阻尼法

For this theory, it is better than the traditional fixed damping conjugate gradient method.

从理论上讲，它要优于传统的固定阻尼共轭梯度法。

This work employs operator-splitting method / finite element method to study dynamic performance and the stability of liquid-lubricated herringbone grooved journal bearing with micro-polar lubricants. Load capacity, friction resistance, stiffness/damping coefficients and critical rotor mass were investigated.

本文采用算子分裂/有限元法计算微极性流体润滑剂的螺旋槽径向轴承承载力、粘性阻力、润滑油膜刚度系数和阻尼系数等特征量，研究轴承的动力特性和稳定性问题。

The governing equation of in-plane vibration of cable-restraint system is derived by means of D'Alembert principle, and then those partial differential equations are transformed into a set of ordinary differential equations by Garlerkin method. The method of Runge-Kutta integration is applied to solve the equation. The simulation analysis is made to prove that this vibration control has obvious damping effects and then the influence of cable tension, support mass, natural frequency and spring stiffness on the damping are discussed. Eventually, the approximate analytic solution of the optimum damping parameter is obtained to provide a simple and effective reference and design method for the engineers.

通过D'Alembert原理建立拉索－弹性约束系统振动方程，通过Galerkin方法将偏微分方程转化为常微分方程，应用龙格－库塔积分法求解方程；经过仿真分析，验证了该振动控制具有明显的减振效果，并且讨论了初始拉力、支座质量、振动频率及弹簧刚度对减振效果的影响；最后给出了计算最优阻尼参数的近似解析式，为工程师提供了简便有效的参考依据及设计方法。

Then, the natural frequency and the damping factor of machine tool was determined by experimental testing and experimental modal analysis method.

建立了切纸机刀床的力学模型，分析了主动隔振的原理及特点，利用试验刚试法和试验模态分析法确定刀床的固有频率和阻尼比。

Time history method is universal, it can solve displacement, velocity and acceleration of structure at every time during earthquake, so it can get shearing force, damping force and seismic force at every time.

而时程分析法是一种普遍适应的方法，可以求出地震过程中每一瞬时的位移、速度和加速度反应，从而也就可以得到每一瞬时的构件剪力、阻尼器出力和地震力。

In this way, it is easy to regularize discrete scheme and programming. Besides, the numerical solutions can be more steady and the convergent process faster.

为便于统一编程和利用有限边界元素法进行方程的离散，作者对粘性流场的控制方程组进行了标准化处理，通过在连续方程中引入内部阻尼项，使连续方程和动量方程及能量方程具有相同的标准化形式。

In chapter 3,we study the Zakharov-Kuznetsov-Modified Equal-Width equation by employing the extended Jacobi elliptic function expansion method and obtain some new solutions of Jacobi elliptic function type of the ZK-MEW equation.;Secondly,using sn-cn method,we study K(m,n,1) equation and obtained some new exact solutions when k=s=3,especially obtained abundand solitary solutions and trigonometric function solutions when m→0 and m→1;In chapter 4,Painleve singular analysis was applied to nonlinear PDE with variable coefficients.

第四章将Painleve奇性分析方法应用到带阻尼项的变系数Burgers方程中，并得到了该类Burgers方程具有Painleve性质的条件，给出了该类Burgers方程的Backlund变换，用所得Backlund变换得到了若干精确孤立波解，包括奇异孤立波解，这些解不等同于行波型孤立波解；用齐次平衡法得到了对数型DBM方程的Backlund变换，并获得了DBM方程的各种孤立波解，包括尖峰孤立波解和奇异尖峰孤立波解。

The three-dimensional motion equation of the cable-damper system is established and discretized by the finite difference method.

建立斜拉索—阻尼器系统的三维运动方程，并采用有限差分法进行离散化。

Based Hamilton principle and Galerkin method, the equations of nonlinear vibration of SMA damper-cable system have been set up.

根据Hamilton原理，结合Galerkin法，建立了SMA阻尼器—拉索系统的非线性振动方程。

This paper calculates the 3D magnetotelluric responses in homogeneous half space using integral equation method and apply the damped least square method to inverse the resistivity of 3D model.

采用积分方程法计算均匀半空间中三维异常体的大地电磁响应，然后利用阻尼最小二乘法反演得到地下三维异常体电阻率分布。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。