查询词典 dynamical friction

In Chapter 2, the introduction of the dynamical models is presented, furthermore, on the basis of analyzing perturbation factors there are two dynamical models fit for the motion situation of the NEAs, which are imported as the restricted authentic particle model and the restricted mean particle model (with respect to the treatment of the orbits of the perturbing major planets) that the Post-Newtonian effect is also taken into account, while for the latter the influence of the 5/2 (or 2/5) resonant items of the interaction between the Jupiter and the Saturn is considered.

第二章是关于力学模型的介绍，在分析摄动因素的基础上，引入了近地小行星运动中比较合适两种力学模型，即限制性质点真实模型与限制性质点平均模型(这一平均指的是对摄动源大行星轨道的处理)，在两种模型中均考虑了后牛顿效应，另外在平均模型中还考虑了木星与土星之间的5/2(2/5)共振项的影响。

In the future, some issues need to be investigated further, which include: establish and study the low-dimensional dynamical system of turbulent jet, with the POD bases, the control of turbulent jet based on the low-dimensional dynamical system of turbulent jet, investigate the physics mechanism of intermittence shed-off of the vortex ring in turbulent jets in crossflow.

有待进一步研究的问题是：建立基于POD模的湍流射流低维动力系统，并对其进行分析；研究基于湍流射流低维动力系统的湍流射流控制；探讨湍流横向射流中涡环间歇脱落的物理机制。

At First, the thesis researches the dynamic characteristic of servo valve, model of dynamical outfit about valve control unsymmetrical hydraulic ram, influence of the additional disturbing force and the systematic static error, on the base of analysis of fatigue testing machine system. Then the mathematical models of position control system and force control system are built. According to the principle of load-matching, the hydraulic dynamical outfit and power source system are designed and components are chosen. Then the correlative parameters of system model are calculated and the simulation study is carried out.

研究了伺服阀的动态特性、阀控非对称液压缸系统的动力机构模型、附加干扰力的影响以及系统静差，继而建立了位置控制系统和力控制系统的数学模型，并在此基础上计算系统相关参数，对系统进行了仿真研究，进一步分析了系统的稳定性和可控性。

In static design of the control system, the influences of three-axle unintersect, unverticality and disturbance moment to the simulator's position accuracy is analyzed, and the error analytic formula is suggested. The influence of system static and dynamical friction moment, distinguishability of D/A convertor to the low-speed characteristic of the simulator is also analyzed.

在控制系统的静态设计过程中，分析了三轴转台的三轴不相交度、三轴不垂直度和干扰力矩等对转台位置精度的影响，并求出了误差的解析表达式，分析了系统的静、动摩擦力矩、D／A转换器的分辨率等对转台低速特性的影响。

The analysis results show the effect of non-symmetry film force, nonlinear stiffness and nonlinear friction force on dynamical behavior of rotor system has great relation with rotation speed. The chaotic behavior could exist in a widder parameter region, and the chaotic evolutive rule is more complicated.

发现非对称油膜力、非线性刚度和非线性摩擦力对转子系统动力学行为的影响与转速有很大关系，碰摩转子系统可以在较大参数范围内出现混沌运动状态，并且混沌运动的演化规律更为复杂。

When thecohesion and angle of internal friction is fixed ,the layer failure area becomessmaller with increase of shocrete layer's thickness.also the shotcrete layer has acritical thicknesswith the change of cohesion and angle of internal friction ofshotcrete'sinterface.

初喷接触面粘聚力和摩擦角强度一定时候，初喷破坏区随初喷厚度的增加而减少；接触面强度变化时，初喷存在一临界厚度；初喷破坏区主要集中在节理与洞周的相交处。

Treating with coils as aeolotropy, this paper brings forward a set of mathematical mode for computing internal stress distribution of coil in the process of coil coiling, in which some factors are taken into account, such as the transverse distribution of shape, crown and curl tension of the strip, the friction between the strip and the reel, the friction between strips, and etc. Because the reel shrinkage and the inner circle of the strip losing radial restrain and circumferential restrain can induce interlayer slipping and the change of the whole coil compactedness , the assumption concerned ——"virtual reel" in the process of coil uncoiling is put forward, which takes the form of slow action to express the uncoiling process and, therefore clearly simulates the variation course of internal stress distribution of coil in the process of coil uncoiling.

考虑到带材板凸度、卷取张力的横向分布以及带材与卷筒之间、带材与带材之间的摩擦力等因素的影响，并将钢卷按各向异性体处理，提出一套计算卷取过程中钢卷内部应力分布的数学模型；同时考虑到卸卷过程中由于卷筒的收缩，钢卷内圈失去径向和周向约束而引起层间滑移及整个钢卷紧密程度发生变化，提出钢卷卸卷过程中有关"虚拟卷筒"假设，将卸卷过程以"慢动作"的形式表示出来，清楚地模拟出卸卷过程中钢卷内部应力分布的变化历程。

The friction, which obviously, is a loss, results in the friction drag of the airfoil.

摩擦，这很明显，是一种损失，结果在摩擦拖曳的翼型。

Focused on many problems existing in pressure control system of drilling pipe friction welding,such as high failure rate and poor amenability,the basic principles of friction welding and electro-hydraulic proportional technique were briefly described.

针对焊接钻杆连续驱动摩擦焊机采用开关阀组成压力控制系统存在故障几率高、可控性差等问题，将电液比例控制技术应用在摩擦焊压力控制中，实现了摩擦焊轴向压力闭环控制、滑台进给速度的开环控制；可对摩擦焊机主轴速度、轴向压力、轴向缩短量、主电机电流、油温等进行实时检测。

The studied factors respectively are: length of soil nailing, insert deepness of piles, friction force of soil nailing interface, declination angle of soil nailing, horizontal spacing of soil nailing, rows of soil nailing, unit weight of soil, friction angle, unit cohesion, overload of slope, diameter of soil nailing.

这11个因素分别为：土钉长度、土钉直径、土钉界面摩擦力、土钉下倾角、土钉水平间距、土钉排数、土体重度、内摩擦角、粘聚力、坡顶超载、板桩插入深度。

Aquatic or marsh-growing fern allies; known to have existed since the Cenozoic; sometimes included in Lycopodiales.

生活于水中或湿地的蕨类；从新生代生存至今；有时归于石松目之中。

The engine was uprated from a 90hp Franklin to a 125hp Lycoming.

改良过的引擎是从90hp到125hp莱康明富兰克林。