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Viewing 241 to 270 of 9395
2016-04-05
Journal Article
2016-01-1375
Masahiro Ueda, Satoshi Ito, Daichi Suzuki
Abstract Ride quality is an important purchasing consideration for consumers. It is typically defined in terms of noise, vibration and harshness. These phenomena are a result of vibrations caused at the engine/powertrain and from the road surface, which are transmitted to the passenger cabin. To minimize such vibrations, rubber parts are used extensively at mounting points for the cabin, such as engine mountings and suspension bushings. The vehicle development process increasingly requires performance testing, including rubber parts using CAE, prior to prototype evaluation. This in turn requires a rubber material model that can accurately describe dynamic characteristics of rubber components, particularly frequency and amplitude dependency.
2016-04-05
Journal Article
2016-01-1543
Donald F. Tandy, Scott Hanba, Robert Pascarella
Abstract One important part of the vehicle design process is suspension design and tuning. This is typically performed by design engineers, experienced expert evaluators, and assistance from vehicle dynamics engineers and their computer simulation tools. Automotive suspensions have two primary functions: passenger and cargo isolation and vehicle control. Suspension design, kinematics, compliance, and damping, play a key role in those primary functions and impact a vehicles ride, handling, steering, and braking dynamics. The development and tuning of a vehicle kinematics, compliance, and damping characteristic is done by expert evaluators who perform a variety of on road evaluations under different loading configurations and on a variety of road surfaces. This “tuning” is done with a focus on meeting certain target characteristics for ride, handling, and steering One part of this process is the development and tuning of the damping characteristics of the shock absorbers.
2016-04-05
Journal Article
2016-01-1595
Haibo Wu, Jiangbin Zhou, Qian Chen, Gongwen Liu, Chaoqun Qian
Abstract In this paper we present the work which was done at Shanghai-VW for using computational aero-acoustic (CAA) simulation in the vehicle development process to assess and improve the buffeting behavior of a vehicle when the rear side window is open. In the first step, a methodology was established and validated against wind tunnel tests using a Sedan. The methodology consists of a calibration of the CAA model to represent the properties of the cabin interior of the real car in terms of damping, wall compliance and leakage followed by CAA simulations of the full vehicle at different wind speeds to obtain the transient flow field around the exterior shape and inside the passenger compartment. The interior noise spectra are directly calculated from the transient pressure inside the cabin.
2016-04-05
Journal Article
2016-01-0639
Brian C. Kaul, Benjamin Lawler, Akram Zahdeh
Abstract Engine acoustics measured by microphones near the engine have been used in controlled laboratory settings for combustion feedback and even combustion phasing control, but the use of these techniques in a vehicle where many other noise sources exist is problematic. In this study, surface-mounted acoustic emissions sensors are embedded in the block of a 2.0L turbocharged GDI engine, and the signal is analyzed to identify useful feedback features. The use of acoustic emissions sensors, which have a very high frequency response and are commonly used for detecting material failures for health monitoring, including detecting gear pitting and ring scuffing on test stands, enables detection of acoustics both within the range of human hearing and in the ultrasonic spectrum. The high-speed acoustic time-domain data are synchronized with the crank-angle-domain combustion data to investigate the acoustic emissions response caused by various engine events.
2016-04-05
Journal Article
2016-01-0731
Gen Shibata, Daisuke Nakayama, Yuki Okamoto, Hideyuki Ogawa
Abstract Reductions in combustion noise are necessary in high load diesel engine operation and multiple fuel injections can achieve this with the resulting reductions in the maximum rate of pressure rise. In 2014, Dr. Fuyuto reported the phenomenon that the combustion noise produced in the first combustion can be reduced by the combustion noise of the second fuel injection, and this has been named “Noise Cancelling Spike Combustion (NCS combustion)”. To investigate more details of NCS combustion, the effects of timings and heating values of the first and second heat releases on the reduction of overall combustion noise are investigated in this paper. The engine employed in the research here is a supercharged, single cylinder DI diesel engine with a high pressure common rail fuel injection system.
2016-04-05
Journal Article
2016-01-0774
Martin Wissink, Rolf Reitz
Abstract Low-temperature combustion (LTC) strategies have been an active area of research due to their ability to achieve high thermal efficiency while avoiding the formation of NOx and particulate matter. One of the largest challenges with LTC is the relative lack of authority over the heat release rate profile, which, depending on the particular injection strategy, either limits the maximum attainable load, or creates a tradeoff between noise and efficiency at high load conditions. We have shown previously that control over heat release can be dramatically improved through a combination of reactivity stratification in the premixed charge and a diffusion-limited injection that occurs after the conclusion of the low-temperature heat release, in a strategy called direct dual fuel stratification (DDFS).
