Nonlinearity and spectrum analysis of drill strings with component mass unbalance Academic Article uri icon


  • This paper analyses the non linear properties exhibited by a drill string system under various un balanced mass conditions. The drill string is affected by continuous friction in the form of drill bit and well bore hole interactions. This paper proves the origin of limit cycling and increase of non linearity with increase in speed of the drilling in the presence of friction. The spectrum of the frequency response is also studied to detect the presence of vibration abnormalities arising during the drilling process.

published proceedings

  • World Academy of Science, Engineering and Technology

author list (cited authors)

  • Abdul Majeed, F., Karki, H., Abdel Magid, Y., & Karkoub, M.

complete list of authors

  • Abdul Majeed, F||Karki, H||Abdel Magid, Y||Karkoub, M

publication date

  • January 2011