Displacement Response of Inverse Flight with Dynamic Force and Soft Landing in Solid Rocket Under Half Sinusoidal Wave Impulse Shock

Aiming at the problem that current displacement response of solid rocket has not been completely solved, the displacement response of solid rocket is deduced from Duhamel convolutional definite integral on the retardation time. The displacement shock spectrum and minimum happening time are obtained after the displacement response and happening time of rocket in inverse flight with dynamic force and soft landing are compared. The research results show that the dimensionless rocket displacement response cannot permanently be equal to zero in inverse flight stage with dynamic force, but in soft landing stage, this phenomenon may occur. The maximum rocket displacement response happens in soft landing stage after shock action when shock impulse duration is relatively short, and it happens in inverse flight stage with dynamic force during shock action when the shock impulse duration is relatively long. When rocket displacement achieves the maximum value, the corresponding happening time is not sole and there are several happening times making displacement attain the maximum value. The relative error between the calculating result of rocket displacement response's maximum value and the experimental data is in the range of -9%-7%. The relative error between the calculating result of happening time of rocket displacement's maximum value and experimental data is in the range of -6%-8%. © 2021, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.