Investigation of Multi-Material Bird Models for Predicting Impact Loads

Volume 5: Structures and Dynamics, Parts A and B ◽

10.1115/gt2008-51005 ◽

2008 ◽

Cited By ~ 2

Author(s):

Lakshmi S. Nizampatnam ◽

Walter J. Horn

Keyword(s):

Smoothed Particle Hydrodynamics ◽

Research Work ◽

Material Model ◽

Experimental Results ◽

The Other ◽

Impact Loads ◽

Excellent Correlation ◽

Particle Hydrodynamics ◽

Bird Impact ◽

Smoothed Particle

This research work investigated the use of multi-material bird models for accurately predicting bird impact loads. Numerical simulations carried out using the SPH (Smoothed Particle Hydrodynamics) technique of LS-Dyna showed excellent correlation with the experimental results. The multi-material bird models of this work are more rigorous than in any previously published work, and include a realistic bird shape. Each material model was distinct, having its own density value (different from the other materials) and an associated equation of state. Results indicated that using a multi-material bird with various combinations of materials permits better correlation with experimental results.

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Study on the Gear Modeling in SPH Analysis

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.33-37.773 ◽

2008 ◽

Vol 33-37 ◽

pp. 773-778

Author(s):

Zhi Gang Yao ◽

Rahmatjan Imin ◽

Mamtimin Gheni

Keyword(s):

Dynamic Mechanical Analysis ◽

Smoothed Particle Hydrodynamics ◽

Mechanical Analysis ◽

Modeling Method ◽

The Other ◽

Transition Curve ◽

Analysis Method ◽

Particle Hydrodynamics ◽

Smoothed Particle ◽

Global And Local

This article presents the gear modeling method in dynamic mechanical analysis using SPH (Smoothed Particle Hydrodynamics) analysis method. The parameter equations of the transition curve of gear root and the other parts of gear are decided. The 3D discrete particles model is established based on the parameter equations. The SPH pre-process program of global and local dividing is developed. The error between the divided discrete particles and theoretical profiles of the gear has been analyzed. The analysis results show that this modeling method is a relatively better method and the correct SPH discrete particles can be divided by this method.

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Numerical Simulation of Rigid Cylindric Plate's Sinkage on Soil Based on SPH/FEM Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1049-1050.483 ◽

2014 ◽

Vol 1049-1050 ◽

pp. 483-486

Author(s):

Ting Xia ◽

Gang He ◽

Peng Hu ◽

Xiao Long Li

Keyword(s):

Numerical Simulation ◽

Stress Distribution ◽

Dynamic Simulation ◽

Smoothed Particle Hydrodynamics ◽

Mechanical Design ◽

Material Model ◽

Fem Method ◽

Particle Hydrodynamics ◽

Smoothed Particle ◽

Simulation Results

Based on smoothed particle hydrodynamics (SPH) and FEM method, the dynamic simulation of rigid cylindric plate's sinking process on soil is studied with LS-DYNA software, and MAT 147 material model is used to describe soil's attributes. The stress distribution and flowing trend of the soil are compared at different period. The simulation results show that the SPH/FEM method is useful to analyze large deformation of soil, and our findings can give helps to the mechanical design of the components interacting with soil.

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THE HYDRODYNAMIC COEFFICIENTS FOR OSCILLATING 2D RECTANGULAR BOX USING WEAKLY COMPRESSIBLE SMOOTHED PARTICLE HYDRODYNAMICS (WCSPH) METHOD

IIUM Engineering Journal ◽

10.31436/iiumej.v19i2.889 ◽

2018 ◽

Vol 19 (2) ◽

pp. 172-181

Author(s):

Muhammad Zahir Ramli

Keyword(s):

Smoothed Particle Hydrodynamics ◽

Experimental Results ◽

Solid Boundary ◽

Hydrodynamic Coefficients ◽

Radiation Problem ◽

Weakly Compressible ◽

Particle Hydrodynamics ◽

Smoothed Particle ◽

Hydrodynamics Coefficients ◽

Wcsph Method

ABSTRACT: An implementation of the weakly compressible smoothed particle hydrodynamics (WCSPH) method is demonstrated to determine the hydrodynamics coefficients through radiation problem of an oscillating 2D rectangular box. Three possible modes of motion namely swaying, heaving, and rolling are carried out to establish the influence of oscillating motions in predicting the added mass and damping. Both solid boundary and fluid flow are modelled by WCSPH and validated by the potential flow and experimental results. Discrepancies observed at lower frequencies are further investigated using different particle resolutions, different time steps, and extending the domain with longer runtime to demonstrate the performance of WCSPH. Finally, flow separation and vortices are discussed and compared with experimental results. ABSTRAK: Bagi fenomena yang melibatkan radiasi dalam air, segiempat kotak 2D diosilasikan dengan menggunakan simulasi WCSPH untuk memperoleh pekali hidrodinamik. Mod osilasi terbahagi kepada 3 iaitu sway, heave dan roll. Osilasi dengan mengguna pakai kotak akan mempengaruhi pergerakan air dalam menentukan nilai penambahan jisim dan rendaman. Keseluruhan domain air dan sempadan telah dimodelkan dengan menggunakan WCSPH. Semua model tersebut kemudiannya akan dibandingkan melalui keputusan eksperimen dan teori. Jika keputusan melalui kaedah WCSPH ini berbeza, terutama pada frekuensi rendah, penyelidikan lanjut akan dilakukan dengan menggunakan zarah resolusi yang berbeza, langkah masa yang berbeza dan menambah masa domain ujikaji bagi menilai keputusan WCSPH. Akhirnya, kriteria aliran dan kadar pusaran yang terhasil di sekeliling kotak akan dibincang dan dibandingkan bersama keputusan eksperimen.

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Anchor Dragging Analysis of Rock-Berm Using Smoothed Particle Hydrodynamics Method

Shock and Vibration ◽

10.1155/2015/687623 ◽

2015 ◽

Vol 2015 ◽

pp. 1-8

Author(s):

Jinho Woo ◽

Dongha Kim ◽

Won-Bae Na

Keyword(s):

Smoothed Particle Hydrodynamics ◽

Safety Margin ◽

Material Model ◽

Dynamic Responses ◽

Power Cable ◽

Structural System ◽

Tensile Forces ◽

Particle Hydrodynamics ◽

Smoothed Particle ◽

Smoothed Particle Hydrodynamics Method

This study presents dynamic responses of rock-berm structural system under anchor dragging and accordingly provides the characteristics of the stresses and displacements obtained. For the purpose, first, a rock-berm was modeled by the SPH (smoothed particle hydrodynamics) method and piecewise Drucker-Prager material model by facilitating the associated software package—ANSYS-AUTODYN. Second, 2-ton stockless anchor was modeled as a rigid body and eventually dragging external force was obtained. Then, the dragging velocity (1 and 2 m/s) was considered as a parameter to investigate the effect of its variation on the responses. Finally, the dragging tensile forces of the anchor cable were obtained and compared according to the dragging velocities. It is shown that the four-layer rock-berm gives the safety margin to the submarine power cable according to the unaffected gauge points near the cable. This safety is accomplished by the four layers (related to rock-berm height) and the number of rock particles at each layer (related to rock-berm widths).

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