On the Irreversibility in Mechanical Systems Using a New Macroscopic Energy Structure Modeling


  • Saeed Shahsavari Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran
  • Mehran Moradi Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran
  • Morteza Esmaeilpour Department of Civil Engineering, Geo and Environmental Sciences, Karlsruhe Institute of Technology, Kralsruhe, Germany




Mechanical Systems; Energy Structure equation; Irreversibility; work bound; Viscoelasticity


This paper presents a macroscopic applied innovate modeling to study the performance effects of the second law of thermodynamics on the mechanical systems. To investigate the irreversibility in mechanical systems, the energy structure of the system can be studied. Some energy components relate to the reversible processes and remaining relate to the irreversible process. Exiting models are based on the studying sub structures and therefore, need a large volume of the calculations. In this paper, at first, using a macroscopic quasi-statistical approach, a new energy structure equation is extracted and by examining it’s variation in the different paths, the irreversible components as well as their structures are studied. Using the kinematic theories of dissipated energy, it can be concluded that the extracted equations have the same base as the different formulations of the second law of thermodynamics. Finally, as a mechanical system example with the possibility of irreversibility in the possible performed processes, the extracted equations are developed for viscoelasticity problems. And also the matching of the results with expected results is shown.


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How to Cite

Shahsavari, S., Mehran Moradi, & Esmaeilpour, M. (2020). On the Irreversibility in Mechanical Systems Using a New Macroscopic Energy Structure Modeling. Asian Journal of Applied Sciences, 8(6). https://doi.org/10.24203/ajas.v8i6.6473