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Viewing 1 to 30 of 9479
2017-04-04
Event
This session addresses transmission noise, vibration, rattle issues and design solutions.
2017-04-04
Event
The design, development, and testing of Valve Train and Variable Valve Actuation mechanisms, devices, and systems; and the impact and control of such systems on thermodynamics, combustion, fuel economy, emissions, noise and vibration, and performance.
2017-04-04
Event
This session sets out to reflect the recent advances on the research, development and practices of Powertrain NVH treatment. The technical papers are of interest to powertrain system designers, testing specialists, NVH experts, and other individuals who evaluate and develop technologies to control powertrain NVH. The coverage includes: engine, engine subsystem and components noise and vibration; powertrain systems noise measurement and instrumentation; powertrain systems noise analysis.
2017-04-04
Event
This session covers the development and application of numerical methods along with test correlation and optimization for NVH issues of full vehicle and vehicle subsystems. All structural components, subsystems and complete systems found in automotive vehicles will be considered. Topics include structure NVH, vibro-acoustics, wind noise and aeroacoustics, intake/exhaust and vehicle interior noise, sound quality etc.”
2017-01-15
Book
This is the electronic format of the Journal.
2016-12-05 ...
  • December 5-16, 2016 (6 Sessions) - Live Online
Training / Education Online Web Seminars
Finite Element Analysis (FEA) has been used by engineers as a design tool in new product development since the early 1990's. Until recently, most FEA applications have been limited to static analysis due to the cost and complexity of advanced types of analyses. Progress in the commercial FEA software and in computing hardware has now made it practical to use advanced types as an everyday design tool of design engineers. In addition, competitive pressures and quality requirements demand a more in-depth understanding of product behavior under real life loading conditions.
2016-11-29 ...
  • November 29-December 6, 2016 (3 Sessions) - Live Online
Training / Education Online Web Seminars
This web seminar will provide an introduction to the characteristics of sound waves, human perception of sound, sound and vibration measurements, measurement facilities, and various noise sources and noise control principles. It will include an overview of sound pressure, power, intensity, decibels, and frequencies. Practical examples will be used to familiarize participants with the acoustic fundamentals for solving noise and vibration problems and the associated solution principles.
2016-11-15
Event
All aspects of small engine related noise and vibration are covered in this session including: generation, experimental techniques, measurement, numerical analysis, NVH materials, source identification, NVH quality and novel solutions.
2016-11-15
Event
All aspects of small engine related noise and vibration are covered in this session including: generation, experimental techniques, measurement, numerical analysis, NVH materials, source identification, NVH quality and novel solutions.
2016-11-08
Technical Paper
2016-32-0041
Chao-Kai LI, Jia-Siou wu, Yuh-Yih Wu
Today, motorcycle is one of the main noise pollution in Asia. In addition, the design of motorcycle muffler is closely related with how noise is made as the regulation is getting crucial these years. Therefore, Transmission Loss (TL) is an important index to evaluate the characteristic of muffler, but conventional trial and error method results in time wasting muffler tests. In this paper, in order to shorten the development period, Ricardo WAVE software is used to discuss the simulate analysis TL of motorcycle muffler. In this paper uses the huge heavy motorbike (400cc) made from manufacture to simulate TL. Due to the complex interior design of the target muffler which is mainly made of simple elements, this research put simulate analysis on simple elements like single chamber, non-coaxial and insert expansion chamber, clapboard chamber and sound absorbing materials at first place. There are three goals in this research.
2016-11-08
Technical Paper
2016-32-0040
Sagar K P
The demand for quieter and low vibration vehicles is an ever increasing demand mainly because of customer expectations. In a motorcycle vibration at tactile points like the handlebar, rider seat and rider footrest determine the vibration characteristic of the vehicle. Motorcycle vibration control powered by a single cylinder engine is an uphill task. Crankshaft balancing plays a major role in this regard. Understanding the unbalance forces hence becomes quintessential. In this work a simple analytical method is proposed to calculate the unbalance forces, its direction of action etc. The analytical results are correlated with software analysis results conducted using a multi-body dynamics software. Trials are conducted by changing the direction of action of the unbalanced force using the above said analytical method to optimize the balancing. The analytical method is then developed for an engine having a balancer shaft and crank offset.
