電場的麥克斯韋方程以及相應(yīng)的邊界條件方程久久香综合精品色综合，采用虛位移原理，建立了壓電振子動態(tài)問題機(jī)電耦合場求解的有限元控制方程久草手机av，為研究其大功率驅(qū)動下的非線性本構(gòu)模型奠定了基礎(chǔ)A片集合； 5黄色A片洗澡、界定壓電振子的動力學(xué)特性指標(biāo)，對壓電振子的機(jī)電耦合動力學(xué)模型參數(shù)進(jìn)行計算及變參數(shù)仿真在线观看免费人成视频色WWW；依據(jù)等效電路模型欧美夜A级一级一级一级，對壓電振子的電學(xué)特性進(jìn)行了仿真分析亚洲天堂在线咨询；通過有限元數(shù)值實(shí)驗(yàn)，對壓電振子工作模態(tài)附近的模態(tài)振型及工作頻率附近的頻段進(jìn)行了激振效果分析国产黑丝视频，找出了實(shí)現(xiàn)模態(tài)簡并的激振頻率清风阁黄色视频；利用有限元控制方程，通過編程計算全黄色免费免播放器曰韩，對壓電振子的力電耦合場參數(shù)進(jìn)行了詳細(xì)計算色色视频网，得出了一些有價值的結(jié)論美女在线视频一区二区三区。

For vibration mode-shape, this affect is moreseverity on high rank stage vibration than low. With opened hollow and pier added on dam,the frequency of vibration decline.

對于振型而言，這種影響對低階振型比高階振型大亚洲春黄网站，考慮孔口和閘墩后国产免费高潮流白浆A片99，大壩的自振頻率有所降低黄色视频一区二区；在低階振型中有一部分的排列順序發(fā)生了變化，但這些變化不致使大壩的動力特性發(fā)生顯著的改變亚洲有码在线一区。

ChapterⅢ,system model of chapter II was simplified as the free vibrationmodel of the system to solve the inherent vibration frequency and vibration mode.The inherent vibration modes are divided into three categories:torsional vibrationmode of central component,translational and torsion pendulum vibration mode of thecenter component and planetary gear vibration mode.

第三章對第二章建立的系統(tǒng)模型簡化為自由振動模型，求解了系統(tǒng)的固有振動頻率及振型91麻豆精品，將各工況下的固有振型分為三類：中心構(gòu)件扭轉(zhuǎn)振動模式中文字幕日本在线网、中心構(gòu)件平移扭擺振動模式和行星輪振動模式另类性交在线。

Besides,the infrared and Ramam activity of the vibration mode of the molecule and some possible transition of the vibration spectrum has also been researched.The results show: the vibration mode of Cr6 molecule is Гvib=2A1g+2E...

研究結(jié)果表明，其振動模式是紅外活性精品国产一区二区不卡，振動模式A1g、Eg和T2g是拉曼活性欧美三级一级69，振動模式T1g和T2u是非活性的，紅外躍遷可以躍遷到T1u色中射网址，拉曼躍遷可以躍遷到A1g、Eg和T2g国产一区二区免费在线观看。