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Application of Simulation Based Reliability Analysis on the Dimensioning of Viscous Dampers GERB

[+] Author Affiliations
Ladislav Pecinka, Miroslav Svrcek

Nuclear Research Institute Rez plc, Rez, Czech Republic

Petr Zeman

Seismic and Dynamic Consulting, Pilsen, Czech Republic

Karl-Heinz Reinsch

GERB Vibration Control Systems, Berlin, Germany

Paper No. PVP2009-77301, pp. 349-353; 5 pages
doi:10.1115/PVP2009-77301
From:
  • ASME 2009 Pressure Vessels and Piping Conference
  • Volume 8: Seismic Engineering
  • Prague, Czech Republic, July 26–30, 2009
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4371-0 | eISBN: 978-0-7918-3854-9
  • Copyright © 2009 by ASME

abstract

GERB pipework dampers are highly effective viscous – elastic elements applied in many conventional and nuclear power plants. The best approximation for the seismic analyses of safety related pipeworks is the application of double Maxwell model represented by spring stiffnesses k1 , k2 and damping coefficients b1 , b2 . These parameters represent damper capacity CN . Each damper is designed and manufactured for given operating temperature t0 and experimentally obtained curves of pseudostiffnesses and damping coefficients as the function of frequency in the range of 〈0; 35〉 Hz. Two parameters influence reliability of damper under seismic event: Overloading of nominal capacity in kN and conservation of minimal gap between piston and damper housing. The probabilities of exceeding of related allowable values may be assessed using Simulation Based Reliability Analysis. The needed input parameters are capacity and actual loadings and displacement of a piston in horizontal direction. General theory and numerical example are presented.

Copyright © 2009 by ASME

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