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Soft modelling of the shaping of metal profiles in rapid tube hydroforming technology

Sadłowska Hanna, Kochański Andrzej

Computer Methods in Materials Science

2022

Vol. 22, No. 4

201--210

The paper presents an approach to the impact of process parameters in innovative RTH (Rapid Tube Hydroforming) technology for shaping closed metal profiles in flexible and deformable dies. In order to implement the assumed deformation of the deformed profile, the RTH technology requires the monitoring and control of numerous technological parameters, including geometric, material, and technological variables. The paper proposes a two-stage research procedure considering hard modelling (constitutive) and soft modelling (data-driven). Due to the complexity of the technological process, it was required to develop a numerical finite element method FEM model focused on obtaining the adequate profile deformation measured by the ellipsoidality of the cylindrical profile. Based on the results of the numerical experiments, a preliminary soft mathematical model using ANN was developed. Analysing the soft model results, several statistical hypotheses were made and verified to investigate the significance of selected process parameters. Thanks to this, it was possible to select the most important process parameters, i.e., the properties of moulding sands used for RTH dies: the angle of internal friction and cohesion.

Analiza poziomu zrównoważonego rozwoju województw Polski w 2010 roku

Roszkowska E., Misiewicz E. I., Karwowska R.

Ekonomia i Środowisko

2014

nr 2

168--190

Celem artykułu jest ocena poziomu zrównoważonego rozwoju (ZR) województw Polski w 2010 roku w rozbiciu na ład gospodarczy, społeczny oraz środowiskowy z wykorzystaniem dwóch metod: modelowania miękkiego oraz metody TOPSIS na podstawie odpowiednio dobranych agregatów wskaźników indywidualnych.

The aim of this paper is to analyze the level of sustainable development (SD) in voivodeships of Poland in the year 2010. The level of SD of voivodeships in Poland was estimated in three dimensions: economic, social and environmental with two methods: soft modeling and TOPSIS. On the basis of sustainable development theory, a soft model has been built to show relations between economy, society and environment as well as their impact on sustainable development. The analysis of results shows optimal relations between the level of economic, social and environmental development, which will allow future generations to make use of existing resources. Application of the soft modeling and TOPSIS method had enabled classification of regions in regard of economy level, society and environment so as the comparison of the results of grouping achieved using this methods. The study was completed with data of Polish Statistic Office collected in 2010.