查询词典 vibrator

The audible signal provided by the tone is complemented by a vibrator which can be set to operate either in concert with the tone, or simultaneously

口气提供的可听信号由可以设置经营协力口气的振荡器补全，或者同时

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。

Week 3 Simple vibrator model- spring vibrator, kinetic equation of simple vibrator and its solution, illustration method of simple vibration with rotating vector, energy of simple vibrator.

第3周 简谐振子模型——弹簧振子；简谐振子的动力学方程及其解；简谐振动的旋转矢量图示法。简谐振子的能量。

So we designed a adaptive synchronizing controller based on hereinbefore hardware environment: first a small magnitude reference signal r is outputted to system through the signal card (to ensure that the vibrating system works in a linear state), and this signal is sent to the moving coil of vibrator through the power amplifier, so vibration is produced through electromagnetic induction. Secondly the vibration signal can feedback to the data acquiring card in the servo system through the acceleration sensor on the Vibroseis reactor M〓 and the base-plate M〓, then the computer can get the current vibrating state y〓 of the coil of vibrator according to the feedback information from the data acquiring card, and give a real time comparing between the current state y〓 and the reference output y〓 of the set-in reference model with current reference input being r , then regulates the correlative controlling parameters according to the error e〓=y〓-y〓 till y〓→y〓, finally normal signal sweeping begins with a certain phase fixed. Meanwhile a synchronization signal for seismic signal record is sent to seismograph from synchronization signal outputting component in the Vibroseis system to perform the controlling process of synchronization of sweeping phases.

为此，我们基于以上的硬件环境设计了一个自适应同步控制器：首先通过信号发生卡对系统输出小幅度的参考信号r(从而保证振动系统工作处于线性状态)，信号通过前置放大器、功率放大器等送到激震器动圈，并通过电磁感应产生振动，振动信号通过可控震源激震器反应块M〓和基板M〓上的加速度传感器反馈给伺服系统中的数据采集卡，工控计算机根据采集卡的反馈信息，获取当前激震器动圈的振动状态y〓，并实时地将该状态与内置的参考模型在当前参考输入r下的参考输出y〓进行辨识，再将两者输出误差e〓＝y〓-y〓对系统的有关控制参数进行调整，直至y〓→y〓，最后在经过某一固定的相位后，开始信号的正常扫描过程，与此同时，由可控震源系统的同步信号输出部件向地震仪送出一地震信号记录同步信号，进而完成扫描相位同步控制过程。

Working under the vibration-centrifuge compound environment, the components of the vibrator are unbalanced because of the centrifugal force, which prevents the vibrator from working properly.

安装在离心机机臂上的振动台在离心力作用下各部分偏离了平衡位置，影响了振动台的正常工作。

Then the creative research work on ultra-low frequency and large amplitude elcectromagnetic vibrator based on moving magnet is done, improving exciting signal at ultra-low frequency, and, the theoretic analysis and experiment model are studied. Thus, the reference for establishing ultra-low frequency standard vibrator in future is provided. In chapter 5, two control strategies for ultra-low frequency standard vibrator test table waveform are studied.

首先采用机械振动隔振理论，研究设计了机械低通滤波器来滤除噪声信号，并运用等效的小振级信号进行了实验研究，得出了有益的结论；然后为提高超低频时激振信号，作者创造性地提出了动铁型大位移的电动振动台结构，进行了理论分析和实验模型研究，为将来建立大位移的超低频标准振动台提供了参考。

WZ-2A Trace Vibrator is especially develeped and made for hospitals,sanitation and antiepedmic,scientific researell brauches and producing Departments as the vibrating gools used for micro blood serum analying.

