Axial-Symmetry Numerical Approaches for Noise Predicting and Attenuating of Rifle Shooting with Suppressors
The moving bullet out of a rifle barrel is propelled by a fired explosive charge. Subsequently, a disturbed muzzle blast wave is initiated which lasts several milliseconds. In this study, axially symmetric, unsteady, Large Eddy Simulation (LES), and Ffowcs Williams and Hawkins (FWH) equations were s...
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| Format: | Article |
| Language: | English |
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Wiley
2011-01-01
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| Series: | Journal of Applied Mathematics |
| Online Access: | http://dx.doi.org/10.1155/2011/961457 |
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| author | Shi-Wei Lo Chang-Hsien Tai Jyh-Tong Teng |
| author_facet | Shi-Wei Lo Chang-Hsien Tai Jyh-Tong Teng |
| author_sort | Shi-Wei Lo |
| collection | DOAJ |
| description | The moving bullet out of a rifle barrel is propelled by a fired explosive charge. Subsequently, a disturbed muzzle blast wave is initiated which lasts several milliseconds. In this study, axially symmetric, unsteady, Large Eddy Simulation (LES), and Ffowcs Williams and Hawkins (FWH) equations were solved by the implicit-time formulation. For the spatial discretization, second order upwind scheme was employed. In addition, dynamic mesh model was used to where the ballistic domain changed with time due to the motion of bullet. Results obtained for muzzle flow field and for noise recorded were compared with those obtained from experimental data; these two batches of results were in agreement. Five cases of gunshot including one model of an unsuppressed rifle and four models of suppressors were simulated. Besides, serial images of species distributions and velocity vectors-pressure contours in suppressors and near muzzle field were displayed. The sound pressure levels (dB) in far field that were post-processed by the fast Fourier transform (FFT) were compared. The proposed physical model and the numerical simulations used in the present work are expected to be extended to solve other shooting weapon problems with three-dimensional and complex geometries. |
| format | Article |
| id | doaj-art-1d52e40860fc40a5b7a9d558e9a9db22 |
| institution | Kabale University |
| issn | 1110-757X 1687-0042 |
| language | English |
| publishDate | 2011-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Applied Mathematics |
| spelling | doaj-art-1d52e40860fc40a5b7a9d558e9a9db222025-02-03T01:27:09ZengWileyJournal of Applied Mathematics1110-757X1687-00422011-01-01201110.1155/2011/961457961457Axial-Symmetry Numerical Approaches for Noise Predicting and Attenuating of Rifle Shooting with SuppressorsShi-Wei Lo0Chang-Hsien Tai1Jyh-Tong Teng2Department of Vehicle Engineering, National Pingtung University of Science and Technology, Pingtung 91201, TaiwanDepartment of Vehicle Engineering, National Pingtung University of Science and Technology, Pingtung 91201, TaiwanDepartment of Mechanical Engineering, Chung Yuan Christian University, Chung-Li 32023, TaiwanThe moving bullet out of a rifle barrel is propelled by a fired explosive charge. Subsequently, a disturbed muzzle blast wave is initiated which lasts several milliseconds. In this study, axially symmetric, unsteady, Large Eddy Simulation (LES), and Ffowcs Williams and Hawkins (FWH) equations were solved by the implicit-time formulation. For the spatial discretization, second order upwind scheme was employed. In addition, dynamic mesh model was used to where the ballistic domain changed with time due to the motion of bullet. Results obtained for muzzle flow field and for noise recorded were compared with those obtained from experimental data; these two batches of results were in agreement. Five cases of gunshot including one model of an unsuppressed rifle and four models of suppressors were simulated. Besides, serial images of species distributions and velocity vectors-pressure contours in suppressors and near muzzle field were displayed. The sound pressure levels (dB) in far field that were post-processed by the fast Fourier transform (FFT) were compared. The proposed physical model and the numerical simulations used in the present work are expected to be extended to solve other shooting weapon problems with three-dimensional and complex geometries.http://dx.doi.org/10.1155/2011/961457 |
| spellingShingle | Shi-Wei Lo Chang-Hsien Tai Jyh-Tong Teng Axial-Symmetry Numerical Approaches for Noise Predicting and Attenuating of Rifle Shooting with Suppressors Journal of Applied Mathematics |
| title | Axial-Symmetry Numerical Approaches for Noise Predicting and Attenuating of Rifle Shooting with Suppressors |
| title_full | Axial-Symmetry Numerical Approaches for Noise Predicting and Attenuating of Rifle Shooting with Suppressors |
| title_fullStr | Axial-Symmetry Numerical Approaches for Noise Predicting and Attenuating of Rifle Shooting with Suppressors |
| title_full_unstemmed | Axial-Symmetry Numerical Approaches for Noise Predicting and Attenuating of Rifle Shooting with Suppressors |
| title_short | Axial-Symmetry Numerical Approaches for Noise Predicting and Attenuating of Rifle Shooting with Suppressors |
| title_sort | axial symmetry numerical approaches for noise predicting and attenuating of rifle shooting with suppressors |
| url | http://dx.doi.org/10.1155/2011/961457 |
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