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Viewing 1 to 30 of 9318
2016-10-24
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.
2016-08-02 ...
  • August 2-4, 2016 (2 Sessions) - Live Online
Training / Education Online Web Seminars
This web seminar provides an in-depth overview of diesel engine noise including combustion and mechanical noise sources. In addition, the instructor will discuss a system approach to automotive integration including combining sub-systems and components to achieve overall vehicle noise and vibration goals.
2016-06-08 ...
  • June 8, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
The influx of different hybrid and electric vehicle configurations has brought about unique NVH challenges from a variety of sources. NVH refinement is an important aspect of powertrain development and the vehicle integration process. While developing the NVH behavior of the vehicle is critical to satisfy customer expectations, it is also important to consider the influence of reduced exterior noise levels on pedestrian safety.
2016-06-08 ...
  • June 8-15, 2016 (3 Sessions) - Live Online
  • 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.
2016-05-23 ...
  • May 23-June 3, 2016 (6 Sessions) - Live Online
  • 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.
2016-04-25 ...
  • April 25-26, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
The sound package materials for vehicle noise control seminar provides a detail and thorough analysis of three different classes of acoustical materials – namely absorbers, barriers, and dampers, how they are different from each other, and acoustical properties that materials should possess for optimum vehicle noise control. The seminar addresses new advances in acoustical materials, primarily in absorption materials that impact the vehicle acoustics. The seminar covers ways to evaluate the acoustical performance of these materials using different test methods, including material, component, and vehicle level measurements.
2016-04-14
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.
2016-04-14
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.”
2016-04-14
Event
This session will cover intake/exhaust/powertrain and chassis noise and vibration. Papers covering vehicle interior comfort, advanced methods and subjective response are also welcome
2016-04-14
Event
This session will cover intake/exhaust/powertrain and chassis noise and vibration. Papers covering vehicle interior comfort, advanced methods and subjective response are also welcome
2016-04-13
Event
This session will cover intake/exhaust/powertrain and chassis noise and vibration. Papers covering vehicle interior comfort, advanced methods and subjective response are also welcome
2016-04-13
Event
This session will cover intake/exhaust/powertrain and chassis noise and vibration. Papers covering vehicle interior comfort, advanced methods and subjective response are also welcome
2016-04-13
Event
This session addresses transmission noise, vibration, rattle issues and design solutions.
2016-04-11 ...
  • April 11, 2016 (8:30 a.m. - 4:30 p.m.) - Detroit, Michigan
  • September 29, 2016 (8:30 a.m. - 4:30 p.m.) - Scottsdale, Arizona
Training / Education Classroom Seminars
Brake Noise, Vibration, and Harshness (NVH) is recognized as one of the major problems currently faced by the automotive manufacturers and their suppliers, with customers warranty claims of more than $100 million per year for each manufacturer. With increasing consumer braking performance expectations, automotive OEM’s and suppliers need the ability to predict potential problems and identify solutions during the design phase before millions of dollars have been spent in design, prototyping, and manufacturing tooling.
2016-04-05
Journal Article
2015-01-9152
André Lundkvist, Arne Nykänen, Roger Johnsson
Abstract Many of the information systems in cars require visual attention, and a way to reduce both visual and cognitive workload could be to use sound. An experiment was designed in order to determine how driving and secondary task performance is affected by the use of information sound signals and their spatial positions. The experiment was performed in a driving simulator utilizing Lane Change Task as a driving scenario in combination with the Surrogate Reference Task as a secondary task. Two different signal sounds with different spatial positions informed the driver when a lane change should be made and when a new secondary task was presented. Driving performance was significantly improved when both signal sounds were presented in front of the driver. No significant effects on secondary task performance were found. It is recommended that signal sounds are placed in front of the driver, when possible, if the goal is to draw attention forward.
2016-04-05
Journal Article
2015-01-9153
André Lundkvist, Arne Nykänen
Abstract The number of advanced driver assistance systems is constantly increasing. Many of the systems require visual attention, and a way to reduce risks associated with inattention could be to use multisensory signals. A driver's main attention is in front of the car, but inattention to surrounding areas beside and behind the car can be a risk. Therefore, there is a need for driver assistance systems capable of directing attention to the sides. In a simulator study, combined visual, auditory and vibrotactile signals for directional attention capture were designed for use in driver assistance systems, such as blind spot information, parking assistance, collision warnings, navigation, lane departure warning etc. An experiment was conducted in order to measure the effects of the use of different sensory modalities on directional attention (left/right) in driver assistance systems.
