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Technical Paper

Design and Development of Tunable Exhaust Muffler for Race Car

2016-02-01
2016-28-0188
The Exhaust Noise is one of the major noise pollutants. It is well-known that for higher noise reduction, the engine has to bear high back pressure. For a race car, back-pressure plays a major role in engine's performance characteristics. For a given condition of engine rpm & load, conventional muffler has a fixed value of back-pressure and noise attenuation. Better acceleration requires low back-pressure, but the exhaust noise should also be less than the required (Norm) value (110 dBA). This contradicting condition is achieved here by using a ‘Butterfly Valve’ in this novel exhaust muffler. The butterfly valve assumes 2 positions i.e. fully open & fully closed. When the valve is fully closed, the noise reduction will be higher, but the back-pressure will also shoot up. When open, noise reduction will be less and so the back-pressure. So, when better performance is required, the valve is opened and back-pressure is reduced. The muffler is designed for a 4 cylinder 600 cc engine.
SAE MOBILUS Subscription

SAE International Journal of Vehicle Dynamics, Stability, and NVH

2017-01-01
Editor-in-Chief: Warren Hardy, Ph.D., Virginia Tech, USA Indexed in CNKI ESCI (Emerging Sources Citation Index, Web of Science) Engineering Village (Ei Compendex) IET Inspec Japan Science and Technology (JST) Agency JSTOR Sustainability Collection Scopus 1.2 2020CiteScore   43rd percentile Powered by   Author Resources Call for Papers Library Recommendation Form Published Volumes Subscription Options Aims and Scope The SAE International Journal of Transportation Safety provides a forum for peer-reviewed scholarly works concerning all aspects of injury causation and mitigation associated with any transportation system. This includes safety mechanisms, impact, and injury response and tolerance on multiple scales, with the objective of developing restraint, vehicle, and infrastructure environments that are safer for the occupant, rider, passerby, and warfighter.
Book

Honda R&D Technical Review: October 2007

2007-10-01
This unique publication chronicles the top Honda technical developments from April through September 2007. The 12 papers included give rare insight into the Honda's worldwide R&D team, and cover automotive, motorcycle, power products, and other fundamental technologies. Full-color diagrams complement the text. Title highlights include: Interior Sound Enhancement of Vehicle Acceleration for New Model ACCORD Development of Aluminum Liner in Die-cast Cylinder Block for High-power and High-displacement V6 Engine Presentation of 2006 Model RC211V Establishment of Evaluation Method for Riding Comfort of Motorcycle Seats Low Noise and Lightweight Technology of Inverter Generator EU6500is Development of Moment Assist and System Weight Compensation Control for Wearable Walking Assist System This publication is available in both print and electronic format. The electronic format is also conveniently available for purchase in individual chapters.
Book

Wireless Positioning Technologies and Applications

2008-01-01
At last—here’s a comprehensive book that puts full details on all short-range wireless-positioning methods at your command for instant access and use. This one-stop resource surveys each technique’s theory of operation, advantages and disadvantages, applicability in different domains, implementation procedures, and accuracy to help you select the right technology for any application and ensure the best results possible. Real-life examples together with 161 diagrams help bring all options into sharp focus. After introducing wireless positioning fundamentals along with various personal, commercial, and industrial applications, the book guides you step by step through radio signal time of flight methods, the signal strength method, the angle of arrival system, and the geometric use of distance measurement to determine location. It discusses location awareness applications and implementations using cellular networks.
Book

Technology for a Quieter America

2010-01-01
Exposure to noise at home, at work, while traveling, and during leisure activities is a fact of life for all Americans. As the population of the United States and, indeed, the world increases and developing countries become more industrialized, problems of noise are likely to become more pervasive and lower the quality of life for everyone. Efforts to manage noise exposures, to design quieter buildings, products, equipment, and transportation vehicles, and to provide a regulatory environment that facilitates adequate, cost-effective, sustainable noise controls require our immediate attention. This book, written for the engineering community; the public; government at the federal, state, and local levels; private industry; labor unions; and nonprofit organizations, looks at the most commonly identified sources of noise, how they are characterized, and efforts that have been made to reduce noise emissions and experiences.
Book

