Biography

Hamid Bahai received his PhD degree in 1993 in Computational Mechanics from Queen Mary College, University of London, Between 1993 and 1995 he worked as a Senior Research Engineer at T&N Technology where he was involved in research and development work on a number of projects for the automotive and aerospace industries. This was followed by a period at Halliburton Inc during which time he carried out design and analysis of a number of major offshore structures. In 1996 he moved to the aerospace industry by joining Matra Marconi Space where, as a principal engineer, he played a leading role in conducting design, mathematical modelling and computational analysis of Euro3000 space craft structures and Arian5 launcher / spacecraft adapter. He was made a Fellow of the Institute of Mechanical Engineers in 1996. In 1998 he returned to academia and joined Brunel University as a lecturer. He became a senior lecturer in 2004, a reader in 2005 and a Professor of Computational Mechanics in 2009. Professor Bahai has led a number of research projects in the area of computational mechanics and has written monographs on various topics in this field. He has contributed about 90 papers to the open press.

Research Interests

· structural dynamics: inverse eigen value analysis

· non- linear finite element analysis of structures

· formulation and implementation of a new non-linear strain based shell element

· development of a hyper-elastic constitutive law of conjugate stresses and strain

· tensors

· structural design optimisation: factorial design methods, genetic algorithm,

· application of neural networks in simulation of ocean waves

· fatigue analysis of structures: modelling of crack initiation and propagation in

· structural components; weight function techniques, multi scale modelling of crack propagation.

· development of nonlinear fluid-solid algorithms and codes for coupled analysis of

· deep water flexible risers; formulation & development of a new nonlinear riser

· element

· finite element multi-physics analysis: application areas: elasto-hydrodynamics

· modelling of journal bearings; simulation of cardiovascular devices used in minimally

· invasive surgery

· development of constitutive models and special purpose finite element codes for a

· variety of different applications

Publications

Refereed Journal Papers:

1- Bahai, H., Esat, I.I., ‘A hybrid model for analysis of complex stress distribution in threaded connectors’, J. of Computers & Structures, Vol. 52, No. 1, pp. 79-93, 1994.

2 - Bahai, H., Esat, I.I., ‘A factorial design approach to investigate the effect of geometry in drill string screw connectors’, ASME J. of Engineering Resource Technology, Vol. 117. pp 75, June 1995,.

3 -Bahai, H., Glinka, G. and Esat, I.I., ‘ Numerical and experimental evaluation of stress intensity factors for threaded connectors’, J. of Engineering Fracture Mechanics, Vol. 54, No. 6 pp 835-845, 1996.

4 - Bahai, H., Xu, H., ‘Three dimensional elasto-plastic FE and EHD analysis of journal bearings’, J. of Mechanical Engineering Science, Part C, Vol. 211, Proc. of the IMechE, 1997.

5 - Esat, I.I., Bahai, H, ‘A theory of complete force & moment balancing of planar linkage mechanism’, Mechanism & Machine Theory J, pp1-20,1998.

6 - Esat, I.I., Bahai, H., Shati, F.K., ‘ Finite element modelling of anisotropic elastic-viscoplastic behaviour of metals’, J. of ‘Finite Elements in Analysis & Design’, 32, pp279-287, 1999.

7 - Esat, I.I., Bahai, H., ‘ Vibratory system synthesis for multi-body systems based on genetic algorithm’, J. of Sound & Vibration, vol. 230, No. 4, pp933-948, March 2000.

8 - Esat, I.I., Bahai, H., ‘Surface alignment based on moment of inertia & improved least square Method’, IMechE’s J. of Engineering Manufacturing, Proceedings Part B, Vol. 214 Part B, pp 547-554, September 2000.

9 - Shati, F.K., Esat, I.I., Bahai, H., ‘FEA modelling of visco-plastic behaviour of metal matrix composites’, J. of ‘Finite Elements in Analysis & Design’, vol 34, No 4, pp 263-272, April 2001.

