Fundamental frequency analysis of a thermally loaded corroded exponentially graded rotor bearing system

Sathujoda, Prabhakar; Batchu, Aneesh; Obalareddy, Bharath

doi:10.1080/24705314.2021.1892574

Cited by 4 publications

(1 citation statement)

References 28 publications

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“…Some researchers have been exploring the FG rotor systems having imperfections such as corrosion and cracks. Natural and whirl frequency analysis has been performed on the power law-and exponential law-based FG rotor-bearing system with corrosion [24,25]. Gayen et al [26] carried out the whirl frequency analysis of an FG rotor system with a transverse crack.…”

Section: Introductionmentioning

confidence: 99%

A Study on Dynamic Behaviour of Thermally Distributed Exponentially Graded Rotor System with Induced Porosities

Vaka

Sathujoda

Bhalla

et al. 2022

Mathematical Problems in Engineering

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The present work deals with the dynamic analysis of exponential law-based functionally graded (FG) rotor-bearing systems. The effect of thermal gradation and porosity on dynamic characteristics of FG rotor shafts has been studied first time, using exponential law with a novel two-nodded FG rotor element based on Timoshenko beam theory (TBT). Porous material properties are assorted using exponential law and thermal gradation across the cross section of the FG shaft using exponential temperature distribution (ETD). The effects of temperature and porosity on natural frequencies and whirl frequencies are studied. It has been observed that there is a significant reduction in natural frequencies and whirl frequencies with an increase in volume fraction of porosity and temperature. Attempts have been made to obtain suitable reasons for the behaviours based on the material properties. Furthermore, the steady-state and transient vibration responses have been simulated using the Houbolt time marching technique for the ceramic-based FG rotor shaft system. The result shows the maximum amplitude of the steady-state and transient vibration responses is increased, and the critical speed of the FG rotor system shifts towards the left with the increase in volume fraction of porosity and temperature.

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Section: Introductionmentioning

confidence: 99%

A Study on Dynamic Behaviour of Thermally Distributed Exponentially Graded Rotor System with Induced Porosities

Vaka

Sathujoda

Bhalla

et al. 2022

Mathematical Problems in Engineering

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Steady-state and transient vibration analysis of a thermally loaded power law-based functionally graded rotor system with induced porosities

Vaka

Sathujoda

Bhalla

et al. 2022

Forces in Mechanics

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On the effectiveness of standards application to threshold setting in vibration condition monitoring in industrial machinery

Delprete,

Gastaldi

2024

Proceedings of the Institution of Mechanical Engineers, Part O:

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One of the goals of Industry 4.0 is to minimize unplanned maintenance emergencies and to leverage the efficiency of condition-based, just-in-time labor and repairs. Achieving the benefits of predictive maintenance via an Industry 4.0-style plant requires not only a data capture ecosystem, but also reference values to inform the monitoring system. Effectively estimating the values of monitoring thresholds is not an easy task, especially in those cases where the manufacturer does not provide data, or the machine is not new but the monitoring system has just been installed, therefore a measurement history is not yet available. The purpose of the present work is assess, through the analysis of two separate test cases, whether the monitoring thresholds suggested by different internationally recognized standards may serve as effective starting values in a vibration-based condition monitoring system. While general agreement on the order of magnitude of the thresholds is present in all cases, the differences between the standards allow for conclusions to be drawn on the most convenient format and processing technique to handle the data and to assess the most/least conservative standards. This paper constitutes, to the authors knowledge, the only systematic study in which the recommendations of all available international standards for vibration monitoring of non-rotating parts are applied to the same test cases and compared.

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Fundamental frequency analysis of a thermally loaded corroded exponentially graded rotor bearing system

Cited by 4 publications

References 28 publications

A Study on Dynamic Behaviour of Thermally Distributed Exponentially Graded Rotor System with Induced Porosities

A Study on Dynamic Behaviour of Thermally Distributed Exponentially Graded Rotor System with Induced Porosities

Steady-state and transient vibration analysis of a thermally loaded power law-based functionally graded rotor system with induced porosities

On the effectiveness of standards application to threshold setting in vibration condition monitoring in industrial machinery

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