Physics:skyTran

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Artist's rendering of the proposed skytran design

skyTran is a personal rapid transit system concept first proposed by inventor Douglas Malewicki in 1990, and under development by Unimodal Inc. A prototype of the skyTran vehicle and a section of track have been constructed. The early magnetic levitation system, Inductrack, which SkyTran has replaced with a similar proprietary design, has been tested by General Atomics with a full-scale model.[1] In 2010, Unimodal signed an agreement with NASA to test and develop skyTran.[2] skyTran has proposed additional projects in France, Germany, India, Indonesia, Malaysia, the United Kingdom, and the United States.[3][4][5][6]

System details

To minimize maintenance and make switching on and off the tracks efficient at high speeds, early versions of the system proposed using the Inductrack passive magnetic levitation system instead of wheels. Passive maglev requires no external power to levitate vehicles. Rather, the magnetic repulsion is produced by the movement of the vehicle over shorted wire coils in the track.[1] The cars would be driven by a linear motor in the track or vehicle. Therefore, the system will have very few moving parts; primarily just the vehicle itself moving along the track, its parking wheels and door, and fans in heating and air conditioning units; so its promoters refer to the system as "solid state".[7]

On this first version, the passive maglev coils are enclosed and supported by a light shell called a guideway that also captures the vehicles mechanically to prevent derailment. Malewicki proposes a 3D grid design that avoids accident-prone intersections by grade separation, with guideways and their exit and entry ramps crossing above or below each other. Tracks will be supported 20 or 30 feet (6 or 9 m) above the ground by standard metal utility poles. They could also be attached to the sides of buildings.

After identifying problems with Inductrack and the cost associated with it, skyTran described an improved design during a Horizon BBC interview with skyTran at NASA Ames in Mountain View, CA.

New details about the levitation and motor were described in a keynote speech in June 2016, showing levitation stator being plain aluminium plates and motor stator an aluminium tube. The guideway is also significantly enlarged and wider than the vehicle, so the switching can be vertical, going through the guideway. Guideway shape is shown at 16:26 in above referenced video. This new concept can be seen in a short simulation film[|permanent dead link|dead link}}]. Instead of the purely passive inductrack system, the new mechanism modify lift by mechanically angling the magnetic pads and need a servo controlled actuation. The lift control also do the switching by moving vertically through the rails.

Patents applications were filed by skytran for this new system: US patent application 20150329010 and US patent application 20140130703

History

Malewicki conceived the basic idea of skyTran in 1990, filing a US patent application that year that was granted as US Patent #5108052 in 1992.[8] He published several technical papers on skyTran in the following years. In 1991, he presented a paper entitled "People Pods - Miniature Magnetic Levitation Vehicles for Personal Non-Stop Transportation" to the Society of Automotive Engineers (SAE) Future Transportation Conference in Portland, Oregon.[9] The paper is a thorough description of the concept at that point, although some important features of the current skyTran design are only discussed as options, including magnetic levitation rather than wheels and hanging below the guideway instead of riding above it.

The paper describes how Malewicki had built and driven a freeway-legal 154-MPG car in 1981, but realized it could never be safe on a street surrounded by far larger and heavier vehicles. Elevated tracks would allow a very light vehicle to be safe. They are also basic to the system's inexpensiveness, because there is no need to acquire a huge right of way and tear down buildings. It presents an aerodynamic analysis (Malewicki is an aerospace engineer) supporting claims of very high energy efficiency (the paper claims 407 mpg‑US or 489 mpg‑imp or 0.578 L/100 km for skyTran's current two-passenger tandem design, though the Unimodal site claims only, "over 200 mpg‑US or 240 mpg‑imp or 1.2 L/100 km").[10][11] It also described how a very light vehicle that can squeeze both surfaces of a track simultaneously could reliably achieve a 6-G deceleration, allowing it to brake safely to a stop from 100 miles per hour (161 km/h) in just 55 feet (16.76 m).[12]

