查询词典 tail rotor

In terms of the transmission shaft balancing, it exists another problem that the shaft is not looked at as rigid body.When the rotor running at a high-speed ,under the action of unbalance force ,the transmission shaft will bend. It is certainly ideal to balance a transmission shaft as a flexible rotor.However, considering the mass production of automobiles, this method is obviously unpractical. In order to discreasing the flexible deformation, in this theory, the feasibility that double- plane balancing takes method the place of multi-plane balancing on a special place for one segment transmission shaft.

从传动轴平衡的角度来看，传动轴并非刚体，在汽车高速旋转时，由于不平衡力的作用会使传动轴发生挠曲，如果将传动轴作为挠性转子进行平衡当然比较理想，但是不符合汽车大批量生产的实际，为减少挠曲振动，利用挠性转子平衡原理，对于单根传动轴，从特殊位置进行校正，从而以二面平衡代替多面平衡是可行的。

This article, using finite element method, calculated the assembly stress, working stress and modality parameter of hydraulic dynamometry rotor, and then simulatively researched the assembly and bearing process of the rotor.

本文用有限元方法计算了水力测功器转子的装配应力、工作应力及模态参数，进而，对转子的装配及承载过程进行了仿真研究。

Hydraulic dynamometry rotor was casted from brass alloy. Because of the working requirement for driving liquid, the laminas of the rotor are assembled slantways and have a complicated structure .

水力测功器转子是由黄铜合金铸造而成，由于转子工作时驱动液体的需要，叶片均呈倾斜状，结构比较复杂。

Different stator structures have an impact on the rotor eddy current loss and the rotor loss can be reduced by proper motor design.

定子结构对高速电机转子涡流损耗影响很大，合理地设计定子结构能够减小转子涡流损耗。

This engine utilizes the rotor round of epitrochoid and the outer rotor round of hypotrochoid the structure of combination, which does not need crankshaft, linkage and gas distribution agencies.

这种发动机是利用内转子圆外旋轮线和外转子圆内旋轮线相结合的结构，不需曲轴、连杆和配气机构。

Firstly, according to electromagnetic field theory, the 2-dimensional (2-D) mathematical model of a three phase squirrel-cage Y802-2 induction motor is developed. Then general equations can be deduced from finite element discrete and functional analysis. The motor's 2D solving region of electromagnetic field is given based on the boundary conditions and assumption conditions of the squirrel-cage induction motor. Through finite element mothod and inner–outer convergence method, magnetic field distributions and magnetic forces of bars can be calculated in following rotor conditions: health rotor, one single broken bar, two adjacent broken bars, two broken bars with one good interval, two broken bars with two good interval and four adjacent broken bars.

本文首先根据电磁场理论建立Y802-2型三相笼型感应电动机二维电磁场的数学模型，并对其进行了有限元离散以及泛函分析，推导出总体方程；在基本假设和边界条件基础上，给出笼型感应电动机二维电磁场的求解区域，然后应用有限元并结合内外双收敛方法，对样机稳态运行进行数值计算，得出电机在转子完好、一根导条断裂、连续两根导条断裂、间隔一根两根导条断裂、间隔两根两根导条断裂及连续四根导条断裂六种情况下的磁场分布和导条所受电磁力的变化情况。

Based on rubbing model of a two-disk rotor-stator system with consideration of both rotor and stator dynamics,a numerical integration program is applied to numerical simulation and analysis of the nonlinear dynamics of this system,such as bifurcation,Poincare section map,trajectory of axes,phase trajectory,frequency spectrum diagram and time response.

