神经网络辅助卡尔曼滤波技术在组合导航系统中的应用研究

考虑到组合导航系统的噪声具有非先验性，而传统的卡尔受滤波器要求假设动态模型和观测模型的噪声统计特性已知，提出了用前向神经网络来辅助调节卡尔受滤波器，使其具有自适应能力以应付动态环境的扰动。仿真研究表明：该算法优于标准卡尔曼滤波器。     

参数噪声对一维耦合映象格子的影响

研究了一维对称耦合映象格子受局部反应参数噪声的影响。对系统最大Lyapunov指数与加入噪声的系统最大Lyapunov指数进行了数值比较。发现在不同参数下噪声既可诱导有序 ,也可诱导混沌。     

用散粒噪声测量碳纳米管中Luttinger参数

将碳纳米管的载流子输运用基本电荷为ge的Fermi液态模型描述，利用散射理论计算出纳米管中的零频率散粒噪声，在绝对零度下，存在一个强势垒的碳纳米管的散粒噪声为2geI.提出了一种测试纳米管Luttinger参数的新方法：在纳米管上形成一个强势垒，通过测试其散粒噪声，就可以计算出g因子. 关键词： 碳纳米管 Luttinger参数 散粒噪声 散射理论     

Analysis of characteristics of sound radiation from double cylindrical shell coated with viscoelastic layer

The characteristics of vibration and sound radiation from a double shell with the outer shell coated with viscoelastic layer are systematically studied. The shell‘s motion function is expressed by the classical Fliigge operator and the layer‘s motion function is described by three-dimensional Navier equations, whose displacement solutions are expressed by Taylor expansion along the layer thickness. The continuity conditions of displacement and stress between the shell and the layers are used in obtaining the vibration equations. The effects of layer thickness, modulus of elasticity, the loss factor, and the hydro-compressibility on the structural acoustic characteristic are discussed in detail. It showed that the higher the modulus of elasticity is, or the thinner the thickness of layer is, or the smaller the loss factor is, the higher the sound radiation power is.     

Coherence Resonance in the System with Periodical Potential and Driven by Correlated Noises

We study the ratchet model with both thermal and potential fluctuations, discussing analytically the coherence resonance of the particle moving in such a potential field. It is found that the correlation between the thermal and potential fluctuations has significant effect on the coherence of the system, i.e. negative correlation enhances the coherence of the system greatly, and with positive correlation, there appears the phenomenon that the coherence suppression and enhancement occur alternatively as the additive noise becomes larger.     

含双噪声源电路的类WKB法研究

本文首次尝试利用ＷＫＢ方法对双噪声原电路的Ｖａｎｄｅｒ Ｐｏｒ方程进行了讨论，并对倍加ＯＵ噪声和可加白噪声下的系统进行了数值计算，所得结果对调节含噪声源的电路有一定指导意义。     

油井套管错断口爆炸处理的有关理论分析

研究油井套管由于错断,无法使下井工具通过情况下,采用爆炸方法打通错断口。文中给出错断口的爆炸工艺实施方法及有关理论分析。     

同步泵浦飞秒激光锁模理论研究

考虑到饱和增益、饱和吸收、群速弥散和自相位调制等效应对光脉冲的作用,我们给出了一个适用于飞秒脉冲激光系统的锁模方程。并且用这个方程初步地研究了同步泵浦被动锁模的染料激光器。结果表明,染料光脉冲的输出特性将极大地取决于腔内色散、S参数、饱和吸收体的浓度、腔长失谐量等因素。     

基于B样条迭代法的激光光条噪声去除技术研究

在基于线结构光的视觉测量系统中,激光光条中心的提取精度是影响系统最后精度的关键因素。目前常用的光条中心提取方法都没有去除光条上的干扰噪声,在分析现有方法的基础上提出了一种利用B样条迭代去除光条噪声的方法。以光条上的点作为控制顶点拟合B样条曲线,在同一位置下用B样条曲线上的点取代噪声点,这样反复修改噪声点的位置使其逐渐逼近实际曲线,从而达到去除噪声的目的。利用重心法提取去噪后光条的中心,着重分析了参与运算的像素的取值范围。通过对比实验证明该方法的提取精度远高于其它方法,从而验证了去除噪声的有效性。