Advances in Vibration Engineering

Chong-Won Lee

Kye-Si Kwon

Si-Kyoung Kim

Modal Testing of Rotors with Rotating Machinery

旋转机械转子的模态测试

Linear dynamic systems must generally be expected to exhibit non-proportional damping. Nonproportionally damped linear systems do not possess classical normal modes but possess complex modes. In this paper we analyze the complex modes and complex natural frequencies arising in multiple degreeof-freedom non-proportionally damped discrete linear stochastic systems. Second-order statistics of the complex eigenvalues and eigenvectors are presented by assuming the randomness of the system to be so small that the first-order perturbation approach is valid. The proposed method is illustrated by considering numerical example based on a linear array of damped spring-mass oscillators. It is shown that the approach can predict the statistics of complex eigenvalues and eigenvectors with good accuracy when compared with independent Monte Carlo simulations.

S Adhikari

Complex modes in stochastic systems

随机系统中的复杂模态

Jyoti Sinha

Ar Rao

Simple Modelling of a Rotor with Cracks

简单裂纹转子建模

Christos Yiakopoulos

Konstantinos Gryllias

Ioannis Antoniadis

Spectral effects of the slip motion in defective rolling element bearings

缺陷滚动轴承中滑移运动的频谱效应

An exact frequency relationship exists between Kirchhoff and Mindlin plates of polygonal planform and simply supported edges. In this paper, we show that the use of this relationship leads to missing vibration modes due to the lack of consideration for the transverse shear modes and coupled bending-shear modes in the relationship. The missing modes appear at relatively high order modes and they were originally discovered by using discrete singular convolution (DSC) method that is capable of accurately predicting thousands of vibration modes without suffering from numerical instability as other methods do. An efficient state-space technique is used to confirm our findings. Using the state-space technique, exact vibration frequencies for transverse shear vibration modes of thick plates can be obtained. Numerical examples are presented to support our claims. These exact shear frequencies complement the bending frequencies predicted by using the Kirchhoff–Mindlin relationship. It is interesting to note that there are some coupled bending-shear modes that can be picked up by the DSC method which provides a complete spectrum of frequencies, even for very high frequencies.

C. W. Lim

Z. R. Li

Y. Xiang

G. W. Wei

Chien Ming Wang

On the missing modes when using the exact frequency relationship between Kirchhoff and Mindlin plates

关于使用基尔霍夫与明德林板之间精确频率关系时的缺失模态

Publication Information	Publisher: Krishtel eMaging Solutions，Publishing cycle: Quarterly，Journal Type: journal，Open Access Journals: No
Basic data	Year of publication: 2007，Proportion of original research papers: 0.00%，Self Citation Rate:N.A.， Gold OA Rate: 0.00%
Average review cycle	网友分享经验：>12周，或约稿
Average recruitment ratio	网友分享经验：容易

Advances in Vibration Engineering

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Modal Testing of Rotors with Rotating Machinery

Complex modes in stochastic systems

Simple Modelling of a Rotor with Cracks

Spectral effects of the slip motion in defective rolling element bearings

On the missing modes when using the exact frequency relationship between Kirchhoff and Mindlin plates

Control for tip trajectory tracking of a planar flexible link manipulator

Control for tip trajectory tracking of a planar flexible link manipulator

Control for tip trajectory tracking of a planar flexible link manipulator

Control for tip trajectory tracking of a planar flexible link manipulator

Control for tip trajectory tracking of a planar flexible link manipulator