2016-11-08
Technical Paper
2016-32-0043
Bernhard J. Graf, Christian Hubmann, Markus Resch, Mehdi Mehrgou
Beside hard facts as performance, emissions and fuel consumption especially the brand specific attributes such as styling and sound are very emotional, unique selling prepositions. To develop these emotional characters, within the given boundary conditions of the future pass-by regulation, it is necessary to define them at the very beginning of the project and to follow a consequent development process. The following paper shows examples of motorcycle NVH development work on noise cleaning and sound engineering using a hybrid development process combining front loading, simulation and testing. One of the discussed solutions is the investigation of a piston pin offset in combination with a crankshaft offset for the reduction of friction. The optimization of piston slap noise as a result of the piston secondary motion was performed by simulation. As another example a simulation based development was performed for the exhaust system layout.
2016-11-08
Technical Paper
2016-32-0044
Gaku Naoe
One of the issues involved in compression ignition combustion is the increase in combustion noise from engine mechanical systems caused by rapid combustion. When using natural gas of high ignition temperature in the fuel, the compression ratio is increased relative to gasoline, and combustion becomes more rapid. The present research pursues the issue of noise by clarifying the distinctive features of combustion noise through tests focused on the two topics of stroke bore ratio (S/B ratio), and ignition timing. In order to verify S/B ratio and in-cylinder pressure change rate, combustion noise was measured in five types of engine with the same displacement and the S/B ratio varying from 0.8 to 2.1. The test results seemed that the effect of input load reduction due to the smaller bore caused a reduction in combustion noise at the same in-cylinder pressure change rate.
2016-11-08
Technical Paper
2016-32-0039
Andrea Fioravanti, Giovanni Vichi, Isacco Stiaccini, Giovanni Ferrara, Lorenzo Ferrari
In recent years, the motorcycle muffler design are moving to dissipative silencer architectures. Indeed due to the increase of restrictions on noise emissions both dissipative and coupled reactive-dissipative mufflers, thanks to their higher noise efficiency coupled with a size reduction, have substituted the reactive silencers. A dissipative muffler is composed by a perforated pipe that crosses a cavity volume that is usually 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 of the porous material. The interaction between these elements and the mass flow rate of gas passing through the silencer influences the muffler performance.
2016-11-08
Technical Paper
2016-32-0042
Bhaarath Rajagopal Jeyapaal, Vamsi Krishna, Kannan Marudachalam
    Vibrations have become an increasingly important attribute for determining the quality of automotive products. Particularly, this becomes more acute in the case of tactile vibrations of powered two-wheelers – motorcycles and scooters. Increased tactile vibration comfort has become a must-be (hygiene) quality in the case of two wheelers. This papers deals with vibrations of a scooter vehicle. Scooters are normally a two-wheeler with a four stroke single cylinder spark ignited engine. Vibrations of a scooter are mainly caused by the inertial imbalance forces of the engine, combustion forces and road undulations. Vibrations due to road undulations are mostly reduced by toggle link mechanism, resilient mounts of the engine and the shock absorbing suspension of the frame. Various methods of reducing vibrations caused by the inertial imbalance forces of the engine and the combustion forces have had its fare share of success and failures.     
2016-10-26
Event
This session sets out to reflect the recent advances on the research, development and practices of Powertrain NVH treatment. The technical papers are of interest to powertrain system designers, testing specialists, NVH experts, and other individuals who evaluate and develop technologies to control powertrain NVH. The coverage includes: engine, engine subsystem and components noise and vibration; powertrain systems noise measurement and instrumentation; powertrain systems noise analysis.
2016-10-17
Technical Paper
2016-01-2311
Arun Prasath G, Saravanan Duraiarasan, Govindarajan R
Indian two wheeler market is one of the largest and highly competitive in the world. Indian scooter segment grows at a pace of around 30% YOY. The stiff competition among OEM’s to increase the market share with fuel efficient and high performance products pushes development and calibration engineers to burn the midnight oil to concoct innovative methods to design technology boosted product. Customer expectations are always high in terms of fuel economy, drivability and NVH. Due to higher level of complexity involved in CVT (Continuously Varying Transmission) engine, it is daunting task to optimize for achieving best of NVH characteristics along with Fuel Economy, drivability and reduced exhaust emission. This paper describes the experiment conducted during the development of 110cc CVT four stroke scooter engine. The development and calibration of this scooter was mainly based on real world usage pattern (RWUP).
