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Aiming at these problems, a new method of knowledge hierarchical induction based on variable precision rough sets was proposed.

为解决其规则集规模大、实用性不强的问题，提出了一种基于变精度粗糙集的改模知识分层递阶归纳方法。

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。

Aiming at the two propositions (the theorem of three concurrent forces balance and the inertia moment of multimetric polygon), the paper represents and theoretically proves that the condition of three concurrent forces balance should be modified, i.

针对建筑力学中的三力平衡汇交定理和正n边形截面的惯性矩两个命题，提出了应该对三力平衡汇交定理的条件加以修正，即对三力平衡问题中的"三力平行"这种特殊情况不必设条件加以限制，并从理论上加以证明。

This article emphasizes on theoretic analyses on some key issues which are inexplicit or conflicting with other laws or regulations, aiming at concerns from competent authorities and experts so as to improve Chinese administrative ratification system.

本文从实践出发，对实施行政许可中急待研究和明确的问题，尤其是法律法规中未规定或者相冲突的问题在学理上进行了分析说明，希望引起有关方面或者专家的注意，以期完善我国的行政许可法律制度。

Aiming at different requirements for inexplicit transmission positions in V-cincture design described by some teaching materials and manuals, the paper pointed out that the design should be finished according to different mechanical transmission positions.

摘要针对一些教材、手册关于V带传动设计中传动位置要求不明确的问题，提出并分析了应根据机械传动不同的位置进行设计的观点。

Aiming at characteristics of land subsidence in Harbin City , based on investigation of settlement traces, the author used the layerwise summation method from the Rock Soil Engineering Reconnaissance Specification to calculate settling volumes of two infundibulum center regions, where are the Heavy Machinery Plant and Jiancaoling Town.

针对哈尔滨市区地面沉降特点，根据地面沉降痕迹调查，利用岩土工程勘察规范中的"分层总和"法，分别对两个漏斗中心重型机器厂和菅草岭的沉降量进行计算。

The bolt left the crossbow, and a black hole, small but inky, appeared where I had been aiming.

箭疾飞而去，一个又小又黑的洞出现在我之前瞄准的位置。

Although it is initially aiming at the corporate market, InPhase hopes its technology will eventually be available in consumer products, too.

尽管最初是针对企业市场，但 InPhase 希望它的技术最终也可以运用到消费性产品上。

Aiming at the characteristics of body state and physical enginery, this article gives some introduction on how to selection sport time sect, sport load and intensity, how to arrange sport way and times, and gives some sports prescription for olcl-aged illness. It would be instructively meaningful for old people to do exercises and to keep fitness.

针对老年人身体状态和生理机能等特点，在参加体育活动时老年人对运动的时间段选择，运动强度的确定，运动时间和次数安排，几种常见老年病的运动处方做一个较全面的简介，对老年人的保健和体育运动有一定的科学指导意义。

The system debugging and cautions in debug procedure are introduced in detail in the paper at last. Aiming at insufficience in design, some improvement suggestions are proposed.

本文最后对系统的调试过程以及调试过程中的注意事项做了详细说明，并针对该设计方案中存在的一些不足之处，提出了一些改进意见。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。