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Torsional Vibration Modeling and Measurement in Single Rotor Machinery for Fault Diagnosis

Hosseini, Alireza | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41663 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Behzad, Mahdi; Mahdigholi, Hamid
  7. Abstract:
  8. Experimental investigation of drillstring dynamics is essential to complete the theoretical studies and to alleviate complexity of such dynamic models. Vibration is one of the most effective parameter affecting drilling operation. Most of the experimental setups are looking for drilling mud tests, operational characteristics of bit under several bad condition and bit mud stone interaction in drilling operation and there are few setups to study vibration of the drilling setups. In this project a test rig has been introduce which is a scale of a real industrial drilling rig by the factor of 10300. Then based on the field studies of drilling failures in Iranian oil drilling rig , a crack has been introduced to the pipe of drilling and the effect growth of the crack on the natural frequency of the system has been studied. The crack has been modelled by the use of Teflon. After observing the effectiveness of analysis of torsional behavior of the drillstring in fault detection, then one should go further on and study the effect of crack propagation on the torque or the current of the motor. Then this alert could be used in drilling rigs and the drilling process could be shut down before a whole failure
  9. Keywords:
  10. Torsional Vibration ; Drill String ; Design and Construction ; Experimental Model ; Fault Diagnosis ; String Failure ; Frequency Analysis

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