An equivalent mechanical model with nonlinear damping for sloshing rectangular tank with porous media
Journal
Ocean Engineering
Journal Volume
242
Date Issued
2021
Author(s)
Abstract
In this paper, the impulsive and harmonic experiments are carried out to investigate the sloshing frequencies and the linear and nonlinear damping of sloshing liquid in a rectangular tank occupied by porous media. As the oscillatory responses remain linear in the impulsive-excitation tests, the damping ratios are obtained by the free-vibration decay method. The analytical method, which is an equivalent mechanical model based on Darcy's law, is developed for comparison. As the dynamic responses become nonlinear in the harmonic excitations, the relationships between the sloshing force and the ground displacement are constructed and the damping ratio is determined by the resonance energy loss method. The relationships between the equivalent damping ratio, wave amplitude, and ground displacement amplitude for the large-excitation cases are established to justify the nonlinear damping effect. A modified mechanical model with a nonlinear damping mechanism is provided. ? 2021 Elsevier Ltd
Subjects
Equivalent mechanical model
Nonlinear sloshing damping
Porous media
Sloshing behavior
Damping
Energy dissipation
Flow of fluids
Liquid sloshing
Tanks (containers)
Damping ratio
Equivalent mechanical models
Ground displacement
Nonlinear damping
Nonlinear sloshing
Porous medium
Rectangular tank
Sloshing damping
Porous materials
amplitude
computer simulation
damping
Darcy law
displacement
experimental study
fluid mechanics
nonlinearity
numerical model
porous medium
storage tank
Type
journal article