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| Titel: |
Response of Periodically Stiffened Shells to a Moving Projectile Propelled by an Internal Pressure Wave |
| Auteur: |
Ruzzene, M. Baz, A. |
| Verschenen in: |
Mechanics of advanced materials & structures |
| Paginering: | Jaargang 13 (2006) nr. 3 pagina's 267-284 |
| Jaar: |
2006-07-01 |
| Inhoud: |
The vibrations of cylindrical shells induced by a moving projectile propelled by an internal pressure wave are controlled by placing stiffening rings periodically along the length of the shell. An expanding pressure step causes the axisymmetric radial displacement of the shell to be several times higher than that produced by the static application of the same pressure. The displacement depends on the velocity of the pressure front and a critical velocity at which its amplitude is maximized can be identified. The critical velocity corresponds to the minimum velocity at which waves propagate along the shell. In addition, the mass of the projectile induces bending vibrations whose magnitude is of the same order of the axisymmetric deformation caused by the pressure step. The shell's response is therefore given by the combination of rotationally symmetric and bending motions, which are coupled by the interaction between the moving projectile, the internal pressure and the shell vibrations. A Finite Element model is developed to predict the transient response of stiffened cylindrical shells loaded by a moving projectile propelled by an internal pressure wave. The model is formulated to account for the interaction between moving mass, internal pressure and shell vibration and to capture the resulting coupling between bending and rotationally symmetric response. The model is used to identify the configuration for the stiffening rings that impedes the propagation of waves at critical speed and hence increases the critical velocity and reduces the radial displacement at critical conditions. The design of the stiffened configuration is guided by previous analyses on the steady-state axisymmetric response of the shell. Numerical simulations prove the effectiveness of the identified configuration both in increasing the critical velocity and in reducing the amplitude of the corresponding maximum displacement. The results also demonstrate the capability of periodically stiffened shells of reducing bending vibrations and therefore of stabilizing the overall shell response, before and after the projectile leaves the shell. The presented analysis provides guidelines for the design of gun barrels with increased firing velocity, improved accuracy, and enhanced structural stability. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 5 van 5 gevonden artikelen
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