Browsing by Author "Chen, Haobin"
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- ItemOpen AccessIn-Situ Modal Response Characterization of Pipe-Structures Through Reynolds Number Variation(2018-09-13) Chen, Haobin; Hugo, Ronald J.; Park, Simon S.; Wood, David H.In this investigation, an in-situ method of system excitation is explored experimentally. The modal characteristics of externally-supported pipe structures are investigated by varying the flow Reynolds number (Red) with hydrodynamic pressure fluctuations due to fully developed turbulent pipe-flow providing a varying excitation source on the internal pipe wall. During experiments, time series records of single-point fluctuating wall pressure and multi-point wall vibrations are collected. Power spectral density functions of both wall pressure fluctuation and wall vibration are computed at each discrete Reynolds number. Visualization of the computed power spectral density functions with flow Reynolds number are then used for system characterization. A comparative analysis of the data sets collected for both acrylic and ABS pipe show that the pressure spectra are similar, while the vibration spectra change significantly. Pressure spectra reveal a character whereby the magnitude of the spectra increase with increasing Reynolds number. A comparison of in-situ results to those obtained using traditional impact response tests show that the vibration spectra collected through Reynolds number variation successfully capture the modal characteristics of the pipe-structure. Both acoustic analysis to determine the vibration source and preliminary health diagnostics investigations for both loss-of-fluid and loss-of-material events are performed.
- ItemEmbargoPipeline Vibration Characterization and Monitoring System Development(2023-06) Chen, Haobin; Hugo, Ronald; Park, Simon; Wong, Ron Chik-Kwong; Tiamiyu, Ahmed Alade; Vyas, Rushi; Hemmati, ArmanPipeline systems are used for the transportation of energy over long distances. Pipeline systems play an important role both now and in the future, given that carbon-based energy products will slowly be replaced by carbon-neutral energy products. Structural Health Monitoring (SHM) utilizing operational vibroacoustic signals has become increasingly popular due to both its non-intrusive nature and its ability to provide continuous monitoring. To date, challenges have prevented widespread application to varying environments and flow conditions. The overall objective of this research is to experimentally and numerically investigate the operational vibration signal from pipelines under various boundary conditions (both above and below ground) and flow conditions (both single and multiphase) for the development of novel monitoring systems. In this thesis, several works have been performed: flow-induced vibration of a buried steel pipe structure due to internal flow turbulence; leak detection of small leaks in low-pressure pipelines; external disturbance detection and classification and flow pattern identification.