| چکیده انگلیسی مقاله |
Almost every guns produce high speed and great pressure muzzle blast when they start to shoot. They also damage surrounded structures in their vicinity. In heavy weapons with high frequency of firing, the structure around the gun is incurred under the regular impacts of blast waves. On the other hand, these waves can also negatively impress crews, so their efficiency would be reduced. In this paper, a model of muzzle blast is revealed with the aid of scaling approach, and the traits are estimated with the aid of Friedlander wave form. Blast arrival time, maximum pressure, and positive phase duration are used to describe the muzzle blast. In the case of arrival time, Semi-experimental methods are also utilized. Solution of the reflected pressure at low angles has done with the Oblique Shock Theory, and at the bigger angles experimental methods along with Lagrangian Interpolation is utilized. The equations are attained within two ranges of distances. First: 10 to 50 times of barrel diameter, second is 50 to 400 times of the barrel diameter. The results are also validated with the experimental data from a30 mmcaliber gun and a105 mmcaliber tank. Results of arrival time and reflected pressure are appropriately efficient, and Positive Time Duration although shows a little more error from the experimental error, has half error in compare with the last theory. Almost every guns produce high speed and great pressure muzzle blast when they start to shoot. They also damage surrounded structures in their vicinity. In heavy weapons with high frequency of firing, the structure around the gun is incurred under the regular impacts of blast waves. On the other hand, these waves can also negatively impress crews, so their efficiency would be reduced. In this paper, a model of muzzle blast is revealed with the aid of scaling approach, and the traits are estimated with the aid of Friedlander wave form. Blast arrival time, maximum pressure, and positive phase duration are used to describe the muzzle blast. In the case of arrival time, Semi-experimental methods are also utilized. Solution of the reflected pressure at low angles has done with the Oblique Shock Theory, and at the bigger angles experimental methods along with Lagrangian Interpolation is utilized. The equations are attained within two ranges of distances. First: 10 to 50 times of barrel diameter, second is 50 to 400 times of the barrel diameter. The results are also validated with the experimental data from a30 mmcaliber gun and a105 mmcaliber tank. Results of arrival time and reflected pressure are appropriately efficient, and Positive Time Duration although shows a little more error from the experimental error, has half error in compare with the last theory. Almost every guns produce high speed and great pressure muzzle blast when they start to shoot. They also damage surrounded structures in their vicinity. In heavy weapons with high frequency of firing, the structure around the gun is incurred under the regular impacts of blast waves. On the other hand, these waves can also negatively impress crews, so their efficiency would be reduced. In this paper, a model of muzzle blast is revealed with the aid of scaling approach, and the traits are estimated with the aid of Friedlander wave form. Blast arrival time, maximum pressure, and positive phase duration are used to describe the muzzle blast. In the case of arrival time, Semi-experimental methods are also utilized. Solution of the reflected pressure at low angles has done with the Oblique Shock Theory, and at the bigger angles experimental methods along with Lagrangian Interpolation is utilized. The equations are attained within two ranges of distances. First: 10 to 50 times of barrel diameter, second is 50 to 400 times of the barrel diameter. The results are also validated with the experimental data from a30 mmcaliber gun and a105 mmcaliber tank. Results of arrival time and reflected pressure are appropriately efficient, and Positive Time Duration although shows a little more error from the experimental error, has half error in compare with the last theory. Almost every guns produce high speed and great pressure muzzle blast when they start to shoot. They also damage surrounded structures in their vicinity. In heavy weapons with high frequency of firing, the structure around the gun is incurred under the regular impacts of blast waves. On the other hand, these waves can also negatively impress crews, so their efficiency would be reduced. In this paper, a model of muzzle blast is revealed with the aid of scaling approach, and the traits are estimated with the aid of Friedlander wave form. Blast arrival time, maximum pressure, and positive phase duration are used to describe the muzzle blast. In the case of arrival time, Semi-experimental methods are also utilized. Solution of the reflected pressure at low angles has done with the Oblique Shock Theory, and at the bigger angles experimental methods along with Lagrangian Interpolation is utilized. The equations are attained within two ranges of distances. First: 10 to 50 times of barrel diameter, second is 50 to 400 times of the barrel diameter. The results are also validated with the experimental data from a30 mmcaliber gun and a105 mmcaliber tank. Results of arrival time and reflected pressure are appropriately efficient, and Positive Time Duration although shows a little more error from the experimental error, has half error in compare with the last theory. |