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Viewing 1 to 30 of 7781
2017-10-02 ...
  • October 2-6, 2017 (8:00 a.m. - 8:00 p.m.) - Troy, Michigan
Training / Education Classroom Engineering Academies
This Engineering Academy covers a variety of vehicle noise control engineering principles and practices. Two specialty tracks are available: Vehicle Interior Noise and Powertrain Noise. While the Vehicle Interior Noise track focuses on the understanding and application of acoustical materials to optimize NVH in the passenger or operator compartment of a vehicle, the Powertrain Noise track focuses on NVH issues generated by powertrain noise sources and the design strategies to minimize them. Noise sources include engines, transmissions/transfer cases, accessories, exhaust, gears, axles, joints, and couplings.
2017-10-02 ...
  • October 2-6, 2017 (8:00 a.m. - 8:00 p.m.) - Troy, Michigan
Training / Education Classroom Engineering Academies
This Engineering Academy covers a variety of vehicle noise control engineering principles and practices. Two specialty tracks are available: Vehicle Interior Noise and Powertrain Noise. While the Powertrain Noise track focuses on NVH issues generated by powertrain noise sources and the design strategies to minimize them, the Vehicle Interior Noise track focuses on the understanding and application of acoustical materials to optimize NVH in the passenger or operator compartment of a vehicle. Considerable attention is given to current measurement and instrumentation technologies and their effective use.
2017-08-15 ...
  • August 15-17, 2017 (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.
2017-08-01 ...
  • August 1-10, 2017 (4 Sessions) - Live Online
Training / Education Online Web Seminars
This four-session web seminar provides a detailed understanding of the source – path-receiver relationship for developing appropriate sound package treatments in vehicles, including automobiles, commercial vehicles, and other transportation devices. The course provides a detailed overview of absorption, attenuation (barrier), and damping materials and how to evaluate their performances on material, component, and vehicle level applications. A significant part of this course is the case studies that demonstrate how properly designed sound package materials successfully address vehicle noise issues.
2017-06-15 ...
  • June 15-16, 2017 (8:30 a.m. - 4:30 p.m.) - Grand Rapids, 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.
2017-04-21 ...
  • April 21, 2017 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
  • September 29, 2017 (8:30 a.m. - 4:30 p.m.) - Orlando, Florida
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.
2017-04-06
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.
2017-04-06
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.
2017-04-06
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.
2017-04-05
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.
2017-04-05
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.
2017-04-05
Event
This session addresses transmission noise, vibration, rattle issues and design solutions.
2017-04-05
Event
This session addresses transmission noise, vibration, rattle issues and design solutions.
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.
2017-03-28
Technical Paper
2017-01-1050
George Nerubenko, Cyril Nerubenko
The study of dynamical performance and effectiveness of new proposed system of vibration dampers for any type of propulsion (Electric Motor Cars, Hybrid Vehicles and Petrol Engine Automobiles) is presented. Design and structure of proposed system is based on George Nerubenko US Patents 7,438,165 and 7,464,800 having the control system with self-tuning contour adjusted for all operational frequencies in running propulsion. The proposed system of vibration damper configurations having the simplest mechanical variable damping devices is observed. The proposed system of vibration dampers consists of combination of patented Bending / Torsional Vibration Dampers and Flywheels. The developed schemes would be applied for a design of all kinds of powertrains, transmissions, and drivelines successfully replacing the conventional vibration reduction tools.
2017-03-28
Technical Paper
2017-01-1072
Jelena Andric
Variable valve actuation (VVA) plays a promising role in supporting advanced combustion methods to meet increasingly stringent fuel efficiency and emission standards in modern vehicles. Much research has been done on VVA to exploit its potential for increasing the overall engine performance. Consequently, the use of VVA in internal combustion engines (ICE) has become more prevalent in recent past. Different flexible VVA technologies have been designed and manufactured to make it possible to control valve events and valve timing over the entire operating range of an engine. Therefore, it is of high interest to comprehensively understand the benefits of numerous VVA mechanisms that can be used to ensure the flexibility of the valve train system. Variable valve timing (VVT) technologies include early or late opening or closing time of the intake or exhaust valves. VVA combine any method of valve timing with variable lift, phase, and duration.