2016-04-01
WIP Standard
J1192
This standard established the requirements and test procedures for the operational life, corrosion resistence, and sound pressure level of motorcycle electric and electro pnuematic audible warning deveices. Test equipment, environment, and procedures are specified.
2016-03-31
Article
Ford's 6.7-L diesel V8 has yet to obtain certified power ratings, but it's expected to exceed 900 lbft of torque, necessitating an upgrade of the company's dyno sleds to enable SAE J2807 vehicle tow testing.
2016-03-27
Article
Self-driving car project CEO John Krafcik discussed Google's work underway toward fully autonomous vehicles, at a recent NY forum. First likely market: the elderly and impaired.
2016-03-25
WIP Standard
AS8017D
This SAE Aerospace Standard (AS) establishes minimum performance standards for new equipment anticollision light systems.
2016-03-25
WIP Standard
AIR5661A
This report provides data and general analysis methods for calculation of internal and external, pressurized and unpressurized airplane compartment pressures during rapid discharge of cabin pressure. References to the applicable current FAA and EASA rules and advisory material are provided. While rules and interpretations can be expected to evolve, numerous airplanes have been approved under current and past rules that will have a continuing need for analysis of production and field modifications, alterations and repairs. The data and basic principles provided by this report are adaptable to any compartment decompression analysis requirement.
2016-03-24
Article
In this Q&A, Toyota Technical Center President Seiya Nakao discusses future mobility development, technical innovation, Toyota's recent reorganization, and the ever-changing automotive engineering profession.
2016-03-14
Article
As airlines strive to move more and more people faster and faster, the talk of a future supersonic aircraft for commercial purposes is getting louder and louder.
2016-03-14
Journal Article
2016-01-9108
Ji Xu, Guohua Sun, Tao Feng, Mingfeng Li, Teik Lim
Abstract Active noise control systems have been gaining popularity in the last couple of decades, due to the deficiencies in passive noise abatement techniques. In the future, a novel combination of passive and active noise control techniques may be applied more widely, to better control the interior sound quality of vehicles. In order to maximize the effectiveness of this combined approach, smarter algorithms will be needed for active noise control systems. These algorithms will have to be computationally efficient, with high stability and convergence rates. This will be necessary in order to accurately predict and control the interior noise response of a vehicle. In this study, a critical review of the filtered-x least mean square (FXLMS) algorithm and several other newly proposed algorithms for the active control of vehicle powertrain noise, is performed. The analysis examines the salient features of each algorithm, and compares their system performance.
2016-03-07
Article
The POSIWIRE sensor WS21 from ASM Sensors is designed for measuring ranges up to 20,000 mm.
2016-03-06
Article
Cambustion’s DPG, an automated particle filter testing system, can be used to load diesel particulate filters (DPFs) and now gasoline particulate filters (GPFs) with ash over a matter of hours, the company claims. This is a new application of the DPG for studying the effects of ash build-up in particulate filters.
2016-03-04
Article
A solution from Spirent Communications will help reduce the development time and cost of automotive Ethernet/BroadR-Reach systems.
2016-03-03
Magazine
Multi-material structures move mpg upward The quest to improve fuel economy is not waning, nor is the desire to achieve higher mpg through the use of just the right lightweight material for the right vehicle application. Cars poised to become 'a thing' Making automobiles part of the Internet of Things brings both risks and rewards. Agility training for cars Chassis component suppliers refine vehicle dynamics at the high end and entry level with four-wheel steering and adaptive damping. SAE 2016 World Congress Preview Technology trends and exhibitor products are highlighted in this special section, which features Toyota's plans for the show floor, tech sessions, and more.
2016-03-01
Article
The growing role of electronics and software is altering the design process, requiring a greater focus on validation and verification, particularly to meet the stringent demands of off-highway environments.
2016-02-29
Article
Three SAE standards are to be incorporated in EPA regulations, including refrigerant identification, built-in or via USB on hand-held units, incorporated in requirements for recovery/recycle/recharge equipment. There's also a standard for testing internal heat exchangers in development.
2016-02-11
WIP Standard
AIR1839D
This Aerospace Information Report (AIR) is a general overview of typical airborne engine vibration monitoring (EVM) systems applicable to fixed or rotary wing aircraft applications, with an emphasis on system design considerations. It describes EVM systems currently in use and future trends in EVM development. The broader scope of Health and Usage Monitoring Systems, (HUMS ) is covered in SAE documents AS5391, AS5392, AS5393, AS5394, AS5395, AIR4174.
2016-02-03
Article
Britain has established a real-world test highway for connected and autonomous vehicle technologies. JLR is one of the companies investing in the 66-km-long R&D route.
