To provide a forefront part structure of a movable body which can further improve the effect of reducing microbarometric waves.SOLUTION: A forefront part structure 6 has microbarometric wave reduction performance that can reduce microbarometric waves generated when a vehicle 2 enters a tunnel. A forefront part shape S of the forefront part structure 6 is optimized since it is assumed to have a plurality of peaks in cross sectional area change rate. With respect to the forefront part shape S as shown in the figure (A), the cross sectional area change rate dA/dX is represented by combination of predetermined numbers (for example, 10 numerical values) of error functions, and the values of peaks Pto Pof the cross sectional area change rate dA/dX, and the position and the spread thereof are optimized as optimum parameters. With respect to the forefront part shape S, there are at least three peaks Pto Pin the cross sectional area change rate distribution dA/dX of the forefront part 5A of the vehicle 2. As shown in the figure (A), the forefront part shape S has the peaks Pto Pof the cross sectional area change rate distribution dA/dX in a forefront part tip 5a, a forefront part intermediate 5b, and a forefront part rear end 5c.SELECTED DRAWING: Figure 1
【課題】微気圧波の低減効果をより一層向上させ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6は、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。先頭部構造6は、複数の断面積変化率のピークを持つことを仮定して先頭部形状Sが最適化されている。(A)に示す先頭部形状Sは、所定の個数(例えば、10個)の誤差関数の組み合わせによって断面積変化率dA/dXを表現し、断面積変化率dA/dXのピークP1〜P3の大きさ、位置及び広がりを最適パラメータとして最適化されている。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がある。 先頭部形状Sは、(A)に示すように、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がある。【選択図】図1
FOREFRONT PART STRUCTURE OF MOVABLE BODY
移動体の先頭部構造
2019-11-21
Patent
Electronic Resource
Japanese
IPC: | B61D Einzelheiten oder Arten des Wagenaufbaus von Eisenbahnfahrzeugen , BODY DETAILS OR KINDS OF RAILWAY VEHICLES |
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