Numerical Study on the Slamming Impact of Stiffened Flat Panel Using Icfd Method - Effect of Structural Rigidity on the Slamming Pressure \u2013

2021 ◽  
Author(s):  
Yasuhria Yamada ◽  
Kota Takamoto ◽  
Toru Nakanishi ◽  
Chong Ma ◽  
Yusuke Komoriyama
Keyword(s):  
Numerical Study ◽  
Flat Panel ◽  
Structural Rigidity ◽  
Method Effect

Numerical Study on the Slamming Impact of Stiffened Flat Panel Using ICFD Method: Effect of Structural Rigidity on the Slamming Impact

2020 ◽  
Author(s):  
Yasuhira Yamada ◽  
Kota Takamoto ◽  
Toru Nakanishi ◽  
Ma Chong ◽  
Yusuke Komoriyama
Keyword(s):  
Numerical Study ◽  
Structural Response ◽  
Mesh Size ◽  
Stiffened Panel ◽  
Offshore Structure ◽  
Flat Panel ◽  
Fluid Structure ◽  
Benchmark Study ◽  
Structural Rigidity ◽  
Method Effect

Abstract In order to preliminary investigate structural response of stiffened panel due to slamming impact, two series of fluid structure coupling analysis is carried out using a new fluid structure interaction (FSI) methodology of Incompressible Fluid Dynamics (ICFD) [1]. ICFD is the method where structure and fluid are modeled as both Lagrange methods. Firstly, slamming impact of a sphere is analyzed with ICFD and SPH methods respectively and compared with experimental and analytical results. Acceleration, slamming force and pressure are compared and discussed in detail. Secondary a fixed stiffened flat panel of offshore structure subjected to slamming impact is investigated as a part of the ISSC II.1 benchmark study. Effect of mesh size is investigated. Analysis results are compared with existing ALE method [1] as well as other results within the framework of ISSC II.1 benchmark study. In both studies, structure is modeled by elastic-plastic and by rigid respectively. By comparing these two results, effect of structural rigidity on the slamming pressure as well as slamming force is investigated.

The Organization of Actin Filaments in the Stereocilia of the Bird Cochlea

1980 ◽  
Vol 38 ◽  
pp. 554-555
Author(s):  
E.J. Battles ◽  
D. DeRosier ◽  
J.C. Saunders ◽  
L.G. Tilney
Keyword(s):  
Hair Cell ◽  
Diffraction Pattern ◽  
Sea Urchin ◽  
Actin Filaments ◽  
Optical Diffraction ◽  
Dense Material ◽  
Apical Surface ◽  
Structural Rigidity ◽  
High Degree ◽  
Degree Of Order

Extending from the apical surface of each hair cell of the chick cochlea are from 75 to 200 microvilli or stereocllia and one true cllium, the kinocilium. The stereocllia are arranged in rows of progressively increasing length (Fig. 1). Within each tapering sterocilium is a bundle of actin filaments with over 900 filaments near the tip yet only approximately 25 at the base where filaments are enmeshed in a dense material (Fig. 1); from here some of the filaments enter the apical surface of the cell (cuticular plate) as a rootlet. Examination of longitudinal sections of the stereocilia (Fig. 2) show that the filaments are aligned parallel to each other and show considerable order. Examination of an optical diffraction pattern of this bundle (Fig. 4) reveal that the actin filaments are packed such that the crossover points of adjacent actin filaments are inregister. A prominent reflection at 125Å−1 demonstrates that the filaments are cjossbridged by a macromolecular bridge situated at an average of 125Å−1 intervals (Fig. 4) in transverse sections the filaments appear hexagonally packed although there are regions where the filaments are less ordered (Fig. 3). In images processed in the computer to remove, noise and enhance detail periodic nature of the bridge can be clearly seen (see arrows Fig. 5). This image resembles that of an actin paracrystal formed from sea urchin extract composed of bundles of actin filaments crossbridged by a second protein. Thus the actin filaments in the bird stereocilia by being cross-bridged and packed with a high degree of order and produces a structure with considerable structural rigidity. Embryos were studied at various stages in development in an attempt to determine how the stereocilia form and how does the actin packing develops. These stages will be discussed.

1573: Flat-Panel Volume Computerized Tomography (VCT) has Decreased Variability in Hounsfield Unit Measurements Compared to Conventional Helical Computerized Tomography

2005 ◽  
Vol 173 (4S) ◽  
pp. 426-426
Author(s):  
Dianne E. Sacco ◽  
Patricio Gargollo ◽  
Gupta Rajiv ◽  
Ijad Madisch ◽  
Ronald Arellano ◽  
...  
Keyword(s):  
Computerized Tomography ◽  
Hounsfield Unit ◽  
Flat Panel

Numerical study of the low-frequency atomic dynamics in a Lennard-Jones glass

1998 ◽  
Vol 77 (2) ◽  
pp. 473-484 ◽  
Author(s):  
M. Sampoli, P. Benassi, R. Dell'Anna,
Keyword(s):  
Numerical Study ◽  
Low Frequency ◽  
Lennard Jones
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