查询词典 damping-off

Chapter four studies the chaotic responses in a system consisting of simple pendulum and harmonic oscillator under bounded noise excitation. Firstly, the Melnikov function of the two-degree-of-freedom system under Hamiltonian perturbation is derived. The essential condition of the autonomous system for the probable onset of chaos is obtained, the Poincare maps of the system under small Hamiltonian perturbation and the effect of increasing perturbation on the Poincare maps are studies. Then for the non-autonomous system under damping and harmonic or bounded noise excitation, the largest Lyapunov exponent and Poincare maps are calculated. From the analysis of the largest Lyapunov exponent, the critical criterion for the onset of chaos, and the conclusion that the threshold of bounded noise amplitude for the onset of chaos in the system increases as the intensity parameter of Wiener process increases are obtained. The result from the analysis of Poincare maps is in agreement with that obtained from the Largest Lyapunov exponent. The effect of varying damping coefficient and intensity parameter of Wiener process is also analyzed.

第四章研究了有界噪声激励下的两自由度单摆—谐振子系统的混沌运动，首先推导了该两自由度系统仅在Hamilton扰动下的Melnikov函数，得到该自治系统可能产生混沌的必要条件；研究了该系统在小的Hamilton扰动和增大摄动情形下的Poincare截面；然后对有阻尼、谐和或有界噪声激励下的非自治系统数值计算了其最大Lyapunov指数和Poincare截面；从Lyapunov指数分析得到了这个两自由度系统产生混沌运动的临界条件及产生混沌的临界激励幅值随Wiener过程强度参数值的增大而增大的结论，Poincare截面分析的结果亦符合Lyapunov指数分析的结论；研究了Wiener过程强度参数、阻尼系数变化对Poincare截面的影响。

Considered the factor of damping,a single degree of freedom s dynamic model of the high-speed cam mechanism is established.Choosing the law of sine acceleration motion as the excitation function,a displacement and acceleration dynamic response equations of the main vibration phase and residual vibration phase,the working dynamic response change curve through the inferential reasoning working end movement equation is derived.The result is obtained that different period and damping ratio have different impact

建立了考虑阻尼因素的等效单自由度高速凸轮机构的动力学模型，以正弦加速度运动规律方程为激振函数，推导出了从动件系统主振段和余振段的位移和加速度动态响应方程并绘制出了动态响应变化曲线，得出了不同阻尼比和周期比对主振段和余振段的动态响应，从而为高速凸轮机构的合理设计提供了一定的理论依据。

The article put forward "the equivalent linearization methed for the nonlinear damping in the stationary random process" in order to solve the problems of nonlinear damping, which is widely adopted in automobiles.

为了解决汽车上广泛采用的非线性阻尼问题，文中提出"平稳随机过程中，非线性阻尼的等效线性化方法"，并给出一般形式的解答。

The effects of trace Ce and La on the damping capacity of aged Zn-22%Al have been studied using TEM,SEM and room temperature low frequence torsional pendulum damping meter.

采用自然时效、人工时效等热处理工艺，借助透射电镜和室温低频扭摆内耗仪，研究了微量Ce，La对高阻尼Zn-22%Al合金时效后显微组织和阻尼性能的影响。

The influence of structural damping coefficients on the peak value of the response of the vibration generator was investigated to determine the damping parameter according to the calculations of frequency response on the vibration generator.

通过对仿真模型进行频率响应计算，研究了阻尼对振动台响应峰值的影响情况，确定了各阻尼系数的取值。

The behavior and performance of the MR valve with both annular and radial damping gaps is expressed in terms of non-dimensional parameters and the efficiency of the MR hydraulic actuator system with the MR valves with both annular and radial damping gaps in Wheatstone bridge network is studied