10 - Bahai, H. ‘ A parametric model for axial and bending stress concentration factors in API drill-string threaded connectors’, International Journal of Pressure Vessels and

Piping, vol. 78 (7), pp. 495-505, 2001.

11 - Djoudi, M. S., Bahai, H, Esat, I., ‘ An Inverse Eigen-value formulation for optimising the dynamic behaviour of pin-Jointed structures’, J. of Sounds and Vibration, vol. 253, no. 5, pp. 1039-1050(12), June 2002.

12- Bahai, H., Farahani, K., Djoudi, M. S., ‘Eigenvalue inverse formulation for optimising Vibratory behaviour of truss and continuous structures’, J. of Computers and Structures, Special issue 80/27-30, pp. 2397-2403, 2002.

13- Bahai, H., Aryana, F., ‘ Design optimisation of structures vibration behaviour using

first order approximation and local modification’, J. of Computers & Structures, vol. 80 no. 26, pp 1955 – 1964, October 2002.

14 - Belhadj, A., Bahai, H., ‘ Friction-slip: an efficient energy dissipating mechanism for suddenly released pre-stressing bars’, J. of Engineering Structures’, 23, pp 934-944, 2003

15 - Djoudi, M. S., Bahai, H, ‘A Shallow shell finite element for the linear and non-linear analysis of cylindrical shells’, J. of Engineering Structures, 25, pp769-778, 2003.

16- Aryana, F., Bahai, H., ‘ Sensitivity analysis and modification of structures vibration behaviour using second order theory’, J. of Engineering Structures, 25, pp 1279-1287, 2003.

17- Farahani, K. & Bahai, H.,’ Hyper-Elastic constitutive equations of conjugate stresses and strain tensors for the Seth-Hill strain measures, International J. of Engineering Science’, Volume 42, Issue 1, Pages 29-41, January 2004.

18- Djoudi, M. S., Bahai, H, ‘ A cylindrical strain based shell element for vibration analysis of shell structures’ J. of Finite elements in analysis & Design, vol. 40, issue 13-14, pp 1047-1961, August 2004, .

19- Djoudi, M. S., Bahai, H, ‘ Strain based finite element for the vibration of cylindrical panels with openings’, J. of Thin-Walled Structures 42, 575-588, 2004.

20- Farahani, K., Bahai, H., ‘An inverse strategy for relocation of Eigen frequencies in structural design’ Part I: A First order approximate solution, J. of Sound & Vibration 274, pp 481-505, 2004.

21- Farahani, K., Bahai, H., ‘An inverse strategy for relocation of Eigen frequencies in structural design’ Part II: A second order approximate solution, J. of Sound & Vibration 274, pp 507-528, 2004.

22- Naber, R, Bahai, H., Jones, B., ‘A reciprocal band-limited Green's function approach for modelling acoustic emission using the finite element method’, J. of Sound & Vibration 292, pp 802-823, 2006.

23 - Nabar, R, Bahai, H., ‘Analytical and experimental validations of a numerical band-limited Green’s function approach for modelling acoustic emission waves’, J. of Advances in Engineering Software, Vol. 38, Issue 11-12, pp 876-885, . November-December 2007,

24 – Bazargan, H., Bahai, H., Aminzadeh-Gohari, A.,, ‘Calculating the return value using a mathematical model of significant wave height’, J. Marine Science Technology, Vol 12, No 1, pp 34-42, 2007.

25- Aryana, F., Bahai , H., Mirzaeifar, R., Yeilaghi, ‘Modification of FGM plate with integrated piezoelectric layers using first and second order approximations’, International J. of Numerical Methods in Engineering, Vol 70, pp 1409-1429, 2007.

26- Bazargan, H., Bahai, H. and Aryana, F, ‘Simulation of Zero up-crossing period by hybrid artificial neural networks / simulated annealing’ , Journal of Marine Science & Technology, J. Marine Science Technology, Vol 12, No 1, pp27-33, 2007.

