To provide a forefront part structure of a movable body capable of exhibiting a reduction effect of a micro atmospheric pressure wave even if there is a step part in a forefront part of the movable body.SOLUTION: A forefront part structure 7 has a structure having micro atmospheric pressure wave reduction performance which can reduce a micro atmospheric pressure wave that is generated when a vehicle 2 having a step part 5C in a forefront part 5A plunges into a tunnel. A forefront part shape S has at least three peaks P1 to P3 in a cross sectional area rate-of-change distribution dA*/dX of the forefront part 5A of the vehicle 2, and the step part 5C is present in the peaks P1 to P3. The forefront part shape S has the peaks P1 to P3 of the cross sectional area rate-of-change distribution dA*/dX at a forefront part tip 5a, a forefront part intermediate part 5b and a forefront part rear end 5c of the forefront part 5A of the vehicle 2, and the step part 5C is present between the peak P1 of the forefront part tip 5a and the peak P2 of the forefront part intermediate part 5b. The step part 5C is formed in the forefront part 5A when the forefront part 5A is drawn.SELECTED DRAWING: Figure 5
【課題】移動体の先頭部に段差部が存在しても微気圧波の低減効果を発揮することができる移動体の先頭部構造を提供する。【解決手段】先頭部構造7は、先頭部5Aに段差部5Cを有する車両2がトンネル内に突入するときに発生する微気圧波を低減可能な微気圧波低減性能を有する構造である。先頭部形状Sは、車両2の先頭部5Aの断面積変化率分布dA*/dXに少なくとも3つのピークP1〜P3があり、段差部5Cはピーク間P1〜P3に存在する。先頭部形状Sは、例えば、車両2の先頭部5Aの先頭部先端5a、先頭部中間5b及び先頭部後端5cに断面積変化率分布dA*/dXのピークP1〜P3があり、段差部5Cは先頭部先端5aのピークP1と先頭部中間5bのピークP2との間に存在する。段差部5Cは、先頭部5Aを延伸させたときに、この先頭部5Aに形成される。【選択図】図5
FOREFRONT PART STRUCTURE OF MOVABLE BODY
移動体の先頭部構造
2021-09-24
Patent
Electronic Resource
Japanese
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