2017-03-28
Technical Paper
2017-01-1063
Tonghang Zhao, Xining Liu, Meng Yang, Yulei He, Hangsheng Hou
In contrast with conventional ICE vehicles, hybrid electric vehicles have their unique power flow structure and operating conditions, which complicates HEV’s NVH performance and design. At present, the HEV programs are mostly carried over from their corresponding conventional counterparts for many OEM’s. As a result, the total vehicle weight will increase 10% to 15% compared to their conventional version. However, the vehicle structural characteristics, such as hard points and chassis suspension stiffness, still remains similar to their conventional version. Therefore, even under the same operating conditions, HEV’s might develop more serious and complicated NVH problems. In this work, the structural and operating characteristics of an HEV is briefly explained first. Based on the principle of vibration and noise control methodology, the most effective NVH control strategies under typical HEV operating conditions are looked into and presented.
2017-03-28
Technical Paper
2017-01-1122
Yashodhan V. Joshi
Vehicle noise has reduced over the years due to the customer demand for quieter vehicles. As engines have become quieter by efforts to reduce the combustion noise, as well as, by moving away from mechanical fuel pumps to common rail fuel pumps, the geartrain noise has come under increased scrutiny. Gear whine could be a result of multiple factors, and gear profile distortion is one of those factors. ISO 10064 provides guidance on the distortion due to temperature effects, but does not describe other influences in detail. There is not much published literature about gear whine due to profile distortion. The work attempts to fill that gap by describing a gear whine problem due to profile distortion and load change and it’s resolution by changing the gear design.
2017-03-28
Technical Paper
2017-01-0448
Prakash T. Thawani, Stephen Sinadinos, John zvonek
Prakash Thawani, Steve Sinadinos and John Zvonek DENSO International America Inc. Southfield, MI Abstract With the advent of EVs/HEVs and implementation of Idle-Stop-Start (ISS) technologies on internal combustion engine driven cars/trucks to improve fuel economy and reduce pollution, refrigerant sub-system (RSS) induced noise phenomena like, hissing, gurgling and tones become readily audible and can result in to Customer complaints and concerns. One of the key components that induces these noise phenomena is the Thermal Expansion Valve (TXV). The TXV throttles compressed refrigerant through the evaporator that results in air-conditioning (A/C) or thermal system comfort and defogging when needed. Under certain operating conditions, the flow of gas and/or liquid/gas refrigerant at high pressure and velocity excites audible acoustical and structural modes inherent in the tubing/evaporator/HVAC case.
2017-03-28
Technical Paper
2017-01-0444
Weiguo Zhang, Mark Likich, Brian Butler, John White
Engine air induction shell noise is a structure borne noise that radiates from the surface of the air induction system. The noise is driven by pulsating engine induction air and is perceived as annoying by vehicle passengers. The problem is aggravated by vehicle design demands for low weight components packaged in an increasingly tight under hood environment. Shell noise problems are often not discovered until production intent parts are available and tested on the vehicle. Part changes are often necessary which threatens program timing. Shell noise can negate air induction NVH development by overriding acoustic abatement features such as Helmholtz resonators and large air boxes. Shell noise should be analyzed in the air induction system design phase and a good shell noise analytical process and targets must be defined. A numerical analytical process is developed to predict the radiated sound power of air induction components.
2017-03-28
Technical Paper
2017-01-1051
Hassan nehme, Abdelkrim Zouani
Turbocharged engines constitute one of the strategies used by Ford Motor Company to deliver engines with improved fuel economy and performance. However, turbochargers exhibit many inherent NVH challenges that need to be addressed in order to deliver refined engines that meet customers’ expectations. One of these challenges is the turbocharger 1st order synchronous noise due to the interaction between the manufacturing tolerances of the rotating components and the dynamics of the rotor. This paper presents an analytical method to compute the turbocharger bearing forces and predict the 1st order synchronous noise and vibrations. The method consists of a fully coupled turbocharger rotor dynamic analysis in a flexible turbocharger housing structure; it predicts housing vibrations under various manufacturing tolerance conditions. The predicted vibrations of the turbocharger housing are compared to measured test data to demonstrate the validity of the analytical method.
