구조기구조기인 아이들 소음 저감을 위한 차체 골격 내 복합체 삽입 최적설계

As a matter of fact, it has been difficult to modify the shape of vehicle body skeletons since the technical definition for a global body structure was fixed and the corresponding molds were developed. By the way, if it is available to apply an alternative to reinforce the skeletons without changing their molds, it will be more flexible to improve the performance qualities relevant to crash, durability and NVH(Noise, Vibration and Harshness). Recently, a solution with the composite body becomes available for the purpose. We present an optimal design method to insert the composite bodies into a vehicle body skeleton in order to improve the structure-borne noise at the idle condition. The algorithms, topology optimization and gradient based optimization, are applied to mainly search the sensitive structural joints in the body skeleton and to extract the technical definition of composite body insertions. Inserting the composite bodies into the sensitive joints, it is predicted to achieve the countermeasure which can meet the design availability in terms of the idle noise and the weight. According to the validation result with test vehicles, the concerned noise transfer function is reduced and the idle booming noise is resultantly improved.