EV demands IPMSM generate high torque while starting and running, which is the principal problem to be solved, including motor control structure and strategy selecting, precise detection of motor rotor position, precise detection of motor velocity, feasibility of the control method limited by hardware condition and realization of software program etc.
本文在IPM电机结构、原理、数学模型和工作限制曲线的基础上，对其矢量控制原理进行了详细地分析，并对直轴电流为零的控制、最大转矩电流比控制、弱磁控制及最大输出功率控制等矢量控制策略进行了深入分析。
The main research contents and results embody as follows: According to the two typical drawing simulation of box part and cylindrical part, it is arrived a main method in improving sheet metal forming ability as follows: in the qualification of not initiating the wrinkle, brought more particle in fillet region into straight flange region, in the meantime cause the particle in the straight flange region run more distance towards the middle region which resistance is the minimal. A theoretical study of new technique is developed in sheet metal forming base on virtual power principle. The results indicate that decrease the equivalent stressσ, improve the lubricate state in contact surface, decrease the area, the normal contact stressσn and the equivalent strain velocityεin initial principal deformation region, adjust and optimize the particle cycle flow of work piece flange face will greatly increase the sheet metal draw ability in room temperature conditions. And drawing hole forming technology is araised based on the analysis above.
本文的主要研究内容和结果体现在以下几个方面：根据两个典型的拉深工艺盒形件和筒形件拉深的数值模拟结果，研究得出为提高板料拉深成形性能而应采取的工艺措施是，在不引发起皱的条件下，使得圆角区域中的质点更多地进入直边区域中，同时使直边区域中的质点、朝着流动阻力为极小的中部区域移动更大的距离；依据塑性力学的基本原理——虚功率方程，基于提高板料的成形性能的目的，对虚功率原理关系式中每项参数的变化，进行了深入的分析后得出，在覆盖件的拉深过程中，可通过适当的工艺方法与措施，减小等效应力σ，改善接触面上的润滑状态，减少初始主变形区的面积，减小主变形区的法向接触应力σn的量值，减小主变形区的等效应变速率ε，起到调节与优化工件法兰面上的质点的周向流动的作用，以此为基础，提出了拉深孔的工艺措施即拉深孔成形新工艺。
Vector and coordinate transformation are used to analyse the work surface equation and the slip velocity between the cam and idler wheels, also the dynamic characteristics of pistons, cylinders and? principal axis of the contrapositive cam engine.
研究了对置式凸轮发动机的运动学与动力学特性，利用向量与坐标变换法分析了对置式凸轮发动机的工作曲面方程和滚轮相对滑动速度等运动学性能，分析了活塞、气以及主轴等部件的动力学特性。
The results show that the strain velocity mainly affects maximum principal stress.
研究结果表明，应变速率等因素对最大主应力的变化有一定影响。
Based on the principal of inspection, the 20cm and 60 cm reduce-scale models are designed and the model composition are also depicted, with which some relevant instruments are tested. Then the 100cm model is successfully completed on the basis of the reduce-scale models. In order to achieve precision, the time system, photoelectric sensor, servo motor and mechanical apparatus are tested according to the composition of the inspection system. Different precision for inspection system in different plans are figured out according to the results of all the factors: under low velocity condition(lower than 3cm/s), the precision for total station is from 0.4mm to 0.6mm, while the absolute and relative precisions for GPS dynamic surveying are 3mm -10mm and 0.5mm under low and median velocity condition(lower than 6m/s). the experiments and analysis for the dynamic precision of total station and GPS are carried out based on 100cm model, and the results of preliminary dynamic surveying and real-time dynamic surveying are gained through post-processing. Meanwhile, through the correlation analysis for surveying errors, the surveying delay ranges from 110ms to 124ms under different dynamic conditions. After the correction of surveying time-delay and the cooperated-target 360 degree prism, the errors are dramatically reduced: the vertical error and horizontal error are reduced from 1.02mm and 2.18mm to 0.83mm and 0.51mm respectively under the velocity of 0.9cm/s, which proves the effectiveness of error correction.
