Browsing by Author "ghazavim@modares.ac.ir"

Now showing items 1-2 of 2

    • Dynamic analysis of drillstring with FEM by considering wellbore-drillstring contact 

      Maziar, Mohammadzadeh; Mohammadreza, Ghazavi; Mohammad, Sahebkar (Universiti Malaysia Perlis (UniMAP)Pusat Pengajian Kejuruteraan Mekatronik, 2012-02-27)
      In this research,the finite element method (FEM) is applied to analyze the drillstring vibration. The contact between different parts of the drillstring and the borehole wall has been considered which was ignored by ...

    • The effect of row of blades on self-excited instability of rotating systems 

      Mohammad-Reza, Ghazavi; Asghar, Najafi (Universiti Malaysia Perlis (UniMAP)Pusat Pengajian Kejuruteraan Mekatronik, 2012-02-27)
      The self-excited instability, which is common in rotating systems, is investigated in a bladed disk system. The instability happens due to internal damping and causes asynchronous vibrations. A bladed disk model of the ...