Honda R&D Technical Review: October 2013

2013-10-01
Honda's October 2013 R&D Technical Review features cutting-edge developments from Honda's worldwide R&D teams. This edition brings 23 original papers on the introduction of new technologies, spanning automobile, motorcycle, power products, and aircraft engines, to mention the most meaningful. This title covers the main following topics: • Development of Sport Hybrid i-MMMD control system for the 2014 Accord • Development of robotic lawnmower Miimo • Research on combustion improvement techniques by intake valve offset and squish effect • Identification of mechanism of transmission of flow-induced noise through glass for vehicle interior noise reduction • Design appearance evaluation tool for non-prototype development • Flat belt test system for suspension and tire measurement
Magazine

Automotive Engineering International 2001-03-01

2001-03-01
Toyota Prius: Best-Engineered Car of 2001 Following the Japanese introduction of the first-generation Pruis in 1997, the significantly re-engineered second-generation model features new technology to meet the demands of the Western market, including improved driving performance, lower emissions, and reduced costs. Introducing Niel Schilke, SAE President for 2001 General Motors' former top engineer in Canada brings a systems engineering mentality, along with high expectations, to the SAE presidency. Fuel cells start to look real It is looking more and more as if the fuel-cell-powered car--the long-awaited "clean personal transportation of the future"--is moving from laboratory vision to technical reality, if not yet market actuality. Fuel-cell testing Capabilities that deliver reliable monitoring and control, as well as offer the benefit of a flexible configuration, are critical to keep pace with evolving fuel-cell technology, according to National Instruments.
Magazine

Automotive Engineering International 2001-08-01

2001-08-01
Managing and remaking metals Who knew a hundred years ago that just under half of a 2001 model year vehicle would be manufactured out of dismantled, flattened, and shredded older vehicles? Global viewpoints: Japan plans for the future Greater competition from Western and other Asian nations, as well as global environmental concerns, have focused the country's long-term technology and engineering strategies. Hear the noise, feel the vibe There being no silver bullet for noise and vibration attenuation, suppliers are providing a variety of options for the OEM quest to provide a smooth and quiet ride. Forum for fuel cells An in-depth, one-day fuel-cell summit, presented by AEI, allowed open discussion on the burgeoning technology from various stakeholders. This month's focus is on two keynote presentations that addressed some business and regulatory trends regarding the development and adoption of fuel cells.
Magazine

Automotive Engineering International 2006-09-01

2006-09-01
Systems drive safety Engineers are using a holistic approach to design safer vehicles by adding function and integrating multiple subsystems. The gas in greener Biodiesels promise to help reduce petroleum consumption and CO2 emissions, but much of the potential depends on production and infrastructure investment. Good vibrations Instead of excising all noise, vibration, and harshness, engineers are focusing more on making specific sounds and feedback "fit" a vehicle. SAE Commercial Vehicle Congress Preview International Truck and Engine executives head the charge for "positive industry change" at SAE's third Congress for the on- and off-highway communities.
Magazine

Automotive Engineering International 2004-09-01

2004-09-01
Ultracapacitors charge ahead The limitations of current energy-storage solutions could encourage consideration of these alternative solutions, but more engineering work needs to be done to reduce costs. Technology for all Automotive industry executives expect high-end technologies, once considered only for inclusion in luxury cars, to increasingly make their way into entry- and mid-level vehicles in the very near future. Convergence continues A lot of automotive electronics ground has been covered at the Convergence conferences past, and there's more to come at this year's show in October. Fueling the next generation As hydrogen joins the battle for automotive power with gasoline and diesel, the future could be more choices rather than one winner.
Magazine

Automotive Engineering International 2008-09-01

2008-09-01
Looking forward to safer highways New camera technologies, along with better algorithms and software, are enabling the move to active-safety systems that warn and then take control of vehicles in dangerous situations. Fuel-cell futures Eager to find alternative-propulsion solutions, automakers are betting that renewed emphasis on fuel-cell vehicles will pay off in the long run, with the latest examples aiming to prove higher-volume production feasibility. Consensus building ojn refrigerant type The hydrofluoro-olefin refrigerant HFO-1234yf has emerged as Europe's favored R-134a replacement, but some prefer R-744. Strengthening the link through software The next generation of simulation tools could help better synchronize manufacturing engineering and product design.
Standard

Lifting Crane Sheave and Drum Sizes

2013-04-18
HISTORICAL
J881_201304
This SAE Standard covers minimum dimensional relationship for sheaves, drums, and wire rope for mobile, construction type lift cranes.
Standard

Lifting Crane Sheave and Drum Sizes

2021-10-21
CURRENT
J881_202110
This SAE Standard covers minimum dimensional relationship for sheaves, drums, and wire rope for mobile, construction type lift cranes.
Magazine

