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Wednesday, July 10 • 11:30 - 11:50
ESTIMATE OF THE FATIGUE LIFE OF THE DRIVING-MOTOR SHAFT FROM TORSIONAL VIBRATION MEASUREMENT AND THE LINEAR DAMAGE SUMMATION LAW IN HYDROGEN RECIPROCATING COMPRESSOR

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This paper investigates an early break event of a driving-motor shaft coupled with a hydrogen reciprocating compressor. The latter is utilized in oil refinery plant where shaft-break event can be considered as high risk and should be avoided. Torsional vibration measurements were conducted where an extraordinary large start-up transient together with steady-state 100%-loading torque of regular values were observed. Criteria consisting of US MIL STD 167-2 and Soderberg criteria were adopted to examine the fatigue stability of both the transient and steady-state torsional loading conditions. It is found that the start-up transient event fails in the fatigue stability analysis check while the 100% loading case can be considered safe. Cumulative fatigue analysis using stress-life relationship, linear summation law and rainflow cycle-counting method has been per-formed to estimate the fatigue life of the driving-motor shaft. The estimated life of the driving-motor shaft matches well with the real life provided by the oil refinery company. Weak properties of shaft material together with the stress concentration effect caused by a circumferential groove mark are believed to directly cause the relatively early shaft break.

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avatar for Mohammad Rafiee

Mohammad Rafiee

Postdoctoral Fellow, Polytechnique Montréal
Mohammad Rafiee received his Ph.D. degree in Mechanical Engineering from the University of Ottawa in 2018. Currently, he is a Postdoctoral Fellow at Polytechnique Montreal in Canada. His research interests are primarily focused on the development of advanced composite materials, smart... Read More →

Authors

Wednesday July 10, 2019 11:30 - 11:50 EDT
St-Laurent 8
  T07 Struct. dyn. & nonlin. vib., RS05 Fatig fractr & jnt interf

Attendees (4)