27 - Mirzaeifar, R., Bahai, H., Aryana, F., Yeilaghi, A., ‘Optimization of the dynamic characteristics of composite plates using an inverse approach’, J. of Composite Materials, 12, vol. 41, pp 3091-3108, 2007.

28 – Hosseini-Kordkheili, S. A., Bahai, H., ‘A non-linear finite element for simulating the behaviour of flexible risers with soil interaction boundary condition’, Archives of Applied Mechanics, vol. 78, no. 10, pp 765-774, October 2008

29- Bahtui, A., Bahai, H., Alfano, G., ‘A finite element analysis for un-bonded flexible risers under torsion, ASME J. of Offshore and Arctic Engineering’, 130(4): 041301 (4 pages), 2008.

30- Mirzaeifar, R., Bahai, H., Shahab, S., ‘A new method for finding the first and second order eigen derivatives of asymmetric non-conservative systems: application to an FGM plate actively controlled by piezoelectric sensor/actuators, International J. of Numerical Methods in Engineering, vol 75, No. 12, pp 1492-1506, September 2008.

31- Mirzaeifar, R., Bahai, H., Shahab, S., Active control of natural frequencies of FGM plates by piezoelectric sensor/actuator pairs’, J. of smart Materials & Structures vol. 17(4): 045003 ,August 2008.

32 - Mirzaeifar, R., Shahab, S., Bahai, H., An approximate method for simultaneous modification of natural frequencies and buckling loads of thin rectangular isotropic plates. Engineering Structures. 31(1): pp 208-215, 2009

33- Bazargan, H., Bahai., H., Aminzadeh, A. ‘Simulation of significant wave height by artificial neural networks / simulated annealing algorithm and its application in forecasting and extreme wave analysis’, J. of Atmospheric and Oceanic Technology,

34- Bahtui, A., Bahai, H., Alfano, G., 'Numerical and analytical simulation of unbounded flexible risers', . ASME J. of Offshore and Arctic Engineering, Vol 26, issue 4, pp. 778–792

35 - Alfano G., Bahtui A., Bahai H., ‘Numerical derivation of constitutive models for unbonded flexible risers’, International Journal of Mechanical Sciences, Vol 51, Issue 4, Pages 295-304, Apr 2009.

36 - Haghayeghi, R., Zoqui, E., J., , Bahai, H., An investigation on the effect of intensive shearing on the grain refinement of A5754 aluminium alloy, Journal of alloys and compounds, Vol 481, Issue 1-2, pp 358-364, July 2009.

37 - Shahab, S., Mirzaeifar, R., Bahai., Simultaneous modification of natural frequencies and buckling loads of composite cylindrical panels, International Journal of Mechanical Sciences, Volume 51, Issues 9-10, Pages 631-740, September-October 2009.

38 - Haghayeghi, R., Zoqui, E., Eskin, D. G., Bahai, H., Grain refinement of an Al-10% Mg alloy by intensive shearing in the liquid state, Materials Science and Engineering A., DOI:10.1016/j.jallcom.2009.06.085

Under Review

39- Yasseri, S., Bahai, H., Bazargan, H., Aminzadeh, A., Prediction of Safe Sea-states using finite element method and artificial neural network’, J. of Ocean Engineering

40- Hosseini-Kordkheili, S. A., Naghdabadi, Bahai, H., ‘Thermoelastic analysis of functionally graded axisymmetric shells using the finite element method’, European Journal of Mechanics A/Solids

41 – Hosseini-Kordkheili, A., Bahai, H., A non-linear formulation for dynamic analysis of flexible riser structure, ASME J. of Offshore and Arctic Engineering.

42 - Hosseini-Kordkheili, S. A., Bahai, H., ‘,A non-linear finite element formulation using an efficient linearized updated Lagrangian formulation with application in large displacement dynamic analysis of three-dimensional flexible riser structures, International J. of Mechanical Sciences.

