Dynamic Response of a Hypersonic Rocket Sled Considering Friction and Wear

The dynamic response of a hypersonic rocket sled was studied by considering the time-varying friction coefficient and gap caused wear between slipper track. A multibody model for system established mass moment inertia, nonlinear aerodynamic loads, engine thrust, track irregularity, contact force. As calculation, ductile shear criteria were used as material damage criteria, determined number damaged elements. test also carried out, measured. results showed that computational sliding displacement velocity third-stage matched well with values. root mean square (RMS) values vertical acceleration front better than case without wear, which underestimated RMS value approximately 20.1% at Mach 5. importance correctness method validated. It is found kinetic decreased an increase in product pressure velocity. height increased almost linearly displacement. power spectral density time full frequency band below 2000 Hz. This study will guide design optimization sleds.