查询词典 variable-density system

Research on characteristics of MCFC-GT hybrid system based on total energy concept This paper discusses the working performance of MCFC-GT hybrid system at diffirent work conditions. The results show that the hybrid system is high efficiency but the change range of work conditions is narrow. The work condition can be extended by a variable-speed gas turbine. However, this method of operation weakens the action of bottoming cycle.

2基于总能概念的MCFC-GT混合动力系统特性分析本文讨论了MCFC-GT混合动力系统不同工况下的工作性能，结果表明：MCFC-GT混合动力系统具有较高的发电效率，但系统的工况变化范围较小，可通过调节燃气轮机的转速来改善系统的变工况性能。

In the second chapter, the problem of the optimal inputting rate control for a class of competitive population dynamics system with age-structure is discussed. By means of characteristic line, Gronwall Lemma, Bellman Lemma, adjoint system and so on, the Lipschitz continuity properties of the system in terms of the control variable is certificated, and the necessary condition of the optimal control is obtained.

第二章讨论了一类具有年龄结构的竞争种群系统最优输入率控制问题，综合应用特征线法，Gronwall引理，Bellman引理，共轭系统等知识，证明了系统解关于控制变量的Lipschitz连续性，给出了控制为最优的必要条件。

It's an effective measure of fast valving in improving the dynamic stabilities of power system and preventing the overspeed of steam turbines, but the fast valving technique available can satisfy the need of modern steam turbines no more. On the basis of the new type fluid logic valve, which combines the regulating systems and safety systems happily, the steam turbine EHC based on new principle is put forward, one of its outstanding characteritics is, the fast valving is operating in a closed control loop. For the implementation of control for steam generator regulation and safety systems with nonlinear mult-operating modes, a new methodology for designing a fuzzy logic controller is proposed, which is based on the combination of"error phase plane"and"variable universe of discourse". Application of a double-mode FLC with the new methodology is presented, the validity of the design methodolody is desmonstrated by test; A new methodolody is also presented to improve the design and tuning of a FLC using variable structure control theory.

本文还详细讨论了快关控制在提高电力系统暂态稳定性及超速保护中的应用，分析了现有的快关控制规律的局限性，研究出一种基于新型快关阀的汽轮机电液控制系统，其突出特点是使汽轮机闭环快关成为现实，指出这种基于新的组成原理与设计方法的汽轮机电液控制系统对不同工况下的适应能力；针对汽轮发电机组多工况、非线性的特点，提出一种把&误差相平面&方法与&可变论域&思想有机结合的双模FLC设计与调整的新方法，试验结果表明该系统具有良好的动、静态特性；为改善FLC控制规则的设计与调整，作者还介绍了一种把滑模变结构理论成功应用于模糊系统设计的新方法。

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The varible of the response system is substituted with the variable of the drive system and the forcing synchronous components equal to zero so that the response system synchronizes with the drive system.

将驱动系统的变量替代响应系统的变量，使Lyapunov函数导数的强迫项变为0，响应系统与驱动系统达到同步。

First the moistures, temperatures and humidity factors of a granary are measured by the sensors as the secondary variable. Then the estimations of the gain states and the tendency of the change are realized by a neural network and a fuzzy inference system with the results of secondary variable.

通过分析水分传感器、温度传感器及湿度传感器所测量的二次变量的结果，利用神经网络和模糊推理技术来实现智能化粮情测控过程中粮食的状态及其变化趋势的估计。

By establishing the mathematical model of the variable displacement pump variable displacement motor volume speed-modulating system and dynamic simulation with the module of MATLAB/SIMULINK,analyzed and concluded the dynamic characters and impact factors,offer a theoretical basis for further application.

通过对变量泵-变量马达容积调速系统进行数学建模和利用MATLAB/SIMULINK模块进行的动态仿真，分析和总结了容积调速系统的动态特性及其影响因素，为以后的系统应用提供了理论依据。

In the design procedure, we do not need to know the specific values of the system parameters . We only require that the member functions of the input variable are triangular-shaped and the central values of the output variable member functions are selected in order to satisfy the stability expressions.

在模糊控制器的设计过程中，不需要知道对象的系统参数（A，b，c或A，B，C）的具体值，而只要求输入变量的隶属函数为三角形和输出变量的隶属函数中心值的取值满足稳定性条件所要求的关系式。

Based on the research on the theory and technology of dual-PWM variable frequency AC motor control, a design of dual-PWM variable frequency AC motor control system which has factor control loop rectifier and slip frequency speed regulator is proposed.

本文在总结和研究当前双PWM变频调速基础理论和常见技术的基础上，设计并研究了一种基于DSP的整流侧功率因数闭环、逆变侧转差频率控制的双PWM异步电机变频调速系统。

During the starting and lowspeed range, the stator windings are shortcircuited and the DFIM system is operated in variable frequency drive mode supplied by rotor side; in highspeed range, the motor works in doublyfed mode, so wide variable speed range can be achieved.

该系统在起动和低速段将定子绕组短路，转子侧采用变频调速运行方式，在中高速段则采用双馈调速运行方式，从而实现了双馈系统在宽转速范围内的平滑调速。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。