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.

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Should define target market together with client as far as possible, locate the other target that be alluded from inside psychograph or demography standard and does not have designation actually.

應(yīng)該盡可能與委托人一起確定目標市場，找出從心理描繪圖或人口統(tǒng)計學(xué)標準中暗示而實際上沒有指名的其他目標A片在线观看网站。

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I shall define him as an individual who has elected as his primary duty and pleasure in life the activity of thinking in Socratic way about moral problems.

我將把他定義為一個體国产老人性交黄片，他已經(jīng)選擇以蘇格拉底的方式思考道德問題的活動為他的在生活中最重要的責(zé)任和愿望。

I shall define him as an individual who has elected as his primary duty and pleasure in life the activity of thinking in a Socratic way about moral problems.

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I shall define him as an individual who has elected as his primary duty and pleasure in life the activity of thinking in Socratic way about moral problem.

我將把他定義為這樣的人，他把以蘇格拉底的方式去思考道德問題作為人生首要的責(zé)任和樂趣在线国产主播专区第一页。

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Yet Wang Guangle has his own approach to painting. In his works like the Terrazzo series, Wang did not offer any definitive meaning or even content to the viewers, instead, the objects in these paintings are represented as the form itself, making it hard to define the works as "abstract" or "figurative".

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To define the relationship between ultra vires act of enterprise as legal person and that of legal representative can help to decide inside responsibility of enterprise as legal person.

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