Abstract
To reduce the span of automotive development a new optimum design method considering vibration properties is presented in this paper. It is important to have prospects for complex structures like automotive bodies having good vibration properties in the early stage of design. In order to accomplish this, hierarchical optimization of complex structures is investigated. The relationship between the substructure's natural frequencies and those of the whole structure is derived by using substructure synthesis approach. By the presented method natural frequencies of substructures are assigned to achive the certain natural frequencies of the whole structure.
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