The 2008 energy shortages stimulated renewed interest in green vehicle proposals such as skyTran. The "Maglev skyTran" topic quoted a number of skyTran and personal rapid transit ideas, such as passengers exiting and boarding at off-line elevated "portal" stops while high-speed traffic continues to speed by on its main line.[13]

In September 2009, the US NASA (National Aeronautics and Space Administration) signed a Space Act joint development agreement with Unimodal. Unimodal has tested prototype vehicles on short guideway sections at NASA's Ames Research Center, in Mountain View, California. NASA control and vehicle dynamics simulation software was made available to Unimodal, which hired NASA subcontractors to program them using US DOT grant funding.[14]

In June 2014, Unimodal and Israel Aerospace Industries (IAI) contracted to build a 400-500 meter elevated loop test track on IAI's campus in central Israel. If the pilot project is successful, IAI will build a commercial skyTran network in the city of Tel Aviv, Herzliya and Netanya.[15][16] In April 2015, the Herzliya city council approved a budget for the skyTran project.[17]

In June 2016, skyTran signed a memorandum of understanding in the United Arab Emirates for the study and implementation of a personal rapid transit system in Yas Island.[18]

In 2018, it was announced that Indian conglomerate Reliance Industries had acquired a 12.7% stake in SkyTran through its subsidiary Reliance Strategic Business Ventures Limited. As part of the deal, Reliance would supply communication equipment and a prototype would be built in India.[19]

In April 2019, SkyTran signed a memorandum of understanding with Eilat to build an elevated rail system serving Ramon Airport.[20]

In June 2019 a memorandum of understanding was signed between skyTran and the Roads and Transport Authority (RTA) of Dubai in the United Arab Emirates to develop a Sky Pod suspended transit system.[21]

In February 2021, Reliance Industries increased its shareholding in skyTran to 54.46% with an additional investment of $26.76 million making Reliance Industries Limited the majority stakeholder in SkyTran.[22][23][24][25]


