Ravichandran K.,University of Maryland University College |
Chopra I.,University of Maryland University College |
Wake B.E.,UTRC |
Hein B.,Sikorsky Aircraft
Journal of the American Helicopter Society | Year: 2013
The comprehensive analysis University ofMaryland Advanced Rotor Code (UMARC) was used to quantify the capabilities of trailing-edge flaps (TEFs) for helicopter vibration reduction and performance improvement. The rotor performance in hover was improved with a combination of torsionally softer blades and positive TEF deflections. Suitable combinations of lower harmonic TEF inputs were shown capable of reducing the rotor power requirement by about 4-5% at an advance ratio of μ=0.4. The TEF was shown to be capable of suppressing vibratory loads at a range of forward speeds, using half peak-to-peak deflections of about 5°-10°. Softening the blades in torsion resulted in larger flap actuation requirements for vibration reduction. A combination of 1, 2, 3, 4, and 5/rev TEF inputs resulted in a power reduction of 1.5%, while also reducing certain vibratory loads by more than 50% in high-speed forward flight. © 2013 The American Helicopter Society. Source
« ANGP gets exclusive license to UTRC technology for conformable natural gas vehicle storage tanks | Main | Study finds nanoparticle NMC material used in Li-ion batteries harms key soil bacterium » Changing the microstructure in magnesium alloys improves their corrosion resistance, and so improves the possibilities for the transport sector to use these materials to decrease the weight of vehicles, according to work done by Mohsen Esmaily, researcher in Atmospheric Corrosion at Chalmers University in Sweden. Magnesium is the lightest construction metal, but also the most reactive. This means that it is very sensitive to corrosion—i.e. it very easily reacts with its surroundings and rusts. This makes it difficult to use magnesium in corrosive environments, meaning that the potential to use magnesium in cars to make them lighter is limited. For more than a hundred years, magnesium producers have worked hard to improve the corrosion characteristics by developing new, more corrosion-resistant alloys, and also by developing various coatings. Mohsen Esmaily’s research shows a completely new way to improve the corrosion resistance of the alloys by manipulating the microstructure of the material, thereby increasing possibilities to lower the weight of vehicles. Studying magnesium casts produced through a casting method called rheocasting, Esmaily discovered that the corrosion resistance of magnesium alloys produced this way was up to four times better than the same material when produced by conventional high pressure die casting. This new knowledge is based on a combination of unique exposure methods and a number of advanced analytical methods. Rheocasting of magnesium alloys was developed at Jönköping University (Sweden) in order to increase the strength of the material. Esmaily’s research shows that the technique also gives the alloys surprisingly good ability to withstand corrosion. With his research he shows the connection between the microstructure of the alloy and its corrosion resistance. Now that the connection has been mapped, new possibilities to optimize the microstructure for even better corrosion resistance have opened up.
« Connected Energy and Renault to collaborate on energy storage and EV charging technology; second-life batteries in E-STOR | Main | ANGP gets exclusive license to UTRC technology for conformable natural gas vehicle storage tanks » New Flyer of America, a subsidiary of New Flyer Industries, the leading manufacturer of heavy-duty transit buses and motor coaches in the United States and Canada, has completed a two-week in-service demonstration with Miami-Dade Transit of the New Flyer Xcelsior heavy-duty battery-electric XE40 transit bus. The two-week demonstration, concluded on 21 January, resulted in more than 1,150 in-service miles and more than 1,800 passenger rides on 11 different service routes throughout Miami-Dade County. New Flyer provided Miami-Dade Transit performance reports from New Flyer Connect, a combination of onboard telematics systems used to gauge and manage operational efficiency. Using the Connect system, the New Flyer Xcelsior XE40 battery-electric bus reported up to 23.8 diesel equivalent miles per gallon in energy consumption (equating to 1.6 kWh per mile). Miami-Dade Transit provides service from Miami Beach and Key Biscayne to West Miami-Dade, as far north as Broward County and as far south as Homestead, Florida City and the Middle Keys. Miami-Dade Transit is the 15th largest public transit system in the USA, and the largest transit agency in the state of Florida. The Xcelsior battery-electric bus features a Siemens electric drive system and proven electric subsystems with electric drive motor technology permitting the bus to reduce the energy consumed while driving, and increase the energy recovered during braking.
