查询词典 nonlinear oscillations

A simplified nonlinear robust control algorithm is presented, which connects the exact feedback linearization with the closed-loop gain shaping algorithm.

将简化的精确反馈线性化法与闭环增益成形算法相结合，设计其非线性鲁棒控制器，增加了信息的传递量，在提高系统鲁棒性能的基础上，使该算法成为实际工程上可用的算法。

In addition,under some growth conditions on the nonlinear functions involved in the system,it is shown that the designed controller can be that the closed-loop system achieve finite gain L2 stabilizability.Accordingly,an estimate of the finite gain is obtained.

另外，针对哈密顿系统中的非线性函数提出进一步的演变条件，利用相同的反馈律使得闭环系统达到有限增益L2镇定，同时获得有限增益的估计值。

This paper adopted a course keeping nonlinear robust controller based on closed-loop gain shaping algorithm and exact feedback linearization algorithm and a speed robust controller which was based on closed-loop gain shaping algorithm.

该文采用基于闭环增益成形算法和精确反馈线性化算法的航向保持非线性鲁棒控制器与基于闭环增益成形算法的速度鲁棒控制器。

It is found that a codimension 2 bifurcation can be produced by a constant treatment rate, and a backward bifurcation occurs due to a nonlinear treatment rate.

发现了常数治愈率引起余维2分枝，非线性治愈率导致后向分枝，比较了标准发生率和双线性发生率对传染病演变趋势的影响。

Then we use above mentioned theory to study degenerate bifurcations of codimension two in nonlinear oscillator under combined parame-tric and forcing excitation. Thereby stability problems with double zero eigenvalues can be solved.

然后利用上述理论研究了参数激励与强迫激励联合作用下非线性振动系统的余维2退化分叉，从而解决了当解具有两个零特征值时解的稳定性问题。

7The local and global bifurcations and degenerate bifurcations of codimension threefor a nonlinear oscillator under combined parametric and forcing excitations are studiedin detail.

7研究了参数激励与强迫激励联合作用下非线性振子的局部分岔、余维3退化分岔和全局分岔。

In this article, a class of nonlinear elliptic boundary value problems with singular coefficient in one-dimensional domain was considered.first of all existence and uniqueness of the weak solution of the variational problem correspondin

本文考虑如下一维四阶非线性奇异边值问题 Lu=D~2p(xD~2u-Dp(xDu+pu=fx，u(x x∈I≡(0，1)u(0)=u′(0)=0 u(1)=u′(1)=0的有限元方法。给出相应问题广义解的存在唯一性和先验估计，并通过与解的E-范数投影相比较得到Galerkin逼近的L_2和最大

The functional coefficient model is widely applied to the analysis of longitudinal data, nonlinear time series and the biologic data.

本论文在第二章中重点讨论协变量区间删失时函数系数一维线性结构关系模型的估计问题。

It is pointed out that nonlinear regime of the friction coefficient curve is caused by rheological properties of lubricant.

计算中考虑了变形历史对剪应力的影响，并将计算结果与牛顿体计算结果以及实验进行了对比，指出摩擦系数曲线中的非线性区主要是由于润滑油流变性的影响造成的。

A numerical calculation program is written up for the various solution methods in this paper and the program is being used in various aspects of inverse problem of environmental hydraulics, including inverse problem in reverse process of one-dimensional unstable diffusion, inverse problem in reverse process of convection-diffusion, inverse problem for the dispersion coefficient in water quality model, The inverse problem of coefficient identification for nonlinear Boussinesq equation, parameter identification inverse problem for water quality model, the inversion of parameter of BOD-DO water model, the inverse problem of the source of convection-diffusion, identification of the steady-state permeability for two dimensional isotropic medium, two-dimensional steady inverse problem of convection-diffusion and parameter identification inverse problem for two-dimensional parabolic equation, etc.

对本文提出的各种算法，编制了数值计算程序，并把它应用于环境水力学反问题诸多领域，包括污染物一维非恒定扩散逆过程反问题，对流扩散方程逆过程反问题，河流水质纵向弥散系数反问题，非线性Boussinesq方程反问题，河流水质多参数识别反问题，BOD-DO水质模型参数反演问题，对流—扩散方程源项反问题及二维恒定各向同性介质渗透系数反问题，二维定常对流——扩散方程及二维抛物型方程参数控制反问题等。

The dissecting of samples in group2 were difficult. The root of pulmonary artery and ascending aorta failed to be unfolded because fibrous tissue was tough, right and left fibrous trigone were too firm to be solved by hand. Cardiac muscle fibers couldn't be stripped along myofibrillar trajectory since they were prone to break because of their friability.

组2的心脏解剖困难，表现为纤维组织坚韧，游离肺动脉非常困难；徒手无法松解左、右纤维三角，肺动脉和主动脉根部的游离非常困难；心肌纤维坚硬、质脆，解剖时容易断离成碎块，无法沿纤维走行方向剥离。

We have battled against the odds in a province that has become increasingly violent.

我们对在一个争夺日益激烈省的可能性。