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Development of finite element model of shunting locomotive applicable for dynamic analyses

Dziewulski P., Szurgott P.

Journal of KONES

2014

Vol. 21, No. 4

95--102

The main aim of this study is to develop a finite element model of the hybrid-shunting locomotive. Considered locomotive is based on a popular shunting locomotive in Poland – SM42. All components above the locomotive frame could be modified in comparison to the original object, whereas a chassis was essentially unchanged. Such solution allows the operators freely configure components e.g. diesel engine, generator, cooling module, cab etc., according to their own requirements. Works on the FE model were focused on very accurate reflection of the locomotive frame since the planned dynamic analyses include crash tests. FE model of the frame has a fine mesh and it is considered as a deformable component. Other segments of the vehicle are simplified and treated as rigid bodies mostly. FE model was developed on the basis of the locomotive CAD model. It was decided to transform the CAD model of the frame into the FE one applying the midsurface procedure. Such approach is correct since the locomotive frame is made of a large number of steel elements in the form of sheet metal plates and sections welded together. Altair Hyper Mesh software was used in the FE model developing process. Appropriate connections between respective components of the model e.g. wheelset – bogie, bogie – locomotive frame, were applied. Finally, the locomotive FE model consists of about 116 thousands of finite shell and solid elements and about 125 thousands of nodes. Dynamic analyses of the locomotive FE model will be carried out using LS-DYNA computer code.

Test optymalizacji ażurowej konstrukcji cylindrycznej z wykorzystaniem narzędzi LS-Opt i HyperMesh

Mazurkiewicz Ł., Małachowski J.

Mechanik

2010

R. 83, nr 1

68-68

Stent kardiochirurgiczny jest to niewielka wewnątrz naczyniowa konstrukcja cylindryczna służąca do leczenia zmienionych miażdżycowo naczyń krwionośnych. Głównym problemem podczas projektowania takiego typu sprzętu medycznego jest dobranie optymalnej geometrii wyrobu tak, aby pojawiające się odkształcenia i naprężenia były jak najmniejsze. W wyniku przeprowadzenia procedury optymalizacji otrzymano optymalną wartość zmiennej kształtu, co skutkowało obniżeniem wartości odkształceń plastycznych o ok. 20% w porównaniu z konstrukcją bazową.

Medical stent is a slender tube inserted inside a blood vessel to provide support for atherosclerosisly changed arteries. The main design problem with this type of medical equipment is to find the optimum device geometry in order to minimize strain and stress, which appear in a structure. Optimization procedure provides the optimum value of shape variable, which has resulted in 20% reduction of the plastic strain in comparison with the base design.