Papers by Keyword: Dynamical Modelling

Abstract: In the human body, vibrations are generated by internal or external sources. Because of the soft tissues, bones, joints, internal organs and also because of its anatomical particularities components in general, the human body is a complex vibratory system. The vibrations from external sources can be transmitted to the human body when it is positioned in different manners: standing, sitting, recumbent and moving or at work. The effect of vibration on the human body is related to the natural frequency of affected parts in the human body. This paper studies the dynamic characteristics of a human body system in a vibration environment and sets limits to which the balance is affected. The main result is a multi degrees of freedom lumped parameter model. The model provides an analytical tool for human body dynamics research. The relative displacements of human parts are evaluated, which can be a basis for the assessment of vibration risk and setting limits for keeping human balance.

Abstract: The introduced cutting model uses the widely applied mechanical-dynamical differential Lagrange model together with one of the most popular experimental force model (Kienzle-Victor model) in order to provide the more accurate demonstration and simulation of cutting processes. To increase the reliability of the results the authors considered as much parameters and as complex chip geometry as the calculations and processing made it possible. In this paper the sophisticated model of milling operation was the aim of the authors. The simulation results show good equivalency with the measured real cutting experiments. In spite of the complexity of the equations the rapid development in the informatics (hardware and software tools) helped the handling and quick calculation of the equations in this type of models.