查询词典 theorem for damping

The modal tests of PCB and PCB assembly (free boundary condition and fixed boundary condition) were carried out. The equivalent elastic modulus and damping parameters of PCB can be gained, and the fixed boundary condition of finite element model was also determined. These will help to the following work. Second, drop impact tests of three different heights were carried out. Strains and acceleration responses of PCB were measured. Failed BGA packages of different test conditions were dyeing, and cross section analysis of failed solder joints was conducted. It was found in our drop tests that the root cause of lead-free solder joints under drop impact was the combined effect of mechanical shock and PCB bending vibration.

针对JEDEC标准试件的局限性，提出了设计便于统计学研究焊点可靠性的试验试件的构想，利用有限元模态分析方法确定并验证了用圆形PCB组件替代JEDEC标准试件的可行性；通过一系列模态试验和有限元模态分析，确定了圆形PCB组件的相关试验参数，这不仅为跌落碰撞下PCB组件有限元模拟确定了较为合理准确的有限元模型，而且为正确地评价跌落碰撞下PCB组件的可靠性问题奠定了基础。

Damping Adjust - External rebound, low speed compression to 'Lock' with external Floodgate

阻尼调整-外部反弹，低速压缩'锁'与外部闸门

The forces and moment for the model advancing forward with forced heave and forced pitch oscillation, and the hydrodynamic mass and damping coefficients for heave and pitch motion of the model are given. The results of numerical simulation are compared with the experimental data from Delft University of Technology, and show good agreement with them.

文中给出了以不同航速前进的船舶强制垂荡和纵摇的力与力矩，以及船舶垂荡和纵摇的附加质量系数和阻尼系数，并与DUT的试验数据进行了比较，二者吻合良好。

At first, based on the results of the field tests and studies, this paper indicates that there are two kinds of low frequency power oscillations on the weak tie line: one is caused by negative damping, and belongs to the free oscillation; the other is caused by periodic load disturbances and periodic adjustments, and belongs to the forced oscillation.

首先，本文根据现场试验和研究结果指出，互联系统的弱联络线上存在两类性质不同的低频功率振荡：一类是由负阻尼引起的，属于自由振荡；另一类是由于系统周期性负荷扰动或振荡调节等引起的，属于强迫振荡。

Therefore, the study for material damping of RC and CFST under forced vibration is urgent in theory and practice of seismic design and dynamic analysis of structures.

因此，钢筋混凝土和钢管混凝土受迫振动条件下的材料阻尼研究对工程结构抗震设计与动力分析具有重要的理论与实际意义。

It is showed in plenty of research papers that under forced vibration, damping value is far more than that obtained in free vibration test and increases with the increase of stress or deformation.

大量的研究和测试资料表明，在强迫振动作用下，阻尼要比由自由振动测试所获得的数值大出很多，是随着应力或变形的增大而提高的。

Vibration into free vibration, vibration and forced vibration damping.

振动分为自由振动、阻尼振动和受迫振动。

By analyzing the forced vibration and damping characteristics of the system, a least logarithm decrement is proposed, which can be used as the capability criterion, when the critical speed is stridden over.

研究发现，不同的系统参数对系统的动力特性有不同的影响，同一参数对不同系统的动力特性的影响规律也是不同的；在该系统中，总有一个稳定性薄弱环节影响系统的稳定性。

Second, modal decoupling method for seismic response analysis of ED systems is developed. The computation results show that this method based on forcing decoupling the non-classical damping matrix of ED system has high accuracy. Combined with the aseismic design code being revised, an aseismic design process of ED structures is presented, and two design examples are given.

然后，提出了耗能减振结构地震反应分析的振型分解法，计算表明这种基于非正交阻尼矩阵强行解耦的方法有很高的精度；结合我国正在修订的建筑结构抗震设计规范，提出了滞变型耗能减振体系的抗震设计方法，并通过两个实例说明这种设计方法是可行的。

The working principle of the brake is generated by the friction brake to increase the output shaft damping, reducing the sensitivity of the rotation axis.

该刹车的工作原理是由摩擦产生制动，以增加输出轴阻尼，降低了旋转轴的灵敏度。

You can snipe the second and third union leaders from this position.

您可以鹬第二和第三工会领袖从这一立场出发。

Aiming at the currently shortage of XML streams quality detecting, this paper proposes a new forecasting method of XML streams quality by least squares support vector machines, which is used the method of XML keys' vector matrix as windows, and vector product wavelet transform to multilevel decompose and refactor the XML streams series, that can fulfill real-time checking demand of XML quality, and ensure constraint, consist- ency and integrality. For even more adapting net load, it proposes a control strategy by weight and adaptive adjustment to ensure XML streams quality.

针对当前XML数据流质量检测存在的不足，提出构建XML键的矢量矩阵作为窗口，利用矢量积小波变换多级分解与重构XML数据流，再结合最小二乘支持向量机对XML数据流质量进行预测的一种方法，满足XML数据流质量重构时实时检测的要求，保证XML数据的约束性、一致性与完整性；为了更好的适应网络负载，采取加权与自适应窗口调整等调度策略充分保证XML数据流的质量检测。