Semi-analytical method for calculating aeroelastic effect of profiled rod flying at high velocity

• Main Authors: Hui-jun Ning, Nan-peng Feng, Tan-hui Wu, Cheng Zhang, Hao Wang
• Format: Article
• Language: English
• Published: KeAi Communications Co., Ltd. 2015-03-01
• Series: Defence Technology
• Subjects: Profiled rod; Detonation process; Variable cross-section beam; Aeroelastic deformation; Numerical analysis
• Online Access: http://www.sciencedirect.com/science/article/pii/S2214914714001068

The key technique of a kinetic energy rod (KER) warhead is to control the flight attitude of rods. The rods are usually designed to different shapes. A new conceptual KER named profiled rod which has large L/D ratio is described in this paper. The elastic dynamic equations of this profiled rod flying at high velocity after detonation are set up on the basis of Euler-Bernoulli beam, and the aeroelastic deformation of profiled rod is calculated by semi-analytical method for calculating the vibration characteristics of variable cross-section beam. In addition, the aeroelastic deformation of the undeformed profiled rod and the aeroelastic deformation of deformed profiled rod which is caused by the detonation of explosive are simulated by computational fluid dynamic and finite element method (CFD/FEM), respectively. A satisfactory agreement of these two methods is obtained by the comparison of two methods. The results show that the semi-analytical method for calculating the vibration characteristics of variable cross-section beam is applied to analyze the aeroelastic deformation of profiled rod flying at high velocity.