查询词典 high power

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.

本课题从理论模型、有限元数值试验、有限元控制模型等方面以复合振动模式振子为例对超声电机压电振子的动力学特性及其分析方法进行了全面系统地研究，得出了许多有价值的结论，主要概括如下： 1、阐述了目前针对超声电机压电振子的主要建模方法，对压电振子动态特性的研究意义和必要性进行了论述，突出了本文研究内容的迫切性； 2、以压电陶瓷诱发弹性体发生弯曲变形为例，分析了压电陶瓷通过诱发应变来实现机电能量转换的机理；对基于纵弯模式的压电振子的运动及动力传递机理进行了分析； 3、基于模态假定，利用分析动力学的Hamilton原理，建立了面向直线超声电机压电振子的机电耦合动力学模型，并据此建立了压电振子的等效电路模型，导出了电参量与动力学特性参量的耦合方程，为压电振子与驱动电路的匹配提供了依据； 4、从压电陶瓷的本构方程出发，综合力场的弹性动力学方程、几何方程、电场的麦克斯韦方程以及相应的边界条件方程，采用虚位移原理，建立了压电振子动态问题机电耦合场求解的有限元控制方程，为研究其大功率驱动下的非线性本构模型奠定了基础； 5、界定压电振子的动力学特性指标，对压电振子的机电耦合动力学模型参数进行计算及变参数仿真；依据等效电路模型，对压电振子的电学特性进行了仿真分析；通过有限元数值实验，对压电振子工作模态附近的模态振型及工作频率附近的频段进行了激振效果分析，找出了实现模态简并的激振频率；利用有限元控制方程，通过编程计算，对压电振子的力电耦合场参数进行了详细计算，得出了一些有价值的结论。

Paper industry the past few years of hard work elites and radical reform of our paper has been the rapid development, but in the second half of 2008 the global financial crisis under the fierce attacks of the paper we are faced with unprecedented challenges, reduce a large number of foreign orders, hydro pulper aging equipment, paper machine operating speed of the slow, low value-added products, filter equipment, up-flow low pressure output screen, high power consumption, coupled with China's increasing pollution of the paper industry environmentally friendly water treatment sludge, objectively, there are difficulties we are now, how fast out of the current predicament?

经过这几年造纸行业精英们的艰苦努力及大刀阔斧的改革我们的造纸业有了飞速发展，但是在08年下半年全球金融危机猛烈的侵袭下我们的造纸业正面临着前所未有挑战，国外订单大量缩减，水力碎浆机设备的老化，纸机车速的运转缓慢，产品的附加值低，筛选设备升流压力筛的产量低，电耗高，加上我国加大对造纸行业污水污泥的环保治理，客观上我们现在是有困难，如何快速走出当前的困境？

What's more, WDT has been applied in the control system of high-power pulsed source.

进一步，本文结合嵌入式实时操作系统μC/OS-II 的特点，讨论了其在控制系统中运用的方法。

Developed a simple CNC turret punch press, high-power upgrade the general CNC feed products, the vast number of small and medium-sized enterprises to adapt to the requirements of product processing, has greatly improved production efficiency by users.

公司研制的简易转塔式数控冲床，高倍升级了普通式数控送料产品，适应了广大中小型企业的产品加工要求，极大地提高了生产效率，受到用户好评。

By considering this effect,the realizability and the stability of the cavity can be improved, when a high power and asymmetric laser cavity is considered.

利用激光谐振腔的此性质可以对Kerr被动锁模激光器的谐振腔的设计进行优化，从而提高其锁模的可实现性以及谐振腔的稳定性。

It is well known that the collision produced plasma may efficiently neutralize the space charge effect of the REB and enhance the production rate of the high power microwave. Our simulation results verify the above conclusion.

增加中性气体密度，返波管的输出频率明显上移，其辐射的功率和效率比相同的真空器件也有明显的提高。

The result shows that the mathematical model is right, and can provide a reference and assistance for the design of high power factor rectifier.

结果表明：建立的电压型 PWM 整流器的数学模型是正确的，能够为高功率因数整流器的设计提供参考与帮助。

It cleared for about half an hour and a number of people were able to try the refractor. Everyone was very impressed, especially when they used high power and could see sharp Airy Rings.

我们没有别的意思，主要是想把某些事情搞清楚而已，不能随随便便的就对某项产品评头评足的。

Based on the theory of stimulated Reman scattering, this paper discusses the SRS of N_2 in the atmosphere and its effects on high power laser beam propagation.

大气中的受激喇曼散射作为强激光大气传播的非线性效应之一，在当前日益引起人们的重视和关注。

The heat conduction in frozen biological tissue irradiated by high - power short - pulse laser was investigated experimentally. The micro - scale film resistance thermometer with 1 JAS response time was used to measure temperature.

本文采用响应时间为1μs的超小型薄膜铂热电阻温度计及日本YOKOGAWA DL2700高速数字示波器，对微秒量级脉冲激光照射下冷冻生物组织内的热传导进行了实验研究。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新