Seismic Analysis of an Axial Blower using ANSYS

A seismic analysis is one of crucial design procedures of an axial blower used in nuclear power plants. The blower should withstand and operate under emergency situations such as earthquake. For the seismic analysis, we performed modal analysis and then evaluated Required Response Spectrum (RRS) from the given Floor Response Spectrum (FRS). Prior studies have been done similar to this method [1][2]. A finite element model of the blower is established by using commercial FEM software, ANSYS. After the finite element modeling, natural frequencies, mode shapes and the participation factors are obtained from the modal analysis. The RRS is acquired by numerical approach on the basis of the principle of mode superposition. We were able to verify the structural safety of the axial blower and confirmed the validity of the present seismic analysis results.

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