Authors : Shivprashant Jatav; Balendra Dhakar; Sumit Kumar Rai; Ruchika Saini

Volume/Issue : Volume 11 - 2026, Issue 8 - August

Google Scholar : https://tinyurl.com/y4k95zp3

Scribd : https://tinyurl.com/yfay9yvd

DOI : https://doi.org/10.38124/ijisrt/26aug219

Note : A published paper may take 4-5 working days from the publication date to appear in PlumX Metrics, Semantic Scholar, and ResearchGate.

Abstract : Rotordynamics deals with the vibration and dynamic behavior of rotating structures and plays a crucial role in the design of high-speed rotating machinery such as turbines, compressors, pumps, and electric motors. Accurate prediction of rotor dynamic characteristics during the design stage is essential to avoid excessive vibration, resonance, and catastrophic failures. The Finite Element Method (FEM) has become one of the most reliable techniques for analyzing rotor-bearing systems. Traditionally, rotor dynamic analyses have been performed using specialized commercial software; however, the continuous advancement of general-purpose finite element software such as ANSYS Workbench has provided an efficient and user-friendly platform for such analyses. This study investigates the applicability of line body (beam) elements in ANSYS Workbench for the dynamic analysis of a rotor system. Unlike three-dimensional solid elements, line body elements significantly reduce computational effort while maintaining satisfactory accuracy for slender rotor shafts. A finite element model of the rotor system is developed using line body elements, and its dynamic characteristics are evaluated through modal, harmonic, and transient analyses. The numerical results are validated with experimental measurements to assess the accuracy and reliability of the proposed modeling approach. The study demonstrates that line body elements in ANSYS Workbench provide an efficient and computationally economical alternative for rotor dynamic analysis without compromising the accuracy of the predicted dynamic response.

Keywords : Rotordynamics, Line Body Elements, Finite Element Method, Modal Analysis, Harmonic Response, Transient Analysis, Rotor System.

References :

1. Genin, J. and Murphy, J.S.M. (1971). The role of material damping in the stability of rotating systems. Journal of Sound and Vibration, 18(4), 515–529.
2. Muszynska, A. (1995). Forward and backward precession of a vertical anisotropically supported rotor. Journal of Sound and Vibration, 180(3), 473–501.
3. Burgess, A. (1988). Transient Response of Mechanical Structures Using Modal Analysis Techniques. Ph.D. Thesis, Department of Mechanical Engineering, University of London, London, UK.
4. Lalanne, M. and Ferraris, G. (1998). Rotordynamics Prediction in Engineering. Chichester: John Wiley & Sons.
5. Vatta, F. and Vigliani, A. (2007). Internal damping in rotating shafts. Mechanism and Machine Theory, 42(10), 1376–1384.
6. Das, A.S. and Dutt, J.K. (2008). Reduced model of a rotor–shaft system using modified SEREP. Mechanics Research Communications, 35(6), 398–407.
7. Alsalaet, J. (2000). Rotor Dynamics. Basrah: College of Engineering, University of Basrah.
8. Andrés, L.S. (2006). Introduction to Pump Rotordynamics. RTO-EN-AVT-143 Educational Notes, ANSYS Inc.
9. Nelson, F.C. (2007). Rotor dynamics without equations. International Journal of COMADEM, 10(3), 12–20.
10. Samuelsson, J. (2009). Rotor Dynamic Analysis of 3D-Modeled Gas Turbine Rotor in ANSYS. Master's Thesis, Department of Management and Engineering, Linköping University, Sweden.
11. Nassis, A. (2010). Analyses of a Rotor Dynamic Test Rig. Master's Thesis, Department of Mechanical Engineering, Luleå University of Technology, Sweden.
12. Chouksey, M., Dutt, J.K. and Modak, S.V. (2012). Modal analysis of rotor–shaft systems under the influence of rotor–shaft material damping and fluid-film forces. Mechanism and Machine Theory, 48, 81–93.
13. Chouksey, M., Dutt, J.K. and Modak, S.V. (2013). Model updating of rotors supported on ball bearings and its application in response prediction and balancing. Measurement, 46(10), 4261–4273.
14. Wagner, N. and Hübner, R. (2013). Dynamics of rotors in complex structures. In: Proceedings of the NAFEMS World Congress, Salzburg, Austria.
15. Fegade, R. and Patil, V. (2013). Unbalanced response and design optimization of rotor by ANSYS and design of experiments. International Journal of Scientific & Engineering Research, 4(7), 1–8.
16. Chouksey, M., Dutt, J.K. and Modak, S.V. (2014). Model updating of rotors supported on journal bearings. Mechanism and Machine Theory, 71, 52–63.
17. Saxena, A., Parey, A. and Chouksey, M. (2016). Study of modal characteristics of a geared rotor system. Procedia Technology, 23, 225–231.
18. Kang, Y., Qiu, Z., Zhang, H., Shi, Z. and Gu, F. (2021). Model updating for rotor–discs system and its application in dynamic coefficients identification of journal bearings. Measurement, 173, 108645.
19. Choe, T., Ri, K., Yun, C., Kim, K. and Kim, K. (2022). Nonlinear vibration analysis and stability analysis of rotor systems with multiple localized nonlinearities. AIP Advances, 12(12), 125004.
20. Afane, N.E.B., Zahaf, S., Dahmane, M., Belaziz, A. and Noureddine, R. (2023). Modal and harmonic analysis of the rotor system involving four different materials by finite element code: ANSYS Workbench. Materials Physics and Mechanics, 51(7), 63–98.
21. Li, J., Wei, Y., Gao, H., Song, X. and Jia, Z. (2024). Improved calculation method for dry modal analysis of a four-stage centrifugal-pump rotor system based on the concentrated-mass method. PLoS ONE, 19.
22. Zhang, X., Liu, Y., Wang, H. and co-authors (2024). Modeling and dynamic analysis of double-row angular contact ball bearing–rotor–disk system. Lubricants, 12, 441.