查询词典 frame of reference

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。

Through the design and practice of light-type steel structure, the author introduces the design elements of the workshop's pile, beam, roofing purline , node and rigid frame's zoccola with the structure, in order to make the structure more economic and rational, which to offer a reference for engineering and technicians.

通过轻型钢结构的设计与实践，介绍了其结构厂房柱、梁、屋面檩条、节点及刚架柱脚的设计要点，从而使结构变得更经济合理，对工程技术人员具有一定的参考价值。

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。

Due to the incoordination of the realism and the theory,and use the overseas experience for reference,the scholars begin to discuss how to build the long-term mechanism in corporate carrying out the social responsibility under the social regulation frame.

针对这种现实与理论的不符，本文借鉴国外加强企业社会责任的措施经验，对如何在社会性规制框架下建立企业履行社会责任的长效机制进行探讨。

Then data was stored in two chips of SRAM memory according to frame/line timing reference and pixel clock.

再采用两片SRAM存储器根据帧/行同步信号和像素时钟存储数据。

Based on a study of the passive articulated rover,a complete suspension kinematics model from wheel to inertial reference frame is presented,which uses the D-H kinematics model method of manipulator and presentation with Euler angle of pitch,roll,and yaw.

以被动关节式地形自适应月球车为研究对象，融合关节机器人D-H坐标建模方法构建了月球车悬架运动学模型和以侧倾、俯仰和偏转角表示姿态的欧拉角方式建立了车轮到世界坐标系的悬架完整表达模型。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。