Whirl frequencies and critical speeds of a rotor-bearing system with a cracked functionally graded shaft – Finite element analysis

Gayen, Debabrata; Chakraborty, Debabrata; Tiwari, Rajiv

doi:10.1016/j.euromechsol.2016.09.003

Cited by 50 publications

(31 citation statements)

References 19 publications

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“…Thus, the code is adopted for further works in different FG shaft systems discussed in current work. The points in the plots show the value plotted which lies exactly above the curves obtained from [7,10].…”

Section: Code Validationsupporting

confidence: 52%

“…1. Material properties are validated by the works of Gayen et al [7]. After validation, the code is extended to different a FG material composed of Al 2 O 3 and SUS304 for 80 mm diameter shaft at room temperature.…”

Section: Code Validationmentioning

confidence: 99%

“…Reddy and Chin [6], studied the dynamic thermoelastic response of functionally graded cylinders and plates using finite element modeling and considering the effect of thermomechanical coupling in the formulation. Gayen and Roy [7] work deal with the study of vibration and stability analysis of a functionally graded spinning shaft system using beam elements based on the Timoshenko beam theory.…”

Section: Introductionmentioning

confidence: 99%

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Natural frequency analysis of a functionally graded rotor system using three-dimensional finite element method

Bose¹,

Sathujoda²

2019

Vib. proced.

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Three-dimensional Finite Element (FE) analysis has been carried out using ANSYS software to study the natural frequencies of functionally graded (FG) rotor system. Temperature and position-dependent material properties of the FG shaft system are considered to be graded in the radial direction. Power-law with the nonlinear temperature distribution (NLTD) and exponential law with exponential temperature distribution (ETD) have been used to model the material gradation and temperature distribution. Rotor systems of two different FG materials, namely Stainless Steel-ZrO2 and Stainless Steel-Al2O3 have been studied. Python codes have been developed to generate ANSYS macros that apply the material properties. Simply supported FG shaft and FG rotor system supported on bearings have been analyzed in the current work. The results show the influence of different power-law coefficients, different material and material laws on the natural frequencies of the rotor system. The effect of these parameters on whirl frequencies has also been studied for FG rotor systems.

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Section: Code Validationsupporting

confidence: 52%

Section: Code Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Natural frequency analysis of a functionally graded rotor system using three-dimensional finite element method

Bose¹,

Sathujoda²

2019

Vib. proced.

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“…Genta [14] introduced the dynamics theory of multidegree-of-freedom rotating systems and continuous systems. Gayen et al [15][16][17] presented the finite element (FE) formulation of a functionally graded (FG) shaft having multiple cracks to study the transverse vibration of such shafts in a rotor-bearing system. Timoshenko beam was used where effects of translational and rotary inertia, transverse shear deformations, and gyroscopic moments were considered.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on the Vibration of Ship Propulsion Shaft under Hull Deformation Excitations on Bearings

Zhang

Xie

Huang

et al. 2019

Shock and Vibration

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With the development of ship enlargement, the problems of coupling vibration between hull and propulsion system and vibration transmission via bearings are more and more prominent. Based on the theory of shaft vibration and the experimental system for dynamic characteristics of the shaft, an experiment plan about propulsion shaft vibration under dynamic excitations is designed in this paper. e performance of propulsion shaft vibration under hull deformation excitations applied on intermediate and stern bearings is studied. Hydraulic excitations in horizontal and vertical directions on the intermediate bearing and stern bearing of the experimental model of propulsion shaft are considered in this paper to simulate hull deformation on bearings of the ship. Vibration characteristics of the shaft under different excitations are gained and coupling effects are discussed. Moreover, the influences of amplitude and direction of excitations on bearings and the shaft rotation speed on the vibration of propulsion are studied. e results show that aiming at improving the safety and reliability of navigation, the hull deformation, especially the horizontal hull deformation excitation on the intermediate bearing, is not neglectable and should be considered during primary design. Also, rotation speed and resonant frequency are needed to be well designed with the frequencies of hull deformation excitations.

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“…Ghanbari Mardasi et al carried out crack detection using wavelet packet transform and experimentally [19]. A. P.…”

Section: Introductionmentioning

confidence: 99%

Crack Depth and Crack Location Identification using Artificial Neural Network

Kekan¹,

Tjprc²

2019

IJMPERD

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Identification of crack depth and crack location is an area of concern for researchers across the globe. In the present paper, artificial neural network used to identify crack depth and crack location. Finite element model of rotary shaft with two bearing support was generated. A single crack of varying depth (2mm, 4mm and 6mm) was provided to finite element model of a shaft. Crack distance from bearing support was altered (100 mm, 200 mm, 300 mm and 400 mm). Natural frequency of rotor shaftwas obtained using the modal analysis method. Critical speed of shaft models was obtained from Campbell diagram. Thus, natural frequency and critical speed for all variations of cracks depth and crack locations were obtained. Critical speed and natural frequency for known crack location and crack depth wereused to train an artificial neural network. The training of artificial neural network was completed, with the help of artificial neural network crack location, and crack depth was identified accurately.

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Whirl frequencies and critical speeds of a rotor-bearing system with a cracked functionally graded shaft – Finite element analysis

Cited by 50 publications

References 19 publications

Natural frequency analysis of a functionally graded rotor system using three-dimensional finite element method

Natural frequency analysis of a functionally graded rotor system using three-dimensional finite element method

Experimental Research on the Vibration of Ship Propulsion Shaft under Hull Deformation Excitations on Bearings

Crack Depth and Crack Location Identification using Artificial Neural Network

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