43 - Bahtui A., Alfano G., Bahai H., Hosseini-Kordkheili S.A., ‘A multi-scale computational model for unbonded flexible risers’, International J. of Computers & Structures

44 – Bahtui, A., Bahai, H., Alfano, G., Three dimensional finite element analysis of unbonded flexible risers, ASME J. of Offshore and Arctic Engineering.

45 - Haghayeghi, R., Zoqui, E., J., , Bahai, H., Melt conditioner direct chill casting (MCDC) of 7075 wrought Aluminium alloy, CRIP- Journal of Manufacturing Science and Technology.

Refereed Conference Proceedings:

46 - Bahai, H., Borthwick, W.K.D., Charlesworth, S.G. and Murray, J.L., ‘Integrated computer Aided engineering of insulating joint couplings’, Proc. of OMAE, Offshore Mechanics & Arctic Engineering, Sponsored by the ASME, 1988, Texas.

47 - Bahai, H., Esat, I.I., ‘A matrix approach to the analysis of load & stress distribution in Threaded Connectors’, Proc. of ISOPE, Int. Soc. of Offshore & Polar Eng., 1991, Vol. II, PP. 157-163.

48 - Bahai, H., Esat, I.I. and Lawrence, J., ‘ A hybrid modeling approach to 3D stress analysis of threaded connections’, ESDA Con. on Engineering Systems Design & Analysis, 1992, Istanbul, Sponsored by the ASME.

49 - Bahai, H., Esat, I.I., ‘Study of axial and bending stress concentration factors in screw connectors’, PD-Vol. 64-8.3, Engineering Systems Design & Analysis, Volume 8, Part C, PP 753-761, ASME Proceedings, 1994.

50 - Esat, I.I., Bahai, H., ‘ Genetic algorithm based vibration systems’, Proc. of design re-use conference, June 1998, Brunel University, ISBN 1 86058, Professional Engineering Publishing, PP221-232.

51 - Djoudi, M., S., Bahai, H., Stiffness parameter modifications for desired frequencies, ASME 14-17 Feb. 2000, ETCE/OMAE New Orleans, Vol. I453CD.

52 - Djoudi, M. S., Bahai, H., Vibration of cylindrical panels with cut-outs using strain based finite element, ASME 14-17 Feb. 2000, ETCE/OMAE New Orleans, Vol. I453CD.

53- Bahai, H., ‘Design of insulating joint couplings’, Proc. of Engineering Design Conference 2000, London, UK, PP 313-326, ISBN 1 86058 259 1, Professional Engineering Publishing

54 - Djoudi, M. S., Bahai, H, ‘Strain based shallow cylindrical finite element based on assumed strains’, Proc. of Engineering Design Conference 2000, London, PP 370-387, ISBN 1 86058 259 1, Professional Engineering Publishing

55 - Djoudi, M. S., Bahai, ‘H, Shifting natural frequencies by structural parameters modification’ Proc. of ASME ESDA 2000 Montreux, Switzerland, 10-13 July 2000, vol 82, pp 291 – 297.

56 - Belhadj, A., Bahai, H., ‘ Debounding of pre-stressing bars at high rate of loading’, the Proc. of ASME ESDA 2000 Montreux, Switzerland, 10-13 July 2000, vol 82, pp 445-452.

57 - Bahai, H., ‘ Non-linear finite element analysis of journal bearings ’, Proc. of Modern Practice in Stress & Vibration Analysis, June 2000, Chameleon Press Ltd., ISBN 1 901537 218, PP 389-402, Nottingham, June 2000, UK.

58 - Djoudi, M. S., Bahai, H, ‘A shell finite element for the general analysis of cylindrical shells’, Proc. of 5^th International Conference on Computational Structures Technology. Leuven, Belgium 6-8 Sep. 2000, Chameleon Press Ltd., ISBN 1 901537 218, PP 389-402.

59 - Djoudi, M. S., Bahai, H, ‘Physical parameters modifications for specified eigenfrequencies’, Proc. of 5^th International Conference on Computational Structures Technology’. Leuven, Belgium 6-8 Sep. 2000, Sept. 2000, ISBN 0-948749687, Meigle Printers Ltd., pp135-140.

