Volume 9, Issue 2, November 2014, Pages 511–522
Galal A. Hassaan1
1 Department of Mechanical Design & Production, Faculty of Engineering, Cairo University, Giza, Egypt
Original language: English
Copyright © 2014 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The objective of this paper is to investigate the dynamics of the barrel assembly-recoil mechanism of military cannons when using air springs and a constant damping coefficient hydraulic damper in their recoil mechanisms. The elastic characteristics of the air spring is nonlinear and the recoil mechanism orientation introduces extra nonlinearity to the dynamic model of the system. An extremely nonlinear model of the barrel assembly is derived and solved using Runge-Kutta 4 method to provide the dynamic response of the barrel assembly upon firing. The simulation results using the data of a Howitzer M114 cannon are presented for recoil mechanism orientation ? 50 degrees. The performance of the recoil mechanism is evaluated through the minimum and maximum displacements of the barrel assembly and the settling time of its response upon firing. The effect of the number of air springs on the performance of recoil mechanism is investigated. The analysis shows that it is possible with air springs to obtain barrel assembly response similar to that of a critically damped second-order system. It is possible with proper selection of the recoil assembly parameters to decrease the maximum barrel displacement to 54 mm and the settling time to less than 2 seconds.
Author Keywords: Cannon recoil mechanism, Barrel assembly dynamics, Air springs, Nonlinear dynamic model, Barrel response upon firing, Recoil mechanism performance.
Galal A. Hassaan1
1 Department of Mechanical Design & Production, Faculty of Engineering, Cairo University, Giza, Egypt
Original language: English
Copyright © 2014 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The objective of this paper is to investigate the dynamics of the barrel assembly-recoil mechanism of military cannons when using air springs and a constant damping coefficient hydraulic damper in their recoil mechanisms. The elastic characteristics of the air spring is nonlinear and the recoil mechanism orientation introduces extra nonlinearity to the dynamic model of the system. An extremely nonlinear model of the barrel assembly is derived and solved using Runge-Kutta 4 method to provide the dynamic response of the barrel assembly upon firing. The simulation results using the data of a Howitzer M114 cannon are presented for recoil mechanism orientation ? 50 degrees. The performance of the recoil mechanism is evaluated through the minimum and maximum displacements of the barrel assembly and the settling time of its response upon firing. The effect of the number of air springs on the performance of recoil mechanism is investigated. The analysis shows that it is possible with air springs to obtain barrel assembly response similar to that of a critically damped second-order system. It is possible with proper selection of the recoil assembly parameters to decrease the maximum barrel displacement to 54 mm and the settling time to less than 2 seconds.
Author Keywords: Cannon recoil mechanism, Barrel assembly dynamics, Air springs, Nonlinear dynamic model, Barrel response upon firing, Recoil mechanism performance.
How to Cite this Article
Galal A. Hassaan, “Dynamics of a Cannon Barrel-Recoil Mechanism with Nonlinear Air-Springs,” International Journal of Innovation and Applied Studies, vol. 9, no. 2, pp. 511–522, November 2014.
