... methods or replace it. A case study is presented on a Fitness-for-Service (FFS) assessment of TWs left in-service following a change to operating conditions subjecting the TWs to inline resonance. The outcome of the FFS depends on the assumed damping factor which can be accurately determined...

... Abstract It is shown how measurements of the decaying response of a vibrating system, following an initial disturbance, can be analysed to extract natural frequency and damping properties. Typically, such data contains a superposition of many vibration modes. By using filtering...

... vortex fatigue failure vibrations damping ASME PTC 19.3 TW in-situ measurement FATIGUE ASSESSMENT OF INSTALLED THERMOWELLS: FATIGUE STRESS EVALUATION BASED ON IN-SITU VIBRATION MEASUREMENTS AND DEDICATED MODELS Pieter van Beek Dept. of Heat Transfer & Fluid Dynamics, TNO Delft, the Netherlands...

... Proceedings of PVP2005 Proceedings of PVP2005 1 Copyright © 2005 by ASME dynamics of the tube-fluid system due to the pop-out phenomenon. The model takes into consideration the effects of the coupling between fluids and structure as well as the inherent system damping on the response. Through...

... pattern A with unsteady vortexes, the flow pattern B with single swirl and a vortex, and the flow pattern C with twin swirls. The flow pattern changes from A to B or C with increasing the exciting amplitude. The damping ratio with the bulkhead is much larger than that without the bulkhead. The damping...