60 – Djoudi, M. S., Bahai, H., ‘Relocation of natural frequencies using physical parameter modifications’, Proc. ff the first MIT conference on Computational Fluid and Solid Mechanics, June 11 –15, 2001, MIT, vol. 1, ISBN: 0-08-043956-X.

61 – Aryana, F., Bahai, H., ‘Design optimisation of structures vibration behaviour’, Proc. of the first MIT conference on Computational Fluid and Solid Mechanics, June 11 –15, 2001, MIT, (abstracts), ISBN: 0-08-043956-X.

62 - Farahani, K., Bahai, H., ‘A Condensation method for the solution of general contact-impact Problem, Proc. Of the 2002 World’s Congress on Computational Mechanics

63 – Aryana, F., Bahai, H., Modification of structural dynamics behaviour based on linearised Second Order Approximation, Proc. Of the 2002 World’s Congress on Computational Mechanics

64 – Tewfic, T., Sarhadi, M., Bahai, H., ‘investigation of an automated cell for manufacturing aerospace composite structures’, SAMPE 2002 Aerospace Proc., 12-16 May 2002, California.

65 – Rees, D., Bahai, H., Taylor, S., ‘Notch concentrations under combined tension-compression’, Proc. of 6^th Int. conf. on computer structural technology’, Prague September 2002.

66 – Farahani, K., Bahai, H., ‘ Hyper-elastic constitutive equations of conjugate stresses and strain tensors for the Seth-Hill Strain measures’, proc. of 3^rd Int. conf. on engineering computational technology’, Prague September 2002.

67 - Tewfic, T., Sarhadi, M., Bahai, H., ‘ Modelling & simulation of a flexible manufacturing cell for aerospace composite structures’, Proc. Of 15^th International Congress on Condition Monitoring & Diagnostic Engineering Management (COMADEM 2002), pp 419-428, 2003.

68 - Farahani, K & Bahai, H., ‘Inverse second order formulations for relocation of eigen frequencies’, the Proc. of the second MIT conference on computational fluid and solid mechanics, 2003

69 - Farahani, K & Bahai, H., ‘Hyper-Elastic constitutive equations for conjugate stresses and Strains’, Proc. of the second MIT conference on computational fluid and solid mechanics, 2003

70 - Farahani, K & Bahai, H., ‘ Direct methods for contact / impact problems’, Proc. of the BICOM conference on the mathematics of finite elements and applications, pp 46, 21-24 June 2003.

71 - Farahani, K & Bahai, H., ‘Generalized Hooke’s law for hyper-elastic constitutive equations in large elastic deformations, Proc. of the BICOM conference on the mathematics of finite elements and applications, pp 47, 21-24 June 2003

72- Farahani, K & Bahai, H., Rees, D., Finite element simulation of rim and pole failure for elliptical bulging of orthotropic sheet metals, International conference on advances in materials and processing technology, Dublin City University, July 8-11, 2003

73 - Naber, R, Bahai, H., Numerical evaluation of a band-limited Green’s function using the finite element technique for acoustic emission analysis, ASME ESDA 2004 conference, Manchester, UK.

74 - Naber, R, Bahai, H., ‘Numerical, analytical & experimental evaluation of acoustic emission transient waves in an isotropic plate, accepted for presentation at the Seventh International Conference on Computational Structures Technology, Lisbon, 7-9 September 2004

75 - Bazargan, H., Bahai, H.’ Prediction of sea state for pile driving using neural networks and finite element simulation, ASME conference on offshore mechanics and arctic engineering, 2005, Greece.

76 - Nabar, R., Bahai, H., An efficient numerical approach for modelling acoustic emission using higher-order elements – An application to a unidirectional fibre-reinforced composite sample, 3rd MIT conference on computational fluid and solid mechanics, MIT, June, 2005.

