| 摘要 |
PROBLEM TO BE SOLVED: To reduce road noise caused by the cavity resonance of an automobile tire. SOLUTION: A floor is partitioned into a plurality of areas S1-S4 by a floor tunnel portion 11, side frames 13, side sills 12 and cross members 7, 8, 15, 16, and the rigidity of the floor panels of the areas S1-S3 is adjusted by rigidity adjustment portions 20, 21, 22, 23, and 25. These floor panels are set such that their natural frequency in a 2×1 mode, in which two antinodes are generated in the length direction of the automobile and one antinode is generated in the width direction of the automobile, is 240-260 Hz. COPYRIGHT: (C)2004,JPO
|
