Automotive floor panel structure

摘要

The present invention is a floor panel structure of a car body where an automobile floor includes a floor panel that is connected to the frame members of the car body and also have a vibration mode adjusting structure that suppresses the generation of acoustic emission by generating 2x1 mode vibrations in a predetermined frequency band. The floor panel has a non-rectangular vibration region and the vibration mode adjusting structure of the floor panel has a vibration adjusting part that defines the position of node of 2x1 mode vibration, and this vibration adjusting part is disposed within the non-rectangular vibration region so as not to touch the frame members and so as to form two regions where the vibration volumes of two antinodes of vibration in 2x1 mode are made nearly the same.