查询词典 numerical system

In this thesis, the problems, related with research of automatic and precise homing of parafoil system, were analyzed thoroughly and systematically in method of theoretical analysis and numerical simulation, including dynamics, trajectory design and trajectory following.

本文以&实现翼伞系统自主、准确归航&为中心，采用理论分析与数值仿真相结合的方法，对翼伞系统动力学、航迹规划和跟踪控制问题进行了比较系统深入的研究，得到了若干有意义的结论。

The numerical experiment shows that the parallel OVALS system gains a 17.45 speedup when running with 36 processes.

数值实验表明，OVALS并行系统在36并行规模下取得了17.45的并行加速比。

Residential quarantine period space ; numerical simulation ; ventilation system ; computational fluid dynamics

居家隔离空间；数值模拟；通风系统；计算流体力学

In chapter 3, the effect of the relative phaseΦbetween the probe and driving fields on gain and dispersion from different aspects in an open quasiΛ-type four-level system by the numerical solution of the steady state is investigated.

第三章从不同角度分析了探测场和驱动场之间的相对位相Φ对探测场增益以及粒子数差的影响。

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 paper briefly introduces constitutes and application of numerical simulation analysis system of gas dynamic performance for marine turbine s inlet valve box .

概要介绍了船用汽轮机进汽阀箱气动性能的数值模拟分析系统的构成及其应用。

Numerical results show that torsion angle plays more important role in conducting behavior of the system with the dithiocarboxylate anchoring group.

结果发现添加官能团对4，4\'-二巯基联苯分子电输运性质影响不显著，但是连接方式的改变对分子电输运性质影响显著，双硫原子的连接方式比单硫原子的连接方式更加有利于分子的导电。

This paper elaborates,in the lathe numerical control system GSK 996T,under the condition of guarantee of cutting accuracy,how reasonable use of the tool is made by setting proceed complex components repeatedly when there is no four-way tool post in machine tool body,i.

本文阐述了在GSK996T车床数控系统中，当机床本体没有四方刀架，即只有排刀架时，在保证切削精度的前提下，如何利用多次对刀对复杂零件进行合理加工。

The system measured the tool angle, corner radius and cutting edge of tools, against the tool wear of numerical control machine and machining center.

针对数控机床及加工中心中的刀具磨损，对被测刀具的刀尖角、刀尖圆弧半径和刃口情况进行测量。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