« Nissan to launch piloted drive Qashqai in Europe next year | Main | UTRC and ANGP unveil first low-pressure conformable natural gas tank design » Nissan outlined its Intelligent Mobility vision at the Geneva International Motor Show. Created to guide the Nissan product evolution, Intelligent Mobility will anchor company decisions around how cars are powered, how cars are driven, and how cars integrate into society, all while staying focused on creating more enjoyable driving experiences. At the core of Nissan Intelligent Mobility are three areas of innovation: Nissan Intelligent Driving, spearheaded by Nissan’s autonomous drive technology, Piloted Drive; Nissan Intelligent Power, spearheaded by electric vehicles (EV); and Nissan Intelligent Integration—new links between vehicles and society. Our Intelligent Mobility vision is a framework to move customers around the world towards a safer and more sustainable future. To realize this vision, Nissan has launched a long-term strategy, supported by significant R&D investments. This enabled Nissan to introduce the breakthrough LEAF, the world’s first mass production EV, in 2010— years before any of our competitors. It has also driven our development of cutting-edge autonomous drive technologies, which will be available in a range of mass production models by 2020. These steps are allowing Nissan to deliver the benefits of EV and autonomous drive innovations to as many customers as possible and, ultimately, to lead the way toward a new era of mobility. Each area represents technological advances by Nissan – safety innovations through autonomous technology such as high-stability control and high-reliability drive systems; high-efficiency powertrains, including alternative and conventional fuel engines with advanced transmissions; and energy management solutions. Nissan Intelligent Driving. Nissan’s Intelligent Driving is foremost about performance, comfort and safety, removing the stress from a daily commute or minimizing the risk of unsafe conditions. Many of these advances are already available, as drivers can rely today on vehicles to recognize danger or take appropriate action to enhance safety. Nissan will advance its Safety Shield technologies such as Lane Departure Warning and Forward Emergency Braking into autonomous drive technologies, available to all customers on core models in the range. Nissan will launch multiple vehicles with autonomous drive technology in the next four years in Europe, the United States, Japan and China. The technology will be installed on mainstream, mass-market cars at affordable prices and the first model will come to Japan this year. An on-road demo event in Europe in 2016, will showcase the maturity of Nissan’s autonomous drive technology. In 2017, the Nissan Qashqai will become the first Piloted Drive vehicle available in Europe. Nissan Intelligent Power. Nissan has been the leading automotive brand in electric vehicle technology and sales. Nissan believes that quiet, yet powerful, acceleration with an increased range is essential to ensure an incredible driving experience. Nissan is boosting EV battery energy density and performance, represented by the 60 kWh battery and up to 550 km (342 miles) autonomy in the Nissan IDS Concept, which is making its European premiere at Geneva. Nissan technologies also reduce charging time, and develop EV potential in other innovative ways. Alternate sources of on-board electric power, such as fuel cells, will further encourage fuel diversity and renewable energy development. Also on the path of Intelligent Power is the further improvement of downsized turbo and X-TRONIC transmissions for both fuel efficiency and seamless response and acceleration. Nissan Intelligent Integration. Nissan will help connect cars to social infrastructure such as road, information and electric power networks which will eventually lead to reduced traffic jams, more efficient car sharing, remote vehicle operation and improved energy management. Nissan also continues to support expanding EV charging networks across Europe, the US, Mexico and Japan. To date, more than 10,500 quick chargers have been installed globally and in Europe, Nissan is working with partners to even further increase quick chargers that can be used by all EVs, helping to grow the entire market and bringing convenience and confidence to the European EV drivers, not just Nissan drivers. Ubiquitous connectivity is an expectation of car consumers as an extension of their work and personal devices. Technology trends are everywhere with mobility and the “bring your own device” phenomenon extending to vehicles. Nissan said it is committed to enabling vehicles to be part of that connected ecosystem.
The Texas Advanced Computing Center (TACC) at The University of Texas at Austin (UT Austin) announced that the Lonestar 5 supercomputer is in full production and is ready to contribute to advancing science across the state of Texas. Managed by TACC, the center's second petaflop system is primed to be a leading computing resource for the engineering and science research community. The supercomputer is sponsored by UT System in partnership with UT Austin, Texas Tech University, Texas A&M University, and the Institute for Computational Engineering and Sciences (ICES) and the Center for Space Research at The University of Texas at Austin. The technology partners are Cray, Intel and DataDirect Networks. Lonestar 5 is designed for academic researchers, serving as the primary high performance computing resource in the UT Research Cyberinfrastructure (UTRC) initiative. Sponsored by The University of Texas System (UT System), UTRC provides a combination of advanced computational systems, a large data storage opportunity, and high bandwidth data access. UTRC enables researchers within all 14 UT System institutions to collaborate with each other and compete at the forefront of science and discovery. The new Lonestar 5 Cray XC40 supercomputer, which contains more than 30,000 Intel Xeon processing cores from the E5-2600 v3 product family, provides a peak performance of 1.25 petaflops. With 24 processing cores per compute node, Lonestar 5 follows the trend of more cores per node that the industry sees in every generation of microprocessors. The system is the fifth in a long line of systems available for Texas researchers, dating back over 15 years to the original Lonestar 1 system (also a Cray). The system will continue to serve its mainstay user communities with an emphasis on addressing a wide variety of research areas in engineering, medicine and the sciences. A number of researchers have been using Lonestar 5 in an "early user" mode over the last few months. Researchers from UT System institutions and contributing partners wishing to request access to Lonestar 5 should do so via the TACC User Portal.