2017-03-28
Technical Paper
2017-01-1062
Abdelkrim Zouani, Gabriela Dziubinschi, Vidya marri, Simon Antonov
In modern automotive engines, Variable Displacement Oil Pump (VDOP) is becoming the pump of choice to reduce friction and deliver stringent fuel economy. However, this pump creates pressure ripples, at the outlet port during a complete shaft rotation, causing oscillating forces within the system and leading to the generation of tonal noises and vibrations. In order to minimize the level of noise different porting geometries and vane spacing are used. This paper presents an optimization method intended to identify the best possible spacing for the conventional 7-vanes and 9-vanes oil pumps. The method integrates a Matlab based oil pressure trace model into Mode Frontier computation platform. Bench tests are performed on several pumps with different vane spacing to measure the harmonics of the pressure ripples at the pump outlet in order to validate the results of the optimization study.
2017-03-28
Technical Paper
2017-01-1061
Jiachen Zhai, Lu Cao
Electric vehicle driving permanent magnet synchronous motor has a wide speed range and load changes, with abundant harmonic currents, and its eccentric form is complex, which all result in poor sound quality and abnormal noise problems becoming increasingly prominent. To make a systematic and thorough study of the centralized drive permanent magnet synchronous motor (PMSM) is significant to ameliorate the sound quality and solve noise problems. MATLAB-based modeling technology, SPSS software, and the establishment of sound quality evaluation model for the centralized drive PMSM has a crucial reference value on the research and development of the electric vehicle driving permanent magnet synchronous motor. As for the sound quality of centralized drive PMSM, firstly, in order to get objective parameter values, evaluation models of objective parameters based on psychological acoustics should be established after the collection of the sound samples.
2017-03-28
Technical Paper
2017-01-1052
Paul Zeng, Vincent Solferino, Mark Stickler
Engine ticking noise is one of the key failure modes in today’s direct injection (DI) engines. High ticking noise results in high Things Gone Wrong (TGW) index, which negatively affects customer satisfaction. In this paper, the root cause of the ticking noise from DI injector in direct mounting will be presented. Design principle such as injector impact force to cylinder head and DI injector isolator design with 2 stage stiffness is proposed.
2017-03-28
Technical Paper
2017-01-1057
Paul Zeng, Debabrata Paul, Vincent Solferino, Mark Stickler
Valvetrain ticking noise is one of the key failure modes in noise vibration harshness (NVH) evaluation at idle. It affects customer satisfaction inversely. In this paper, the root cause of the valvetrain ticking noise and key parameters that impact ticking noise will be presented. A physics based math model has been developed and integrated into a parameterized multi-body dynamic model. The analytical prediction has been correlated with testing data. Valvetrain ticking noise control is discussed.
2017-03-28
Technical Paper
2017-01-1120
Kenji Tsutsumi, Yoshitaka Miura, Yusuke Kageyama, Arata Miyauchi
A CVT variator chain system is superior in efficiency to a variator belt system because of its lower internal friction. However, a chain produces more noise than a belt due to the long contact length between the rocker pins and pulley sheaves. This paper focuses on optimization of the link arrangement pattern (pitch sequence) in order to reduce chain noise. The current pitch sequence puts links of different lengths together appropriately and reduces the peak level of 1st-order chain noise by improving noise dispersibility. First, the object function for optimization was defined as the reduction of the peak level of 1st-order chain noise combined with a well-balanced chain noise level of low and high frequency bands. Road noise and wind noise as transmission background noise have the characteristic that they increase as the frequency decreases.
2017-03-28
Technical Paper
2017-01-1070
Da Shao, Xu Sichuan, Aimin Du
The electromagnetic valve actuator (EMVA) is considered a technological solution for decoupling between crankshaft and camshaft to improve engine performance, emissions, and fuel efficiency. Conventional EMVA consists of two electromagnets, an armature, and two springs has been proved to have the drawbacks of fixed lift, impact noise, complex control method and large power consumption. This paper proposes a new type of EMVA that use voice coil motor (VCM) as electromagnetic valve actuator. This new camless valvetrain (VEMA) is characterized by simple structure, flexible controllable and low actuating power. VCM provides an almost flat force versus stroke curve that is very useful for high precision trajectory control to achieve soft landing within simple control algorithm.
Viewing 1 to 30 of 7781

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