余弦波

通过Matlab/Simulink环境下仿真，对三种PID控制方法进行比较，选取了控制性能最佳的PID控制方法，进行了阶跃信号、正弦波信号、余弦波信号和X-Y平面上的圆规迹信号位置跟踪控制。

By simulating in the Matlab / Simulink , we choose one of the best performance from three types of PID control methods to carried out the position tracking control of step signal , sine wave signal , cosine wave signal , and compass trace signal on X-Y plane .

选取3种裂纹开闭模型：方波模型，余弦波模型和综合模型，建立Jeffcott裂纹转子的振动微分方程。

Three kinds of open-close crack models including the rectangular wave model , the cosine wave model and the synthesized model , were applied to set up a vibration differential equation about a Jeffcott cracked rotor .

半地转近似下的混合Rossby－重力椭圆余弦波

Mixed rossby-gravity cnoidal wave under the condition of semi-geostrophic approximation

通过波浪水槽试验，利用ADV测量椭圆余弦波作用下不同底床情况，垂线上各点的瞬时流速。

The bottom boundary layer under cnoidal waves was studied by using Acoustic Doppler Velocimeter ( ADV ) technique in a laboratory flume .

结果表明，地球流体中的非线性Rossby波满足KdV方程，其有界周期解为椭圆余弦波。

We find that the Rossby waves in the geophysical fluids satisfy the well-known KdV ( Korteweg-de Vries ) equation , the bounded periodic solution of which is the cnoidal waves .

并且分别用Welch法和全相位法对在有色噪声中混入的双频小信号余弦波进行谱估计，实验证明全相位谱估计性能优于经典谱估计。

And according to the method of Welch and All phase , the power spectrum of double frequency small signal mixed in the colored noise is estimated , the simulation proves that the all phase spectrum estimation is better than classical spectrum estimation .

本文采用Isobe（1985）提出的一阶椭圆余弦波的直接数值计算方法，对均匀流场中一阶椭圆余弦波波要素的变化规律作了理论分析。

Using the method for calculating the first order Cn wave , developed by Isobe ( 1985 ), the changes of the first order Cn wave on uniform curr - ents are analyzed theoretically .

在一定的条件下，椭圆余弦波退化成孤立波。

Under certain conditions these waves degenerate into the solitary waves .

两层流体界面上的二阶椭圆余弦波

The Second Approximation to Conoidal waves at Interface of Two-fluid System

椭圆余弦波在垂直薄楔上的绕射

The diffraction of cnoidal waves by a thin vertical wedge

二流体系统中自由面及界面上的二阶椭圆余弦波

Second-Order Cnoidal Waves at the Free Surface and Interface of a Two-Fluid System

椭圆余弦波与直墙的相互作用

The interaction of cnoidal wave and vertical wall

椭圆余弦波在工程上的应用

The Application of Cnoidal Wave Theory

椭圆余弦波理论在击岸波研究中的应用

Application of the cnoidal wave theory to the study of surf the left bank of Zhongguancun

分层流体中的椭圆余弦波

Cnoidal Waves in Stratified Fluids

域内生成正弦波和椭圆余弦波的数值试验结果证实了该结论。

Numerical solutions of the equations with the internal generation of sinusoidal and cnoidal waves confirm this finding .

编制的计算程序可以求解复杂边界条件，入射波可选用线性规则波或椭圆余弦波等。

The programs can work for the seabed with complex boundary under the action of regular waves and cnoidal waves .

以斜坡上梯形潜堤为研究对象，在波浪水槽实验的基础上，分析斜坡上潜堤对规则波和椭圆余弦波传播变形的影响。

Flume experiments are carried out to observe and analyze the characteristics of wave propagation over submerged breakwater on the slope .

几种常见信号波形的逆变换计算（Ⅱ）奇偶对称三角波与锯齿波和整流余弦波的逆变换

Computing the Inverse Transform of Some Common Signal Waveforms (ⅱ) The Inverse Transform of Triangular Wave with Even-Odd Symmetry and Rectifying Cosine Wave

模型采用边界造波，可以模拟小振幅波、斯托克斯波、椭圆余弦波、孤立波等永形波。

Waves are generated at the boundary , which can simulate all kinds of theoretical wave such as small amplitude wave , Stokes wave , cnoidal wave and solitary wave .

基于一阶近似椭圆余弦波理论研究了浅水区非线性波浪对海底埋设管线的作用，求得了作用于管线上的渗流压力解析解，并同线性波浪理论结果进行了比较。

This paper studies the nonlinear wave action on a buried pipeline in shallow water areas based on the first order cnoidal wave theory , and presents an analytical solution for the seepage pressure . The results from this solution and those from linear theory are compared .

本文通过数模方法，探讨了线性规则波和椭圆余弦波作用下潜堤前后的波高变化规律、潜堤内部的孔隙流压力变化规律以及整个波浪与孔隙流的流场变化细节。

Numerical Simulation of Overtopping Against Seawall of Composite Profile in Regular Waves In the dissertation , the changing law of wave height before and after the breakwater and the pore pressure in it are discussed , also the details of the velocity of the whole flow field are described .