2016-04-05
Technical Paper
2016-01-1120
Dong Guo, Quan Shi, Peng Yi
Gear drives are widely used in the transmission of many types of vehicles and various gear faults were reported to have different effects on the performance of transmission systems. The psychoacoustics metrics, which are used to represent the human hearing property, are objective indicators of product sound quality performance. Therefore, psychoacoustic analysis of gear noise with gear faults needs to be conducted. In this paper, different types of gear faults are summarized, and three of them, including wear, misalignment and eccentricity, are studied separately in the psychoacoustic analysis of the synthesized noise signal of an example gearbox. The gear noise spectra for the cases with different gear faults are synthesized based on the findings of previous publications, where it shows that the three gear faults can either increase the amplitude at the harmonics of the gear mesh frequency or cause the sideband responses.
2016-04-05
Technical Paper
2016-01-1056
Vikas Kolage, Santosh Madireddy
The heart and soul of any fuel based automobile is its engine, which forms the powerhouse generating energy required for movement. Since its inception, it forms the most crucial part of any vehicle. It is therefore safe to say that necessity driven innovations are aimed at engine and its related components than any other aggregate of an automobile. The laws of physics which provide this power also constraint the applicability of engines in automobiles. Due to the oscillating motion generated inside cylinders, forces of imbalance are prevalent throughout the mechanism. While primary forces are usually done and dealt by placing counterweights on crankshaft, secondary forces are eliminated through various different accepted measures. The elimination of imbalances isn’t enough to reduce the shake of an engine and hence we need Engine Mounts for this purpose. They absorb the vibrations produced and eliminate chances of coupling and superposition.
2016-04-05
Technical Paper
2016-01-1128
Bo Peng, Tao Liu, Sifa Zheng, Xiaomin Lian
Neutral-idle strategy has been applied for years to improve the fuel consumption of automatic transmission cars. The updated demand is the use of expanded slipping control for further improvement of the transmission efficiency. However, there are the cases of vibration issues caused by slip-controlled clutches. This issue is called shudder as typical problem of vehicle vibration. In this research, a special neutral-idle shudder phenomenon is presented. Experimental research is conducted to give an insight view of this phenomenon. Then, vibration signal analysis is performed in details to reveal the mechanism. The analysis reveals that this special shudder is caused by both torsional vibration of the driveline and planar vibration of the powertrain system. A positive feedback loop between those two kinds of vibrations contributes to the creation of this neutral-idle shudder.
2016-04-05
Technical Paper
2016-01-0220
Ban Gu, Xiaohong yuan
With great development of thermoelectric exhaust heat recovery technology, more and more attention has been paid to optimization of automotive thermoelectric generators (ATEGs). A lot of work has been done on optimization of flow field and thermal analysis, however work that focuses on acoustic optimization is not too much. In this paper, efforts have been paid to research acoustic performance of a flat-plate TEG, and to check out the feasibility of integration of automotive exhaust thermoelectric generator with muffler. The internal configuration of heat exchanger looks like “fishbone”. Four factors have been taken into consideration: the spacing of two fins, angle of the fins, the diameter of inlet and outlet of exchanger, and filling sound absorbing material in heat exchanger chamber. Based on these four factors, acoustic analysis was carried out.
2016-04-05
Technical Paper
2016-01-0431
Guangqiang Wu, Huwei WU, Xiang Chen
During the process of vehicle creeping, severe vibro-impacts of unloaded or lightly loaded gear pairs in a manual transmission may occur in the powertrain system due to some nonlinear characteristics. Multi-staged stiffness clutch damper, as a main nonlinear component, could have a great influence on powertrain system torsional vibration performance. So a mass-production passenger sedan is taken as the research subject and the nonlinear characteristics impact of multi-staged stiffness clutch damper for vehicle creeping vibration is investigated by using lumped-parameter modeling method. Firstly, a quasi-transient model of an inline four-cylinder and four-stroke engine, based on measured data of cylinder gas pressure versus crankshaft angle, is derived. Effective output torque is achieved and as the input excitation to the driveline. Secondly, a 12 DOFs (Degrees of Freedom) nonlinear and branched torsional vibration model is established.
