Parallel Computation of 3-D Soil-Structure Interaction in Time Domain with a Coupled FEM/SBFEM Approach

Schauer, Marco; Román, José E.; Quintana–Ort́ı, Enrique S.; Langer, Sabine

doi:10.1007/s10915-011-9551-x

Cited by 36 publications

(21 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Considering a weak coupling, a finite element model of the aircraft fuselage is excited by the received pressure on the outer skin (due to jet noise) and solved by the in-house code ELPASO [9]. A numerical modeling chain is applied for the simulation of cabin noise in dependence on jet noise.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Cabin noise prediction using wave‐resolving aircraft models

Langer

Blech

2019

Proc Appl Math and Mech

View full text Add to dashboard Cite

Within the Coordinated Research Center (CRC) 880, future civil aircraft with short take-off and landing capabilities are investigated. A main motivation are efficient point-to-point connections within Europe. Environmental friendliness is a key factor in the development of such aircraft systems in order to ensure the acceptance of new technologies. Therefore, the sound immission at the ground and in the passenger cabin is a major focus in the project. In this paper, wave-resolving models of complex aircraft fuselage structures and solution strategies of these large systems in frequency domain are presented.On the basis of preliminary aircraft design data available in the project, a mechanical model of all fluid and structural parts is developed. The model comprises the back partition starting from the wing-box and assumes a linear behavior in deflection, strain and material. The thickness distribution on the outer surface, the stiffeners, the floor, the bulk heads and the inner panels are considered concerning the structural domain. The insulation is modeled by an equivalent fluid approach. The cabin fluid, the structural domain, and the insulation are fully coupled. All domains are discretized automatically applying coincident nodes at the coupling interfaces. Frequency-dependent pressure fluctuations distributed on the outer surface as a result of Computational Aeroacoustic (CAA) simulations of jet noise are applied to the model. A realistic consideration of such characteristic noise footprints is only possible due to the wave-resolving approach. The direct result of the aircraft model is the cabin's pressure field in frequency domain.The finite element discretization leads to a system of equations with 1-3 mio degrees of freedom to be solved in frequency domain. As one solver run is easily realized, many solutions in the frame of uncertainty analyses or sensitivity studies require a highly efficient solution process. Different strategies applying direct solvers, iterative solvers or its combination are discussed within this contribution as well.

show abstract

Section: Resultsmentioning

confidence: 99%

“…All domains are discretized by finite elements and solved by the working group's in-house code ELPASO [9]. linearity, stationarity regarding the response in cruise flight, symmetry with inversely phased excitation by the two identical engines in cruise flight, neglection of the aircraft's structural front partition).…”

Section: Wave-resolving Aircraft Modelmentioning

confidence: 99%

Cabin noise prediction using wave‐resolving aircraft models

Langer

Blech

2019

Proc Appl Math and Mech

View full text Add to dashboard Cite

show abstract

“…The numerical solution is carried out for a period of 6.25s with a time step length ∆t = 0.0125s ≤ ∆t crit , so that 500 time steps have to be computed. Since the settlement problem is solved in time domain, the chosen period must assure that the system reaches its steady-state within this period [29]. The parameters of the Generalized-α time step integration scheme can be defined by a dissipation parameter within the range 0 ≤ ρ ∞ ≤ 1 (ρ ∞ = 0 asymptotic annihilation, ρ ∞ = 1 no dissipation).…”

Section: Numerical Solutionmentioning

confidence: 99%

On the influence of far-field model reduction techniques using a coupled FEM-SBFEM approach in time domain

Schauer¹

2018

Journal of Mathematical Sciences and Modelling

Self Cite

View full text Add to dashboard Cite

To analyse soil-structure-interaction problems, often unbounded domain has to be taken into account. Since the finite element method (FEM) does not provide open boundary itself the scaled boundary finite element method (SBFEM) which fulfils the radiation condition for wave propagation to infinity is used. The coupling of FEM and SBFEM in time domain is very time and memory consuming, due to the almost fully populated acceleration unitimpulse matrices and the convolution integral, which has to be solved at every time step. This paper studies ways to overcome this drawback and describes the influence of different model reduction techniques: like extrapolated acceleration unit-impulse response matrices, geometric far-field decoupling and sub-structured far-fields which can be applied to the far-field and also their combination. The different techniques for a FEM-SBFEM coupling in time domain are evaluated in terms of accuracy and computational effort.

show abstract

“…The computational cost increases with problem size increasing. Therefore, many researches' efforts have been devoted to improve the computational efficiency recently [29][30][31][32]. A novel SBFE solution method has been proposed recently with the continued fraction method.…”

Section: Introductionmentioning

confidence: 99%

High performance of the scaled boundary finite element method applied to the inclined soil field in time domain

Lin

2015

Engineering Analysis with Boundary Elements

View full text Add to dashboard Cite

Parallel Computation of 3-D Soil-Structure Interaction in Time Domain with a Coupled FEM/SBFEM Approach

Cited by 36 publications

References 22 publications

Cabin noise prediction using wave‐resolving aircraft models

Cabin noise prediction using wave‐resolving aircraft models

On the influence of far-field model reduction techniques using a coupled FEM-SBFEM approach in time domain

High performance of the scaled boundary finite element method applied to the inclined soil field in time domain

Contact Info

Product

Resources

About