共查询到16条相似文献,搜索用时 296 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
强耦合振子可用于微弱脉冲信号的检测和波形恢复,但其对微弱脉冲信号的检测频率会受到系统内置频率的限制.在系统内置频率固定的情况下,系统只能对一定频率范围内的脉冲信号进行有效检测和波形恢复,在检测更高频率的脉冲信号时会出现波形失真.本文分析了耦合振子内置频率和微弱脉冲信号检测频率之间的关系,提出两种改进强耦合振子结构以扩展微弱脉冲信号的频率检测范围.通过引入非线性恢复力耦合项,非线性恢复力强耦合振子可以有效保留信号的高频分量,在更高频率的脉冲信号输入时也能较好地保留信号特征.双振子强耦合系统通过引入Van der Pol-Duffing振子,加强了系统内部结构的稳定性,同样达到了扩展脉冲信号频率检测范围的效果.此外,基于变迭代步长和混沌检测的频率相关性,提出了一个未知频率脉冲信号检测方法,以改变迭代步长的方法代替改变系统内置频率来进行频率扫描,并且利用混沌检测的频率相关性,将接收信号和恢复信号的相关系数和纯噪声输入情况下的相关系数进行对比,根据两个相关系数之间的明显差异可以有效检测出脉冲信号.通过仿真实验进行验证,所提方法可以有效检测出未知频率的脉冲信号,并且所提的改进强耦合振子结构相对于... 相似文献
9.
研究了一类非线性尘埃等离子体孤波解. 首先构造一个变分迭代, 其次决定系统的初始近似, 最后通过变分迭代方法得到了对应模型的各次近似解.
关键词:
等离子体
变分迭代
近似解 相似文献
10.
《物理学报》2005,54(12):I0001-I0064
PACC题目作者年卷(期)起始页码0000总论0200一类厄尔尼诺海-气振子机理的摄动解莫嘉琪林万涛王辉200554(9)39670200热带海-气耦合振子的摄动解莫嘉琪林一骅林万涛200554(9)39710200弹性力学的复变量无网格方法程玉民李九红200554(10)44630200弹性细杆弯曲的Kirchhoff方程的违约校正求解黄磊包光伟刘延柱200554(6)24570200一类厄尔尼诺海-气振子机理的同伦解法莫嘉琪林万涛200554(3)9930210基于形态矩阵的图像模糊匹配方法王熠翟宏琛母国光200554(5)19650230用推广的李群约化法求解非线性薛定谔方程阮航宇李慧军200554(3)9960230非线性Sch… 相似文献
11.
The sea--air oscillator model of decadal variations in subtropical cells and equatorial Pacific SST
下载免费PDF全文
![点击此处可从《中国物理》网站下载免费的PDF全文](/ch/ext_images/free.gif)
In this paper a time delay equation for sea--air oscillator model is
studied. The aim is to create an approximate solving method of
nonlinear equation for sea--air oscillator model. Employing the
method of variational iteration, it obtains the approximate solution
of corresponding equation. This method is an approximate analytic
method, which can be often used for analysing other behaviour of the
sea surface temperature anomaly of the atmosphere--ocean oscillator
model. 相似文献
12.
The homotopic method of travelling wave solution for El Nino tropic sea-air coupled oscillator
下载免费PDF全文
![点击此处可从《中国物理 B》网站下载免费的PDF全文](/ch/ext_images/free.gif)
The EI Nimo and Southern Oscillation (ENSO) is an interannual phenomenon involved in the tropical Pacific sea-air interactions. In this paper, an asymptotic method of solving nonlinear equations for the ENSO model is proposed. And based on a class of oscillator of the ENSO model and by employing the method of homotopic mapping, the approximate solution of equations for the corresponding ENSO model is studied. It is proved from the results that homotopic method can be used for analysing the sea surface temperature anomaly in the equatorial Pacific of the sea-air oscillator for the ENSO model. 相似文献
13.
14.
15.
Modified variational iteration method for an El Ni no Southern Oscillation delayed oscillator
下载免费PDF全文
![点击此处可从《中国物理 B》网站下载免费的PDF全文](/ch/ext_images/free.gif)
This paper studies a delayed air-sea coupled oscillator describing the physical mechanism of El Niño Southern Oscillation. The approximate expansions of the delayed differential equation's solution are obtained successfully by the modified variational iteration method. The numerical results illustrate the effectiveness and correctness of the method by comparing with the exact solution of the reduced model. 相似文献