定向器

To understand the performance of DOA estimation using vector hydrophone array in a reflecting boundary, based on the reflecting model of plane acoustic wave, the improved Bartlett and Capon spatial spectrum are presented, and then the general frame is set up.

为了了解复杂分界面上矢量水听器阵列的定向性能，根据分界面上平面波的反射模型，提出了改进的Bartlett和Capon空间谱，建立了统一框架，并且在绝对硬边界典型界面下，分析了基于矢量水听器阵列的定向性能，给出了具体算例。

Under the existing condition of the lab, a lot of experiments, analyzing and improving are made. Now, the problems in photoengraving, sputtering and diffusion etc. have been solved elementally. Excellent technological parameters are achieved and 2×2 LiNbO3 waveguide optical switch has been fabricated successfully. At the end of this paper, the losses of 2×2 LiNbO3 waveguide type optical switch are analyzed. The testing system is established. The V-grooves used for coupling have been designed.

我们在现有的实验条件下，经过反复实验，分析和改进，克服了光刻，溅射，扩散等各个阶段中的难题，总结出各部分最优的工艺参数，制备出了2×2定向耦合器型光波导开关，在本文的最后对制备出的光波导开关的各种损耗进行了分析，建立了测试系统，对光开关进行了通光测试，并对本2×2定向耦合器型光波导开关以后的耦合封装V型槽进行了设计。

To give a handsel to.Rather than store data on internal disks, servers forward files onto SAN, where network devices such as directors or multiplexers, optimized to handle storage tasks, direct files to appropriate storage device.

服务器不是把数据存储在内部的磁盘上，而把文件转发给存储区域网，诸如定向器和多路转换器等网络设备优化存储任务的处理，把文件送到合适的存储设备上。

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。

In directional radar the directional characteristic is affected by nonideal sum and difference performance caused by small mismatch of microwave bridge port.

在定向雷达中，微波和差器的不理想性，对单脉冲雷达定向特性构成了一定的影响，这种不理想性主要由组成和差器的微波桥各端口的小失配形成。

The national defence basic project as background and the dynamic model of cotrolled transfer matrix for multiple launch rocket was created in order to reduce the initial disturbance of rocket projectile. The causes that affect the angle change of orientation locator were analyzed by the engineering system dynamic theory base on multibody system transfer matrix method. The simulation of dispersion for multiple launch rocket was implementation, and the affect law between the angle of elevation and side deflection and the control parameters was acquired. The control module was installed on the orientation locator of multiple rocket launcher to control the initial disturbance of rocket that provide new method and theory base and show the engineering system dynamic base on the multibody system transfer matrix method is effective.

本文以国防基础科研项目为背景，建立了通过控制定向器角运动来减小火箭弹起始扰动的多管火箭受控多体系统动力学模型，应用基于多体系统传递矩阵法的工程系统动力学理论，进行了定向器角度运动的影响因素分析，进行了受控多管火箭炮发射动力学和密集度数值仿真，得到了定向器俯仰和侧偏角控制参数对俯仰角和侧偏角的影响规律，为在火箭炮定向器上加装控制集成模块控制火箭弹的起始扰动和射击精度提供了新思路和理论基础，也表明了基于多体系统传递矩阵法的工程系统动力学理论的有效性。

Based on the analysis of control strategy of the system, this paper used respectively voltage oriented and stator flux oriented vector control in grid side and rotor side of the converter.

在分析了该系统控制方法的基础上，建立了交直交变频器网侧电压定向以及转子侧定子磁场定向的矢量控制系统模型。

The hardware system comprises a football locating emitter, a site corner orientation emitter, a vidicon, a radar velometer, a player locating emitter and a site vibration receptor. The software system comprises a plenty of computer program software developed for aiming at the hardware.

其中硬件系统由足球定位发射器、场地边角定向发射器、摄像机、雷达测速器、球员定位发射器及场上裁判振动接收器等组成；软件系统则由针对以上所述硬件进行开发的各种电脑程序软件等构件组成。

In this paper ,move ment pri nci ple of rocket i n direction pi pe was got by dy— namic si mulation ,and effect characteristic consideri ng contact stiffness ,detent force and nozzle thrust misalignment a— bout pitchi ng angle velocity was analysis .All the study set foundationfor further study of high—lowpressure launch sys— te m.

通 过发射仿真分析，获得了火箭弹在高低压发射系统中的内弹道变化规律，分析了火箭弹与定向器的接触刚度、耳轴扭转刚度、尾喷管推力偏心等因素对俯仰角速度的影响特性，所得结论为火箭武器高低压发射系统的进一步相关研究奠定了基础。

A grating tuned directional output device consisting of a rotating platform,a infrared grating and a plane mirror is introduced based on an optical angle reflector to realize the directional and positional outputs of different wavelengths,which has obtained 60 laser spectral lines with a resolution of 0.01 μm.

介绍了该激光器中基于光学角反射器原理设计的光栅调谐定向输出装置，并对其进行了理论计算和论证，实现了不同波长激光的定向、定位输出，获得调谐激光输出谱线超过60条，谱线分辨率优于0.01 μm。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。