NDLI: Forced Response Analysis of Steam Turbine Inlet Flow Control Valves

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Chakrabarti, Suryarghya Potdar, Yogesh Baik, Sanghum Welch, David Forte, Guido
Copyright Year	2014
Abstract	This work presents a comparison of two forced response methodologies implemented in commercial finite element software Ansys for describing the dynamic structural response of a steam turbine combined stop and control valve assembly in realistic operation conditions. The first method employs one-way coupling where the pressure field of a selected acoustic mode from an acoustic modal analysis on the valve cavity is scaled based on a pressure probe measurement and mapped onto the structure followed by a harmonic forced response analysis at the structure natural frequency. This method is called the decoupled model — it is fast and conservative as it assumes the acoustic and the structure modes to coincide providing a worst-case forced response estimate. The second method employs two-way coupling between acoustics and structure vibration. It takes five to ten times longer to run than the decoupled model because of the presence of non-symmetric system matrices and must be run multiple times with inputs spanning the operating condition range. However, the coupled model provides the opportunity for a more optimal design as it does not assume the acoustic and structure modes to line up. For the valve geometry studied in this work the effect of two-way coupling seems significant in some conditions where it can cause changes of up to 50% in the forced response.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791845776
DOI	10.1115/GT2014-27313
Volume Number	Volume 7B: Structures and Dynamics
Conference Proceedings	ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2014-06-16
Publisher Place	Düsseldorf, Germany
Access Restriction	Subscribed
Subject Keyword	Vibration Flow control valves Modal analysis Computer software Valves Acoustics Steam turbines Pressure Design Geometry Cavities Finite element analysis Manufacturing Probes
Content Type	Text
Resource Type	Article

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