基于一新型径向-轴向复合碰摩双盘转子-机匣力学模型，利用数值积分和Poincare映射方法，对转子-机匣系统由于径向-轴向碰摩故障导致的非线性动力学行为进行了数值仿真研究，给出了系统响应随转速和偏心量变化的分岔图和一些典型的Poincare截面图、相轨图、轴心轨迹、幅值谱图和时域响应等。

ABSTRACT Aiming at problems of trans-vector controller in a vehicle-carried induction motor such as variable rotor and stator resistance following motor temperature, and their inductance varying with flux saturation degrees. Firstly, CSI and VSI are introduced, for CSI, it can hold the advantages both FOC and DTC using stator flux directional, PI parameter and simulation are also introduced. Secondly, equations of IM in the synchronous rotary frame and its static counterpart, as figuring in the saturation condition of magnetic field, are dealt in this paper and the simulation results are presented. Thereafter, the parameter designing of PI trans-vector controller is processed, which features the non-linear model. In practical realization, as neglecting the dynamical change of motor inductance, this paper employs online modification of inductance parameters, according to the flux saturation, then transforms the non-linear equations into linear ones, and so compacts the structure of controller. Thirdly, in view of the maximum torque output is extraordinary requisite when Electrical Vehicle start up, accelerate, and overtake, this paper issues the maximum torque when both inverter and battery capacity is corporeally definite. Fourthly, on-line differentiating and analyzing both rotor's time constants and its flux by using the expanding order reduction and discrete Kalman filter equation are fathomed, in order to realize high-performance trans-vector algorithm, and also the simulation results are presented. Fifthly, the close-loop regenerative brake system, when the EV's torque is set constant, is deduced; at the same time, unification of electric drive model and brake model is executed. Combined with maximum charge current demands, the mathematical model for online yielding torque as a demand.

本论文针对车载异步电机在矢量控制器所遇到的问题：定转子电阻随温度变化及随电机饱和程度变化的转子电感及定子电感而影响电机调速性能提出一套完整的解决方案：分析了电流型逆变器和电压型逆变器在实现矢量控制时控制器参数的计算，分析出对于电流型逆变器在采用定子磁场定向时，其性能同时具有矢量控制和直接转矩控制两者的优势，并对电压型逆变器在转子磁场定向下的模型进行了仿真研究；建立异步电机非线性模型，推导出考虑磁饱和时异步电机在同步旋转坐标系及静止坐标系下的方程，并做出了仿真结果，建立异步电机在非线性模型下的矢量控制调节器的PI参数设计，在实际应用中，若忽略电机电感的动态变化，可以根据当前的磁路饱和状态而在线修正电感参数，从而将非线性方程线性化，降低控制器的复杂度；考虑到电动汽车在起动和加速超车时需要电机有最大转矩输出，本文讨论在逆变器容量一定和电池供电能力有限的情况下电机最大转矩输出问题；推导了异步电机扩展降阶、离散卡尔曼滤波方程在线辨识转子时间常数和转子磁通，用于实现高性能的矢量控制算法，并给出了仿真结果；推导出了电动汽车恒转矩给定的闭环回馈制动系统，实现了电动控制模型和制动模型的统一，而且结合铅酸电池最大充电电流的要求，为制动转矩在线给定建立了数学模型；设计了基于双DSP系统的高性能矢量控制器软硬件框图，并以大量实验数据说明矢量控制在电动汽车应用的实际应用状况。

Unique control system: main rotor control from floor-mounted stick and collective through control mixer at base of main mast, then through push tubes in main mast to base of swashplate; last-mentioned is contained within mast and supported by a pushrod in rotor shaft.

独特的控制系统：主要由地面控制转子式棒，并通过控制混音集体在主桅杆的基础，然后通过在主桅杆推管，基十字盘

So the conclusion that the logarithmic decrement rule fitting for linear systems widely cannot be used in nonlinear unbalanced bearing rotor systems directly, therefore some reference are given to establish the new stability rule for nonlinear unbalanced bearing rotor system.

从而得出广泛适用于线性系统的对数衰减率准则难以直接推广应用于非线性不平衡轴承转子系统的结论，为建立适用于不平衡轴承转子系统的非线性稳定性准则提供了参考。

Diabetes is a social disease that affects several million people worldwide.

糖尿病是一个社会性疾病，全世界有数百万人罹患此病。

I'll call you on Friday to see if we can reschedule our luncheon meeting at your convenience.

我星期五会给您打电话在您方便的时候我们重新安排我们的午餐约会。