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Application of genetic algorithms to the evaluation of the fundamental frequency of stiffened plates

100%

Iwaniec M.

Archives of Acoustics

2006

tom Vol. 31, No. 3

335-346

In this paper, the analytical and numerical procedures for multi-stiffened plate free vibration analysis are presented. The plate and stiffeners are treated as an assembled plate and stiffening elements. The energy analysis leads to the nonlinear formulation of the non-dimensional frequency function formulated for a group of similar palates. The generalized optimization problem was solved by the use of the Nelder-Mead and genetic algorithms. The verification of the results obtained was performed on FEM models created for the same examples of the physical representation of the considered group of stiffened plates. This paper also aims the study of the influence of geometrical and material parameters of the stiffeners as well as the plate proportions on the fundamental frequency.

Experimental and numerical investigations of ultimate strength of imperfect stiffened plates of different slenderness

100%

Woloszyk K. , Garbatov Y. , Kowalski J. , Samson L.

Polish Maritime Research

2020

tom nr 4

120--129

The objective of this study is to analyse the behaviour of compressed stiffened plates of different slenderness using experimental and numerical methods. The presented results are part of a long-term project to investigate the ultimate strength of geometrically imperfect structures subjected to different degradation phenomena, including corrosion degradation and locked cracks. Several specimens were subjected to a uniaxial compressive force, and the most important quantities related to the structural behaviour were captured and analysed. A finite element model, accounting for material and geometrical nonlinearities and initial geometrical imperfections, was developed using the commercial software ANSYS. The residual welding-induced stresses were measured in the middle cross-section for two specimens. The initial imperfection was identified by employing a close-range photogrammetry approach. It was concluded that the numerical analyses, based on the finite element model, predict the ultimate strength of stiffened plates accurately, although some deviations were also observed. The detailed analysis with the indication of possible uncertainty is presented, and several conclusions are derived.

The influence of constructional parameters on stiffened plates sound radiation

100%

Iwaniec M.

Archives of Acoustics

2005

tom Vol. 30, No. 4

483-494

This work concerns the method of the plate parameter selection and the choice of the stiffening set, assuming the minimization or maximization of the energy stored or radiated by a stiffened plate as a criterion. The energy balance equations based on the SEA method were used in order to quickly evaluate the energy flow as a function of chosen constructional parameters. Calculations of mechano-acoustic energy flow were performed in AutoSEA and Matlab environment.

Analiza MES płyty prostokątnej usztywnionej profilami zamkniętymi

75%

Dębski H. , Jonak J.

Górnictwo Odkrywkowe

2006

tom R. 48, nr 5-6

122-125

Rozważa się stateczność oraz stan deformacji zakrytycznej prostokątnej płyty cienkiej usztywnionej profilami zamkniętymi, poddanej działaniu obciążenia stycznego. Badania obejmowały obliczenia teoretyczne oraz analizę numeryczną konstrukcji z wykorzystaniem metody elementów skończonych. Równolegle do wykonywanych obliczeń przeprowadzono badania eksperymentalne konstrukcji, stanowiące formę bieżącej weryfikacji modelu MES.

This paper presents buckling and postbuckling deformation state of rectangular plate which are stiffened closed profiles. Researches connected theoretical calculations and numerical FEM analysis of this construction. In order verification of numerical model experimental tests were carried out.

On a certain method of stiffened plates modeling

75%

Buchaniec D.

Electronic Journal of Polish Agricultural Universities. Series Civil Engineering

2006

tom 09

nr 1

A method of stiffened plates modeling is being described in the paper. The method consists on dividing a construction into plate elements and stiffeners. Each of these elements is calculated independently, taking unknown forces of co-operation between these elements into consideration. These forces are determined from the conditions of the continuity of displacements on the common surfaces of the plate elements and stiffeners. The plates under consideration are made of ferroconcrete and the stiffeners are on the one side of the plate.