vector variable

This dissertation presents a definition of general offset curve, which has fixed offset distance, but variable offset direction. The offset direction is defined by the local coordinate system, which is formed of the tangent vector and the normal vector of every point on the curve.

本文利用曲线上各点的切向量和法向量所形成的局部坐标系来确定等距方向，从而给出一种广义偏距曲线的新定义。

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With the development of solid state power devices and DSP, variable frequency vector control based on DSP has been the trend for electromotor control.

随着电力电子器件和数字信号处理器的发展，基于DSP的变频矢量控制逐渐成为电机控制的趋势。

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Using linear control theory formed a high-speed electric spindle speed sensorless vector variable frequency control methods.

利用线性控制理论组成了 高速 电主轴无速度传感器矢量变频控制方法.

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In this paper, according to the equation of voltage vector of single-phase motor operating at symmetrical condition, author presents a new voltage-vector PWM method of variable frequency control for single-phase motor. In system, the voltage vector is used as a control parameter.

本文根据单相电动机对称运行时的合成电压矢量方程，提出了以合成电压矢量为控制量的单相电动机电压矢量式PWM变频调速控制方法，并进行了计算机仿真及制作了单相变频器。

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The vector control software of 12-phase cycloconverter-fed synchronous motor system is designed according to the fully digital variable speed system, based on two-level DSP. The arithmetic of the digital PI regulator and digital control of exciting current are also provided.

根据双DSP两级控制的全数字十二相同步电动机交交变频调速系统的特点，设计了一套矢量控制软件，重点给出了数字PI调节器的算法和励磁整流的数字触发程序；

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In this paper some partial derivatives of a matrix function with respect to a vector variable are derived first. By using of these derivatives, the representation of the normal approximation for any distribution density function of a random vector is given.

本文首先推导了若干矩阵函数对向量变量的求导公式，并以此为基础对任意的随机向量，给出其分布密度函数的正态迫近表示。

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The present study situation of variable vector propeller at home and abroad and the work concerned that has been done in Harbin Engineering University are introduced.

介绍了国内外针对全方向推进器的研究的现状以及哈尔滨工程大学在全方向推进器的研究方面所作的工作；

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The principle of the generalized vector method ( GVM) has been extended to the hexagonal crystal system material under the conditions of variable axial ratio and the mathematical model on it accordingly established.

将广义矢量法原理拓展到变轴比条件下的六方晶系材料，并建立了相应的数学模型。

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