同时推导了基于平板模型的同时具有圆环和圆盘阻尼间隙的磁流变阀的非量纲的体积流量，得到了桥式连接的磁流变阀工作时驱动泵效率的计算模型。

It introduces a kind of novel loading test system, based on the operation principle of damper. this loading system is operated by the driving motor. it realizes the loading, in that the damper has a negative drive force that puts on the motor. Based on the ordinary electromagnetic damper, the thesis presents a novel hybrid excitation electromagnetic damper which has adjustable work characteristic, analyses the working principle and structural feature of the electromagnetic damper, deduces the formulas to calculate the eddy current density through the Electromagnetic theory, analyses the distribution of the eddy current in the cotyloid rotor, and also studies the method of calculating the damp torque, establishes the mathematical model of the electromagnetic damper, analyses the relationship between the electromagnetic damper structural parameter and damp torque, researches the engineering design and analysis method of the electromagnetic damper, provides theory foundation for the design and analysis of the electromagnetic damper, contrives a hybrid excitation electromagnetic damper that satisfies the target request, designs a set of compound excitation electromagnetic damping loading control system whose control core is AT89C51 monolithic integrated circuit, analyses the electric circuit part, and carries on the experimental test to this set of electric circuits. Finally it debugs this electromagnetic damping loading system, this system satisfies the target request proposed.

论文提出了一个全新的加载测试系统种类，该加载系统是在阻尼器工作原理基础上，利用电动机拖动阻尼器运转，从而阻尼器产生一个与运动方向相反的阻尼力矩，该力矩作用在电动机上实现对电动机加载测试；同时，论文在一般电磁阻尼器基础上提出了一种新型的可调式复合励磁电磁阻尼器结构，该种阻尼器的工作特性在一定范围内可进行调节；论文分析了电磁阻尼器的工作原理和结构特点，运用电磁场理论分析推导了电磁阻尼器的涡电流密度公式，分析了涡电流在转子杯内的分布图，并对阻尼力矩计算方法进行了研究，建立了电磁阻尼器的数学模型，分析了电磁阻尼器结构参数和阻尼力矩之间的关系，对电磁阻尼器的设计和分析方法进行了研究，为电磁阻尼器的工程设计建立了理论基础；设计了满足技术指标要求的复合励磁电磁阻尼器和一套以AT89C51单片机为控制核心的复合励磁电磁阻尼加载控制系统，对该控制系统硬件电路各部分进行了分析和设计，对软件进行了设计，并对控制电路进行了试验调试，该系统满足所提出的加载指标要求。

This is due to the dry friction damping is merely limited to shroud interface and is a standard local nonlinear problem, when directly solving it, most operations will be used meaninglessly to regenerate its linear elements except for modifications of some elements of stiffiness matrix and damping matrix.

这是由于干摩擦阻尼只局限于凸肩接触面，是典型的局部非线性问题。直接迭代求解时，除了只需对系统刚度矩阵、阻尼矩阵的个别元素进行修正外，有相当一部分运算毫无意义地用于线性元素的重新生成上。

In this paper the nonstationary vibration behavior of an unbalanced rotor system, which is assumed to be bending flexible but torsionally rigid, during acceleration or deceleration through the critical speeds is investigated. Influencing factors such as gyrascopic effects, external and internal damping, Supporting mass, damping and stiffness, asymmetry of the shaft crass section as well as anisotropy of the supports are considered.

在理论分析方面，本文考虑了转子的陀螺效应，内外阻尼，轴截面的非对称性，支承的貭量、阻尼、刚度和支承的各向异性等因素的影响，使用分析动力学，建立起严格的运动方程，并考虑了弯曲自由度与转动自由度间的耦合，因而能较精确地分析和描述转子通过临界点时的非定常振动和转速变化規律。

Means resiliently connecting the blade subassemblies to each other and to the drive shaft for rotation with the shaft, said connecting means including viscoelastic means through which rotational movement of the shaft is transmitted to the blades, the viscoelastic means being loaded torsionally and stressed in shear to transmit said rotational movement while resiliently permitting and damping in-plane movements of the blade subassemblies relative to the drive shaft, the viscoelastic means also resiliently permitting and damping relative in-plane oscillations between the blade subassemblies.

手段弹性连接叶片组件向对方和向传动轴旋转与轴的说，连接方式，包括粘弹性透过何种途径旋转运动的轴转交给刀片，粘弹性的手段正在加载扭矩，并强调在剪，以转递说，旋转运动的同时，允许和弹性阻尼在平面变动的刀片组件相对到传动轴，粘弹性也意味着允许弹性和阻尼相对在平面振荡之间的叶片组件。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。