振动

Unmarried people would attempt to take a bite out of an apple bobbing in a pail of water, or suspended on a string.

未婚的人会试图以振动苹果咬出了桶水，在一系列或缓刑。

He says he feels the vibrations in his abdomen, but not his hands.

他说他的腰部感觉到了振动而不是手

So how to decrease the abrasion of bearings becomes one of the important researching subjects.

因此，如何减少轴承磨损是振动机构研究的主要课题之一。

Then the relationship between the vibration frequency of the plate in water and that in vacuo and the effect of nondimensionalized added virtual mass incremental are obtained by utilizing Rayleigh method.

进而应用瑞利方法得到了方板水中振动频率与真空中振动频率、无量纲附加虚质量增量之间的关系。

Then the relationship between the vibration frequency of the plate in water and that in vacuo and the effect of nondimensionalized added virtual mass incremental are obtained by utilizing Rayleigh method.

引 言机械结构在水中振动要涉及到具有挑战性的流-固耦合问题[1，2 ] ，通常求解的方法是对结构用有限元方法写出振动方程，对流体用边界元方法写出控制方程，再利用边界条件及辐射条件将两者联系起来求解。

So it is very important to analyze the propagation characteristics of vibration and energy in disordered periodic structures, which can provide theoretical bases for the vibration control and vibration reduction of substructures.

因此分析失谐周期结构中振动和能量的传播方式与规律具有重要的理论与实际意义，可以为重要子结构的振动控制和减振设计提供理论依据。

This paper based on passive vibrating isolation system which is supported by air-spring, presents a system using the horizontal active damper to makeup the fault of traditional isolation platforms, which includes three parts, data acquisition and data processing unit, computer control unit and electromagnetic damper unit.

本文基于以空气弹簧作为弹性支承的被动隔振台座，提出一套包括数据采集处理系统、计算机控制系统以及电磁作动系统三大部分的主动控制概念，以满足即使在振动量级极其微小的情况下，也能实时产生足够的阻尼力，提高微振动控制水平。

This has been more common among people who tend to lead the way vibrationally as they often live closer to the edge vibrationally than do most people.

对於那些较一般人倾向於带领振动之方向而他们经常生活在靠近振动力的边缘之人这已经是一个相当普遍的情况。

A hydraulic resistance instrument composed by two pressure transducers was used to measure the hydraulic resistance across the two kinds of channels. The impedance on both channels was measured by a four electrodes impedance instrument with 5kHz constant current. A vibration generator was put on one set of the channel to produce about 50Hz sound waves. The signal was detected by a crystal pickup on the other set of the channel to examine the transmission of the wave along the two kinds of channels.

使用双压力传感器流阻仪对两种通道的流阻进行测定；使用5kHz恒流四电极方法对两种通道的阻抗进行测量；使用激振器在通道的一端产生一个约50Hz的振动，在通道另一端用晶体拾音器检测振动信号，对两种通道的声音传导特性进行了测定。

At the same time, pattern recognition has been used for abstracting characteristics、predicting the life and evaluating the properties of engine. This research contributes toward global diagnosis for the diesel engine in eight ways.(1) Put forward"the Arithmetic of distinguish the period automatically using auto-correlation method";(2) Separate the waves of continuous knocks using WV distribution;(3) Propose"the logarithmic spectrum approximate method"to analysis the response of the knock between the steel and steel;(4) Discuss the relationship between the time-frequency distribution and timescale distribution in detail, and give the principle of classification;(5) Use the wavelet method to analysis the pressure signal of exhaust、suction;(6) Use the shape of vibration signal to analyse the working situation of cylinder;(7) Use the pattern recognition to select the good samples and abstract the effective characteristics;(8) Develop the model of total properties evaluation and life prediction.

本文在广泛的、深入研究的基础上，应用多种信号处理手段来分析处理数据，同时利用模式识别方法对故障的特征提取、寿命预测以及性能评价作了探讨，本文进行了以下几项工作：（1）提出了基于自相关自动周期识别算法的柴油机振动信号预处理策略；（2）提出了基于WVD分布的连续撞击响应信号的分离策略；（3）提出了基于对数谱拟合方法的钢—钢撞击响应求解模型；（4）提出了基于波形分析的非正常燃烧振动信号的诊断模型；（5）提出了基于小波细节信息的进气压力信号和曲轴箱压力信号的诊断模型；（6）提出了基于小波近似的喷油正时信号中燃烧位置的自动定位；（7）提出了基于统计模式识别方法的故障诊断知识的自学习与自组织策略；（8）提出了基于特征压缩思想的柴油机总体性能评价及寿命预测模型。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