2016-02-02
Article
Imetrum’s precision, noncontact 3D measurement system, the Precision Displacement Tracker, slashes setup times and provides richer data sets without compromising measurement resolution or sampling speed.
2016-02-02
Article
Intertek’s Milton Keynes Transportation Technologies laboratory has developed a portable vehicle exhaust emissions testing system that enables manufacturers to report real-world driving emissions.
2016-02-02
Article
EngineLab’s EL129 control units for engine simulation and testing have a range of input and output options and can be adapted for flexible control system development.
2016-02-01
Technical Paper
2016-28-0039
Vijay Antony John Britto, Sudipto Karmakar, Madhan Muthuveeraswamy, Balasubramanian Natarajasundaram
NVH refinement of a vehicle with light weight structure[1] focusing on fuel efficiency is a challenging task. Resonance between the air volume of the cabin and revolving engine excitation generates booming. This booming noise affects the annoyance of sound quality in the cabin. Engine torque variation, penetration of air intake and exhaust system, and tire unbalance caused by engine auxiliary resonance are the most influential sources for high speed booming. This paper describes the booming noise level reduction between 100-200 Hz during high RPM driving conditions in one of the passenger cars. Detailed CAE iterations and testing has been done to identify the root cause of the booming noise. By considering the cost vs NVH performance trade off, the optimized NVH countermeasure has been chosen and validated. Modal analysis, operational deflection shapes, Input point inertance and Noise transfer function techniques have been used for root-cause analysis and counter measure proposal.
2016-02-01
Technical Paper
2016-28-0068
Nishant Kataria, Kota Nageswara rao Puli, Pankaj Maheshwari, Sandeep Raina
Abstract In automotive seating, there are multiple applications wherein parts have relative motions. During the relative motion of parts, noise is generated due to friction which can be irritant to the end user. This paper focuses on, one such application where conventional noise reduction solutions like grease application are not very effective. Typically, Seats can have two types of Head Restraint, a) Adjustable, b) Non Adjustable. In Adjustable type of Head restraint, during adjustment by the end user, head restraint rod rubs against the metal plate inside the locking guide. This creates friction and that in turn results in noise. The paper focuses on understand the phenomenon of noise, identifying the root cause and studying about potential solutions to reduce the noise to acceptable level. In this paper, parameters affecting the noise are studied and evaluated.
2016-02-01
Technical Paper
2016-28-0233
Sindhu Ls, Vishwas Vaidya
Abstract The OEM's aim is to reduce development time and testing cost, hence the objective behind this work is to achieve a flexible stateflow model so that changes in the application during supply chain or development, on adding/deleting any switches, varying timer cycle, changing the logic for future advancements or else using the logic in different application, would end in minimal changes in the chart or in its states which would reflect least changes in the code. This research is about designing state machine architecture for chime/buzzer warning system and wiper/washer motor control system. The chime/buzzer stateflow chart includes various input switches like ignition, parking, seat belt buckle, driver door and speed accompanied with warning in the form of LED, lamp and buzzer. The logic is differentiated according to gentle and strong warning. Various conditions and scenarios of the vehicle and driver are considered for driver door and seat belt which is resolved in the chart.
2016-02-01
Technical Paper
2016-28-0143
K. Krishnamoorthy, V. Saishanker
Abstract With increasing growth of vehicular population, there is an increasing demand for raw materials. This has added strain to the available resources, which is becoming more and more unsustainable. As a result, search for sustainable materials are continuously happening in our industry and there is a strong focus from everyone to incorporate more and such materials. One way of doing so, is by blending naturally available materials like fibers, with polymers. In this study, naturally available Coconut fibers have been blended successfully with Polyurethane foam, thereby improving the green footprint of the vehicle. Coconut fibers are naturally occurring fiber extracted from the husk of the coconut. Polyurethane foam is the most versatile polymeric foam used in several places of automobile for reducing the Noise, Vibration & Harshness. The composite was manufactured using reaction injection molding technique by reacting polyol with iso-cyanide.
2016-02-01
Technical Paper
2016-28-0239
Sri Siva Sai Meduri, V Sundaram, S. Sathish Kumar
Abstract Noise reduction is a major concern in the recent times and global automotive industries evolve new technology to meet the norms. The major contribution to vehicle’s interior noise is from engine, intake, exhaust, structure, aerodynamic and road. In recent days, more attention is given to other sources of noises which are dominant. Purge noise is one such noise which has more impact to the interior noise because the cabin has become much quieter due to the latest advancements and new technologies used in vehicle design and development. Using the air dampening device in the vapor line is one of the techniques to minimize the purge noise. In this paper a study is carried out in order to optimize the design of air dampening device which meets the requirements. Fuel vapors that got collected in canister will purge through vapor line and are controlled by purge valve before they enter the engine.
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