77 - Bazargan, H., Bahai, H., Aryana, F., Yasseri, S., Simulation of mean-up-crossing period using neural network trained with simulated annealing algorithm. ASME proc. of 2006 OMAE conference.

78 - Hosseini, S. A., Bahai, H., A non linear finite element for simulation of deep water flexible riser pipes, Proc. of Mathematics of finite elements and application (MAFELAP) conference, June 2006, Brunel University, UK.

79 - Hosseini Kordkheili, S. A., and Bahai, H., Nonlinear finite element modelling of flexible Risers using a pipe elbow element, Proc. of the 8^th international conference on computational structures technology, 2006, Spain.

80 – Bahtui, A., Bahai., H., Alfana, G., Numerical and analytical modelling of un-bonded flexible risers, ASME conference on offshore mechanics and arctic engineering, 2007, Saint Diego.

81 – Hossieni-Kordkheili, A. S., Bahai, H., A non linear finite element for simulation of flexible risers with touch down boundary condition. ASME conference on offshore mechanics and arctic engineering, 2007, Saint Diego.

82 – Bazargan, H., Bahai, H. Neural based simulation of significant wave height, ASME conference on offshore mechanics and arctic engineering, 2007, Saint Diego.

83- Mirzaeifar, M. R., Bahai, H., Shahab, H., S. Modification of stiffness for shifting natural frequencies of functionally graded material (FGM) plate actively controlled by piezoelectric sensor/actuator pairs, The Eleventh International Conference on Civil, Structural and Environmental Engineering Computing, Malta, 2007.

84- Bahtui, A., Bahai, H., Alfana, G, Numerical and analytical simulation of un-bonded flexible risers subjected to combined modes of loading, 9th US National Congress on Computational Mechanics, Minisymposium: 095 - Session 1: Computational Methods for Large Structures and Materials, San Francisco, California, July 22-26, 2007.

85 - Bahtui, A., Bahai, H., Alfana, G, Finite element analysis of unbonded flexible risers under tension, ASME  conference on offshore mechanics and arctic engineering (OMAE), 2008, Estoril, Portugal,  15-20 June 2008, Paper No. OMAE2008-57627.  

86 - Hosseini-Kordkheili, S. A., Bahai, H.,  Non-linear dynamic analysis of flexible riser structure,  ASME  conference on offshore mechanics and arctic engineering (OMAE), 2008, Estoril, Portugal,  15-20 June 2008, Paper No. OMAE2008-58014. 

87 - Bahai, H Hosseini-Kordkheili, S., A., Non-linear finite element analysis of unbonded flexible risers, 8th World Congress on Computational Mechanics, June 2008, Italy. 

88 - Hosseini-Kordkheili, A. S.,  Bahai, H., A non-linear finite element formulation using an efficient linearized updated Lagrangian formulation with application in large displacement dynamic analysis of three-dimensional flexible riser structures, 8th World Congress on Computational Mechanics, June 2008, Italy.

89 - Bahtui, A., Bahai, H., Alfana, G, Constitutive Modelling of Unbonded Flexible Risers Under Tension, 8th World Congress on Computational Mechanics, June 2008, Italy.

90 - Bahai, H., Shahab, S., Mirzaeifar, R., Simultaneaous modification of natural frequencies and buckling loads of composite cylindrical panels. 17^th UK conference on Computational Mechanics, ACME UK, 2009 Nottingham.

91 - Bahai, H., Mirzaeifar, R., Shahab, S., Calculating first and second order eigen derivatives of asymmetric non-conservative systems., Mathematics of finite elements and application (MAFELAP) conference, 2009, Brunel University, UK.

92 - Edmans, B., Bahtui, A., Alfano, G., Bahai, H., Multi-scale modelling of flexible pipes, 17^th UK conference on Computational Mechanics, ACME UK, 2009 Nottingham.

93 – Bahtui, A., Alfano, G., Bahai, H., Non-linear finite element modelling of un-bonded flexible risers under multi-mode loading., OMAE 2009, Honolulu.