Effectof Film Force Nonlinearity on Unbalance Responseof a Jeffcot RotorJournal Bearing System

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Nonlinear dynamic analysis of the whole vehicle on bumpy road

Through the research into the characteristics of 7-DoF high dimensional nonlinear dynamics of a vehicle on bumpy road, the periodic movement and chaotic behavior of the vehicle were found.The methods of nonlinear frequency response analysis, global bifurcation, frequency chart and Poincaré maps were used simultaneously to derive strange super chaotic attractor.According to Lyapunov exponents calculated by Gram-Schmidt method, the unstable region was compartmentalized and the super chaotic characteristic of the nonlinear system was verified.Numerical results by 4-order Runge-Kutta method presented the multiform dynamic behavior of the system.     

瞬变电磁法在防治矿井水害中的应用

为查明某煤矿81019工作面顶、底板岩层的富水性,采用了瞬变电磁法对其进行勘查,通过此种物探方法的定量解释,预测了该工作面的富水情况,为防治矿井水害提供了科学依据。     

单盘转子不平衡的瞬态动力响应分析

转子的不平衡是引起转子失稳的主要因素,对机器有着不利的作用;不平衡的响应特性是一个值得关心的问题。本文建立了单盘转子的运动微分方程,分析了在各个加速度条件下的响应特性,研究表明,不同加速度的不平衡瞬态响应有一定的规律,加速度越大,响应越小,相位越小;同时进动角速度可以分为三个区域波动。这些特性对于转子平衡有一定的指导作用。     

照度计特性及表示方法

本文对照度计特性及表示方法作了综合性论述。     

集成运算放大器的瞬态响应

将充分完善的二阶系统响应特性运用于集成运算放大器的分析，求得瞬态响应的有关参数；并提出如何用实验的方法来求得瞬态响应参数，进而判断集成运放相位补偿是否合理，有目的地修正相位补偿元件的数值，使集成运放达到既稳定，频带又宽的最佳工作状态．     

非线性RC电路的暂态特性

通过对一个可解的非线性RC电路模型的暂态过程的研究 ,得到非线性RC电路的一些普遍特性     

柔性转轴动力学分析与拍振现象

In this paper,the intrinsic behavior of rotating Euler-Benoulli flexible shafts was studied due to coupled bending and torsional vibratuions,the equations of motion of the shaft with unbalanced eccentricity and visous material damping were derived by the Hamilton principle.The numerical solution was obtained using the perturbation approach and mode-assuming method.The influences of the coupled vibrations between the benging and torsion.the rotaing speed,material damping and the slenderness ratio of the shaft were analyzed.It is clearly shown that the beating phenomena can occur when the interaction of torsion and flexure is considered.     

带章动阻尼器航天器的非线性动力学分析

研究带章动阻尼器航天器的非线性动力学特性.应用第二类拉格朗日方法建立航天器动力学方程,并对稳定性进行了分析;应用四阶Runge-Kutta法进行数值模拟,发现激励力矩增大时系统由倍周期运动变为混沌运动.     

用于心率变异信号分析的动力噪声干扰混沌系统建模(英文)

心脏动力系统可能是其内在动力学和外部环境影响的混合体,因此从心率变异信号中确定混沌现象非常困难．本文提出一种优化方法,获得一组由某种动力系统产生的时间序列,并使该序列与原始信号尽可能接近．对动力噪声干扰混沌模型进行了检验后,应用于心率变异信号分析时发现了正的最大Ｌｙａｐｕｎｏｖ 指数