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Vibration Analysis of Screw Compressor

Gholami, Mohammad | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55112 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Behzad, Mehdi
  7. Abstract:
  8. Screw compressors are rotary positive displacement compressors that utilize a pair of helical lobed rotors in a casing. Part 3 of ISO 10816 does not include Positive displacement compressors. VDI 3836 has more vibration amplitude limitations for this compressor than industrial machines under ISO 10816-3. The screw compressor has no valves; therefore, the location of the suction and discharge ports determines the compressor cycle. This study focuses on the condition monitoring through vibration analysis of screw compressors. The purpose of this study is to investigate the reason for excluding of screw compressors by ISO standard and also to explain the vibration dependence of these compressors on changes in inlet pressure, outlet pressure and discharge port shape. In this research, these compressors are compared with industrial machines that are under the standard of ISO 10816-3 and Also a model is developed for these compressors to justify their dependence on the applied dynamic load. In this model, first the forces and torques applied to the rotor of this compressor are calculated. These forces are applied to the dynamic model and the vibrations of this model are investigated. Two types of screw compressors experimentally measured. In experimental measurements, opening and closing the outlet valve causes different pressures at discharge. The consistency of the results of both dynamic models and experimental measurements shows well that the compressor operation in the design pressure ratio has the minimum vibration.
  9. Keywords:
  10. Screw Compressor ; Vibration ; ISO 10816-3 Standard ; VDI 3836 Standard ; Vibrational Analysis