WZ-2A型微量振荡器（ WZ-2A Trace Vibrator）介绍：微量振荡器是专门为医院、卫生防疫、科研单位和生产部门研制生产的，作微量血清分析等用途的振荡工具。

I love the packaging of the sleeve and the vibrator, i love the touch of the skeen, the vibrator is so amazing, it's really great and i'm glad of my order :- Thank you again, and good luck for the future! Julie - France

我爱套筒和振动包装，我喜欢它的触感，这真是令人惊奇，我为我的订单高兴：-谢谢你，祝你好运Julie - France

The paper makes description of effective box beam construction technology and workmanship which can be adopted in other projects,such technologies as:manufacturing and fixing of reinforcement,steel reinforcement fixing baseplate,web plate and top plate respectively and lifting the steel skeleton into form,requirements of design and manufacturing and way of utilization for dismantling-erection type formwork and hydraulic formwork,optimization of concrete ratio,concrete pouring process of two ends of beam in priority over the middle,in sequence of first baseplate followed by web plate and top plate at last,concrete pouring in inclined section and in horizontal layer,concrete vibration mainly byexternal vibrator in assistance with internal vibrator,methods and regulation for steam curing of concrete,dual controls over stress and strain to ensure quality of prestressing workmanship,construction method of effective beam moving by heavy-weight special moving facility,some regulations and key notes about construction of grouting under pressure,beam ends sealing,water-proof layer on the bridge surface system,protective coating.

文中介绍的采用胎具制作和绑扎钢筋，分底腹板和顶板分别绑扎并吊装钢筋骨架入模；拆装式和液压式两种模板的设计、制作要求和使用方法；综合考虑、优化混凝土配合比，混凝土灌注从两端至中间、先底板、后腹板、再顶板的施工顺序和斜向分段、腹板水平分层、附着式振捣为主、插入式捣固为辅的施工工艺，蒸汽养护的方法和规定；应力～应变双控制确保预应力施工质量的施工技术；采用重物移运器有效移梁的施工方法；压浆、封端、桥面防水层和保护层施工的一些规定和注意事项等都是对箱梁制造行之有效的施工技术和施工方法，并可为以后类似施工作借鉴。

New box design with durable 0.5 inch (13 mm) paving skin Vertically-adjusting mold mount for precise leveling of mold to machine Telescoping end sections with 12 inches (305 mm) of width variation on each side are available Standard paving depth is zero to 24 inches (610 mm)Edge slump adjustment Hydraulic Vertical Hinged Sideplates, self-contained inside the mold for track clearance Split, pressure-compensated sideplates Folding side plate wings for transporting without removing Pivoting mold mounting beam to eliminate stress points Self-supported TA is hydraulically driven with 3.5 inch (89 mm) ACME screws for up to a six inch (152 mm) crown Front and rear top T-bar on mold for attaching accessories and structural integrity Inserts are bolted together with front and rear alignment pins for easy mold assembly New vibrator mounting tube attaches to T-bar on mold – Vertical vibrator lift – Rear lubrication system with grease zerks accessible from the work bridge New strike-off – Mounted on paver frame T-rail, independent of the mold – New modular design with wedge lock system for ease in changing widths – 10 inches (254 mm) of hydraulic height adjustment – Hydraulic crown adjustment Spreader plow mounted to paver frame T-rail, optional auger available Tamper bar optional

与耐久性的新的箱子设计铺精密水准测量的0.5英寸(13 mm)皮肤垂直调整的模子登上模子用机器制造挤撞与12英寸(305 mm)的末端部分在每边的宽度变异是可利用的标准铺的深度是零对24英寸(610 mm)边缘暴跌调整水力垂直的取决于的Sideplates，独立性在轨道清除分裂的模子里面，折叠运输的pressure-compensated sideplates旁边板材翼没有去除在轴上旋转的模子架置射线消灭重音点Self-supported TA水力驾驶与3.5英寸(89 mm)由六英寸(152 mm)冠决定的尖端螺丝在前后冠上在模子的T酒吧附有的辅助部件并且结构正直插入物与容易的模子汇编新的振荡器架置管随员T酒吧的定位销一起在前后被闩上在模子–垂直的振荡器推力与油膏zerks的–后方润滑系统容易接近从新工作的桥梁触击–在摊铺机框架足迹，模子的独立登上了与楔子锁系统的–新的模块设计在改变的宽度的舒适的– 10英寸(254 mm)水力高低调整–水力冠调整分布器犁登上了对摊铺机框架足迹，任意任意木钻可利用的堵塞器的酒吧

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。