小振动

The relation between the result accuracy and the element number of the system is studied and shows the minimal element number to ensure the response result accuracy is determined by the excitation frequency and the modal modes of the system.

研究指出，保证计算结果精确性的最小网格划分数目与激励频率及管道系统的振动模态有很大关系，即由对管系响应贡献较大的最高阶模态振型决定，这一研究成果对实际管道系统振动响应计算中时间与空间节点的划分提供了理论依据。

This paper aims to investigate structural health monitoring oriented finite element modeling for the tower of long-span bridges.

首先采用不同的方法分别建立了大跨桥梁索塔的精细有限元模型和简化模型，运用环境振动实测结果对简化有限元模型进行了修正，并和精细模型计算结果相比较；研究结果表明：严格按照设计图纸建立的精细有限元模型计算得到的动力特性与索塔现场环境振动实测值之间的误差较小，而未经修正的简化模型误差较大，由此说明：大跨桥梁在有限元建模时应尽可能详细地反映结构的几何与材料特性，在此前提下，对于设计资料全面的桥梁结构，建立有限元模型时就只需要修正那些无法用数学和物理方法模拟的不确定因素。

The kinetic energy of the collective motion have been parted three parts, which arevibrations in body-fixed frame, rotation of this system about the axes of Lab-frame and couplingbetween vibrations and rotation.

我们从多极形变系统小形变下的集体运动经典动能表达式出发，引入转动算符，把多极形变系统的集体运动动能从实验室系转到体坐标框架，从而将集体运动动能分解成体坐标框架下的形变振动、体坐标系围绕实验室系的转动及振动与转动的耦合。

The test results show that by substituting the spicule cast iron wedge with combination wedge, the vertical vibration of the car can be improved greatly, the vertical acceleration and ri

试验结果表明，通过换装组合式斜楔减小转向架系统的相对摩擦系数，可以明显改善车辆的垂向振动性能，使空、重车的垂向振动加速度及垂向运行平稳性指标降低，并且对车辆的横向力、脱轨系数及轮重减载率的影响较小。

Research shows turning round vibration is the main vibration shape of system of direct empty cold construction, should consider fan of; of vibration shape coupling many a little bit the structural vibration that syntonic drive causes is answered lesser, movement of fan low frequency is more than the influence of high frequency movement to the structure to structural influence.

探究表明扭转振动是直接空冷结构体系的主要振型，应该考虑振型耦合；风机多点谐振激励引起的结构振动响应较小，风机低频运转对结构的影响大于高频运转对结构的影响。

In order to detect load in tumbling box correctly,the frequency band that could reflect information of mill ball load was obtained from the vibration signal collected from ball mill bearing block.The signal was analyzed by energy method based on wavelet transform,from which the frequency band signal was picked out to show the corresponding coal level in tumbling box.

为了更准确地检测料位，对球磨机轴承座振动加速度信号进行采集，从振动信号中提取了反映料位信息的特征频段，利用小波分析技术对信号进行了能量分析，分离出反映滚筒内存煤量信息的信号，为实现球磨机料位的自动控制提供了理论依据。

Detailed content and main conclusion of this paper are listed below: In chapter 1, general Situation and existed conditions of vibration of water-power set and plant are introduced, the new method of signal analysis such as wavelet analysis, fractal geometry and the problem to be solved in this paper are summarized.

具体思路和研究内容如下：第一章绪论部分简要介绍了水电站机组振动及厂房结构振动的现状、存在的问题以及未来的发展动态，对本课题所要用到的小波、分形等现代信号处理方法及本课题所要解决的问题进行了归纳和说明。

This paper introduces and compares several blood pressure measurements, among which two noninvasive blood pressure measurements based on oscillometric and auscultatory method s are mainly compared.

使用振动法无创伤血压测量监护仪和柯氏音听诊法对样本人群进行了血压测量，分析所得数据，结果表明，基于振动法和柯氏音法无创血压测量仪测量值差异小，准确性也比较好。

AIM: From the views of biochemistry, histology and molecular biology, this study observed the effects of 4-6 Hz vibration on concentration of hexosamine, the expression of mucin 5AC mRNA in gastric mucosa and histomorphology, and investigated the effects of body vibration on rats' gastric mucus secretion and mucosal structure.

邓 艳，陈伟华，宋小丹，张源淑南京农业大学动物医学院，农业部生理生化重点开放实验室，江苏省南京市 210095目的：从生物化学、组织学和分子生物学角度观察4~6 Hz振动对大鼠胃黏膜氨基己糖含量、黏蛋白5AC mRNA表达及其组织形态学变化，探讨振动对大鼠胃黏膜黏液分泌及形态的影响。

A fault diagnosis mothed for hydro-generator units has been put forward according to their vibration frequency spectrum characteristics.

摘要针对水轮发电机组振动的频谱特点，提出了基于小波包分析的水轮发电机组振动的故障诊断方法。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。