THE EFFECTS OF COUPLING MISALIGNMENT ON VIBRATION OF ROTOR BEARING SYSTEM
Published In: 6TH INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL, STRUCTURAL AND MECHANICAL ENGINEERING
Author(s): SEONG-WOOK HONG , SUN-WOONG KWON , VAN-CANH TONG , EUI-WOOK JEONG
Abstract: Misalignment is one of the most influential factors that affect the vibration of a rotor bearing system. This paper presented a combined analytical and experimental approach to investigate the effect of the coupling misalignment on the vibration behavior of a rotor supported by tapered roller bearings. First, a theoretical model was developed to predict the vibration in the rotor system subjected to angular misalignment in the flexible coupling. Then experimental measurements were made from an instrumented test-rig to verify the model. Finally, extended simulations were performed to investigate the effect of misaligned amplitude, rotational speed disk position, bearings distance, and arrangement on the vibration behavior of the rotor. Simulation results showed that the coupling misalignment leads to vibration with multiple harmonics of rotational speed, and that misaligned coupling introduced anisotropic nature in vertical and horizontal vibration responses of the rotor.
- Publication Date: 26-Feb-2017
- DOI: 10.15224/978-1-63248-118-4-31
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CFD MODELING FOR THERMAL PERFORMANCE OF CLOSED LOOP PULSATING HEAT PIPE IN BOTTOM HEATED MODE
Published In: 6TH INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL, STRUCTURAL AND MECHANICAL ENGINEERING
Author(s): ASHUTOSH GUPTA , AJIT K PARWANI
Abstract: In this research work a computational model for closed loop pulsating heat pipe (CLPHP) has been developed in order to study its two phase flow process and predict its thermal performance. The pulsating heat pipe of 1.3mm internal diameter in vertical bottom heat mode was simulated with unsteady model. Water was taken as working fluid. Volume of fluid model (VOF) in FLUENT was selected for multiphase modelling, also continuum surface force (CSF) model was considered for effects of surface tension. The simulation with unsteady model was successful in reproducing the two phase flow process in CLPHP and oscillation caused by the pressure difference along with the startup characteristics. During the working of CLPHP, lowest thermal resistance of 0.295 K/W was achieved. The simulation result obtained is consistent with the experimental results at the same condition.
- Publication Date: 26-Feb-2017
- DOI: 10.15224/978-1-63248-118-4-33
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- Downloads: 0