查询词典 reference frame

The mathematical models of dual three phase induction motor in stationary reference frame were obtained,using the concept of vector space decomposition with loss of one stator winding excitation set.

摘 要：采用空间矢量解耦的方法建立了缺相双三相异步电动机在静止坐标系下的数学模型。

The internal model control method is introduced based on the dynamic model of asynchronous motor in d-q reference frame. And the design of stator current controller is proposed in detail based on rotor flux oriented vector control.

在同步速d-q坐标系下异步感应电机动态模型和解耦控制原理的基础上引入了内模控制方法，详细设计了基于转子磁链定向和内模控制的定子电流调节器。

Here the scene and road are not changed. Moving objects are only the voitures and passengeres. When there are not the voiture and passenger, the screen image is considered as a reference frame.

缺点是该方法仅对背景变化不大且无其它运动物体与噪声干扰时处理较准确，这一理论已用在交通安全的监控中。

However, unlike the light source relative to the rest of the observer to see is the colorless astigmatism, and the light source relative motion of the observer to see is the red-shift light ( achromatous astigmatism occurs redshift of red-shift light ); Although the different inertial reference frame of the observer can see the speed of light, after the Lorentz transformation is the same as after c; but a different observer are exposed to the light energy is not the same achromatous (astigmatism energy and achromatous astigmatism occurs after the red-shift of red-shift of the light energy is out of the same ).

但是，与光源相对静止的观察者看到的是无色散光，而与光源相对运动的观察者看到的是红移光（无色散光发生红移后的红移光）；虽然，不同惯性参照系的观察者看到的光速，经过洛伦兹坐标变换后都一样为c；可是不同的观察者所承受到的光能量是不相同的（无色散光的能量和无色散光发生红移后的红移光能量是完全不相同的）。

In order to scientifically manage exploration data, three-dimensional database composed of rock mass quality indices is established under the geodetic reference frame. Those indices are obtained from adits, drill holes and outcrops.

大型水电工程往往积累有丰富的勘探资料，如何科学地管理这些资料并将其直观、准确地反映在工程地质图件上，即将岩体结构类型及岩体质量空间变化特征以图形展示，是当前研究的重点和难点之一。

According to field synergy principle and entropy generation minimization, the integration design concept is developed to improve thermal performance of forced air convection cooling system.Based on the hexahedra mesh the numerical simulation is carried out on systems of fan and streamlined heat sink with Multiple Rotating Reference Frame and RNG k-ε Modle.

在科技发达的21世纪，电子组件制造技术都朝轻、薄、短、小的方向发展，电子设备的结构设计也趋向紧密性，这种趋势会使得单位容积下热载荷急剧增加，因此必须配置适当的散热装置将热量排除，以维持组件运转的稳定性与可靠性。

According to the principle of vector control system, a simulation model of SPWM inverter - fed induction machine and its control system with the reference frame fixed to the rotor is established in this paper.

该文根据感应电机矢量控制的基本原理，基于MATLAB／SIMULINK构造了电压型SPWM逆变器供电的感应电机按转子磁场定向的矢量控制系统的仿真模型。

The parameters of the machine are measured by no-load test and short-circuit test. The relationship between the exciting current and corresponding air-gap voltage at the rated frequency is obtained, thus determining expressions for exciting inductance and exciting current in linear segment form. The equivalent circuits in a/30 reference frame are based on the parameters by above tests.

通过空载实验和短路实验对异步电机的参数进行了测量，由额定频率下的空载实验测得不同激磁电流与相应的气隙电势，给出了激磁电感与激磁电流的分段线性表达公式，为得到αβΟ坐标系统下的等值电路奠定基础。

This new approach is based on the arbitrary movement of the reference frame, which is continuously rezoned in order to allow a precise description of the moving interfaces and to maintain the element shape.

并由此导出自动分块技术，不但可以减缓对流，而且能够避免元网格缠绕，提高了计算有效性。

A simulation model of six-phase induction machines is proposed in stationary reference frame, and the actual implementation of the model is explained in detail with the help of Matlab/Simulink.

对于由变频器供电的交流电机来说，定子绕组的相数可以被当作一个新的自由参数。对于电机设计者来说，多相的优势在于磁动势波形的改善，线电压的减小以及效率的提高。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。