(S1)Estimation of Virtual Exciting Source Not Affected by Sturacture Modification

In the structural optimization to reduce vibration, the exciting force should be measured or estimated. However, the exciting force may be changed by the change of stiffness due to structural modification. Thus, a novel quantity, virtual exciting source which is composed of pure exciting force which is not affected by structural modification and connecting vibration system is proposed and estimated by using the measured acceleration respose while adding small mass. Fr an example, the virtual exciting force of a cantilever plate excited by a shaker is estimated. The estimated acceleration response of a cantilever plate modified by adding a rainforced rib agrees well the measured one.
Fig.1   Fig.2
Examples of vibration modes with localized vibration amplitude Exaperimental appratus for vibration of folding beam

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