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频率固有频率
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     Simple Analysis for Natural Frequencies
     关于固有频率的浅析
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     Computer Simulation of Roller Shearer Inherent Frequency
     滚筒采煤机固有频率的计算机仿真
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The purpose of this article is to clarify the various characteristic frequencies of a linear single degree of freedom mass spring system with viaoous damping. The frequencies are: undamped frequency ω0 ( resonant frequency, phase resonant frequency, velocity amplitude resonant frequency ) , natural frequency ωn, ( displacement ) amplitude resonant frequency Ωad and acceleration amplitude resonant frequency Ωaa.When the viscous damping is small, the differences among those frequencies are of no importance , and...

The purpose of this article is to clarify the various characteristic frequencies of a linear single degree of freedom mass spring system with viaoous damping. The frequencies are: undamped frequency ω0 ( resonant frequency, phase resonant frequency, velocity amplitude resonant frequency ) , natural frequency ωn, ( displacement ) amplitude resonant frequency Ωad and acceleration amplitude resonant frequency Ωaa.When the viscous damping is small, the differences among those frequencies are of no importance , and hence they are loosely termed as natural or somtmes undamped frequency. But if damping is not small, or analyzing dampnig coefficient, aerodynamic derivatives etc, through determining frequencies, then a clear distinction among those frequencies is of practical importance.

本文目的在于辨明单自由度粘性阻尼线性系统的各种特性频率:固有频率w_0(共振频率,相位共振频率,速度振幅共振频率),自然频率w_n,(位移)振幅共损频率Ω_(ad),和加速度振幅共振频率Ω_(aa)。Ω_(ad)

From the Kollmann-Wolf's experiments we know that a rotorpartially filled with an inviscid,incompressible fluid may undergo a self-ex-cited unstable vibration above the critical speed.In this paper,the vibra-tional characteristics of the rotor outside the unstableregion is studied.Thenumerical results obtained by the asymptotic theory show that asynchronousvibration may also occur above the unstable region.The intensity of asyn-chronous vibration,which is greater than that of synchronous vibration,in-creases...

From the Kollmann-Wolf's experiments we know that a rotorpartially filled with an inviscid,incompressible fluid may undergo a self-ex-cited unstable vibration above the critical speed.In this paper,the vibra-tional characteristics of the rotor outside the unstableregion is studied.Thenumerical results obtained by the asymptotic theory show that asynchronousvibration may also occur above the unstable region.The intensity of asyn-chronous vibration,which is greater than that of synchronous vibration,in-creases when the rotating speed goes up.The whirl frequency is a kind ofnatural frequency which is smaller than the rotating frequency.But the ratiois basically constant.The above conclusions were verified in the test andagreed extremely well with the experimental results.

由Kollmann-Wolf的试验知道,部分充有无粘不可压缩液体的转子系统,在其临界转速之上存在一个自激失稳区.本文进一步研究了系统在其自激失稳区以外的振动特性.渐近法的计算结果表明:在自激失稳区之上,系统的振动以异步振动为主,其强度随着转速的增大而增大,其频率是小于旋转频率的固有频率中的一个,且异步振频与旋频之比跟旋频无关.以上结论在实验中得到了证实,计算结果与实验值之间具有极好的一致性.

Method of anti vibration reliability design of rotating shaft is presented.It is based on conventional rotating shaft vibration design,but excitation frequencies,natural frequencies and vibration responses of rotating shaft are also considered as random variable.Reliability for the rotating shaft is determined by means of probabilistic mechanical design.The mathematic models of anti vibration reliability of rotating shaft are given.Furthermore,we made the design in Visual Basic language,so it was visible.A...

Method of anti vibration reliability design of rotating shaft is presented.It is based on conventional rotating shaft vibration design,but excitation frequencies,natural frequencies and vibration responses of rotating shaft are also considered as random variable.Reliability for the rotating shaft is determined by means of probabilistic mechanical design.The mathematic models of anti vibration reliability of rotating shaft are given.Furthermore,we made the design in Visual Basic language,so it was visible.A practical example is calculated using the software.It provides facilities for the engineering design.

提出了转轴的抗共振可靠性设计方法———以传统的转轴振动设计为基础,将转子的激振力频率、固有频率及振动响应等处理为随机变量,借助机械概率设计法来确定转轴的抗共振可靠度,给出了转轴抗共振可靠度计算的数学模型,并开发出可视化软件包进行了实例计算,从而可为工程设计提供便利

 
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