音響モーダル法による構造-音響連成系解析 : MRIの音場解析

抄録

The finite-element method (FEM) is often used for acoustic field analysis in closed spaces. It enables users to solve complex acoustic problems in which acoustic fields of inner spaces are coupled with surrounding structures. In simple-shaped structures, however, the acoustic modal analysis method is more suitable than FEM from the standpoints of simplicity and interpretation of the results. The authors applied this method to the noise problem in a magnetic resonance imaging system (MRI). The MRI has been used for medical diagnostics in recent years. Structural design for noise reduction in the MRI is desired as considerable noise is generated in operation. This paper describes the modeling method of structure-acoustic coupled system of MRI. Theoretical predictions were compared with experimental results, and good agreement was obtained up to the frequencies in which the modeling condition was satisfied.