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Keywords: damping
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Journal Articles
Article Type: Research-Article
J. Pressure Vessel Technol. February 2019, 141(1): 010907.
Paper No: PVT-17-1222
Published Online: December 14, 2018
...Akira Maekawa; Tsuneo Takahashi This study describes inelastic seismic design of piping systems considering the damping effect caused by elastic–plastic property of a pipe support which is called an elastic–plastic support. Though the elastic–plastic support is proposed as inelastic seismic design...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. April 2012, 134(2): 021801.
Published Online: January 25, 2012
... excitations, an analytical model called the multiple yield and bounding surfaces model is proposed. On the basis of the derived mathematical formulations for simulation of the characteristics of the Multiple DO-FPS isolation bearing, it is revealed that the natural period and damping effect of the Multiple DO...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. August 2011, 133(4): 041204.
Published Online: May 16, 2011
...M. Utsumi This paper investigates the use of dynamic vibration absorbers as a means to reduce the vibration of a floating roof due to sloshing caused by long-period earthquakes. It is shown that the damping ratio of the primary system caused by the dynamic vibration absorbers increases with rising...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. February 2011, 133(1): 011301.
Published Online: January 21, 2011
...M. Utsumi This paper investigates a variational method for theoretically determining the first damping ratio of sloshing in cylindrical and arbitrary axisymmetric tanks. In this method, a virtual work expression for the viscous terms in the Navier–Stokes equations is transformed into the first-mode...
Journal Articles
Article Type: Technology Review
J. Pressure Vessel Technol. February 2011, 133(1): 014002.
Published Online: January 21, 2011
...M. J. Pettigrew; R. J. Rogers; F. Axisa This paper addresses the question of damping of multispan heat exchanger tubes with liquids (mostly water) on the shell side. The different energy dissipation mechanisms that contribute to damping are investigated. The available experimental data from the...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. August 2010, 132(4): 041309.
Published Online: August 6, 2010
... results, at least in the trend on the effect of varying the flexibility angle. At the same time, the model sheds some light on the role played by the flexibility angle in determining the overall fluid-structure damping underlying the observed stability behavior...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. August 2010, 132(4): 041307.
Published Online: July 29, 2010
... domain forces that are used to calculate added damping and stiffness coefficients employed with the UFM. The investigation demonstrates that the UFM utilized in conjunction with CFD is a viable approach for calculating the stability map for a given tube array. The FEI was predicted for in-line square and...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. August 2010, 132(4): 041304.
Published Online: July 21, 2010
... and pipe breakages. This paper examines the conditions that give rise to the large noise levels. These conditions, for the occurrence of noise, are investigated using an eigenvalue approach, which involves the effect of damping due to losses from the pipe boundaries and pipe friction. The...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. August 2010, 132(4): 041302.
Published Online: July 21, 2010
...Marwan Hassan; Achraf Hossen This paper presents simulations of a loosely supported cantilever tube subjected to turbulence and fluidelastic instability forces. Several time domain fluid force models are presented to simulate the damping-controlled fluidelastic instability mechanism in tube arrays...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. October 2009, 131(5): 051302.
Published Online: September 2, 2009
... fractions and mass fluxes. Fluidelastic instabilities, random turbulence excitation, and damping were investigated. The results were compared with those obtained for a similar tube bundle tested in an air-water cross flow and to those for a rotated triangular bundle similarly tested in Freon...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. February 2009, 131(1): 011303.
Published Online: November 10, 2008
...John Mahon; Craig Meskell The interaction between acoustic resonance and damping controlled fluidelastic instability (FEI) in a normal triangular tube array ( P ∕ d = 1.32 ) has been investigated. The duct acoustics were excited with speakers placed adjacent to the tube array to artificially...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. November 2008, 130(4): 041303.
Published Online: August 22, 2008
... structural characteristics and fluid-elastic effects due to the presence of the dense medium in the space between cylinders, followed by a forced-vibration analysis. It is shown here that the out-of-phase fluid-elastic effects (added damping) are dependent on the position of cylinders within the bundle, not...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. November 2008, 130(4): 041302.
Published Online: August 20, 2008
... the amplitude of the excitation increases. The damping ratio with the bulkhead is much larger than that without the bulkhead. The damping generated by the bulkhead depends on the amplitude of the excitation. The flow pattern plays an important role in the dissipation of the energy of the sloshing. In...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. May 2007, 129(2): 226–233.
Published Online: January 21, 2007
... were modeled for an 8 NPS pipe, using ABAQUS ® . For either material, the maximum stress was seen to be equal when damping was neglected. At the time the maximum stress occurred, the hoop stress was equivalent to twice the stress that would be expected if an equivalent static stress was applied to the...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. August 2007, 129(3): 372–382.
Published Online: January 21, 2007
... hoop stress is related to a vibration equation for a suddenly applied load. Consideration of structural and fluid damping, as well as pipe constraints at the end of the pipe, were considered in the derivation of the vibration equations. In short, vibration equations are presented in this paper and are...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. February 2007, 129(1): 118–124.
Published Online: April 9, 2006
... account coupling between the solid tube and surrounding fluid at the borehole/expanded tube annulus, as well as the damping effect on tube structural response. The paper also conducts a comparative study aiming at studying the post-expansion tubular fluid response and identifying the different features...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. November 2006, 128(4): 508–515.
Published Online: February 16, 2006
... in which motion of auxiliary mass is limited by motion-limiting stop or placed inside a container. In this paper, in order to consider energy loss for an impact represented by the coefficient of restitution and duration of collision, an analytical model with hysteresis damping is introduced. Using...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. August 2006, 128(3): 364–369.
Published Online: August 30, 2005
... with and without EPD on shaker table. Using a finite element model of the piping systems, linear and nonlinear time-history analysis is carried out using Newmark’s time integration technique. Equivalent linearization technique, such as Caughey method, is used to evaluate the equivalent damping of the...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. November 2005, 127(4): 502–507.
Published Online: June 24, 2005
... various parameters that could affect the seismic structural response have been identified as material strength of concrete, structural damping available within the structure, and the normalized ground motion response spectral shape. Based on this limited case study, the seismic fragility of the structure...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. November 2004, 126(4): 523–533.
Published Online: December 1, 2004
...M. J. Pettigrew, Fellow ASME; C. E. Taylor Two-phase flow exists in many shell-and-tube heat exchangers such as condensers, evaporators, and nuclear steam generators. Some knowledge on tube damping mechanisms is required to avoid flow-induced vibration problems. This paper outlines the development...