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23rd April 2015, 08:21 |
#1
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Banned
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[sosbud bangett..] mana yg lbih bagus..?
Wuss, Jepang Punya Kereta Tercepat Dunia Berkecepatan 603 Km/Jam
akarta -Soal kereta cepat sekelas 'Shinkansen' di Jepang, Indonesia baru sekadar wacana. Sementara di Jepang, negara asal 'Shinkansen', sudah ada kereta cepat yang menembus rekor baru kecepatan di dunia. Berbeda dengan Shinkansen, kereta cepat ini yang menggunakan teknologi maglev. Ini merupakan sistem magnet, sehingga mengambang di atas rel ini, kecepatannya menembus 603 km/jam. Kereta tercepat ini baru diuji coba di dekat Gunung Fuji. Sebelumnya, kereta ini hanya mencapai 590 km/jam, dalam uji coba sebelumnya pada pekan lalu. Central Japan Railway (JR Central), selaku pemilik kereta cepat ini, akan menggunakan kereta ini untuk rute Tokyo dan Nagoya pada 2027. Menggunakan kereta secepat ini, Tokyo-Nagoya sejauh 280 km ditempuh hanya dengan waktu 40 menit. Namun sayang, penumpang tidak akan merasakan pengalaman dengan kecepatan 603 km/jam, karena kereta ini akan hanya akan dioperasikan maksimum 505 km/jam. Kereta ini tetap lebih cepat dari Shinkansen yang saat ini 320 km/jam. Dilansir dari BBC, Kamis (23/4/2015), konstruksi kereta ini akan menghabiskan US$ 100 miliar, atau sekitar Rp 13 triliun. Ada sejumlah terowongan yang dibangun untuk rute tersebut. Targetnya, dengan jalur baru kereta cepat ini, pada 2045, waktu tempuh Tokyo-Osaka bisa dilakukan hanya 1 jam. "Makin cepat kereta ini lari, makin stabil pergerakannya," kata Kepala Riset JR Central, Yasukazu Endo. Jepang selama ini terkenal dengan Shinkansen, yang berlari di atas rel baja. Namun sekarang, Jepang mengembangkan teknologi maglev (magnetic levitation) yang diharapkan bisa dijual ke luar negeri. Perdana Menteri Jepang, Shinzo Abe baru-baru ini berkunjung ke Amerika Serikat (AS), dan menawarkan pembangunan kereta cepat antara New York ke Washington. (dnl/ang) |
23rd April 2015, 08:22 |
#2
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Banned
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When the California high speed rail was approved, I was quite disappointed, as I know many others were too. How could it be that the home of Silicon Valley and JPL doing incredible things like indexing all the worlds knowledge and putting rovers on Mars would build a bullet train that is both one of the most expensive per mile and one of the slowest in the world? Note, I am hedging my statement slightly by saying one of. The head of the California high speed rail project called me to complain that it wasnt the very slowest bullet train nor the very most expensive per mile.
The underlying motive for a statewide mass transit system is a good one. It would be great to have an alternative to flying or driving, but obviously only if it is actually better than flying or driving. The train in question would be both slower, more expensive to operate (if unsubsidized) and less safe by two orders of magnitude than flying, so why would anyone use it? If we are to make a massive investment in a new transportation system, then the return should by rights be equally massive. Compared to the alternatives, it should ideally be: Safer Faster Lower cost More convenient Immune to weather Sustainably self-powering Resistant to Earthquakes Not disruptive to those along the route Is there truly a new mode of transport a fifth mode after planes, trains, cars and boats that meets those criteria and is practical to implement? Many ideas for a system with most of those properties have been proposed and should be acknowledged, reaching as far back as Robert Goddards to proposals in recent decades by the Rand Corporation and ET3. Unfortunately, none of these have panned out. As things stand today, there is not even a short distance demonstration system operating in test pilot mode anywhere in the world, let alone something that is robust enough for public transit. They all possess, it would seem, one or more fatal flaws that prevent them from coming to fruition. Constraining the Problem The Hyperloop (or something similar) is, in my opinion, the right solution for the specific case of high traffic city pairs that are less than about 1500 km or 900 miles apart. Around that inflection point, I suspect that supersonic air travel ends up being faster and cheaper. With a high enough altitude and the right geometry, the sonic boom noise on the ground would be no louder than current airliners, so that isnt a showstopper. Also, a quiet supersonic plane immediately solves every long distance city pair without the need for a vast new worldwide infrastructure. However, for a sub several hundred mile journey, having a supersonic plane is rather pointless, as you would spend almost all your time slowly ascending and descending and very little time at cruise speed. In order to go fast, you need to be at high altitude where the air density drops exponentially, as air at sea level becomes as thick as molasses (not literally, but you get the picture) as you approach sonic velocit |
23rd April 2015, 08:24 |
#4
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Banned
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dan tdk perlu ke luar negri lagi klo mau mrasakan ttransportasi massal yg asik punya...
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23rd April 2015, 08:26 |
#5
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Groupie Member
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kejauhan itu, klo ane sih pengin di tempat ane jalan raya mulus semua dulu
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Join Us |
23rd April 2015, 10:46 |
#10
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Groupie Member
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Quote:
http://forum.detik.com/showthread.php?p=23730504 |
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