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商品名 Product |
新幹線車両 N700系 Shinkansen Rolling Stock Series N700 |
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| 製造会社・出展協力 Manufacture |
東海旅客鉄道株式会社・西日本旅客鉄道株式会社 Central Japan Railway Company・West Japan Railway Company |
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| デザイナー Designer |
東海旅客鉄道株式会社・西日本旅客鉄道株式会社・
トランスポーテーションデザイン機構 Central Japan Railway Company,West Japan Railway Company, Transportation Design Organization |
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N700は700系のリファインと見られがちだが、その内容は革新的だ。何よりも高速車両における環境性能と快適性が高次元で両立している。例えば新幹線の線路脇で走行音を聞いてみると、N700は700系に比べはるかに静かで滑るように走って来る。これは先頭車両の空気抵抗低減のための3次元切削によるノーズ内面加工や、車体各部の軽量化・車両間の連結部全周幌など、積極的な低騒音対策が効果を発揮している。空力音は速度の6乗に比例するため技術的な困難が伴うが、JR東海は小牧市に低騒音風洞を作り空力音低減の実験を繰り返した成果である。乗車してみても振動が少なく室内も静かであることが実感できる。またN700の先頭車は700系に比べエッジの立った印象を受けるがこれはエアロダブルウイングと呼ばれ、車体の表面を流れる気流が境界面剥離を起こさないように、なめらかに後方に導くためと最後尾車両が起こすカルマン渦を防ぐ手段で、最後尾の横揺れ低減にも効果がある。運転席の横幅削減も飛行機の垂直尾翼的なスタビライザー効果を上げている。車両デザインが空力性能に左右されながらもひとつの顔として練り上がられて行く課程をN700は私たちに見せていてくれる。
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（解説／上田 幸和) 2007年7月発売 |
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| The < N700 > is often seen as a refined version of the 700-model, but its design is revolutionary. Above all, there is a high level of consistency between environmental performance and convenience. For example, when comparing the noise level of the < N700 > and the 700-model at the tracks, the noise level of the < N700 > is much lower. This is due to several positive noise reduction measures, such as the modification of the nose of the train to reduce air resistance, the weight reduction of the carriages and the complete covering of the coupling between the carriages. Noise due to air resistance is proportional to the 6th power of speed and is technically complicated, but JR Tokai built a low noise wind tunnel in the city of Komaki. They repeatedly performed tests to reduce noise cause by air resistance, and so a noise-reduced service was achieved. Riding the train, one experiences reduced vibration and the low noise level in the compartments. The front car of the < N700 > appears to have more edges than the 700-model. These edges are called "Aero Double Wings," and they prevent surface ablation by guiding the air smoothly to the back. This also prevents the last car from causing a Karman Vortex, reducing sideways motion of the car. Reducing the width of the cab also improved the stability, similar to the effect a vertical tail of an airplane has. The < N700 > shows us how the design of a train integrated insights from aerodynamics into a final design. | ||||||||||||||||||||||||||||||||
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(Commentary / Yukikazu Ueda)
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