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Engineering publications

Doctoral thesis

Journal publications

  • Kõrgesaar M, Ehlers S. An Assessment Procedure of the Crashworthiness of an LNG Tanker Side Structure. Ship Technology Research Schiffstechnik VOL. 57 / NO. 1 January 2010
  • Ehlers S. A procedure to optimize ship side structures for crashworthiness. Journal of Engineering for the Maritime Environment 2009. doi:10.1243/14750902JEME179.
  • Ehlers S. Strain and stress relation until fracture for finite element simulations of a thin circular plate. Thin-Walled Structures 2009, doi: 10.1016/ j.tws.2009.08.004.
  • Ehlers S, Varsta P. Strain and stress relation for non-linear finite element simulations. Thin-Walled Structures 2009; 47; 1203-1217.
  • Klanac, A., Ehlers, S., Jelovica, J.: Optimization of crashworthy marine structures. Marine Structures, Volume 22, Issue 4, October 2009, Pages 670-690.
  • Klanac, A., Jelovica, J.: Vectorization and constraint grouping to enhance optimization of marine structures, Marine Structures, Vol. 22, No. 2, 2009, 225-245.
  • Ehlers S, Broekhuijsen J, Alsos HS, Biehl F, Tabri K. Simulating the collision response of ship side structures: A failure criteria benchmark study. Int Ship Progress 2008; 55: 127-144.
  • Romanoff, J., Klanac, A.: Design Optimization of Steel Sandwich Hoistable Car Decks Applying Homogenized Plate Theory, J. Ship Production, Vol. 24, No. 2, 2008, p. 108-115.
  • Klanac, A., Jelovica, J.: Vectorization in the structural optimization of a fast ferry, Brodogradnja-Shipbuilding, Vol. 58, No. 1, 2007, p. 11-17.
  • Klanac, A., Jalonen, R., Varsta, P.: Multi-stakeholder decision-making in the risk-based design of a RO-PAX double bottom for grounding, Journal of Engineering for the Maritime Environment, Vol 221, No. 1, 2007, p. 1-15.
  • Romanoff, J., Varsta, P. Klanac, A.: Stress Analysis of Homogenized Web-core Sandwich Beams, Composite Structures, Vol. 79, No. 3, 2007, p. 411–422.
  • Kujala, P., Klanac, A.: Steel Sandwich Panels in Marine Applications, Brodogradnja-Shipbuilding, Vol. 56, No. 4, 2005, p. 305-14.
  • Nekic, A, Klanac, A., Fafandjel, N.: Production Plan and Costs of the Y- and Corrugated-Core Crashworthy Side Structures, Engineering Review, 2004

