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Technical Paper

Experimental Acoustic Analysis of a Motorcycle Dissipative Muffler in Presence of Mean Flow

2016-11-08
2016-32-0039
In recent years, the motorcycle muffler design is moving to dissipative silencer architectures. Due to the increased of restrictions on noise emissions, both dissipative and coupled reactive-dissipative mufflers have substituted the most widely used reactive silencers. This led to higher noise efficiency of the muffler and size reduction. A dissipative muffler is composed by a perforated pipe that crosses a cavity volume filled by a fibrous porous material. The acoustic performance of this kind of muffler are strictly dependent on the porosity of the perforated pipe and the flow resistivity characteristic of the porous material. However, while the acoustic performance of a reactive muffler is almost independent from the presence of a mean flow for typical Mach numbers of exhaust gases, in a dissipative muffler the acoustic behaviour is strictly linked to the mass flow rate intensity.
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.
Technical Paper

Improving Fuel Economy of Thermostatic Control for a Series Plugin-Hybrid Electric Vehicle Using Driver Prediction

2016-04-05
2016-01-1248
This study investigates using driver prediction to anticipate energy usage over a 160-meter look-ahead distance for a series, plug-in, hybrid-electric vehicle to improve conventional thermostatic powertrain control. Driver prediction algorithms utilize a hidden Markov model to predict route and a regression tree to predict speed over the route. Anticipated energy consumption is calculated by integrating force vectors over the look-ahead distance using the predicted incline slope and vehicle speed. Thermostatic powertrain control is improved by supplementing energy produced by the series generator with regenerative braking during events where anticipated energy consumption is negative, typically associated with declines or decelerations.
Magazine

Aerospace & Defense Technology: February 2022

2022-02-01
What system Designers Should Know About MOSA Standards Microtube Technology A Catalyst for Next-Gen Aerospace Thermal Control Space Industry Test Challenges Advancing Metrology at Mach Speed Drone Mounted Inspection Breaks Barriers for F-35 RF Technology Helps Connect Avionics Systems Using Open-Cavity Plastic Packages in Avionics Applications Electronic Prognostics - A Case Study Using Global Positioning System (GPS) Prognostic health management (PHM) of electronic systems presents challenges traditionally viewed as either insurmountable or not worth the cost of pursuit, but recent changes in weapons platform acquisition and support requirements has spurred renewed interest in electronics PHM, revealing possible applications, accessible data sources, and previously unexplored predictive techniques.
Magazine

Automotive Engineering: April 2022

2022-04-01
Airing on the side of innovation Lucid Motors' home-grown innovations are leading the pace in electrification. Top engineers tell how and why they're building a benchmark with the new Air EV. Keeping combustion in the conversation The world needs ICEs to stick around - here's how. Engineering a 'Maverick' hybrid transmission Ford Powertrain engineers marry their new in-house electric machine with the proven HF45 transmission - under aggressive vehicle program timing. Driving electrified powertrain systems design Drive System Design punches beyond its weight class in meeting customer needs for electrified powertrain systems engineering services. DSD's North American chief Jon Brentnall explains.
Magazine

Automotive Engineering: November/December 2020

2020-11-26
Volkswagen reveals its 'people's' EV VW's ID.4 leads the 2021 stampede to electrification for the mass market. Answering the fuel-cell compressor question The optimum compressor device for a fuel cell depends on vehicle application - and a lot more. An Eaton expert explains. Tire pressure's impact on EV driving range A new study shows that tighter control of tire-pressure loss can lead to marked improvement in electric-vehicle efficiency. Editorial Warm socks for the EV options list Supplier Eye For suppliers, a new drumbeat New SAE wireless charging standard is EV game-changer Tula DMD aims for more-efficient e-machines Multiphysics helps transform modeling, simulation Is the camshaft being timed out? New Magna seat puts connectivity in the second row BMW reveals its first "M" performance-badged two-wheeler Volkswagen readies new-generation Golf R Q&A Discussing safety tech, standards and industry trends with Hyundai North America's Brian Latouf
Magazine

Automotive Engineering: July/August 2020

2020-07-30
2021 Mustang Mach-E Ford's first dedicated electric platform reveals the challenges and opportunities in developing a state-of-the-art EV. E-Motorcycle project pushes battery boundaries For Triumph's TE-1 project, new materials and cell technologies target greater energy density and overall performance. Williams Advanced Engineering's CEO explains. Tracking the battery-market battleground Production scale, yield and new cell technologies are challenging EV battery-cell suppliers, explains an expert at IHS Markit.
Magazine

