[en] Analytical capabilities for fluid-solid situations are in the process of being developed. However, since the overall phenomenon of fluid-solid interaction is not thoroughly understood, it was the objective of this study to develop and carry out an experimental program which would provide additional insight into the mechanics of fluid-solid interaction. Since one of the primary components in a nuclear power system is the reactor vessel and the thermal liner, the experimental study described in this work was limited to the response of a set of coaxial cylinders with water in the annulus. The effects of cylinder thickness and the fluid filled annulus gap size on the resonant frequencies and mode shapes of the cylinders are presented; also included is an evaluation of damping for selected gaps and cylinder thicknesses. Details of the experimental setup and procedures are also outlined