Mediouni M.,2500 Boul Of Luniversite |
Volosnikov A.,Federal State Budgetary Institution
Journal of Orthopaedics | Year: 2015
Generally, in some universities of medicine, orthopaedic training procedures represent a difficult task due to the inadequacies of the systems, the resources, and the use of technologies. This article explains the challenges and the needs for more research in the issue of orthopaedic simulation around the world. © 2015 Prof. P K Surendran Memorial Education Foundation.
PubMed | Federal State Budgetary Institution and 2500 Boul Of Luniversite
Type: Journal Article | Journal: Journal of orthopaedics | Year: 2015
Generally, in some universities of medicine, orthopaedic training procedures represent a difficult task due to the inadequacies of the systems, the resources, and the use of technologies. This article explains the challenges and the needs for more research in the issue of orthopaedic simulation around the world.
Remmler S.,Von Karman Institute for Fluid Dynamics |
Remmler S.,TU Munich |
Christophe J.,Von Karman Institute for Fluid Dynamics |
Anthoine J.,Von Karman Institute for Fluid Dynamics |
And 3 more authors.
16th AIAA/CEAS Aeroacoustics Conference (31st AIAA Aeroacoustics Conference) | Year: 2010
A method is proposed to calculate the trailing edge broadband noise emitted from an airfoil based on a steady Reynolds-Averaged Navier-Stokes (RANS) solution of the flow field. For this purpose the pressure spectrum on the airfoil surface near the trailing edge is calculated using a statistical model proposed by Panton & Linebarger from the RANS mean velocity and turbulence data in the airfoil boundary layer. The obtained wall pressure spectrum is used to compute the radiated sound by means of an aeroacoustic analogy, namely Amiet's theory of airfoil sound. The statistical model for wall pressure fluctuations is validated with two test cases from the literature, a boundary layer with adverse pressure gradient and a flat plate boundary layer without pressure gradient. The influence of specific model assumptions is studied, such as the convection velocity of pressure producing structures and the scale anisotropy of boundary layer turbulence. Furthermore the influence of the RANS simulation on the calculated spectra is investigated using three different turbulence models. The method finally is applied to the case of a Valeo Controlled-Diffusion airfoil placed in a jet wind tunnel in the anechoic facility of Ecole Centrale de Lyon. RANS solutions for this test case are computed with different turbulence models, the wall pressure spectrum near the trailing edge is calculated using the statistical model and the radiated noise is computed with Amiet's theory. All intermediate results of the method are compared to experimental data. © 2010 by the authors.
Alimonti L.,2500 Boul Of Luniversite |
Atalla N.,Université de Sherbrooke
INTER-NOISE 2015 - 44th International Congress and Exposition on Noise Control Engineering | Year: 2015
This paper is concerned with the development of a hybrid methodology to speed up finite element analysis in vibroacoustic applications. The approach aims at avoiding the finite element modeling of the noise control treatment, which is cumbersome from both computational (i.e. model size) and virtual prototyping (i.e. meshing) standpoints. A transfer matrix model is instead employed, allowing for a reduction of the computational burden and a substantial simplification of the multilayer modeling. The methodology relies on the assumption that the noise control treatment is flat, homogeneous and of infinite lateral extent (i.e. finite size effects are negligible). The latter hypothesis is justified by short wavelength and high dissipation. Under these circumstances, the surface impedance at the two ends of the laterally unbounded noise control treatment can be formally obtained starting from an integral formulation. Results prove that, generally speaking, the hybrid finite element-transfer matrix model can always capture the qualitative behavior of the vibroacoustic system. However, it is shown that, in some cases, finite size effects within the noise control treatment may be important. Hence, a correction is proposed to retrieve the missing performance. © 2015 by ASME.