Temat: interaction - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Exact Controllability of an Elastic Membrane Coupled With a Potential Fluid
Autorzy:: Hansen, S.
Tematy:: sterowność
system elastyczny
exact controllability
fluid-elastic interaction
fluid-structure interaction
potential fluid; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/908130.pdf Link otwiera się w nowym oknie
Opis:: We consider the problem of boundary control of an elastic system with coupling to a potential equation. The potential equation represents the linearized motions of an incompressible inviscid fluid in a cavity bounded in part by an elastic membrane. Sufficient control is placed on a portion of the elastic membrane to insure that the uncoupled membrane is exactly controllable. The main result is that if the density of the fluid is sufficiently small, then the coupled system is exactly controllable.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Improved aeroelastic design through structural optimization
Autorzy:: Nowak, M.
Tematy:: fluid-structure interaction
biomimetics
structural optimization; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/201308.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the idea of coupled multiphysics computations. It shows the concept and presents some preliminary results of static coupling of structural and fluid flow codes as well as biomimetic structural optimization. The model for the biomimetic optimization procedure was the biological phenomenon of trabecular bone functional adaptation. Thus, the presented structural bio-inspired optimization system is based on the principle of constant strain energy density on the surface of the structure. When the aeroelastic reactions are considered, such approach allows fulfilling the mechanical theorem for the stiffest design, comprising the optimizations of size, shape and topology of the internal structure of the wing.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Piezoelectric controlled noise attenuation of engineering systems
Tłumienie hałasu w konstrukcjach inżynierskich za pomocą elementów piezoelektrycznych
Autorzy:: Ringwelski, S.
Luft, T.
Gabbert, U.
Tematy:: FEM
BEM
fluid-structure interaction
piezoelectricity
active control; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/279285.pdf Link otwiera się w nowym oknie
Opis:: In the paper, a recently developed overall numerical approach is presented, which is suitable to design smart engineering systems to actively reduce sound radiation. For this reason, piezoelectric patch actuators and sensors are attached to the surface of the structure to control structural vibrations. In the paper, the theoretical background of the design process is briefly presented first. The basis is a combined finite element and boundary element approach. Electromechanical coupled finite elements are applied to model the structure as well as the piezoelectric patches. The finite element method is also used to model fluid domains which are partially or totally bounded by the structure. Boundary elements are used to characterize the unbounded acoustic pressure fields. Then it is shown how control algorithms can be included into the simulation process, which finally results in an overall simulation approach for structural acoustic systems including control. The numerical approach is also verified by measurements. The experimental setup enables measurements of the uncontrolled and controlled radiated sound fields using a microphone array. A comparison between the measured values and those predicted by the proposed coupled finite element-boundary element approach shows good agreement. Finally, it is demonstrated how the approach can be applied to real engineering systems. As an example, noise reduction of a car engine with a smart oil pan is presented. Again, the numerical results of the uncontrolled and controlled behavior are in good agreement with the measurements. It can be concluded that the proposed overall numerical approach can be applied to design real engineering systems, which are able to actively reduce the noise level.
W pracy przedstawiono ostatnio opracowaną przez autorów metodę obliczeniową do projektowania konstrukcji „inteligentnych”, których zadaniem jest redukcja emisji hałasu. Do samego tłumienia hałasu użyte są elementy piezoelektryczne przyklejane do powierzchni danej konstrukcji. Na początek omówiono podstawy teoretyczne projektowania takich układów. Podstawę stanowi kombinacja metody elementów skończonych i brzegowych. Elementy skończone ze sprzężeniem elektromechanicznym służą do modelowania piezoelektryków i konstrukcji bazowej. Metodę elementów skończonych zastosowano także do modelowania płynu znajdującego się wewnątrz projektowanego urządzenia przy częściowym lub całkowitym zamknięciu płynu ścianami konstrukcji. Elementy brzegowe użyto do opisu otwartego pola akustycznego. Następnie pokazano sposób, w jaki algorytmy sterowania należy wprowadzić do ogólnej procedury obliczeniowej do projektowania urządzeń z aktywnym układem redukcji hałasu. Otrzymane rezultaty symulacji numerycznych zweryfikowano pomiarami z doświadczeń. Stanowisko badawcze zostało wyposażone w odpowiedni układ mikrofonów, co umożliwiło pomiar poziomu hałasu z włączonym i wyłączonym układem sterowania. Stwierdzono dobrą zgodność wyników eksperymentu z zaproponowaną metodą numeryczną wykorzystującą elementy skończone i brzegowe. Na koniec omówiono przykład zastosowania zaproponowanej metody do projektowania rzeczywistej konstrukcji. Zaprezentowano silnik samochodowy z układem aktywnej redukcji hałasu umiejscowionym na misce olejowej. Powtórnie zbadano zgodność wyników symulacji numerycznych z pomiarami doświadczalnymi, stwierdzając dobrą zgodność pomiędzy nimi. W konkluzji uznano, że zaproponowana metoda nadaje się do zintegrowania z ogólnymi algorytmami projektowania rzeczywistych konstrukcji inżynierskich, w których nacisk położono na redukcję poziomu hałasu.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Study on striking ship with loading impact on the performance of the double hull oil tanker collision
Autorzy:: Wu, W.
