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This work addresses the modelling of a system using Modelica language and the Dymola software tool. Dymola is a modelling and simulation environment that uses the open Modelica language to map hardware components of physical systems directly into software components. Therefore, this modelling language allows the user to model a system in a physical form, rather than a mathematical fashion, through the use of general equations, objects, and links. This paper as an informative character about a tool for the development of mechatronic systems. The topics covered here are part of a more extensive modelling and simulation work on the dynamics of mechanical systems, within the scope of an Integrated Master in Mechanical Engineering. This study was carried out based on the comparison between pneumatic and hydraulic models of the same system. Therefore, it was modeled a system used in backhoe loaders that can be operated either using a hydraulic or a pneumatic cylinder. The activity focuses, essentially, on the analysis of parameters that describe the behaviour of the system, emphasizing the position, velocity, acceleration and loads observed in both cylinders. The goal is to introduce the reader to the Dymola environment and Modelica language by addressing the modelling of a system. This study also pretends to identify significant differences regarding the behaviour performance of the pneumatic and hydraulic approaches to model the selected system, and the causes that lead to such differences.

ANALYSIS AND COMPARISON OF A HYDRAULIC AND PNEUMATIC SYSTEM USING THE DYMOLA SOFTWARE