Experiments on the determination of immersed shell structure mobilities via scale modeling

Experiments were conducted to confirm scaling relations for structural frequency response functions as applied to immersed shell structures using same-material, same-liquid scale models. Accelerance (acceleration/force) frequency response, magnitude data were acquired for full-scale and half-scale versions of a fixed-free open cylinder mounted in a grid vessel. The data confirmed that corresponding frequencies in the model and prototype were in proportion to the inverse of the geometric scale. The peak accelerate magnitudes were normalized by damping to form quantities which should scale despite differences in the corresponding modal damping values