2016-10-17
Technical Paper
2016-01-2355
Sivanesan M, Jayabalaji G
Analytical and numerical study is carried out to study the behavior of stick-slip and judder phenomenon during engaging and disengaging of the automotive clutch. For this, a four degree of freedom torsional power train lumped mass model is developed. This torsional vibration system includes engine-flywheel, clutch, gear box and vehicle drive line, which are connected to each other by shafts. Equation of motion of the system is developed and initially a stability analysis is carried out for various gradients of coefficient of friction using eigen value analysis. Later, a numerical simulation is carried out to analyze the judder and stick-slip phenomenon using commercially available mathematical tool MATLAB. It is observed that the clutch stick-slip is increased with increase in external torque and clutch pressure fluctuations.
2016-10-17
Technical Paper
2016-01-2258
Yoshihiro Okoshi, Shinsuke Kikuchi, Yuta Mitsugi, Kotaro Tanaka, Masaaki Kato, Tomoya Tsuji, Mitsuru Konno
Dimethyl ether (DME) is a promising alternative fuel for CI engines. DME features good auto ignition characteristics and soot-free combustion. In order to develop an injection system suitable for DME, it is necessary to understand the fuel properties. Sound speed is one of the important fuel properties that affects the injection characteristics. However, the measurement data under high-pressure corresponding to that in fuel injection system are lacking. Critical temperature of DME is lower than that of diesel fuel, and is close to the injection condition. Sound speed at critical point is theoretically 0 m/s. It is important to understand the behavior of the sound speed around the critical point. In this study, we measured sound speed in a wide pressure and temperature range of 1-80 MPa, 298-413 K, including the critical point. Sound speed in DME increases with pressure rises or temperature falls. It is approximately 400 m/s slower than that in diesel fuel.
2016-10-17
Technical Paper
2016-01-2343
Mark Devlin, Darryl Williams, Michael Glasgow, Karen Hux, Aaron Whitworth, Timothy Cameron
Improving vehicle fuel efficiency is a key market driver in the automotive industry. Typically lubricant chemists focus on reducing viscosity and friction to reduce parasitic energy losses in order to improve automotive fuel efficiency. However, in a transmission other factors may be more important. If an engine can operate at high torque levels the conversion of chemical energy in the fuel to mechanical energy is dramatically increased. However high torque levels in transmissions may cause NVH to occur. The proper combination of friction material and fluid can be used to address this issue. Friction in clutches is controlled by asperity friction and hydrodynamic friction. Asperity friction can be controlled with friction modifiers in the ATF. Hydrodynamic friction control is more complex because it involves the flow characteristics of friction materials and complex viscosity properties of the fluid.
2016-10-17
Technical Paper
2016-01-2178
Daniela Siano, Gerardo Valentino, Fabio Bozza, Arturo Iacobacci, Luca Marchitto
In this paper, a downsized twin-cylinder turbocharged spark-ignition engine is experimentally investigated at test-bench in order to verify the potential to estimate the peak pressure value and the related crank angle position based on vibrational data acquired by an accelerometer sensor. Purpose of the activity is to provide the ECU of additional information to establish a closed-loop control of the spark timing, on a cycle-by-cycle and cylinder-by-cylinder basis. In this way, an optimal combustion phasing can be more properly accomplished in each engine operating condition. Vibrational data are also employed to have information on cycle-by-cycle variations (CCVs) of the pressure peak. More sophisticated techniques for the control of the cycle dispersion are also foreseen. To this aim, engine behavior is firstly characterized in terms of average thermodynamic and performance parameters and CCVs at high-load operation.
2016-09-30 ...
  • September 30, 2016 (8:30 a.m. - 4:30 p.m.) - Scottsdale, Arizona
Training / Education Classroom Seminars
Brake noise is one of the highest ranked complaints of car owners. Grunts, groans, squeaks, and squeals are common descriptions of the annoying problem which brake engineers spend many hours trying to resolve. Consumer expectations and the high cost of warranty repairs are pushing the optimization of brake NVH performance. This course will provide you with an overview of the various damping mechanisms and tools for analyzing and reducing brake noise. A significant component of this course is the inclusion of case studies which will demonstrate how brake noise squeal issues have been successfully resolved.
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