Yang, Y.
Zhang, J.
Lu, J.
Tematy:: ship collision
fluid-structure interaction
impact parameters
numerical simulation; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/258890.pdf Link otwiera się w nowym oknie
Opis:: Due to the great danger of the collision of oil tankers, lots of research on the collision of oil tankers has been carried out. But, at present, the research on the collision of oil tankers mainly focuses on the loading condition of the struck ship, ignores the impact on the loading condition of the striking ship. However, during the actual oil tanker collision, the striking ship is generally in the state of loading. Therefore, it is necessary to carry out the analysis of the impact of the loading condition of the striking ship on the collision damage of the oil tanker. In this paper, the effect of striking ship with loading on the impact performance of the side structure during the collision of the cargo double hull oil tanker has been investigated. The ship collision model was established by using the finite element software ANSYS/ LS-DYNA which is based on 7000 tons of double hull oil tankers. Based on the analysis of the collision force, impact of striking speed changes, impact of striking deep changes and structural energy absorption during the collision process, the influence of the striking ship with loading on the damage mechanism and the impact performance of the double shell oil ship side structure was expounded. The results show that the influence of the striking ship with loading can be great to the damage to side hull during the research of the collision performance of the oil tanker.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Eigencharacteristics of fluid filled tanks: an extended symmetrical coupled approach
Autorzy:: Wiśniewski, A.
Kucharski, R.
Tematy:: fluid-structure interaction
modal analysis
free vibration
acoustic method
FEM; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/1933192.pdf Link otwiera się w nowym oknie
Opis:: In the numerical analysis of the eigen behaviour of large liquid and gas storage tanks, an important role is played by initial pre-stressing of such thin-walled structures due to high fluid pressure and gravity. In a majority of numerical simulations, the finite state of deformation is first calculated, following which small, linear vibrations are superimposed on the finite state. This paper is devoted to refinement and assessment of the basic Eckart superimposed eigencharacteristics problem simultaneously stated in fluid and thin-walled structures. Eckart's coupled approach leads to variational structure-fluid coupling in the so-called acoustic approximation. In order to verify the feasibility and correctness of the symmetrical Eckart approach, finite element discretization and a calculation example of a rectangular tank are presented. The calculated results are compared with literature ones.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Numerical analysis of the effect of flexibilityon the propulsive performance of a heaving hydrofoil undergoing sinusoidal and non-sinusoidal motions
Autorzy:: Li, Fengkun
Yu, Pengyao
Wang, Qiang
Li, Guangzhao
Wu, Xiangcheng
Tematy:: fluid-structure interaction
flexible hydrofoil
non-sinusoidal motions
propulsive characteristics; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/2033183.pdf Link otwiera się w nowym oknie
Opis:: Numerical simulations of fluid‒structure interaction (FSI) on an elastic foil heaving with constant amplitude in freestream flow are carried out at a low Reynolds number of 20,000. The commercial software STAR-CCM+ is employed to solve the flow field and the large-scale passive deformation of the structure. The results show that introducing a certain degree of flexibility significantly improves the thrust and efficiency of the foil. For each Strouhal number St considered, an optimal flexibility exists for thrust; however, the propulsive efficiency keeps increasing with the increase in flexibility. The visualisation of the vorticity fields elucidates the improvement of the propulsive characteristics by flexibility. Furthermore, the mechanism of thrust generation is discussed by comparing the time-varying thrust coefficient and vortex structure in the wake for both rigid and elastic foils. Finally, in addition to sinusoidal motions, we also consider the effect of non-sinusoidal trajectories defined by flattening parameter S on the propulsive characteristics for both rigid and elastic foils. The non-sinusoidal trajectories defined by S=2 are associated with the maximum thrust, and the highest values of propulsive efficiency are obtained with S=0.5 among the cases considered in this work.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: New biomimetic approach to the aircraft wing structural design based on aeroelastic analysis
Autorzy:: Gawel, D.
