查询词典 numerical control

After a series of study of numerical method related to impact dynamics, such as the transient finite element discretization method of conservation equations, numerical quadrature and hourglass control, the identification and redefinition of sliding interface and so on, the dissertation is aimed at to study a high efficient.

在分析八节点六面体单元出现沙漏变形的物理原因的基础上，通过引入抗沙漏节点力消除了因单点积分引起的各种沙漏模态。

Meanwhile, this paper systematically summarized the present fractional-order control theory results distributed mostly in such aspects as continuous and discrete time domain analysis, approximated numerical analysis, common frequency domain analysis, plane locus method based on variable transposition, etc, and became an effective foundation of forming a complete control and system theory for fractional-order control systems.

同时，论文对当前国内外已有的分数阶控制理论成果进行了较为系统的整理，主要集中在连续和离散时间域分析、近似数值分析、一般复频域分析、基于变量变换的平面根轨迹分析等方面，具有综述性质，是建立一套完整的分数系统控制理论与系统理论的有效基石。

In order to control the propagation of errors and enhance the accuracy of numerical solution, the wilson-θ method is modified and the numerical stability of modified wilson-θ method is analyzed.

为有效控制误差的传递，提高计算精度，对Wilson-θ法进行改进并分析了改进Wilson-θ法的稳定性。

The application of H〓 control theory in robust control of sonar array servo system is studied in the thesis. The solution of singular H〓 control problem is investigated deeply, and the problem of sonar array servo system's generalized system being singular is solved. Numerical simulation is carried through at last.

本文还对H〓控制理论在声纳基阵伺服系统鲁棒控制中的应用进行了理论研究，对奇异H〓控制问题的解法进行了较深入的研究，并解决了猎雷声纳基阵伺服系统增广系统为奇异控制对象的控制问题，最后进行了数字仿真。

The key elements and techniques of the numerical wind tunnel are studied and analyzed.The basic idea of CFD is expatiated and the whole working process is presented.Discrete methods of the control equations based on the finite volume method and the PISO algorithm about the fluid numerical computation are researched also.

对基于CFD的数值风洞关键基础和技术进行研究分析，阐述了CFD的基本思想，研究了基于有限体积法的控制方程的离散方法以及流场的数值求解的PISO算法。

Through theoretic reckoning and simulating analyzing, several control strategies for shunt APF were compared and chose ip-iq arithmetic ofthe instantaneous reactive power theory control strategy as the right scheme to produce the instructing current. Based on it, some new control arithmetic was subjoined to suppress the resonance in system and balance the dc side capacitor voltage. Two topologies of main circuit were compared and chose the three-phase voltage-source converter with a split-capacitor as its main circuit structure. The numerical scales of the dc side capacitor and inductance of reactors were calculated. The high-pass filters were designed to eliminate effectively the highfrequency harmonics produced by APF.

通过理论计算和仿真分析，比较了并联型APF的几种控制策略的优点和缺点，从中选择瞬时无功理论控制策略i_p-i_q计算方式为指令电流产生的算法，并在此基础上增加了抑制系统谐振和平衡直流侧电容电压的控制；比较了并联型APF主电路的两种常见形式，从中选择了三相电压型变流器的主电路形式；算出适合该APF的直流侧电容和出线电感的参数；设计出能有效消除APF产生的高次谐波的高通滤波器。

Focusing on this practical engineering problem and by researching on some relative enterprises, this article intends to describe the dust generation mechanism, diffusion rules, control technology of dust by means of theoretical analysis and numerical simulation in coal washery, and put forward a comprehensive plan of dust control which takes bag filter as main dust removal equipment, and make an optimal design of air delivery and positioning, to realize the optimal control of dust.

针对这一工程实际问题，通过对相关企业的调研，本研究对选煤厂中粉尘产生机理、扩散规律及控制技术进行理论分析和数值模拟；并提出以除尘器为主要设备的粉尘治理综合方案，并对其风量、安装位置等工艺参数进行工程设计，以实现对粉尘的最优化控制。

Controling the system adopted 889 C51ses single slice machine as the CPU of system, spreading the position variety of the feeling method examination pot by electric control valve apacity type, position variety to should of the amount of emulation make use of A/D a conversion to get into CPU to carry on a control to the fuel control valve moderate breezes door switch for the numerical quantity.

控制系统采用了8位89C51单片机作为系统的CPU，以电容式传感方式检测锅的位置变化，位置变化对应的模拟量利用A/D转换为数字量进入CPU对燃料控制阀和风门开关进行控制。

Under the premise of a rotor system satisfying the quasi steady-state condition, the influencing coefficient method based on the steady-state rotor balancing is extended to single-plane or multiple-plane gain-scheduling control of a rotor with slowly varying speed and all factors affecting the stability of a gain-scheduling control are analyzed. Numerical simulations verify that the gain scheduling control can effectively suppress imbalance-induced vibration of a rotor with slowly varying speed.

在转子系统满足准稳态条件前提下，延伸基于转子稳态平衡的影响系数法到慢变速转子单平面或多平面增益调度控制，分析了影响增益调度控制稳定性的诸因素，以数值模拟证实了增益调度控制能有效地抑制慢变速转子的不平衡振动。

Firstly, based on the sliding mode control and backstepping technique, a new attitude tracking controller is derived to control the attitude motion of spacecraft, the stability of the system is analyzed via Lyapunov method and the reaction wheel dynamics is also considered from the real applications point of view. The whole design process is divided into two steps: the first step is to use sliding control technique to design suppositional adaptive variable structure controller; and the second step is to design attitude tracking controller based on SMC and backstepping technique. Numerical simulations are performed to show that both tracking maneuver and vibration suppression can be accomplished effectively.

首先，采用自适应后步法结合主动振动控制技术设计了姿态跟踪鲁棒控制器，基于Lyapunov方法分析了系统的渐近稳定性；在此基础上，显性地考虑了执行机构动态特性问题，将整个设计过程分为两个步骤：第一步采用滑模控制技术设计了变结构虚拟控制器，给出自适应控制律的设计方法；第二步，将后步法与滑模控制技术相结合，设计了姿态跟踪鲁棒控制器，给出飞轮电压的输入算法及稳定性分析；最后，将提出的控制方法应用于挠性航天器的姿态跟踪控制，通过数值仿真对所提方法的可行性与有效性进行分析和验证。

This brought fixed cost, but it also is meant at the same time use a source to won't make you singlehanded assume a problem.

这带来了一定的成本，但它同时也意味着使用开源不会让你独力承担问题。

He gained a small fortune in real estate.

他在房地产上发了一笔小财。