通过对几种潜在解决方案的分析，确立了最优方案；基于检测平台的基本原理，分别设计实现了20cm、60cm动态检测平台缩尺模型，完成了模型机械结构设计实践及部分相关设备的性能测试，在缩尺模型基础上完成了100cm检测平台的机械结构设计和性能测试；针对检测系统的组成分别对时间系统、光电位置传感器、电机及机械结构的精度进行了分析，根据各组成部分的精度得出系统在不同检测方案条件下的检测精度：低动态条件下(3cm/s以内)对于全站仪跟踪测量能够完成0.4-0.6mm精度的动态检测，中低动态条件下(6m/s以内)对于GPS动态测量能够完成3-10mm精度的动态绝对位置检测和0.5mm精度的相对位置检测；基于100cm检测平台开展了全站仪及GPS动态检测实践，通过事后处理的方法对全站仪在准动态和实时动态条件下的动态测量精度进行了检测，得到不同动态条件下的测量误差；通过相关分析，得到利用全站仪动态跟踪测量的时滞在不同动态条件下约为110-120ms，通过对测量误差进行时滞改正和合作目标360度棱镜的误差改正，取得了良好的效果，其中0.9cm/s条件下的水平位置和高程的平均误差分别从1.02mm、2.18mm下降到0.83mm和0.51mm。
The results show that the attenuation law of maximal vertical velocity amplitude and principal frequency accord well with test data.
对计算得到的最大垂直运动速度幅值和频谱进行拟合，结果与试验数据吻合较好。
In the paper, the kinetically admissible continuity velocity field of open-die cold extrusion for axis and open-die cold extrusion without mandrel for thick-walled tube are given with stream function method and the mathematical relations between deformation power and the principal parameters is established by means of upper-bound method.
李军本文应用流函数方法，给出了实心轴及厚壁管件无芯棒开式冷挤压成形的动可容连续速度场，运用上限法建立了变形功率与各主要参数间的函数关系。
Flue gas pressure pulse signals and temperature pulse signals are analyzed to obtain the effects of flue gas velocity and temperature on the principal fluctuation frequency of gas flow, and further to choose a proper sensor.
试验中首先对烟气流动所产生的压力脉动信号和温度脉动信号进行分析，研究烟气流速和温度对压力脉动主频的影响，以选用合适的传感器。
The corresponding velocity of pore water pressure in the rotation process of pure principal stress axes is mainly dominated by initial shear stress.
纯主应力轴旋转过程中的孔压上升速率主要受初始剪应力大小控制。
The conventional ground survey taking goniometry, ranging and leveling as the principal part for a long time is gradually being replaced by GPS technology with one-time determination of 3-D coordinates, high-velocity, high-efficiency and high-precision.
长期以来用测角、测距、测水准为主体的常规地面测量，正在逐步被以一次性确定3维坐标的高速度、高效率、高精度的GPS技术所代替。
After principal component analysis, it determined the most three informative impact parameter: early peak acceleration, peak velocity, peak displacement.
在进行主成分分析后，确定包含信息量最大的三个影响参数：早期峰值加速度、峰值速度、峰值位移。
On the basis of three-dimensional velocity field observation, the relationship between collection efficiency of straight-flow Cyclone tube with guide vanes and its principal structure parameters is presented.
用实测三维流场的方法，研究了导叶直流式旋流管的分离性能与旋流管主要结构参数的关系。
Firstly, We studied the maximum principal stress and horizontal strain during the deformation of single fold and multi-layer fold and the effect of strain velocity on fold deformation under compressive stress.
本论文首先主要对单层和多层褶皱（以相山数据为基础）变形过程中最大主应力的变化与水平应变之间的关系，以及应变速率等因素对褶皱变形的影响进行了研究。
It is believed that such a migration of strikes represents the concordant variation of in-situ maximum horizontal principal stress, which might reflect the changes of subducted velocity of oceanic crust near continental margin.
这种变化代表着原地最大水平主压应力的同向变化，应反映邻近陆缘洋壳俯冲速度的变化。
The scrap absorbing system was introduced in details, such as the constituent, determination of air velocity, pipeline arrangement, layout of scrap absorbing unit and the control and interlock between principal machines for edge cutting.
介绍了碎边吸收系统的组成、气流速度的确定、管道布置、碎边吸收风机的选择布置、与切边主机之间的控制连锁。
Results show that low vertical velocity of center of body weight during the jump phase is the principal contradiction and low flipping angular velocity during the flight phase is the secondary contradiction.
结果表明，主要矛盾是起跳阶段身体重心垂直速度偏低，空中阶段翻转角速度过慢则为次要矛盾。
Then we introduced the operational principal of GPS briefly, studied its capture model, solved the position and velocity information by a linearization algorithm, and established the GPS'error model.
其次介绍了GPS系统的工作原理，研究了GPS系统的捕获模型；最后采用了一种线性化算法进行位置和速度信息的求解，并建立了GPS系统的误差模型。