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Open-Access Testbench Data for NVH Benchmarking of E-Machines under Electromagnetic Excitations

EOMYS Engineering-Karine Degrendele, Jean Le Besnerais
L2EP-Emile Devillers, Michel Hecquet
Published 2019-06-05 by SAE International in United States
This paper presents an experimental setup dedicated to the analysis of noise and vibration due to Maxwell magnetic forces in electrical machines, a significant NVH source in hybrid and electric vehicles traction motors. Both electromagnetic excitations and structural response of the electrical machine are simplified to provide the first public benchmark of e-NVH phenomenon (electromagnetic Noise, Vibration, Harshness).The paper first describes how the testbench is designed and tested in order to reduce as much as possible modelling and experimental uncertainties. A Permanent Magnet Synchronous Machine topology used in EV/HEV applications is used to illustrate tooth modulation effect and interaction between radial and tangential force-induced vibrations, and designed to generate the resonance of several stator structural modes with simplified electromagnetic loading (open-circuit case). A larger air gap allows the insertion of a fine search-coil network to measure time and space distribution of the air-gap flux density and resulting Maxwell stress harmonics. Accelerometers are placed on stator tooth tips to capture tooth bending motion, as well as on the outer yoke of the stator. Besides vibration measurements,…
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Reducing Vehicle Interior NVH by Means of Locally Resonant Metamaterial Patches on Rear Shock Towers

KU Leuven - DMMS lab, Flanders Make-Luca Sangiuliano, Claus Claeys, Elke Deckers, Bert Pluymers, Wim Desmet
MotionS lab, Flanders Make-Jasper De Smet
Published 2019-06-05 by SAE International in United States
Stringent regulations for CO2 emissions and noise pollution reduction demand lighter and improved Noise, Vibration Harshness (NVH) solutions in automotive industries. Designing light, compact and, at the same time, improved NVH solutions is often a challenge, as low noise and vibration levels often require heavy and bulky additions, especially to be effective in the low frequency regime. Recently, locally resonant metamaterials have emerged among the novel NVH solutions because of their performant NVH properties combined with lightweight and compact design. Due to the characteristic of stop band behavior, frequency ranges where free wave propagation is inhibited, metamaterials can beat the mass law, be it at least in some tunable frequency ranges. Previously the authors demonstrated how metamaterials can reduce the vibrations in a simplified shock tower upon shaker excitation. In this work, the authors apply the metamaterial concept on the real rear shock towers of a vehicle. In order to be able to benchmark the solution, a test vehicle is chosen, which is equipped in its commercial version with a 1.46 kg tuned vibration absorber…
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Use of Active Vibration Control to Improve Vehicle Refinement while Expanding the Usable Range of Cylinder Deactivation

FCA US LLC-Jeff Orzechowski, Gaurav Agnihotri, Vikas Juneja
Published 2019-06-05 by SAE International in United States
Cylinder deactivation has been in use for several years resulting in a sizable fuel economy advantage for V8-powered vehicles. The size of the fuel-economy benefit, compared to the full potential possible, is often limited due to the amount of usable torque available in four-cylinder-mode being capped by Noise, Vibration, and Harshness (NVH) sensitivities of various rear-wheel-drive vehicle architectures. This paper describes the application and optimization of active vibration absorbers as a system to attenuate vibration through several paths from the powertrain-driveline into the car body. The use of this strategy for attenuating vibration at strategic points is shown to diminish the need for reducing the powertrain source amplitude.This paper describes the process by which the strategic application of these devices is developed in order to achieve the increased usage of the most fuel efficient reduced-cylinder-count engine-operating-points.
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Paradigm shift in NVH

Automotive Engineering: June 2019

Lindsay Brooke
  • Magazine Article
  • 19AUTP06_02
Published 2019-06-01 by SAE International in United States

A new wave of vehicle technologies is changing the way Brüel & Kjaer attacks noise, vibration and harshness.

When you're in the business of NVH solutions, you get to know noise and vibration up close and personal. And for these experts, it can be difficult to sequester the ‘N and V’ throughout their own day. Ask Dr. Gabriella Cerrato, manager of global sound and vibration engineering services at Brüel & Kjaer.