Automotive Engineering: November/December 2021

2021-12-01
High on hydrogen Through its Symbio joint venture with Michelin, Faurecia expands far beyond its interior-systems base into the fuel-cell future. Simulating a faster route to ADAS and AV validation With its new cloud-based Simphera platform, dSpace responds to demand from global automated-vehicle development teams to help manage their expanding, complex workload. Innovating the methanol fuel cell Using methanol as the source fuel provides an alternative to a gaseous-hydrogen distribution and storage infrastructure, among other potential benefits. Engineering the 2022 Toyota Tundra Chief Engineer Mike Sweers talks structure, materials and a different approach to hybrid power.
Magazine

Automotive Engineering: October 2021

2021-10-01
BYD's Blade Runner The Chinese mobility-and-energy giant's novel 'Blade' battery eliminates the cell module level to compete with NCM chemistry at significantly lower cost - and greater proven safety. Making UX easy on the eyes Faurecia IRYStec combined physiology and image processing to create uniquely personalized high-fidelity screen displays, as pioneered by Mercedes' MBUX. The company's founder explains. Extending the Wankel's future on hydrogen fuel Proven in thousands of military drone aircraft, the lightweight and power-dense Wankel rotary still aims for a future...as a zero-emissions range extender. 'Retuning' lubricants for EV duty Lubrizol's top grease expert talks about how the electric vehicle trend is driving innovations and creating opportunities.
Magazine

Automotive Engineering: June 2021

2021-06-03
Teardown Titan Munro & Associates is leading competitive analysis into the EV age - and spreading the gospel with a global YouTube fan base. Lightweight steel on a (cold) roll A newly developed high-strength steel for cold stamping aims to beat aluminum for EV battery enclosures and other vehicle applications. How EVs and their electronics stick together New adhesives play an increasingly vital role in vehicle structures, battery packs, and in protecting sensitive electronic components from extreme thermal cycling and contaminants. Editorial Farewell and thanks, Mr.
Magazine

Automotive Engineering: July/August 2021

2021-07-29
Making the case for in-wheel motors IWMs can improve EV efficiency, dynamics, safety, and manufacturability - when unsprung mass is addressed in their design. 3D printing scales-up Constant innovation in machine design, compatible materials and design software is leading additive manufacturing from the prototype shop to the production floor. Boosting patents during the pandemic Nissan's North American researchers set a company record for their patent output during the first year of the pandemic. Two teams revealed how they kept the IP on track.
Magazine

Automotive Engineering: April 2021

2021-04-01
Optimizing hybrids for cost and fficiency AVL engineers detail a modular engine program suitable for all forms of hybridization. ICE: Once more, with feeling BorgWarner CSO sees at least one more generation of the ICE before its 'sunset.' Actuating hybrid and EV efficiency More sophisticated driveline-disconnect systems are part of the electrified-vehicle future, says the head of controls at Stoneridge. The world's piston maker charts the ICE future According to Mahle's research VP, the remaining development path for internal combustion is clean, electrified and ready for alternative fuels. Pumping EV heat Heat-pump technology is a game-changer for the widespread adoption of electric vehicles, says a service-tech training expert and EV owner.
Magazine

Automotive Engineering: January/February 2021

2021-01-28
Gearing EVs for greater efficiency Ingear, an innovative 2-speed transmission born in Canada, aims to unlock electric-vehicle performance and efficiency. Built-in Google vehicle apps arrive Android Automotive OS opens the door, cautiously, for third-party developers. Riding on air: Activated carbon aims at autos An old piece of science is set to bring new applications across the mobility spectrum. Allison builds a testing powerhouse Allison Transmission's new Vehicle Environmental Test center in Indianapolis is open for business for external and in-house customers alike. The VET has everything vehicle development teams need to improve testing efficiencies. Editorial The EVs are coming. Now what?
Magazine

SAE Truck & Off-Highway Engineering: December 2021

2021-12-02
Steel sector aids sustainability Volvo Group partners with SSAB on 'green steel' for off-highway machines and with Ovako for access to fossil-free hydrogen. CV autonomy: Picking the 'low-hanging fruit' Increasingly automated commercial vehicles offer challenges and opportunities in simulation, data management and standardization. Developing EV-specific lubes As electric-vehicle technology accelerates, dedicated e-fluids are necessary to maintain proper levels of drivetrain performance. Editorial Real-world emphasis on electric Mahle, Liebherr develop active pre-chamber for hydrogen ICE ABS ramps up commercial-vehicle battery-pack assembly Navistar updates A26 engine, improves FE by 4% Bosch debuts new CV-specific electric motor and inverter Western Star adds 'weight sensitive' 47X to vocational lineup Hyundai CE launches next-gen electric forklift Q&A Mahle's Laurent Art discusses thermal-management challenges, solutions for battery and fuel-cell electric commercial vehicles.
Magazine

