Regularization Algorithms for the Stress-Wave Force Balance Technique

With elevated interest in low-cost ground-test facilities, impulsive tunnels (Ludwieg tubes, shock tunnels, etc.) have become an increasingly popular avenue for hypersonic research. These facilities require responsive, novel approaches to measure forces and moments. The Stress-Wave Force Balance Technique (SWFBT) provides an appealing option. To verify the SWFBT, forces and strains were simulated on a 1D rod using COMSOL. Since the SWFBT requires two unique deconvolutions, the algorithm chosen to solve this ill-posed problem significantly influences the recovered force or moment. This work aims to advance the SWFBT via application of improved deconvolution algorithms from outside the field of aerospace engineering to this unique problem. Future work is planned to study the SWFBT with data acquired experimentally in a shock tunnel and in a Mach 6 Ludweig tube to investigate the maximum viable run-time where SWFBT applies.