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Vibration Rating Prediction Using Machine Learning in a Dynamic Skip Fire Engine

Tula Technology Inc-Aditya Mandal, Anastasios Arvanitis, S Kevin Chen, Li-Chun Chien, Vijay Srinivasan, Matthew Younkins
Published 2019-04-02 by SAE International in United States
Engines equipped with Dynamic Skip Fire (DSF) technology generate low frequency and high amplitude excitations that could reduce vehicles drive quality if not properly calibrated. The excitation frequency of each firing pattern depends on its length and on the rotational speed of the engine. Excitation amplitude mainly depends on the requested engine torque by the driver. During the calibration process, the torque characteristics that results in production level of noise, vibration, and harshness (NVH), must be identified, for each firing pattern and engine speed. This process is quite time consuming but necessary.To improve our process, a novel machine learning technique is utilized to accelerate the calibration effort. The idea is to automate the vibration rating procedure such that given the relevant power-train parameters, a vibration rating associated with that driving condition can be predicted. This process is divided into two (2) prediction models. The first model is a multiple additive regression trees that predicts the seat accelerometer data based on the various engine and vehicle parameters. The predicted seat accelerometer data is used as an…
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Novel Glass Laminates for Improved Acoustic Performance

Ford Motor Co Ltd-Chester Walawender, Sanjay Abhyankar
Vitro-Michael Ulizio, DeWitt Lampman
Published 2019-04-02 by SAE International in United States
Noise, Vibration, and Harshness (NVH) performance of vehicles is an all-encompassing study of hearing and feeling vibration as it relates to end user experience. The collection of glass in a vehicle can represent a large surface area, and can have a significant effect on NVH performance. Some of the most important glazing positions in relationship to the driver are the front doors, due to the proximity to the driver. Novel glass laminate constructions can provide acoustic improvement for these body positions over typically used standard glazings. The performance of these constructions will be discussed in terms of: acoustics, glass closing and door slam survivability, and solar performance.
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Target Setting for the Stiffness of Local Mounting Area in the Vehicle Body for NVH and R&H

SAE International Journal of Advances and Current Practices in Mobility

Hyundai Motor Company-Yongdae Kim, Ju Young Lee
  • Journal Article
  • 2019-01-1418
Published 2019-03-25 by SAE International in United States
Performance criterion of local stiffness in BIW(Body in White) for NVH(Noise, Vibration, and Harshness) and R&H (Ride and Handling) are presented in this study. A process to develop the local stiffness of the vehicle body has been established for the performances. For handling performance, not only suspension bush stiffness but local stiffness in BIW structure is important. However, there is no good standard to describe handling performance using BIW local stiffness. In this paper, a new evaluation standard for local stiffness in BIW is developed and verified considering actual vehicle driving condition for handling performance. Also, new evaluation process regarding local stiffness in BIW for vibration transmissibility is presented. The new process is developed considering optimal relation between connecting bush stiffness and BIW local stiffness. It is shown that the interior noise of the vehicle is reduced by applying the evaluation process, which is verified through several cases.
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WHAT WE'RE DRIVING

Automotive Engineering: March 2019

  • Magazine Article
  • 19AUTP03_09
Published 2019-03-01 by SAE International in United States

When the Tribeca, Subaru's first shot (2009) at a three-row SUV, didn't quite deliver the goods in this brutally competitive segment and went away in 2014, Fuji Heavy planners went right to work on the replacement-the all-new Ascent. It's more aesthetically pleasing, boasts a lighter and stiffer global architecture (long-wheelbase version of the latest Impreza sedan) and is better-designed and -equipped inside.

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2020 Explorer is the first product to emerge-more quietly-from Ford's newest NVH lab

Automotive Engineering: March 2019

Paul Seredynski
  • Magazine Article
  • 19AUTP03_11
Published 2019-03-01 by SAE International in United States

The 2020 Explorer is the first Ford product to be engineered via the automaker's new driving dynamics laboratory, which provides multiple tools to create quieter vehicles, including a new semi-anechoic, rolling-platform test chamber. The Explorer also features a first-for-Ford “dual-walled” bulkhead; in essence this a sealed composite engine shroud to further isolate the cabin from powertrain noise.

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Uncertainty Analysis of High-Frequency Noise in Battery Electric Vehicle Based on Interval Model

SAE International Journal of Vehicle Dynamics, Stability, and NVH

China Automotive Technology and Research Center Co., Ltd, China-Cansong Gu, Yaodong Hao
Jilin University, China-Junhong Dong, Fangwu Ma
  • Journal Article
  • 10-03-02-0006
Published 2019-02-01 by SAE International in United States
The high-frequency noise issue is one of the most significant noise, vibration, and harshness problems, particularly in battery electric vehicles (BEVs). The sound package treatment is one of the most important approaches toward solving this problem. Owing to the limitations imposed by manufacturing error, assembly error, and the operating conditions, there is often a big difference between the actual values and the design values of the sound package components. Therefore, the sound package parameters include greater uncertainties. In this article, an uncertainty analysis method for BEV interior noise was developed based on an interval model to investigate the effect of sound package uncertainty on the interior noise of a BEV. An interval perturbation method was formulated to compute the uncertainty of the BEV’s interior noise. The sound absorption coefficient and transmission loss of the sound package were obtained through tests, and a statistical energy analysis model of the BEV was established. The acoustic loads of the BEV were tested and the interior noise of the cabin was analyzed under certain working conditions. Uncertain parameters were…
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