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振动基本
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     It is shown that the track component stiffness has severe influence on the vibration in the frequency range lower than 400Hz but very little influence on the vibration in the frequency range above 400Hz,and therefore little influence on wheel/rail rolling noise.
     结果表明:降低轨道刚度,可以有效降低轮轨系统400Hz以下频率的振动,但对40Hz以上的振动基本无影响,从而,对轮轨噪声也基本无影响。
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     Based on it, choice of basic parameters continuous casting mould has been discussed .
     在此基础上,讨论了锰系铁合金连续铸造结晶器振动基本参数的选择。
短句来源
     According to basic theory and the late research results on the unit vibration,it analyse some vibration problemson large units for power station near the college.
     根据振动基本理论和近年来对机组振动的研究成果,对邻近电厂大机组的一些振动问题进行分析。
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     Equations of large amplitude and thermoelastic coupled vibration for thin plates in polar coordinates are deduced,and equations of free vibration for a heated circular thin plate are presented.
     从笛卡尔坐标系下板的非线性热弹耦合振动基本方程,导出了极坐标下板的大变形非线性热弹耦合振动基本方程,进而得出了轴对称情况下圆板的非线性热弹耦合振动基本方程。
短句来源
     the fundamental equation of thermoelastically coupled nonlinear vibration is derived from the elasticity theory. The force and thermal boun- dary contions are analysed. As an example,the simply supported plate pro- blem is dealt with.
     从弹性力学理论出发,导出板的非线性热弹耦合振动基本方程以及力和温度场的边界条件,并就简支板情形作了具体分析和数值计算,得到热弹耦合效应对振幅和频率的作用机理。
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     The Vibration and wave motion are basic states of material motion.
     振动和波动是物质运动的基本形态。
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     Firstly, the basic principle of the vibro-acoustography is discussed.
     首先从理论上分析了振动声成像的基本原理;
短句来源
     VIBRATIONS OF A PIPE LINE
     输水管的振动
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     Vibratory Stress Relief
     振动时效
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     basic principles;
     基本原理 ;
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  vibration fundamental
The intensity of the quadrupole acoustic radiation generated by the vibration fundamental mode in the first order of smallness in amplitude turns out to be much weaker.
      


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本文研究了作用在透水护坦上的平均动水荷载及脉动荷载.研究指出,在护坦范围内设置排水孔(Π_д/Π_п=5~8%),不仅能消除压力差,而且会导致护坦上脉动荷载的降低.试验表明,透水护坦上脉动荷载的数值及其分布特性不妨碍将护坦进行分块.文中也研究了脉动压力向护坦底面传递的规律.研究表明,在考虑水的附加质量及压力差的影响后,护坦板自由振动的基本频率降低约50%.文中最后给出了设计透水护坦的一些建议.

In this paper, the basic principles and main features of a universal computer programme using finite element method of subspace iteration to calculate structural elements of a machine tool are introduced. During the calculation, the structural elements are regarded as a box-type structure made up of thin flat plates. For checking the computed accuracy obtained from this programme, the resonance frequencies and modes of a cantilever beam divided into meshes with different fineness are calculated and compared...

In this paper, the basic principles and main features of a universal computer programme using finite element method of subspace iteration to calculate structural elements of a machine tool are introduced. During the calculation, the structural elements are regarded as a box-type structure made up of thin flat plates. For checking the computed accuracy obtained from this programme, the resonance frequencies and modes of a cantilever beam divided into meshes with different fineness are calculated and compared with the accurate solution obtained from analytical approach. The computed results about the resonance frequencies, modes and forced vibration regardless of damping in a cross-beam of numerical control planomilling machine are also introduced.

本文介绍了用子空间迭代的有限元法计算机床大件(也称结构件)振动的基本原理和所编制的通用计算程序的主要特点。计算时将机床大件按空间平板组合结构来处理。为了检验所用程序的计算精度,对不同粗细网格的悬臂梁进行了自振频率和振型的计算,并和用解析法计算所得的精确解作了对比。本文并介绍了对数控龙门铣床的横梁进行自振频率、振型和不计阻尼时的强迫振动计算的结果。

This study deals with a complete analytical mode-shape analysis of thelateral oscillation for a two-axle-bogie locomotive. The principal purpose of thispaper is to give a clear physical interpretation of each basic mode-shape of la-teral vibration, its characteristic of instability and the influences of parame-ters on the critical speeds corresponding to each basic mode-shape. A mathema-tical model of 17 degrees of freedom is used and the differential equations ofmotion were solved numerieally by QR double-step...

This study deals with a complete analytical mode-shape analysis of thelateral oscillation for a two-axle-bogie locomotive. The principal purpose of thispaper is to give a clear physical interpretation of each basic mode-shape of la-teral vibration, its characteristic of instability and the influences of parame-ters on the critical speeds corresponding to each basic mode-shape. A mathema-tical model of 17 degrees of freedom is used and the differential equations ofmotion were solved numerieally by QR double-step method. A computer programwas carried out with a sub-routine to normalize the eigenvectors, The numericalresults were analyzed by the method of "Mode-Shape Analysis". One of the con-elusions is that the fundamental mode shape of lateral oscillation for a two-axle-bogie locomotive may be summarized into 8 modes, among which only 5 maybe instable. Furthermore, the instability of the other 5 instable modes may bedivided as restorable and irrestorable ones. As the parametric study being diff-erent from the similar studies published before, The proper task is to study theinfluences of parameters on the instability of 5 instable fundamental mode-sha-pes separately, The influences of 21 parameters are given. Based on this analysis,The instructions for optimizing each parameter to care the instability of the 5instable modes are also given respectively These obtained informations are offeredin a form which are most convenientto be used in practice.

本文涉及了两轴转向架机车横向振动振型分析的完整解析。主要目的是为了对横向振动的各个基本振型、它的不稳定特征以及参数对各基本振型临界速度的影响给以较清晰的物理描述。利用了一个17个自由度的数学模型。并用二步QR算法对微分运动方程作了数值的求解。编制了一个带有规格化特征向量子程序的计算程序。我们利用振型分析法对数值结果作了分析。结论之一是,对于两轴转向架机车其横向振动的基本振型可以归纳为8个振型,这8个中只有5个是不稳定的。此外,这5个不稳定振型的不稳定性又可以分为可恢复型和不可恢复型两种。我们为参数研究所规定的任务不同于以前已发表过的类似研究,是要熟悉参数对5种不稳定基本振型的影响。本文给出了21个参数的影响,同时在分析的基础上,也给出了各个参数最优化的说明,以便分别照顾到5种不稳定性振型的不稳定性。全部资料是以在实际中可以应用的形式提出的。

 
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