In bimetallic thermometers a defined bending or change in the curvature of a bimetallic strip is brought about by a change in temperature.

While structure damage is reflected by the change of stiffness. Sothe curvature may detect the damage of structure.

Based on results, the geometrical asymmetry shell has obvious effect about reducing noise in large range of frequencies, and change radius of curvature can increase eigenfrequency obviously.