Publikatsioonid

2008
H. Hein and Ü. Lepik Regularization of the Trajectories of Dynamical Systems by Adjusting Parameters, in Proceedings Of World Academy Of Science, Engineering And Technology, Volume 33, September 2008, ISSN: 1307-6884, 328-332.
2007
H. Hein and Ü. Lepik.  Response of nonlinear oscillators with random frequency of excitation, revisited. Journal of Sound and Vibration, 301, 3-5, 3, 2007, 1040-1049 

Helle Hein, Jüri Kiho, Reimo Palm, Eno Tõnisson Programmeerimise ülesannete kogu, Tartu, 2007.

H. Hein Determination of foundation characteristics of vibrating beams using wavelet transform and neural network, in Wavelet Applications in Industrial Processing V, edited by Frederic Truchelet, Olivier Laligant, Proceedings of SPIE Vol. 6763 (SPIE Bellingham, WA, 2007) 676309, 1-9.

2006

H. Hein.  The Influence of Delamination on the Free Vibrations of Composite Beams on Pasternak Soil. Proc. Estonian Acad. Sci. Phys. Math., 2006, 55, 4, 220–234..

H. Hein.  Vibrations of composite beams with multiple delaminations. III European Conference on Computational Mechanics Solids, Structures and Coupled problems in Engineering, Lisbon, Portugal, 5–8 June 2006. Full paper in CD, 11p, ECCOMAS, APMTAC, Springer.

H.Hein Vibrations of composite beams with multiple delaminations . III European Conference on Computational Mechanics Solids, Structures and Coupled problems in Engineering C.A. Mota Soares et.al. (eds.), Lisbon, Portugal, 5–8 June 2006, Springer, 269.

H. Hein The influence of delamination and concentrated masses on the free vibrations of Euler beams on Pasternak soil. Dynamics Days Europe, 2006, 63-64.
A.Peder, H.Hein, L.Kimmel Objektorienteeritud programmeerimine. Praktikumiju-hend. Tartu 2006

2005

H. Hein_, Ü. Lepik  The effect of random frequency on chaotic motion of some nonlinear oscillators. Proceedings of Dynamics Days 2005, Berlin 25-28 July, 2005, pp97

Ü. Lepik and H. Hein.  On response of nonlinear oscillators with random frequency of excitation. Journal of Sound and Vibration, 288, 1-2, 22, 2005, 275-292.

H. Hein.  The Effect of Delamination on the Natural Frequencies of the Composite Beams on Two-Parameter Foundation. Journal of Structural Mechanics, 38, Nr. 3, 2005, 97 - 100.  Special issue for the 8th Nordic Seminar on Computational Mechanics.

H.Hein Optimization of strain-hardening plates of piece-wise constant thickness (6 pages). Papers of  The Fifth World Congress of STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION, paper no.104  CD -2005

2004


H.Hein. Vibrations of delaminated beams on elastic foundation.   NSCM: Proceedings of 17th Nordic Seminar on Computational Mechanics, Stockholm, 2004, 209 – 212.

H.Hein, Ü.Lepik Stochastic response of some nonlinear oscillators, In Proceedings International Conference – Dynamical Systems and Applications, July 05-10, 2004, Antalya, Turkey, 55.
H. Hein, Ü. Lepik Stochastic response of nonlinear oscillators, 5-10 July 2004, Antalya, Turkey – Dynamical Systems and Applications,  Proceedings, pp. 395-407.

2003

H. Hein Optimization of strain-hardening plates of piece-wise constant thickness. Short papers of structural and multidisciplinary optimization, 2003, 109-110.

2002

 J. Lellep, H. Hein Optimization of clamped plastic shallow shells subjected to initial impulsive loading, Engineering Optimization, 2002, 34, N5, 545 – 556.
H. Hein Optimal Design of Elastic-Plastic Laminated Beams, WCCM V World Congress on Computational Mechanics, 2002, Vienna, Austria.

2001

Hein H., Lellep J. Optimization of plastic shells subjected to impulsive loading. In WCSMO4  - Dalian, China, ISSMO, 2001.

2000

Hein H and Lellep J. Optimal plastic design of shallow curved beams with step–wise varying cross section. Mech. Struct. and Mach., 2000,  28(4), 355 – 365. 

Lellep J., Hein H. Optimization of stepped shells subjected to impulsive loading. 4-th Euromech. Solid Mechanics Conference, Metz, 2000 p.549.

1999

Hein H., Lellep J. Optimization of shallow shells with different yield stresses in tension and compression. Structural Optimization, 1999, 18, N2/3, 156 -161.

Lellep J., Hein H. Optimization of plastic shallow shells subjected to impulse loading. Short Paper proceedings, Third World Congress of Structural and Multidistsiplinary Optimization, May 17-21, 1999, Buffalo, Vol 1, 30-32.

1997

Hein H. Optimal plastic design of shallow spherical shells with step–wise varying cross section. Second World Congress of Structural and Multidistsiplinary Optimization, 1997, Vol.2, 829 – 833. 

Hein H. Optimization of plastic shallow shells with different yield stresses in tension and compression. Tenth Nordic Seminar on Computational Mechanics, Tallinn, 1997, 130 – 133.

1996

Lellep J., Hein H. Optimization of rigid – plastic shallow curved beams. Structural Optimization, 1996, 12, N1, 57 – 62.

1994

Lellep J.,Hein H. Optimization of clamped rigid–plastic shallow shells of piece–wise constant thickness. Int. J.  of Non – Linear Mechanics, 1994, 29, 4, 625 – 636.

Hein H. Optimal design of rigid-plastic annular plates with piece-wise constant thickness. Tartu Ülikooli Toimetised, 1994, 973, 48 – 59.

1993

Hein H., Lellep J. Optimal plastic design of shallow shells with step–wise varying cross section. Proc. Estonian Acad. Sci. Phys. Math., 1993, 42, 1, 22 – 31.

Lellep J., Hein H. Optimization of rigid – plastic shallow spherical shells of piece – wise constant thickness. Structural Optimization, 1993, 6, N2, 134 – 141. 

Hein H., Lellep J. Optimization of geometrically non–linear  rigid–plastic circular plates of piece–wise constant thickness. Prikl. Mekh. (Soviet Appl. Mech.), Kiew, 1993, 29, N6, 57 – 63.

Villems A., Pentel A., Koit M., Hein H. Pöial J., Hein K., Pandis A., Rünkaru E.  Arvutikursus algajale. Tartu Ülikool Täienduskskus, 1993.

1992

Lellep J., Hein H. An approximate analysis of large plastic deformations of circular and annular plates Tartu Ülikooli Toimetised, 1992, 939, 54 – 69.

1989

Lellep J., Hein H. Optimal design of plastic cylindrical shells with longitudinal rib – reinforcement (in Russian), Tartu Riikl. Ülik. Toim. (Trans. Tartu State Univ.), 1989, 853, 49 – 58.

Lellep J., Hein H. Optimal design of fiber-reinforced plastic cylindrical shells (in Russian). Problems of optimization of of plastic shells. Proc. Conf. Sewastopol, 07-09.09 1989, 59.

1988

Lellep J., Hein H. Large plastic deflections of rigid–plastic shallow spherical shells (in Russian), Tartu Riikl. Ülik. Toim. (Trans. Tartu State Univ.), 1988, 799, 37 – 51. 

1987

Lellep J., Hein H. Optimal design of fiber–reinforced plastic cylindrical shells (in Russian), Tartu Riikl. Ülik. Toim. (Trans. Tartu State Univ.), 1987, 772, 96 – 109.