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Analysis of Bending Response of Tubes Conveying Fluid by the Method of Characteristics

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 احمد عبدلله حسن الراجحي 10/05/2018 08:17:37
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The present work deals with the dynamical response of tubes conveying flowing fluid and subjected to external impact loading using the method of characteristics as an approach of solution. Tubes has many important applications such as fuel lines, hydraulic lines, heat exchangers and transportation of fluids according to the demand. The dynamical analysis of tubes conveying fluid is of important necessity to insure safe operation. The work is focused on the investigation of the effect of fluid flow on the bending response of a cantilever pipe subjected to lateral impact force. The governing equation is derived according to Newton’s second law. The approach of solution depends on the wave propagation in one-dimensional structural element using the Method of characteristics. The LabVIEW software was used to analyze the signals picked up from the accelerometers, impact hammer and strain gages that used in the experiments. A calibrated ultrasonic flow meter was used to measure the flow velocity. The results show that increasing the flow velocity results in reducing the amplitude of bending moment response to the impact lateral force by about 9%. The results also show that the time required to attenuate the amplitude of the bending moment response by 90% is about 48%. These effects are due to the Coriolis Effect which depends on the flow velocity of fluid and lateral velocity of tube. This study concludes that the velocity of fluid flow has an important influence on the dynamic response of tubes conveying fluid. Also we found that the method of characteristics (MOC) is found to be a suitable approach for idealizing the wave propagation in fluid-structure interaction elements.

  • وصف الــ Tags لهذا الموضوع
  • Bending response, dynamics of tubes, Method of characteristics, Wave propagation

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