查询词典 electro-optical

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。

As an important component of electro-hydraulic proportional control system, the electro-hydraulic proportional valve controller is a device that providing a specific current to proportional valve, so that the flow or pressure of the liquid under continuously control in proportion to it.

电液比例阀控制器作为电液比例控制系统的重要组成单元，其功能是对比例阀提供特定性能的电流，使比例阀控制的液体流量或压力连续成比例地受到控制。

Master: rabbit fever model method, acupuncture bacteria or bacterial fever have a fever effect, electro-acupuncture in rabbits in order to observe the needle大椎穴of bacteria or bacterial fever antipyretic effect; to master the use of electro-acupuncture instrument Methods

掌握：家兔热模型的制作方法，针灸对细菌或非细菌性发热都具有退热效应，电针家兔大椎穴以观察针刺对细菌或非细菌性发热的退热效应；掌握电针仪的使用方法。

Schools electro-charge management system is application system of stand-alone edition, mostly with for register electro-circs of this school students rooming house and in this base process income overspend electricity.

学校用电收费管理系统是单机版的应用系统，主要用于记录本学校学生公寓寝室的用电情况并在此基础上进行超支电费收取。

The schizophrene has cognitive impairment. Electro-acupuncture can be benefit of memory,especiallyforlong-courseandshort-coursememory,butnotinstantmemory.Electro-acupuncturecanbebenefitofWCSTscore,netscaleandspeedofDSTaftertreatmentweresignificantlyhigher.

精神分裂症患者具有认知功能损害，电针可以改善患者的记忆，尤其是长时记忆和短时记忆，对瞬时记忆无改善；电针可以改善WCST评分；电针可以使精神分裂症患者的DST的划销速度，划销净分增加。2。

Sum up: Treatment with electro-acupuncture select Baihui and Shenting points belong to DUmeridian can be of benefit and disbenefit on schizophrene. It is helpful to cognitive function ofschizophrene, increasing memory, attention and perform function, but low efficacy to stability ofAbstract Vattention. It is better that Baihui and Shenting points cooperate with the point on Yin meridians orextremities in treating cognitive impairment of schizophrene with electro-acupuncture.

综上所述，电针百会，神庭穴对精神分裂症患者的治疗有正面和负面的影响，电针可以改善认知功能，提高患者的记忆，注意和执行功能，但对患者的注意的稳定性还缺乏疗效在治疗精神分裂症患者认知功能障碍的过程中，电针百会，神庭穴的同时最好能配合阴经穴位或远端穴位，因研究方法的不同及针对精神分裂症患者的试验难度较大等因素。

Electro music has become one of indiscerptible parts in modern music. Three foreign composers of electro music, invited by the Electric Music Department of Shanghai Conservatory, will add more splendidness and magnificence to our music week with their lectures and electric music concert.

电子音乐已成为当代音乐不可分割的一个重要组成部分，上海音乐学院电子音乐工程系所邀请的三位外籍电子音乐作曲家和他们的讲座以及他们的一场电子音乐音乐会都将为我们的音乐周增添绚丽的当代色彩。

The topic of this graduation project is precisely one kind of electro-hydraulic proportional valve----two stage electro-hydraulic proportional throttle valve.

本设计的课题是电液比例阀中的一类——二级电液比例节流阀。

The test bedstand which is composed of electro-motor ,hydraulic pump ,hydraulic motor ,speed verily box and parallel compensating pump, can resolve the problem of power consumption and the power warm while large power hydraulic pump and motor testing.the principle of system is that electro-motor drive the hydraulic pump first,then the pump make the hydraulic motor work through its high pression oil,the follow working hydraulic motor feedback the power in niuju re-drive the hydraulic pump,at last the power is recovered.this bedstand make use of bishi hydraulic system ,which can have a closely construct ,and steadly chuandong ,lower noise ,high power recovery percentage and so on.

本实验台由电动机、油泵、油马达和变速箱以及并联补油泵等一起构成功率反馈实验油路，以解决大功率液压泵及马达在试验时的大功率消耗和能量耗散时的发热问题。实验台由电动机带动油泵，油泵输出油液驱动液压马达，油马达输出的扭矩通过变速箱传动回馈给液压泵的输入轴，从而实现功率回收。采用闭式液压系统，结构紧凑、运行平稳、噪声低、功率回收率高；机械补偿，电动机输入扭矩经变速箱传动驱动液压泵；液压补偿，并联补油泵对系统的高压油路进行流量补偿。

The test bedstand which is composed of electro-motor ,hydraulic pump ,hydraulic motor ,speed verily box and parallel compensating pump, can resolve the problem of power consumption and the power warm while large power hydraulic pump and motor testing.the principle of system is that electro-motor drive the hydraulic pump first,then the pump make the hydraulic motor work through its high pression oil,the follow working hydraulic motor feedback the power in niuju re-drive the hydraulic pump,at last the power is recovered.this bedstand make use of bishi hydraulic system ,which can have a closely construct ,and steadly chuandong ,lower noise ,high power recovery percentage and so on.

本实验台由电动机、油泵、油马达和变速箱以及并联补油泵等一起构成功率反馈实验油路，以解决大功率液压泵及马达在试验时的大功率消耗和能量耗散时的发暖问题。实验台由电动机带动油泵，油泵输出油液驱动液压马达，油马达输出的扭矩通过变速箱传动来回馈给液压泵的输渗入渗出轴，从而实现功率往返收。采用闭式液压系统，结构紧凑、运行平稳、噪声低、功率回收率高；机械补偿，电动机输渗入渗出扭矩经变速箱传动驱动液压泵；液压补偿，并联补油泵对系统的高压油路入行流量补偿。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。