A New Experimental Method for the Nonlinear Modal Parameter Identification of a Pressurized Water Reactor Fuel Assembly

Figure 13

Summary of the 1st-order natural frequency versus amplitude relationship and damping ratio versus amplitude relationship determined by the data reduction method. (a) Natural frequency: in air. (b) Damping ratio: in air. (c) Natural frequency: in still water. (d) Damping ratio: in still water.

(a)

(b)

(c)

(d)