Research

My main Research is related to Nonlinear System Identification. 

As a PhD full time student in The Manchester School of Engineering,UK, with research activity follows: to improve the Resonant Decay Method (RDM) for identifying multi-degree of freedom systems with non-linearity, which could be cubic or quadratic stiffness non-linearity with coupling & close modes. This method is called “Non-linear RDM” and may be used for multi-input/multi-output continuous systems. As part of the research, the sensitivities of the method to Errors (e.g. Mode Shape, Natural Frequency, Force Vector, Quantization, Noise etc.) and the effects of Rigid Body and out of range modes have been evaluated. Studies on realistic Shaker Dynamics and implementation of optimal shaker placement have been explored. Finally, some good agreements results between identified parameters and measured physical parameters are obtained by experimental tests through the method.

 

PUBLICATIONS:

BOOK:

English Language for Mechanical Engineering Students, ISBN: 978-964-6654-58-7, Published in Oct. 2010.

 

Journal Papers:

1.      “Experimental and Numerical Study of Structural Identification Using Non-linear Resonant Decay Method”, Mehdi Sarmast, Hamed Ghafari, Jan R. Wright. It is accepted by Sound & Vibration Magazine, Tech Science Press, S&V: Sound and Vibration, Vol.53, Issue 3,2019 , pp. 75-95 , 2019  (doi:10.32604/sv.2019.04193)

2.      “Rigid Body Modes on Non-linear Resonant Decay Method”, Mehdi Sarmast and Jan R. Wright, Jounal of Applied Mechanics and Materials Vols. 52-54 (2011) pp 1068-1073, Trans Tech Publications, Switzerland, doi:10.4028/ www.scientific.net/AMM.52-54.1068, ISSN: 1662-7482.

3.      “Residual Modes on Non-Linear Resonant Decay Method”, by Mehdi Sarmast and Jan R. Wright, Journal of Lecture Notes in Engineering and Computer Science, Year: 2010 Vol: 2184 Issue: 1, ISSN: 2078-0958.

4.      “Sensitivity of NL-RDM to Errors in Parameters used from the Underlying Linear System”, by Mehdi Sarmast and Jan R. Wright, Proc. ASME. 43833; Volume 10: Mechanical Systems and Control, Parts A and B: 997-1006.January 01, 2009, ISBN: 978-0-7918-4383-3, ASMECP002009043833000997000001, (doi: 10.1115/IMECE2009-11994).

5.      “Sensitivity of NL-RDM to Errors in the Non-linear Test Process”, by Mehdi Sarmast, M. Mehran and Saeed B M Moqadam, Proceedings of the ASME 2009 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, pp. 431-440, 20-24 Sep. 2009, Oxnard CA, USA. ISBN: 978-0-7918-4896-8. (doi:10.1115/SMASIS2009-1275)

6.      “Identification of multi-degree of freedom non-linear systems using an extension of force appropriation”, by M F Platten, J R Wright, J E Cooper and M Sarmast, Proceedings of SPIE - The International Society for Optical Engineering, vol. 4753 II, pp. 957–963, 2002.

 

Conference Papers:

1)      “A new practical approach for improving the accuracy in NL-RDM by experimental testing for non-linear systems”, Mehdi Sarmast, Kia Mashhoon, The biennial ISMA conference on Noise and Vibration Engineering. ISMA2014 in Leuven, Belgium, September 15-17, 2014.

2)      “Dynamic Experimental Testing Setup And Evaluation For Non-Linear Resonant Decay Method (NLRDM)”, Mehdi Sarmast and Jan R. Wright, Second International Conference on Acoustic and Vibration, ISAV2012, Sharif University of Technology, Tehran, Iran, 26-27 Dec. 2012.

3)      “Identification of Multi-Degree of Non-Linear Systems Using an Extension of Force Appropriation”, Mehdi Sarmast and Jan R. Wright, First International Conference on Acoustic and Vibration, ISAV2011, AmirKabir University, Tehran, Iran, 21-22 Dec. 2011.

4)      “Effects of Burst Length Inaccuracies on Non-Linear System Identification”, Mehdi Sarmast, 10th WSEAS International Conference on Non-Linear Analysis, Non-Linear Systems and Chaos (NOLASC '11), Iasi, Romania, July 1-3, 2011.

5)      “Residual Modes on Non-Linear Resonant Decay Method”, by Mehdi Sarmast and Jan R. Wright, Proceedings of the World Congress on Engineering 2010, 30 June – 2 July 2010, London, UK, Vol. II WCE 2010, pp.1515-1522, ISBN: 978-988-18210-7-2.

6)      “Experimental Identification of Continuous Non-linear Systems using an Extension of Force Appropriation”, by J R Wright, M F Platten, J E Cooper and M Sarmast, 21st International Modal Analysis Conference, Florida, USA, 2003.

7)      “Identification of Multi-Degree of Freedom Non-linear Systems using an Extension of Force Appropriation”, by M F Platten, J R Wright, J E Cooper and M Sarmast, IMAC XX, Los Angeles, 2002.

8)      “Identification of multi-degree of freedom non-linear simulated and experimental systems”, by M.F. Platten, J.R. Wright, J.E. Cooper, M. Sarmast, Proceedings of the International Conference on Noise and Vibration Engineering (ISMA 2002), pp.1195-1202, Leuven, Belgium, 16-18 September 2002.

9)       “Investigation of Error Sources in Non-linear Identification using Extension Resonant Decay Method” ,by M Sarmast, J R Wright, M F Platten, J E Cooper, 9th ISS in Europe, Birmingham, 2002.

10)   “Identification of Multi-Degree of Freedom Weakly Non-linear Systems Using a Modal based in Modal Space” , by J R Wright, M F Platten, J E Cooper and M Sarmast, COST Conference, pp. 49-68, (Keynote Paper), Kassel, Germany, September 2001.

11)   "Identification of Non-linear Multi-Degree-of-Freedom Systems using a Force Appropriation Approach" ,by J R Wright, M F Platten, J E Cooper and M Sarmast, Proceedings of the 25th International Conference on Noise and Vibration Engineering, ISMA, pp. 461–464, Leuven, 2000.

12)   "Application of the Resonant Decay Method to the Identification of Non-linear Multi-Degree-of-Freedom Systems”, by J R Wright, M F Platten, J E Cooper and M Sarmast, International Conference on Acoustics, Noise and Vibration, Montreal, 2000.