查询词典 damping-off

In this paper, the dynamic characteristics of a beam with viscous damping layers are studied. For convenience to analyze by transfer matrix method, the concept of equivalent dissipated energy is utilized to transform the damping layers to be uniformly soloed into the beam body without changing thesis damping effect.

中文摘要本文是以梁含有黏滞阻尼作动态特性研究，为了方便作分析，本文利用传递矩阵法作分析，再以消散能等效原理，将阻尼均匀融入在主梁其不改变阻尼效益。

Based on the simulation data, the effects of clearances, damping coefficient and the rotation speed on the dynamic behaviors are studied: compared with ideal mechanisms, mechanisms with clearances are less stable; as for mechanisms with clearances, when the crank rotates at the speed of 100rad/s, the actual clearances are always above the radium of clearances, axle pin and axle cover keep contact throught the rotation; when the crank rotates at the speed of 20rad/s, mechanisms are in an unstable state, at an angle of about 300, the actual clearances are below the radium of clearances, pairs lose contact, which results in collision between them; with the speed of 20rad/s, when damping coefficient is assumed 175Ns/m, distinct separation and collision happen between pairs; when damping coefficient is assumed 220Ns/m, separation and collision are controlled.

在含间隙机构中，当曲柄以100rad/s转动时，运动副间隙始终大於半径间隙，轴销与轴套始终保持连续接触；当曲柄以低速20rad/s转动时，系统处於极不稳定的震荡状态，在转至300°左右时，运动副间隙小於半径间隙，脱离接触，发生明显的分离碰撞现象。在含间隙机构中，曲柄以低速20rad/s转动，当取法向阻尼系数为175Ns/m时，副元素发生明显的分离碰撞现象；当取法向阻尼系数为220Ns/m时控制了副元素的分离，副元素一直处於连续接触状态。

This paper introduced the mechanism of vibration in the process of deep hole boring ,developed a dynamic modal of the damping boring bar,optimizing the parameters of the damping system,analyzed the transient dynamic and harmonic response of the damping boring bar.

介绍了深孔镗削加工过程中产生振颤的机理，建立了减振镗杆的动力学模型，在此基础上优化减振系统的参数，并且对减振镗杆进行瞬态动力学和谐响应分析，分析结果表明该减振系统具有良好的减振性能。

The results show that the damping capacity of Zn-22%Al remains constant for ageing temperature below 80℃, the warm rolling temperature. Traces of Ce and La can improve the damping capacity of water quenched and warm rolled Zn-22%Al, and decrease the reduction of the damping capacity of Zn-22%Al during ageing at 150℃.

结果表明，经水淬后80℃温轧的Zn-22%Al合金在低于温轧温度下时效时，其阻尼性能保持稳定；微量Ce，La的加入，提高了经水淬后80℃温轧的Zn-22%Al合金的阻尼性能，减缓了经150℃时效后阻尼性能的降低。

So, the proportion coefficient in the damping region is changed from constant to variable. Setting the damping region as the same thickness, the transition region is located in the damping region. In the transition region, the proportion coefficient increases and reaches a constant in the end.

为此，对Sarma吸收边界条件进行了改进，将衰减层内所采用的恒定比例系数改为变比例系数，即在衰减层厚度相等的条件下，在衰减层内设置一个过渡带，在过渡带比例系数由小变大，在衰减层内比例系数取恒定值。

In accordance with damping layer position, damping layer value, damping layer length for free vibration and forced vibration to discuss which restrain vibrate effetely.

分别针对阻尼层的位置、阻尼层长度、阻尼值的大小在自由振动与强迫振动探讨其抑制振动效果。

In order to study the effects of cold-rolling deformation on damping characteristics of TiNi alloys and the relationship between the damping characteristics and the microstructure, the damping characteristics of martensite for Ti_(50)Ni_(50) alloy have been investigated systematically by DSC, TEM, DMA and sound internal friction test.

为了探讨冷轧变形对TiNi合金阻尼特性的影响，及TiNi合金马氏体的阻尼特性与组织结构之间的关系，采用示差扫描量热分析、透射电镜分析、动态机械分析和音频阻尼测试方法，系统研究了冷轧变形后Ti50Ni50合金马氏体的阻尼特性。

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Secondly,some influence factors of damping adjustable multiple are analyzed to provide some ways for augmenting the damping adjustable multiple under the condition of keeping initial damping moment invariable.

Secondly ，一些影响因素的多重阻尼可调的分析提供一些途径增加阻尼可调多的条件下，维持最初的阻尼时刻invariable。

The damping composite structures with three-layered damping materials were prepared. The damping properties were studied with the finite element method.

随着现代科学技术的发展，人们对工作和生活环境的要求也越来越高，振动和噪声的控制日益成为一个复杂而迫切的问题。

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。