2016-04-05
Technical Paper
2016-01-1127
Enrico Galvagno, Guido Ricardo Guercioni, Alessandro Vigliani
This paper presents a methodology for the assessment of the NVH performance of a DCT depending on some transmission design parameters, e.g. torsional backlash in the synchronizers, clutch disk moment of inertia, etc., during low vehicle speed maneuvers. Firstly, a 21-DOFs nonlinear dynamic model of a C-segment passenger car equipped with a DDCT is presented. From the torsional variables computed during simulation, the forces at the bearings that support the transmission shafts are calculated; both the axial and radial component of each bearing force are estimated through the model. It has been noted that an impact between the teeth of two engaging rotating components, e.g. gears and synchronizers, corresponds to an impulse in the simulated forces, which leads to a bearing force time-history characterized by a very rich frequency content. A broad band excitation is therefore applied to the gearbox case thus generating noise and vibration issues.
2016-04-05
Technical Paper
2016-01-1378
TAKANORI IDE, Kentaro TODA, Yasunori Futamura, Tetsuya Sakurai
Efficient method to solve large-scale eigenvalue computation in vibration is presented. NVH(Noise, Vibration and Harshness) performance is an important quality measure of the vehicle. Therefore the reduction of vibration is one of the key considerations of new automatic transmission design. In addition, accelerating product design time is another important issue. Computer Aided Engineering (CAE) is becoming a more important methodology to reduce product design time. However computational time of eigenvalue problem takes a long. We propose parallel eigenvalue computation (Sakurai-Sugiura method) for large-scale eigenvalue problems. This method has a good parallel scalability according to a hierarchical structure of the method. As a demonstrative problem, we consider large-scale eigenvalue computation of the AISIN AW FWD automatic transmission.
2016-04-05
Technical Paper
2016-01-1063
George Nerubenko
Up to 30% of engine noise is delivered by front end pulley combined with torsional vibration damper, and technically it is the main contributor to recorded engine noise level. So the novel solutions in terms of improving the design and performance of torsional vibration damper would help to reduce radically this component of engine noise. The results of dynamical study of patented torsional vibration damper combined with pulley are presented. Design and structure of torsional vibration damper is based on author’s US Patent 7,438,165 having the self-tuning control system for all frequencies in running engine in all operational regimes. Mathematical model has been used for the analysis of the emitting noise of engine having proposed torsional vibration damper. Attention is paid to mitigation of the sound power levels contributing by engine subsystem “end of crankshaft - torsional vibration damper – pulley”.
2016-04-05
Technical Paper
2016-01-0472
Lianhui Wang, Shuming Chen, Dengfeng Wang, Yang Jiang, Jing chen
With the development of modern transportation industry, noise pollution is becoming a serious problem. Thus how to reduce noise becomes a hot topic. The most commonly used method is the use of porous sound absorption materials. There are different ways to predict the sound absorption performance of the materials. One of them is genetic algorithm. It can intuitively find critical information that cannot be found in theory. Genetic algorithm is an excellent simulation method. It acquires the optimal solution by imitating the natural selection and genetic mechanism. Therefore, the solution is more close to the target solution after multiple optimizations. The purpose of the present study is to propose a novel approach applying the genetic algorithm to predict the porous materials' sound absorption properties. In this paper we use the foam as the porous material.
2016-04-05
Technical Paper
2016-01-1058
Naoki Toyama, Takashi Hoshi
This paper reports on technology for suppressing forced vibration of the multiplate wet clutch used in the automatic transmission of recently released hybrid automobiles. This study constructed technology for predicting forced vibration due to the clutch structure by 3-D Simulation model, and estimated the vibration modes that would occur. Next, running modes with severe forced vibration were extracted using a drivetrain torsional vibration by 1-D Simulation model from the engine to the driveshaft and the vibration target values estimated from the body. These results were used to change to a clutch structure that has sufficient margin with respect to the forced vibration targets and to appropriately adjust the running modes. It was then confirmed using an actual vehicle that forced vibration does not occur in the running mode estimated to have the most severe forced vibration.
Viewing 1 to 30 of 9318

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