... digital twin stiffness fatigue life laboratory model operational modal analysis displacement sea state superelement fatigue damage upstream oil & gas buoy data eigenmode platform natural frequency modal coordinate frequency deviation modal parameter design life jonswap...

... displacement maximum transversal displacement diameter hydraulic jet pump oliveira jr displacement clearance nonuniform shaft eigenfrequency rotor eigenmode multiphase pump twin-screw multiphase pump artificial lift system Evaluation of Transversal Displacements of the Rotor of a Twin-Screw...

... optimization optimization problem research method eigenmode non-destructive inspection density function eigenvalue damage detection method optimal structure target structure design variable Damage Detection Method by Topology Optimization Based on Eigenvalue Analysis Takafumi Nishizu (1): Akihiro...

... structure reservoir characterization engineering offshore industry dynamic analysis structural response pushover analysis upstream oil & gas seismic analysis eigenmode ground motion time history analysis characteristic dynamic time domain analysis history time domain analysis principal...

... displacements, near the reference catenary configuration. These equations are obtained for in-plane and out-of plane displacements. Simplifications of these equations are then presented and lead to the determination of eigenmodes and eigenfrequencies for both in and outof- plane modes. A comprehensive...

... advantage of the concept is to reduce internal forces between the different modules, and consequently reducing the challenge of designing detachable connecting elements (connectors). A drawback is the resulting dynamic system with a large number of eigenmodes. Structural dampers are one of the remedies...

... and measured providing thus a kind of qualitative comparison to the numerical data (J. Luukkonen, 1999). configuration sandwich bottom stiffness rigid body node meshed section obstacle right cross-section bottom structure contact force ship eigenmode sandwich bottom structure cross-section...

... WKB approximate solution is derived for the general riser-like problem, given the tension function along the length. A simple formula for the natural frequencies and eigenmodes of a catenary riser under no current is then derived from WKB general solution. Compared to Bessel's approximations...

... vibration equation direct method structural deflection eigenmode incident wave equation amplitude relation deflection numerical scheme upstream oil & gas hydroelastic response pressure distribution free-end boundary condition integral equation elastic deflection boundary...

... This paper deals with three-dimensional responses of huge floating structure in head and quartering seas. Huge mat-like floating structure is considered as an elastic plate. First we estimate dry-eigenmodes of the completely free plate by employing finite element method. Then, hydrodynamic...

... drag. mechanism cable diameter static tension dynamic tension submerged cable investigation normal response upstream oil & gas cable tangential response tension resonance nonlinear drag model excitation amplitude section modulus frequency eigenmode coefficient subsea system...

... ABSTRACT When a large number of eigenmodes are required in the response analysis of structural systems, traditional eigenvalue solvers become usually expensive and impractical. Therefore alternative solution algorithms for such an eigenvalue problem may be more interesting. In this paper...