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

<div>1st-order natural frequency versus amplitude relationship and damping ratio versus amplitude relationship: 20 mm test in still water. (a) Natural frequency. (b) Damping ratio.</div>

Science and Technology of Nuclear Installations

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Figure 11

Figure 11: A New Experimental Method for the Nonlinear Modal Parameter Identification of a Pressurized Water Reactor Fuel Assembly 