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Dr. Öğr. Üyesi Saeed LOTFAN
Makine Mühendisliği

Saeed LOTFAN
Telefon
(262) 605 26 58
E-Posta
slotfan@gtu.edu.tr
Ofis
H2 Blok, 123
Çalışma alanları
Doğrusal Olmayan Titreşimler, Yapısal Dinamikler, Nano-Yapıdaki Malzemelerin Dinamiği, Dönen Yapılarin Dinamiği, Doğrusal Olmayan Sistemlerin Tanımlamasi, Kararlılık ve Çatallanma Analizi
Detaylı özgeçmiş
SaeedLotfan_OG.pdf

* Research Projects

Dynamics of Rotating Blades

TUBITAK 1001- The Scientific and Technological Research Projects Funding Program (2023-2025)

Project Title: Nonlinear vibrations of a high-fidelity model of rotating pre-twisted blades with thickness and chord length variations including nonlinear centrifugal effects

PI: Saeed Lotfan

Partner: Middle East Technical University

* Journal Articles

  1. Lotfan, S., Dedekoy, D., Bediz, B. and Cigeroglu, E. A weak-form spectral Chebyshev technique for nonlinear vibrations of rotating functionally graded beams. Mechanics of Advanced Materials and Structures, 1–15 (2023).

  2. Lotfan, S. Nonlinear modal interactions in a beam-mass system tuned to 3:1 and combination internal resonances based on correspondence between MTS and NSI methods. Mechanical Systems and Signal Processing 164, 108221 (2022).

  3. Lotfan, S., Anamagh, M. R., Bediz, B. and Cigeroglu, E. Nonlinear resonances of axially functionally graded beams rotating with varying speed including Coriolis effects. Nonlinear Dynamics 107, 533–558 (2022).

  4. Lotfan, S. and Bediz, B. Free vibrations of rotating pre-twisted blades including geometrically nonlinear pre-stressed analysis. Journal of Sound and Vibration 535, 117109 (2022).

  5. Lotfan, S., Anamagh, M.R. and Bediz, B. A general higher-order model for vibration analysis of axially moving doubly-curved panels/shells. Thin-Walled Structures 164, 107813 (2021).

  6. Lotfan, S., Biglari, H., Choupani, A. and Bediz, B. Dynamics of carbon nanotubes under thermally induced nanoparticle transport on helical tracks. Applied Mathematical Modelling 93, 684–707 (2021).

  7. Ghiasi, R.A., Fallah, M., Lotfan, S. and Rosen, M. A new approach for optimization of combined cycle system based on first level of exergy destruction splitting. Sustainable Energy Technologies and Assessments 37, 100600 (2020).

  8. Zinati, R.F., Rezaee, M. and Lotfan, S. Nonlinear vibration and stability analysis of viscoelastic rayleigh beams axially moving on a flexible intermediate support. Iranian Journal of Science and Technology, Transactions of Mechanical Engineering 44, 865-879 (2020).

  9. Lotfan, S., Shahyad, S., Khosrowabadi, R., Mohammadi, A. and Hatef, B. Support vector machine classification of brain states exposed to social stress test using EEG-based brain network measures. Biocybernetics and Biomedical Engineering 39, 199–213 (2019).

  10. Varahram, S., Jalali, P., Sadeghi, M.H. and Lotfan, S. Experimental study on the effect of excitation type on the output-only modal analysis results. Transactions of FAMENA 43, 37–52 (2019).

  11. Lotfan, S. and Fathi, R. Parametric modeling of carbon nanotubes and estimating nonlocal constant using simulated vibration signals-ARMA and ANN based approach. Journal of Central South University 25, 461–472 (2018).

  12. Shervani-Tabar, M.T., Ettefagh, M.M., Lotfan, S. and Safarzadeh, H. Cavitation intensity monitoring in an axial flow pump based on vibration signals using multi-class support vector machine. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, 3013–3026 (2018).

  13. Fathi, R., Lotfan, S. and Sadeghi, M.H. Influence of imperfect end boundary condition on the nonlocal dynamics of CNTs. Mechanical Systems and Signal Processing 87, 124–135 (2017).

  14. Lotfan, S. and Sadeghi, M.H. Large amplitude free vibration of a viscoelastic beam carrying a lumped mass–spring–damper. Nonlinear Dynamics 90, 1053–1075 (2017).