Conference proceedings

  • Ehlers, S., Polic, D., Klanac, A., Schröder, M. (2011) An investigation of a Suezmax tanker grounding accident, 3rd International Conference on Maritime Structure - MARSTRUCT, Hamburg, Germany
  • Bralic, S., Frank, D., Klanac, A., Cace, B. (2011) CAFE: An Innovative Multi-User System for Rapid Generation of Ship Concepts, COMPIT Conference, Berlin, Germany
  • Varsta P, Ehlers S, Klanac A, Tabri K. Collision and Grounding of Ship Structures. In Advanced Ship Design for Pollution Prevention, 2010, 191-204
  • Ehlers S. Optimization for Crashworthiness. 10th Finnisch Mechanics Days. 3 – 4 December 2009. Jyväskylä, Finland.
  • Ehlers S, Klanac A, Remes H, Kapuścik K, Naar H, Andric J, Zanic V, Grgic M, Pircalabu, E, Bair F. The IMPROVEd chemical tanker. IMPROVE- Conference, Dubrovnik, Kroatien 17-19. Sept. 2009.
  • Ehlers S, Kapuścik K, Khalid H, Turan O. The basic design, performance and stability of the IMPROVEd chemical tanker. IMPROVE- Conference, Dubrovnik, Kroatien 17-19. Sept. 2009.
  • Remes H, Klanac A, Varsta P, Ehlers S. ConStruct – Platform for Conceptual Structural Design. IMPROVE- Conference, Dubrovnik, Kroatien 17-19. Sept. 2009.
  • Alan Klanac and Darko Frank. Visualization of ship design process applying group decision-making. IMDC 2009. 10th International Marine Design Conference. Trondheim Vol.2.
  • Frank D. Klanac A. Mattila M. Elements of Design Tool Integration for Concurrent Ship Design: CATIA-NAPA integration. In proceedings COMPIT 2009, Budapest. Pages 454-460.
  • J. Jelovica & A. Klanac. Multi-objective optimization of ship structures: using guided search vs. conventional concurrent optimization. Proceedings MARSTRUCT 2009 Lisboa. Pages 447-457.
  • Ehlers, S., Klanac, A., and Korgesaar, M. A design procedure for structures against impact loading. STG yearbook, 2008  (Schiffbautechnische Gesellschaft, Hamburg)
  • Frank, D. Klanac, A. Bralic, S.: ng.zine - a new design system for naval architecture, In: Proc. SORTA, Pula, 2008.
  • Frank, D., Klanac, A., Bralic, S.: A concept for concurrent group design of Ships, In: Proc. COMPIT’08, Liege, 2008.
  • Klanac, A., Jelovica, J., Niemeläinen, M., Domagallo, S., Remes, H., Romanoff, J.: Omni-optimization of a tanker, In: Proc. COMPIT’08, Liege, 2008.
  • Rigo, P, Dundara, Dj. Guillaume-Combecave, J-L, Karczewicz, A, Klanac, A, Roland, F, Turan, O, Zanic, V, Amrane, A, Constantinescu, A. IMPROVE - Design of Improved and Competitive Products using an Integrated Decision Support System for Ship Production and Operation, In: Proc. COMPIT'08, Liege, 2008, p. 92-106
  • Ehlers S, Klanac A, Tabri K. Increased safety of a tanker and a RO-PAX vessel by implementing a novel sandwich structure. In: Proc Fourth Int Conf Collision and Grounding of Ships. Germany, 2007. p. 109-115.
  • Tabri K, Alsos H, Broekhuijsen J, Ehlers S. A benchmark study on ductile failure criteria for shell elements in multiaxial stress state. Advancements in Marine Structures 2007, pp 401-409.
  • Ehlers S, Tabri K, Schillo N, Ranta J. Implementation of a novel ship side structure into a tanker and a ropax vessel for increased crashworthiness. 6th European LS-DYNA Users’ Conference, Gothenburg, Sweden, 2007. p 4.111-4.120.
  • Romanoff J, Klanac A.: Design Optimization of a Steel Sandwich Hoistable Car-Decks Applying Homogenized Plate Theory, In: Proc 10th International Symposium on Practical Design of Ships and Other Floating Structures – PRADS. Houston, 2007.
  • Ehlers S, Klanac A, Tabri K.: Increased safety of a tanker and a RO-PAX vessel by implementing a novel sandwich structure. In: Proc fourth Int Conference on Collision and Grounding of Ships. Hamburg, 2007. p. 109-115.
  • Besnard, N., Codda, M., Ungaro, A., Toderan, C., Klanac, A., Pecot, F.: Benchmark on ship structural optimization, Advancements in Marine Structures, Guedes Soares & Das (eds), Proceedings of MARSTRUCT 2007, The 1st International Conference on Marine Structures, 12-14 March 2007, Glasgow, UK. p. 453-463 (Taylor & Francis: London)
  • Klanac, A. Jelovica, J.: A concept of omni-optimization for ship structural design, Advancements in Marine Structures, Guedes Soares & Das (eds), Proceedings of MARSTRUCT 2007, The 1st International Conference on Marine Structures, 12-14 March 2007, Glasgow, UK. p. 473-481 (Taylor & Francis: London)
  • Ehlers S. Design of steel sandwich panel joints with respect to fatigue life. Yearbook of the Schiffbautechnischen Gesellschaft 2006, Band 98, ISBN 3-540-27423-5.
  • Klanac, A., Jelovica, J.: Vectorization in the structural optimization of a fast ferry, 17th Symposium on Theory and Practice in Shipbuilding - SORTA, Opatija, 2006.
  • Klanac, A., Tabri, K., Ehlers, S., Nekic, A.: Multi-Attribute Design of Crashworthy Structures in the Bi-Stakeholder Environment, International Marine Design Conference – IMDC, Ann Arbor, 2006, accepted for publication.
  • Klanac A, Ehlers S, Tabri K, Rudan S, Broekhuijsen J. Qualitative design assessment of crashworthy structures. In: Proc Int Maritime Association of Mediterranean, Portugal, 2005. p. 461-469.
  • Klanac A, Ehlers S, Tabri K. Analysis of crashworthy structures. Maritime Research News 2005, Vol. 20.
  • Ehlers S. Design of steel sandwich panel joints. Ship structural design seminar, Espoo, Finland 2005.
  • Nekic, A., Klanac, A.: Manufacturing Crashworthy Side Structures: Production Plan and Costs. First Conference on Marine Technology, in memoriam Z. Winkler, Rijeka, 2005, in print.
  • Klanac, A., Ehlers, S., Tabri, K., Rudan, S., Broekhuijsen, J. Qualitative design assessment of crashworthy structures, Proceedings of International Maritime Association of Mediterranean - IMAM, Lisboa 2005, p. 461-9.
  • Kujala P, Romanoff J, Tabri K, Ehlers S. All Steel Sandwich Panels – Design Challenges for Practical Applications on Ships. 9th Symposium on Practical Design of Ships and Other Floating Structures, Lübeck-Travemünde, Deutschland 2004.
  • Klanac, A.: A Multicriteria Redesign of the Midship Section of an Intermodal RO-RO Ship, 16th Symposium on Theory and Practice in Shipbuilding - SORTA, Plitvice, 2004.
  • Klanac, A., Kujala, P.: Optimal Design of Steel Sandwich Panel Applications in Ships, 9th International Symposium on Practical Design of Ships and Other Floating Structures - PRADS, Travemuende – Luebeck, Sept. 2004.
  • Kujala, P., Klanac, A.: Plate Analysis of All Steel Sandwich Panels Under Uniform Pressure Load, Proceeding of the 15th Symposium on theory and practice in shipbuilding - SORTA, Trogir, Croatia, Nov. 2002.
  • Kujala, P., Klanac, A.: Analytical and Numerical Analyses of Non – Symmetrical All Steel Sandwich Panels Under Uniform Pressure Load, Proceedings of the 7th Design Conference, Dubrovnik, May 2002

Laboratory reports

  • Ehlers S. A thin circular plate under hemi-spherical punch; An experimental study of a plate subjected to a displacement controlled punch. Helsinki University of Technology, Department of Applied Mechanics, TKK-AM-7, 2009.
  • Ehlers S, Enquist B. Uni axial tensile necking of steel dog-bone specimens. Helsinki University of Technology, Ship Laboratory, M-303, 2007.
  • Romanoff, J., Klanac, A.: Design Formulations for Filled Structural Sandwich Panels, Report M-288, Helsinki University of Technology, Ship Laboratory, Espoo, 2004.
  • Klanac, A.: Bending of Steel Sandwich Panels Under Lateral Loading, Report M-285, Helsinki University of Technology, Ship Laboratory, Espoo, 2004