振动

Mathematical model and transfer function of electro-hydraulic control system of Friction Welding Machine are established.

建立了线性摩擦焊机电液伺服振动系统的数学模型和传递函数，采用Matlab/Simulink软件对其进行了动态仿真分析，特别是对谐振振动系统原理及效果进行了深入分析，以初步验证线性摩擦焊机电液伺服振动系统性能。

It is discussed that wire-electrode how to affect the machining process and machining quality. The amplitude is tested of guide pulley vibration at different wire-electrode travelling speed.

讨论电极丝振动对加工过程和加工质量的影响，测试不同丝速下导轮振动的振幅；从弦线理想方程出发，求出电极丝振动的理想数理方程的解。

Studies show that the AM method and the new analytical expression are reliable and economical physical methods for studying full vibrational energy spectra and molecular dissociation energies of diatomic electronic systems theoretically, which are particularly useful for those diatomic systems whose high-lying vibrational energies may not be available.

结果表明，AM方法和新建立的离解能解析式相结合的理论方法对研究双原子分子及离子的完全振动能谱和离解能是行之有效的、简单经济的物理方法，为实验技术难以精确测量其高激发振动能级或离解能的双原子分子或离子体系提供了获得精确的完全振动能谱和体系离解能的一种理论新方法。

This phenomenon is called interference of waves.

人们把频率相同、振动方向平行、相位相同或相位差恒定的两列波相遇时，使某些地方振动始终加强，而使另一些地方振动始终减弱的现象，叫做波的干涉现象，能够产生干涉现象的两列波叫做相干波，而它们的波源就叫做相干波源。

In the machine process creation of vibration all have is forced a vibration and from arouse vibration, and tool machine, tongs, knife and work piece the dynamic state characteristic of craft system for constitute relevant.

在机械加工中产生的振动都具有受迫振动和自激振动，与机床、夹具、刀具和工件组成的工艺系统的动态特性有关。

Abnormal vibrations of units and mill construction may cause the equipments in hydroplant inefficient, create fatigue in components of units, consequently, affect safe and stable operation of units, and the benefit of the hydroplant is also influenced.

机组和厂房结构的异常振动可使厂房内的仪器设备失效，机组部件疲劳或破坏，从而影响机组的安全稳定运行，致使电站不能长期合理发挥效益；同时，机组和厂房结构的异常振动及其附带产生的较大的噪声会使现场工作人员产生不适，长时间暴露在较强振动与噪声下，对厂房内工作人员的身心健康会产生不良影响。

They can be a support for thedesigner to look insight of the vibration mechanism of the mistuned bladed disk, andto predict its forced response. Therefore, the researches of this dissertation canprovide fundamental theories for studying and designing the power systems of thenew high performance aero-engines.

本文的研究结论，不仅在很大程度上完善和发展了研究失谐叶盘系统振动局部化问题的基础理论，也为设计人员正确理解失谐叶盘系统的振动机理及准确预测其振动响应提供了有效的方法和手段：并为进一步研制高性能的叶盘动力系统打下了理论基础。

Because the error mainly comes from theresonant region, the error correction method can only be used in resonant region, andcan effectively improve the efficiency of the statistical analyzing solutions. Two types of the mistuned bladed disks, whose friction damping are blade dryfriction damping and blade-to-blade dry friction damping, are modeled respectively. Amulti-harmonic method which can employ the fast Fourier transformationtechnique is proposed to investigate the vibratory response of the bladed disks withthese two types of nonlinear friction damping. Formulations of the solution for thesetwo types of motion functions are deduced. The characteristics of the forced responseof the bladed disks with these two dry friction damping are analyzed and summarizedunder various system parameters. The vibratory response of the bladed disk with dryfriction scatter mistuning is investigated.

针对叶盘系统中两类主要的非线性干摩擦阻尼形式，分别建立了具有叶片干摩擦阻尼和叶间干摩擦阻尼的失谐叶盘系统的非线性力学模型；提出了一种可利用快速傅立叶变换技术的多谐波分析方法；分别推导了具有这两类干摩擦阻尼形式的叶盘系统运动方程的求解公式；在各种系统参数条件下，研究了干摩擦阻尼失谐叶盘系统的受迫振动响应特性；对具有干摩擦散乱失谐的叶盘系统振动响应进行了研究，分析总结了干摩擦散乱失谐对叶盘系统振动响应特性的特殊影响规律。

The methods for wave motion analysis, which studies vibrational phenomenon and mechanism in space and wavenumber domains, is used quite fewer, It is seldom used in China.

长期以来，对工程振动问题，人们往往习惯从时域和频域去分析研究，即采用振动分析法，而用波动分析法，即从空间域和波数域去研究振动现象和机理则不太多，在国内则很少见。

Simultaneously founding the mechanical modelof the seeder and analyse engine's libration when it was running at 50r/s,42r/s,38r/s,25r/s,7r/s influence on arranging seeds and use damping spring and latex to reduce libration about this part. Analysed the treading and swerving capability of the Paddy direct-seeding machine. Research results indicate: only boat motherboard's front across baffle's angle is 30 degree, the section shape of motherboard is undee, depth of section is 30mm, direct seeding engine stepped resistance and soil is least, turning

研究结果表明：当船底板前横挡板角度为30度、底板截面形状为波浪形、底板截面深度为30mm时，直播机在行走时行走阻力最小，壅土最少，转弯时转弯阻力最小；当发动机38r／s时，发动机对排种盘的振动影响最大，加刚度为100N／mm的减振弹簧或厚度为35mm的橡胶后，排种盘的振动量会大大降低，减振后的振动对排种无重大影响；仿真结果还显示，排种器力学模型、直播机行走、转弯性能和排种性能合理。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。