  15. Sadeghi, M.H. and Lotfan, S. Identification of non-linear parameter of a cantilever beam model with boundary condition non-linearity in the presence of noise: an NSI-and ANN-based approach. Acta Mechanica 228, 4451–4469 (2017).

  16. Fathi, R. and Lotfan, S. The effect of calibrated nonlocal constant on the modal parameters and stability of axially compressed CNTs. Physica E: Low-dimensional Systems and Nanostructures 79, 139–146 (2016).

  17. Lotfan, S., Fathi, R. and Ettefagh, M.M. Size-dependent nonlinear vibration analysis of carbon nanotubes conveying multiphase flow. International
    Journal of Mechanical Sciences
    115, 723–735 (2016).

  18. Lotfan, S., Ghiasi, R.A., Fallah, M. and Sadeghi, M.H. ANN-based modeling and reducing dual-fuel engine’s challenging emissions by multi-objective evolutionary algorithm NSGA-II. Applied energy 175, 91–99 (2016).

  19. Rezaee, M. and Lotfan, S. Non-linear nonlocal vibration and stability analysis of axially moving nanoscale beams with time-dependent velocity. International Journal of Mechanical Sciences 96, 36–46 (2015).

* Peer-reviewed Articles

  1. Sadeghi, M. H. and Lotfan, S. Identification of nonlinear modal interactions in a beam-mass-spring-damper system based on mono-frequency vibration response (In Persian). Computational Methods in Engineering 38, 19– 36 (2019).
  2. Sadeghi, M. H. and Lotfan, S. Stability and bifurcation analysis of a beam-mass-spring-damper system under primary and one-to-three internal resonances (In Persian). Modares Mechanical Engineering 17(2), 166–176 (2017).
  3. Sadeghi, M. H. and Lotfan, S. Nonparametric system identification of a cantilever beam model with local nonlinearity in the presence of artificial noise (In Persian). Modares Mechanical Engineering 16(11), 177–186 (2016).
  4. Fathi, R., Lotfan, S. and Ettefagh, M. M. Statistical analysis of random uncertainty in the pipes conveying multi-phase flow based on nonlinear dynamic model (In Persian). Modares Mechanical Engineering 15(8), 323– 331 (2015).
  5. Rezaee, M., Lotfan, S. and Maleki, V. A. Introducing a New Crack Disturbance Function for Transverse Vibration Analysis of a Cracked Beam (In Persian). Journal of Applied and Computational Sciences in Mechanics 25(2), 19–32 (2014).

* Conference Proceedings

  1. Çopur, F. and Lotfan, S. On the misinterpretation of structural damping in harmonic response of rotordynamic systems: commercial tools perspective in 7th International Conference on Engineering Sciences (2024), 1-8.
  2. Rahmanian, M., Motlagh, P. L. and Lotfan, S. A modified trigonometric higher-order shear and normal deformation theory for free vibration analysis of composite conical shells in 2nd International Conference on Nonlinear Solid Mechanics (2022).
  3. Adiban, H., Lotfan, S. and Mashroutechi, A. Bearing fault detection based on vibration signals using k-Means and fuzzy clustering methods (In Persian) in 2nd National Conference on Electrical, Mechanical and Mechatronic (2015), 1–6.
  4. Lotfan, S., Salehpour, N., Adiban, H. and Mashroutechi, A. Bearing fault detection using fuzzy C-means and hybrid C-means-subtractive algorithms in 2015 IEEE International conference on fuzzy systems (FUZZ-IEEE) (2015), 1–7.
  5. Ettefagh, M. M., Mashroutechi, A., Lotfan, S. and Adiban, H. Bearing fault detection using classification method based on genetic algorithm using vibration signals (In Persian) in 3rd International Conference on Acoustics and Vibration (2013), 1–8.
  6. Rezaee, M., Lotfan, S. and Maleki, V. A. Using disturbance function for vibration analysis of beams with an open edge crack (In Persian) in The 20th Annual International Conference of Iranian Society of Mechanical Engineers (2012), 1–4.

* Master's Degree

  1. Çopur, Furkan (2024) A unified model for internal rotordynamic stability based on complex coordinates formulation.
  • Doktora: University of Tabriz, Mechanical Engineering, 2014-2018
  • Yüksek lisans: University of Tabriz, Mechanical Engineering, 2012-2014
  • Lisans: University of Tabriz, Mechanical Engineering, 2008-2012