扰动

This paper reviews theoretical models, experimental investigations and mechanism explorations on the stall precursors in the axial-flow compressors.

本文从失速初始扰动的理论模型、实验研究和机理分析3个方面对轴流压气机失速初始扰动的研究进展进行了回顾。

Through experimental methods,an experimental study has been performed of the dynamic characteristics of heat exchangers with continuous spiral baffle plate s,which have water and oil to serve as heat exchange working media.

建立了可进行壳管式换热器动态特性试验研究系统，通过试验研究的方法对水-油为换热工质的连续螺旋折流板管壳式换热器动态特性进行了试验研究，进口流量扰动为等百分比流量特性，研究了4种流量扰动方式下水和油出口温度的动态响应。

The paper focuses on the surrounding soil disturbance by deep mixing column installation which is still unclear.

水泥土搅拌桩这类非挤土桩其施工扰动方面研究比较少，为此展开水泥土搅拌桩施工对桩周土的扰动研究。

Small blips can make big splashes, and big blips no splashes.

微小的扰动可能会溅起巨大的水花，而巨大的扰动却波澜不惊。

The effed Of three-dimensional perturbed velocities and three-dimensional perturbed current densities on the beam-wave interaction of plasma-filled dielectric Cherenkov maser is analysed by use of the self-consistent linear field theory without considering the effect Of the longitudinal guided magnetic field.The dispersion relation and the Simultaneous condition of the beam-wave interaction are derived. It is clearly shown that the instability of the interaction results from the coupling of the TM mode in t...

在无引导磁场的作用下，利用自洽线性场理论，分析了电子的三维扰动速度和三维扰动电流密度对填充等离子体的介质切伦可夫脉塞注波互作用的影响，导出了注波互作用的色散关系和同步条件，所得关系清楚地表明，其工作用不稳定性是由填充等离子体的介质筒慢波波导中的TM模与电子注模通过电子注耦合所致，并求得了电子注引起的频偏和波的增长率。

Computer numeric simulation and halfˉstuff simulatio n were put on control system.

基于小扰动理论，建立简易制导航弹的扰动方程，给出简易制导航弹控制系统的数学模型，进行简易制导航弹的气动计算，结合制导控制系统的设计对制导系统参数进行优化设计，并对制导控制系统进行计算机数字仿真、半实物仿真。

Depending on the degree of mechanical coupling between the drive motor and the head itself, missile motion will tend to disturb the head.

导弹的运动往往扰动头部，这种扰动的强度取决于驱动马达和头部的机械耦合的程度。

The Van der pol equation under impulse excitation can be used to simulate the development of perturbation along the body,and it can also explain the exponential growth of the disturbance energy.

采用脉冲激励的Van der pol方程可以很好地模拟扰动量沿轴向的发展过程，而且可以解释扰动能量的指数增长现象。

This thesis focuses on maximum-power-point-tracking algorithm applying for wind-turbine generator system. The system includes the serve-motor, induction generator, three-phase full bridge rectifier, buck converter and fixed load. This thesis uses traditional Current Perturbation Algorithm as well as Perturbation Stochastic Approximation Algorithm to implemented with Matlab/simlink and hardware to achieve the maximum power tracking.

本文针对风力发电系统提出最大功率追踪法则，整体系统架构包含了伺服马达、感应发电机、三相全桥式整流器、降压直流转换器和固定负载，并由传统电流型扰动观察法合并扰动近似演算法，进行Matlab/simlink 模拟与电路实作设计来完成最大功率追踪。

Power system stability in which any disturbances occurring have only small rates of change and small relative magnitudes.

电力系统稳定性的一种类型，其扰动量和扰动变动率相对较小。

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