See also

References

  1. ↑ 1.0 1.1 Rennie, Gabriele. "Magnetically Levitate Train Takes Flight". http://www.llnl.gov/str/October04/Post.html. 
  2. ↑ "NASA Partners to Revolutionize Personal Transportation". September 2, 2009. http://www.nasa.gov/topics/nasalife/features/unimodal.html. Retrieved November 1, 2010. 
  3. ↑ Clawson, Trevor (October 23, 2014). "Sky Tran Targets Europe -- But Can It Beat The Bureaucracy". https://www.forbes.com/sites/trevorclawson/2014/10/23/sky-tran-targets-europe-but-can-it-beat-the-bureaucracy/. 
  4. ↑ "(untitled)". Archived from the original on June 24, 2015. https://web.archive.org/web/20150624155219/http://io9.com/this-futuristic-looking-mass-transit-system-is-really-h-950593364. 
  5. ↑ Kavilanz, Parija (October 23, 2015). "Sky taxis are about to become a reality". https://money.cnn.com/2015/10/23/smallbusiness/skytran-air-taxis/. 
  6. ↑ Rao, Meghna (September 2, 2015). "Can a network of levitating pods change how urban India travels?". https://www.techinasia.com/network-levitating-pods-change-urban-india-travels/. 
  7. ↑ "Solid state". Archived from the original on February 16, 2006. https://web.archive.org/web/20060216004602/http://www.aerowebspace.com/AIAA/archives/SkyTran.pdf. 
  8. ↑ Burke, Wallace R. (September 1, 1992). "Monorail vehicle". US Patent and Trademark Office. http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=D329028.PN.&OS=PN/D329028&RS=PN/D329028. Retrieved June 21, 2015. 
  9. ↑ Malewicki, Douglas J.; Baker, Frank J. (June 1991). People Pods - Miniature Magnetic Levitation Vehicles for Personal Non-Stop Transportation. Irvine California, USA: AeroVisions, Inc., and Monitoring Automation Systems. 
  10. ↑ People Pods. Table 2 "Performance Comparisons of Possible People Pod Concepts," page 5. 
  11. ↑ "Benefits -- Energy Efficient". Archived from the original on January 22, 2009. https://web.archive.org/web/20090122195758/http://www.unimodal.net/index.php?option=com_content&task=view&id=12&Itemid=37. 
  12. ↑ People Pods. Figure 7, "People Pod High 'g' Braking Capability," page 8. 
  13. ↑ "The Green MEGA CITY: An eco-savvy blueprint for tomorrow's megacity that points the way to fresh air, clean water and traffic that never jams -- Transportation -- Maglev skyTran". Popular Science Magazine. June 13, 2008. http://www.popsci.com/futurecity/plan.html. Retrieved June 20, 2015. 
  14. ↑ Marlaire, Ruth (September 2, 2009). "NASA Partners to Revolutionize Personal Transportation". Ames Research Center, Moffett Field, Calif.. http://www.nasa.gov/topics/nasalife/features/unimodal.html. Retrieved June 21, 2015. 
  15. ↑ Rabinovitch, Ari (June 24, 2014). "Israel's largest defense company to build world's first elevated transit network in Israel". Haaretz. http://www.haaretz.com/news/national/1.600947. Retrieved July 19, 2014. 
  16. ↑ Winer, Stuart (June 24, 2014). "Futuristic skytrain track to be built near Tel Aviv". The Times of Israel. http://www.timesofisrael.com/futuristic-skytrain-track-to-be-built-near-tel-aviv/. Retrieved July 19, 2014. 
  17. ↑ "Herzliya plans elevated rapid transport system - Globes". 20 April 2015. https://en.globes.co.il/en/-did-1001029690. 
  18. ↑ "skyTran is coming to Yas Island". June 29, 2016. https://whatson.ae/abudhabi/2016/06/skytran-coming-to-yas-island/. 
  19. ↑ Sood, Jyotika (22 October 2018). "Reliance to decide site to build India’s first pod taxi prototype". Mint. https://www.livemint.com/Companies/hytTPYEz6bdKapWUG2gPeO/Reliance-to-decide-site-to-build-Indias-first-pod-taxi-prot.html. Retrieved 27 October 2018. 
  20. ↑ Solomon, Shoshanna. "Eilat inks deal with skyTran, taking step toward futuristic pod transport system". https://www.timesofisrael.com/eilat-inks-deal-with-skytran-taking-step-toward-futuristic-pod-transport-system/. 
  21. ↑ "Dubai signs deal on high speed skytrain". June 10, 2019. http://www.dubaiweek.ae/news/51101/dubai-skytrain-deal/. 
  22. ↑ "RIL Subsidiary Acquires Additional Stake In SkyTran; Share Price Gains". https://www.moneycontrol.com/news/business/stocks/ril-subsidiary-acquires-additional-stake-in-skytran-share-price-gains-6585961.html. 
  23. ↑ "RIL Acquires Majority Equity Stake In SkyTran". https://www.moneycontrol.com/news/business/ril-acquires-majority-equity-stake-in-skytran-6585731.html. 
  24. ↑ Team, BS Web (28 February 2021). "RIL buys majority stake in skyTran; invested in future tech, says Ambani". https://www.business-standard.com/article/companies/ril-arm-acquires-majority-stake-in-us-tech-firm-skytran-for-27-mn-121022800740_1.html. 
  25. ↑ Prasad, Rachita. "Reliance Industries ups stake in skyTran Inc to 54.46% for $26.76 million". The Economic Times. https://economictimes.indiatimes.com/news/company/corporate-trends/reliance-industries-ups-stake-in-skytran-inc-to-54-46-for-26-76-million/articleshow/81260240.cms. 

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