Nowak, M.
Hausa, H.
Roszak, R.
Tematy:: optimization
fluid-structure interaction
coupling techniques
biomimetics
optymalizacja
sprzęganie
biomimetyka; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/199862.pdf Link otwiera się w nowym oknie
Opis:: This paper presents a new biomimetic approach to the structural design. For the purpose of aircraft wing design the numerical environment combining simultaneous structural size, shape, and topology optimization based on aeroelastic analysis was developed. For the design of aircraft elements the optimization process must be treated as a multi-load case task, because during the fluid structure interaction analysis each step represents a different structural load case. Also, considering different angles of attack, during the CFD computation each result is considered. The method-specific features (such as domain independence, functional configurations during the process of optimization, and multiple load case solution implemented in the optimization scenario) enable the optimal structural form. To illustrate the algorithm functionality, the problem of determining the optimal internal wing structure was presented. The optimal internal wing structure resulting from aeroelastic computation with different angles of attack has been presented.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Application of Overlapping Mesh in Numerical Hydrodynamics
Autorzy:: Panahi, R.
Shafieefar, M.
Tematy:: finite volume
two-phase flow
overlapping mesh
fluid-structure interaction; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/258676.pdf Link otwiera się w nowym oknie
Opis:: A Finite Volume (FV) algorithm is presented to investigate two-dimensional hydrodynamic problems including viscous free surface flow interaction with free rigid bodies in the case of large and/or relative motions. Two-phase flow with complex deformations at the interface is simulated using a fractional stepvolume of fluid algorithm while it is also capable of representing a high quality wave tank, according to implemented temporal discretisation. Rigid body motions are also captured using two overset meshes. Flow variables are transferred using a simple fully implicit non-conservative interpolation scheme which maintains the second-order accuracy of implemented spatial discretisation. A code is developed and an appropriate set of problems are investigated. Results show a good potential to develop a virtual hydrodynamics laboratory.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Dynamic analysis of the aortic valve functioning
Autorzy:: Patralski, Krzysztof
Tematy:: aortic valve
algorithm ALE
fluid-structure interaction
finite element analysis; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/1839626.pdf Link otwiera się w nowym oknie
Opis:: The aim of the paper was to recognize the influence of mechanical factors on the movement of the leaflets. Mechanical stimuli may have a positive effect on remodeling the leaflet material to adapt its structure to a changing load. A model of the valve functioning process was developed. A geometric model similar to the construction of a natural valve was adopted. The hybrid process of the liquid-solid interaction problem was described. The interaction process was modeled. The problem was formulated with the Galerkin FEM method. Numerical analyses of a single valve work cycle and the calcification process of aortic valve bioprostheses were performed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Structural response of a blast loaded fuselage
Autorzy:: Dacko, A.
Toczyski, J.
Tematy:: thin-walled structures
blast wave load
fluid-structure interaction
LS-DYNA; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/246151.pdf Link otwiera się w nowym oknie
Opis:: The most important task in tests of resistance of aircraft structures to the terrorist threats is to determine the sensitivity of thin-walled structures to the blast wave load. For obvious reasons, full-scale experimental investigations are carried out exceptionally. In such cases numerical analyses are very important. They allow tuning modelparameters for proper correlation with experimental data. With this preliminary analysis experiment can be planned properly. The paper presents a summary of the results of numerical analysis of model of medium sizefuselage. Various manufacturing techniques are considered - the skin made of aluminum alloy (2024-T3) and the skins made of modern layered materials (GLARE) were compared. Characteristics of the materials used in FE simulations were obtained experimentally. Modelling of C4 detonation was also discussed. Studies have shown very strong sensitivity of the results to chosen numerical models of materials, formulations of elements, assumed parameters etc. Studies confirm also very strong necessity of the correlation of analysis results with experimental data. Without such a correlation it is difficult to talk about the validation of the results obtained from the "explicit" codes.
Dostawca treści:: Biblioteka Nauki

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