MOMENTUM: MARCH 2018

2018-03-01
All quiet on the snowmobile front Two mechanical engineering students at Michigan Technological University chose snowmobile noise attenuation as the topic of their senior design project. A return to glory days? Once dominant, Cornell University's Formula SAE team views its strong 2017 performance as a hopeful sign that it's back on a championship path.
Magazine

SAE Vehicle Electrification: August 12, 2014

2014-08-12
A new Formula for racing The new Formula E series' electric racecars are intended to pioneer new technology for broader use in production, encouraging fans to think differently about the technologies they use. Production of satellite with first all-electric propulsion system advances Electric propulsion has been limited so far to small movements of the satellites once it is in its geostationary orbit. The Boeing 702SP innovation is its use of electric propulsion to raise the satellite from its launch-vehicle drop-off point to geostationary orbit. Using CAE to assess whining noise of electric powertrains To develop an electric powertrain with a minimum noise level and minimized whining it is necessary to have accurate CAE simulation and precise criteria to assess whining noise.
Magazine

Automotive Engineering: June 2017

2017-06-01
Tackling NVH one dB per day New tools and technologies are helping engineers reduce vehicle Noise, Vibration and Harshness. Artificial intelligence becomes a reality Automakers could be among the leaders in deploying AI in free-standing, high-reliability environments. But developers must determine how to mitigate undesirable side-effects. Lidar: autonomy's mission-critical component Automated-driving capability likely won't happen without Lidar. But what technology-and at what price? Formula One goes longer, lower, wider for 2017 New rules make the cars faster and more aggressive-looking, with a wider track, wider tires and bigger wings. Editorial: Core Ford, New Ford...OneFord? SAE Standards News Seeking a common language for vehicle automation Supplier Eye Are you innovating for NVH?
Magazine

MOMENTUM: NOVEMBER 2018

2018-11-01
The art of 'why?': exploring the impact of autonomy Kettering University students reconciled different viewpoints and backgrounds to explore the impacts of autonomous vehicles through the AutoDrive Challenge. Finding the right frequency The University of Minnesota Duluth snowmobile team's use of noise frequency analysis helped it achieve its bester-ever finish in the SAE Clean Snowmobile Challenge. Inside Rennteam Uni Stuttgart. A formal structure and precisely defined roles help the Formula Student team from the University of Stuttgart remain a perennial power.
Magazine

MOBILITY ENGINEERING: December 2017

2017-12-01
Rockets re-engineered-a step further into the cosmos Powertrain design for reliability Ice breaker Mazda's Skyactiv-X beats the big companies to market with a promising new engine that marries Otto and Diesel attributes. Advances for off-highway engine design As manufacturers continue to drive out cost and meet a worldwide patchwork of regulatory frameworks, the tools for developing those engines are advancing. From showcase prototypes to advanced analytical techniques, suppliers are helping the cause. Aeroacoustic simulation delivers breakthroughs in aircraft noise reduction Autonomy testing: Simulation to the rescue Autonomous technology development injects new rigors on vehicle-development testing.
Magazine

MOBILITY ENGINEERING: September 2017

2017-09-01
Opposed-piston engines: the powerplant of the future India's dream of an all-EV fleet by 2030: Myth, miracle, or reality? An approach for prediction of motorcycle engine noise under combustion load Innovations for lightweighting Tough U.S. fuel-economy bogies for 2021 and beyond are driving new approaches for materials, as seen in these examples. More intelligence equals more efficiency, enhanced functionality Advanced electronic systems require renewed focus on architectures, processors, sensors and networks. Connected commercial vehicles bring cybersecurity to the fore Connectivity, automation and electrification will drive vehicle development in the near future, say industry experts attending the revamped SAE COMVEC 17 event.
Book

The Ford GT

2004-03-08
In the 1960's very little science and engineering had been applied to the art of motor racing. As a result, there was no general agreement about the best technical approach to generating speed on a road racing track. Each car maker viewed the problem through the lenses of their own history and capabilities. The cars on the starting grid demonstrated how varied these histories were. When Ford first assaulted Le Mans in 1964, the company followed a similarly casual approach by initially purchasing a race car design from the English firm Lola. This car's numerous shortcomings soon led Ford to apply its considerable engineering and developmental resources to the project, and the result was the one-two-three finish in 1966. First place finishes followed in 1967, 1968 and 1969. It is the fabulous victories by Ford in the 1960's that inspired the new 2005 Ford GT. Based on a concept car the new production car embodies the characteristic proportions and styling elements of the original GT.
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