查询词典 variable-density system

Like others in the VQ family, the 4.0-liter version includes such advanced design features as lightweight aluminum block and cylinder heads, Continuous Valve Timing Control, Nissan variable Induction Control System, silent timing chain and microfinished camshaft and crankshaft surfaces.

像其他的VQ系列的4.0升版本，包括诸如轻质铝缸体缸盖，连续气门正时控制，日产可变感应控制系统，以及无声正时链和微抛光凸轮轴和曲轴先进的设计特点表面。

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。

In accordance with the acting mode of the actuator in aerospace control engineering,and based on infinite dimensional model of the system,a kind of simple and easily implemented variable structure control law is presented.

针对航天控制工程中执行机构的工作模式，基于系统的无穷维模型，本文设计了简单易行的变结构控制方案，并证明了相应的闭环系统的渐近稳定性。

The development of human is a self-organization system whose open degree is decided by input and output variable.

人的发展是一个由输入与输出变量决定开放程度的自组织系统。

Power system ; Short-term load forecasting ; Fuzzy-rough sets ; Input variable selection ; Neural network ; Data mining

电力系统；短期负荷预测；模糊粗糙集；输入变量选择；神经网络；数据挖掘

FEEL COMPUTER, A mechanical device sensing airplane speed for supplying variable pressure input to the elevator control system.

感觉计算机，为向升降舵控制系统输人可变压力而感应飞机速度的机械装置。

The method of slide-mode variable structure control is such a strategy that is characterized of low mathematical model precision, insensitiveness to system parameter variation and external disturbances, omission of parameter identifications, fast dynamic response and easy implementation. These advantages make it suitable to high performance vector controlled AC motor drives.

滑模变结构控制是一种强鲁棒性的控制方法，对系统数学模型精度要求不高，具有快速响应、对参数及外部扰动变化不敏感、无需系统在线辨识，实现简单而且很适合计算机实现等优点，因此，很适合高性能的交流电机矢量控制系统。

In the system board in the course of a number of variable factors of instability.

在制板过程中有许多可变的不稳定因素。

Exact and real-time detection of the instantaneous variable harmonic and reactive current in power system is the premise for compensation of active power filter.

实时、准确地检测出电网中瞬态变化的谐波与无功电流是有源电力滤波器进行精确补偿的前提。

The integration of the operator manual within the displays makes it possible to use the real time process variable values to explain the control functions to the user of the system.

在画面中集成操了作员手册就可以使用实时过程变量值为系统用户解释控制功能。

The reasons of iron ions content overproof in grade Ⅱ desalting water system,such as variation water quality,contamination of regenerant , operation adjustment of pretreatment system and switching operation of bed were discussed.

对二级脱盐水系统中铁离子含量超标的原因，如来水水质发生波动、再生剂受到污染、预处理系统操作调整、床体运行切换等进行了论述。

You were hired to drum up new business, so go and do it.

公司雇你招徕新业务，你就做你的事好了。