SAE Truck & Off-Highway Engineering: October 2021

2021-10-07
Defending the heavy-vehicle cyber domain Cybersecurity experts explained at SAE COMVEC 2021 how they're preparing the next generation of thwarters to protect increasingly electrified, connected and automated trucks. Digitalization of product engineering ESI proposes "sustainable" product development via virtual prototyping to ensure operational safety and comfort for off-highway machines. Developing a next-gen VGT Engineers from Mitsubishi Heavy Industries refine the design of a variable geometry turbocharger for commercial vehicles. Editorial Insightful comments from COMVEC Lidar lets Vermeer automate baling processes Extending a Wankel future on hydrogen fuel Next-gen HMI crucial for ADAS efficacy Altair honors weight-saving innovations A bevy of battery and fuel-cell electric truck reveals Q&A Dr. Philip Stephenson, general manager of the PACCAR Technical Center, hones in on the potential efficacy of E-fuels, commercial-vehicle battery-swapping.
Magazine

SAE Truck & Off-Highway Engineering: August 2021

2021-08-05
Accelerating truck autonomy Platform-agnostic interfaces, field data analytics and smart diagnostics will help the commercial-vehicle industry reach SAE Level 4 and 5 operations sooner. Upswing in outsourced EV testing As testing for electric commercial-vehicle propulsion systems surges, Drive System Design is rushing to expand its testing capabilities in the U.S. to keep up with the demand. Global emissions regs demand differing engine strategies The best choice in emissions-reducing technology varies for the U.S. versus Europe and elsewhere, a Jacobs expert details. Precision ag aids sustainability Deere expert Deanna Kovar, a 2021 SAE COMVEC keynoter, provides her thoughts on the future of autonomy, computer vision and machine learning, data management and more.
Magazine

SAE Truck & Off-Highway Engineering: August 2020

2020-08-06
Big future for e-axles, advanced motors Top transmission engineers claim driveline electrification will transform everything from all-wheel drive to Class 8 tractor-trailers. Big data's benefits keep a-comin' Gigabytes of data are being collected and increasingly mined to improve field operations, maintenance and even vehicle design. Transformative times Despite a challenging climate, technology development progresses - as does the sharing of innovative ideas - virtually. Editorial Zeroing in on zero emissions Softing envisions secure, reliable predictive maintenance Reconstructing accidents in the ADAS age Paving the way to improved truck fuel efficiency Nikola looks to accelerate production, hydrogen infrastructure Mecalac designs unique-pivoting swing loader Q&A' Horiba's Joshua Israel discusses complex regulatory landscape's impact on commercial-vehicle development and shift to electrification.
Magazine

SAE Truck & Off-Highway Engineering: June 2020

2020-06-01
Embedded systems help drive autonomy forward Kontron provides high-end knowledge for image processing, analysis with fewer control modules. Open approach to propulsion Deutz CEO sees combination of sustainable-fuel combustion engines and electric drive systems powering the off-highway market. Increasing connectivity, leveraging intelligence Parker Hannifin expert discusses IoT for mobile equipment and moving beyond standard telematics by integrating systems controllers and smart components. Cummins, Tula test 'dynamic' cylinder deactivation Tula's Dynamic Skip Fire technology already used in light-duty gasoline engines shows potential in heavy-duty diesels to significantly reduce NOx emissions. Supplier Directory Complete listing of industry suppliers categorized by technology area.
Magazine

Aerospace Engineering & Manufacturing 2009-05-01

2009-05-01
An eye for detail Manufacturers hone next-generation designs with advanced measurement and inspection tools. Emissions progress New European research and development efforts aim to achieve step changes in engine emissions performance. Seeing virtually everything Simulating larger systems helps engineers understand more interactions.
Magazine

Aerospace Engineering 2004-11-01

2004-11-01
Wiring UAVs The development of electronic architectures for UAVs and UCAVs marks a major step-change in the evolution of military aircraft as significant as the emergence of jet propulsion more than 60 years ago. Distributed simulation A new modeling technique is applied to a HALE UAV power system using detailed subsystem simulations of the turbine engine, generators, and loads. Tradition, transition, and transformation SAE 100 Future look: As the sun sets on the first 100 years of SAE, we refllect on a proud and rich tradition of contribution to the transportation industry. The battle for information flow SAE 100 Future look: Epic Data recognizes that the recent development of highly secure, futuristic real-time information flows provide a tremendous competitive advantage to field commanders making life or death decisions.
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