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

<div>Least-squares fitting of the 1st-order modal parameters versus amplitude: POD (svd) method. (a) Natural frequency in air. (b) Damping ratio in air. (c) Natural frequency in still water. (d) Damping ratio in still water.</div>

Science and Technology of Nuclear Installations

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Figure 22

Figure 22: A New Experimental Method for the Nonlinear Modal Parameter Identification of a Pressurized Water Reactor Fuel Assembly 