構造変更に影響されない仮想加振源の同定と騒音低減化設計への応用

抄録

In the case that unknown force excites the vibrating structure, the virtual exciting forces at any points are calculated from a number of measured accelerations on structure in the condition that actual vibration state is the same. In that the sound radiation power caused by the virtual exciting forces is set as an objective function, the noise reduction design is performed. In that time, the excitation sources of the virtual exciting forces are modeled and the parameters of excitation source model are identified from change in the measured accelerations in the case of structure change caused by added mass and stiffness. Identified parameters of the excitation source enable the structural optimization to reduce the radiated noise considering the change in the virtual exciting force caused by the structural change. For example, proposed method is applied to the optimal rib location enables to reduce noise in the case that the cantilever rectangular plate is excited by a lumped exciting force.