scholarly journals Vibration Analysis of Functionally Graded Rotating Shaft System

2016 ◽  
Vol 144 ◽  
pp. 775-780 ◽  
Author(s):  
D. Koteswara Rao ◽  
Tarapada Roy
Keyword(s):  
Vibration Analysis ◽  
Functionally Graded ◽  
Rotating Shaft ◽  
Shaft System

On the Vibration of a Rotor-Shaft System With Viscoelastically Supported Bearings

2003 ◽  
Author(s):  
N. Shabaneh
Keyword(s):  
Nonlinear System ◽  
Linear System ◽  
Vibration Analysis ◽  
Perturbation Expansion ◽  
Free Vibration Analysis ◽  
Rotating Shaft ◽  
Rotor Shaft ◽  
Model Free ◽  
Shaft System ◽  
Nonlinear Elastic

This paper investigates the dynamic behaviour of a single rotor-shaft system with nonlinear elastic bearings at the ends mounted on viscoelastic suspensions. A Timoshenko shaft model is utilized to incororate the flexibility of the shaft; the rotor is considered to be rigig and located at the mid-span of the shaft. A nonlinear bearing pedestal model is assumed which has a cubic nonlinear spring and linear damping characteristics. The viscoelastic supports of the bearings are modeled as Kelvin-Voigt model. Free vibration analysis is performed on the linear system including the damping of the bearings. Forced vibration analysis is performed on the nonlinear system. Equations of motion are derived for the nonlinear system based on the direct multiple scale method of one-to-one frequency-to-amplitude relationship using third order perturbation expansion. The effects of stiffness and loss coefficients of the viscoelastic supports on the complex natural frequencies are identified for the linear system. The results show that optimum values of the viscoelastic stiffness and loss coefficient can be achieved for a specific rotating shaft system to reduce vibrations and increase the operating regions. In addition, the frequency response of the nonlinear system indicates that a jump phenomenon takes place for high values of the bearing nonlinear elastic coefficient.

Torsional Vibration of a Damped Shaft System Using the Analytical-and-Numerical-Combined Method

2001 ◽  
Vol 38 (04) ◽  
pp. 250-260
Author(s):  
Jong-Shyong Wu ◽  
Mang Hsieh
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Torsional Vibration ◽  
Forced Vibration ◽  
Vibration Analysis ◽  
Equations Of Motion ◽  
Combined Method ◽  
Rotating Shaft ◽  
Shaft System ◽  
Element Method

Torsional vibration analysis of the propulsive shaft system of a marine engine—one of the most important tasks in preliminary ship design—is carried out today by either the Holzer method, the transfer matrix method (TMM), or the finite-element method (FEM). Of the three methods, Holzer is the most popular and is adopted by shipyards worldwide. The purpose of this paper is to present an analytical-and-numerical-combined method (ANCM) to improve the drawbacks of existing methods. In comparison with the Holzer method (or TMM), the presented ANCM has the following merits: the mass of the rotating shaft is inherently considered, the damping effect is easily tackled, and the forced vibration responses due to various external excitations are obtained with no difficulty. Since the order of the overall property matrices for the equations of motion derived from the ANCM is usually lower than that derived from the conventional finite-element method (FEM), the CPU time required by the former is usually less than that required by the latter, particularly in the forced vibration analysis. Besides, the sizes (and the total number) of the elements for the FEM have a close relationship with the locations of the disks and the dampers and so does the accuracy of the FEM, but various distributions (or locations) of the disks and the dampers will not create any problems for the ANCM.

scholarly journals Vibration analysis of functionally graded tapered rotor shaft system

2019 ◽  
Vol 23 (1) ◽  
pp. 241-245
Author(s):  
Abdelhak Elhannani ◽  
Kaddour Refassi ◽  
Abbes Elmeiche ◽  
Mohamed Bouamama
Keyword(s):  
Vibration Analysis ◽  
Equations Of Motion ◽  
Beam Theory ◽  
Functionally Graded ◽  
Taper Angle ◽  
Hollow Shaft ◽  
Exponential Law ◽  
Shaft System ◽  
Graded Material ◽  
Extreme Materials

Abstract This investigation deals with the vibration analysis of a rotating tapered shaft in Functionally Graded Material (FGM). The dynamic system is modeled using the Timoshenko beam theory (FSDBT) with consideration of gyroscopic effect and rotary inertia. The equations of motion are expressed by the hierarchical finite element method based on bi-articulated boundary conditions. The material properties are continuously varied in the thickness direction of a hollow shaft according to the exponential law function (E-FGM). The presented model is validated by comparing the numerical results found with the available literature. Various analyses are carried out to determine the influence of taper angle and material distribution of the two extreme materials on the dynamic behavior of FGM conical rotors system.

Comparison of vibration analysis with different modeling method of a rotating shaft system

2010 ◽  
pp. 589-595
Author(s):  
Dong Sik Gu ◽  
Byeong Su Kim ◽  
Jang Ik Lim ◽  
Yong Chae Bae ◽  
Wook Ryun Lee ◽  
...  
Keyword(s):  
Vibration Analysis ◽  
Modeling Method ◽  
Rotating Shaft ◽  
Shaft System
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