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J2-8170: Nonlinear dynamics of spatial frame structures with enforced kinematic compatibility for advanced industrial applications

Project Title Nonlinear dynamics of spatial frame structures with enforced kinematic compatibility for advanced industrial applications
Project team: prof. dr. Igor Planinc, doc. dr. Eva Zupan, prof. dr. Goran Turk, prof. dr. Dejan Zupan, doc. dr. Matija Gams, dr. Miha Kramar, dr. Andrej Anžlin
Duration: 36 months

May 1st, 2017 – April 31st,  2020

Project Code: J2-8170
Lead partner: ZAG, Slovenian National Building Institute
Project leader: Prof. Igor Planinc, PhD (UL FGG)
Source of finance:
Key words: non-linear mechanics, dynamics, numerical models, frame-like structures


During the project, we will develop numerical methods, algorithms, and computer software for dynamics of flexible multibody systems in various advanced engineering applications. The engineering applications under consideration stem from our cooperation and cooperation of our partners with industry. We are focused on problems, in which the flexible bodies can be successfully modelled with geometrically exact Cosserat rods, such as cables, ropes, wires, belts, trusses, columns and girders. The nonlinear constitutive models and composite structure of this important engineering objects will be taken into account. A special attention will be given to modelling of coupled behaviour of moving bodies on deformable ground.

Main goals

We will prepare advanced computer software for accurate, efficient and robust dynamic analysis of flexible slender structures with realistic description of material and geometrical nonlinearites. With such numerical tools we will be able of better prediction of material changes and possible damage of the structure. The efficiency of the mode in high-frequency range will also allow better reduction of unpleasant acoustic disturbances in virtual product development process. Together with the development of numerical methods the experimental work will be carried out..

Project work packages

The realisation of the project in the three-year period (36 months) is planned in following phases:
Phase 1: study of the relevant literature; planning the first set of experiments (months 1-2);
Phase 2: first set of experiments; validation of existing numerical models preparation of novel formulations (months 3-6);
Phase 3: modelling of very flexible structures (cables, hoses, ropes); experiments on these structures (months 7-12);
Phase 4: modelling the material nonlinearity and composite structure; validations; experiments with impact loads (months 13-18);
Phase 5: modelling of impact loads; validation with experiments of phase 4, modelling of moving contact (months 19-24)
Phase 6: modelling of coupled dynamics of moving mass on deformable structure; verification and validation (months 25-30);
Phase 7: technical reports and scientific papers (months 31-36).