Relevant bibliographies by topics / Noise-vibration-harshness (NVH)

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Academic literature on the topic 'Noise-vibration-harshness (NVH)'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "Noise-vibration-harshness (NVH)"

1

Qatu, M., M. Sirafi, and F. Johns. "Robustness of powertrain mount system for noise, vibration and harshness at idle." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 216, no. 10 (2002): 805–10. http://dx.doi.org/10.1177/095440700221600103.

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Noise, vibration and harshness (NVH) has become an increasingly important attribute in vehicle engineering. At idle conditions, customer-perceived NVH is dominated by powertrain NVH. Powertrain NVH can be radiated engine noise or noise (and vibration) transmitted through the powertrain mounting system. This paper discusses the variability in the latter NVH as a function of the variability of the mount stiffness parameters. A simple six-degree-of-freedom model is used in the analysis. A detailed design of experiment studies was conducted. It is concluded that better control of mount stiffness parameters would result in improved prediction and performance of idle NVH.
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2

Ab Aziz, Shamsul Akmar, Risby Mohd Sohaimi, Muhammad Hazwan Pu’ad, and Mohd Abdullah Mohd Yaman. "Noise, Vibration and Harshness (NVH) Study on Malaysian Armed Forces (MAF) Tactical Vehicle." Applied Mechanics and Materials 165 (April 2012): 165–69. http://dx.doi.org/10.4028/www.scientific.net/amm.165.165.

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Noise, Vibration and Harshness (NVH) is the study and modification of the noise and vibration characteristics of vehicles, particularly cars and trucks. NVH parameters which consist of noise (unwanted sound), vibration (mechanical oscillation) and harshness (severity or discomfort of noise or vibration) need to be evaluated in order to improve comfort and safety levels for vehicle occupants. In this paper, NVH study was conducted on Malaysian Armed Forces (MAF) tactical vehicles in order to ensure that the vehicles meet the requirements of the Occupational Safety and Health Administration (OSHA) and Directive 2002/44/EC. The project aim was to identify the preferable solution that can improve the NVH parameters of the vehicles in accordance to the standard and test protocols. A 4x4 Troop Transporter vehicle which carried 8 persons at the rear cabin was used in the NVH testing. The vibration parameters studied are hand arm vibration (HAV), focussing on vibration on the steering wheels of the vehicle, and whole body vibration (WBV), focussing on vibration on the seats. For noise, it was measured at the driver cabin and rear cabin of the vehicles. From the results, the HAV value for driver during idle speed was found to be higher than the others velocity. For WBV, vibration value for passenger 1 in rear cabin was highest compared to the other WBV test points.
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3

Hua, Xia, Alan Thomas, and Kurt Shultis. "Recent progress in battery electric vehicle noise, vibration, and harshness." Science Progress 104, no. 1 (2021): 003685042110052. http://dx.doi.org/10.1177/00368504211005224.

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As battery electric vehicle (BEV) market share grows so must our understanding of the noise, vibration, and harshness (NVH) phenomenon found inside the BEVs which makes this technological revolution possible. Similar to the conventional vehicle having encountered numerous NVH issues until today, BEV has to face many new and tough NVH issues. For example, conventional vehicles are powered by the internal combustion engine (ICE) which is the dominant noise source. The noises from other sources were generally masked by the combustion engine, thus the research focus was on the reduction of combustion engine while less attention was paid to noises from other sources. A BEV does not have ICE, automatic transmission, transfer case, fuel tank, air intake, or exhaust systems. In their place, there is more than enough space to accommodate the electric drive unit and battery pack. BEV is quieter without a combustion engine, however, the research on vehicle NVH is even more significant since the elimination of the combustion engine would expose many noise behaviors of BEV that were previously ignored but would now seem clearly audible and annoying. Researches have recently been conducted on the NVH of BEV mainly emphasis on the reduction of noise induced by powertrain, tire, wind and ancillary system and the improvement of sound quality. This review paper will focus on recent progress in BEV NVH research to advance the BEV systems in the future. It is a review for theoretical, computational, and experimental work conducted by both academia and industry in the past few years.
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4

Han, Gyu-Been, and Hyung-Seok Kook. "Intake Noise Simulation based on a Noise, Vibration and Harshness Simulator." Transactions of the Korean Society for Noise and Vibration Engineering 30, no. 3 (2020): 263–69. http://dx.doi.org/10.5050/ksnve.2020.30.3.263.

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5

Aziz, Shamsul Akmar Ab, Mohd Zaki Nuawi, Mohd Jailani Mohd Nor, and Dian Darina Indah Daruis. "Study of Noise, Vibration and Harshness (NVH) for Malaysian Army (MA) 3-Tonne Trucks." Applied Mechanics and Materials 471 (December 2013): 74–80. http://dx.doi.org/10.4028/www.scientific.net/amm.471.74.

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Moving vehicle will produce dynamic excitation and can be categorized in the study of noise, vibration and harshness (NVH). Studies of NVH can resolve issues associated with the use of a vehicle comfort. Exposure to some level of noise and vibration can be classified as a danger to vehicle passengers if they are exposed in a standard eight-hour time period. Therefore NVH aspect is the most important aspect in selecting a military vehicle other than the factor of safety, reliability, fuel consumption and maintenance costs. This study was carried out on Malaysian Army (MA) 3-tonne truck drivers who are exposed to noise and vibration produced by the truck. Vibration exposure at seat, steering wheel and body floor was measured using tri-axial and single axis accelerometers which were connected to a Brüel & Kjær Type 3649 vibration analyser, while noise exposure was measured at the drivers ear position using a DuO smart noise monitor. From the results obtained, both vibration and noise pressure levels increased proportionally with the increasing speed of the truck. In the long-term, will have an impact on the health of the truck drivers.
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6

Kumbhar, S., Subhasis Maji, and Bimlesh Kumar. "Automotive vibration and noise control using smart materials: a state of art and challenges." World Journal of Engineering 10, no. 6 (2013): 535–42. http://dx.doi.org/10.1260/1708-5284.10.6.535.

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In the past several years, there has been increased market place awareness of noise, vibration, and harshness performance in automobiles. The differentiation between the quality and reliability levels of automobiles has become less pronounced and, as a result, manufacturers have had to demonstrate superiority by focusing on NVH concerns. The automotive industry is currently spending millions of dollars on NVH work to develop new materials and damping techniques so that the damping treatments are lighter, cheaper, and more effective. Some of the methods used to control noise, vibration, and harshness includes the use of different carpeting treatments, the addition of rubber or asphalt material to car panels, gap sealant, and the injection of expandable foam into body panels. The aim of this study is to explore the feasibility of smart damping materials such as magnet orheological elastomers (MRE), piezoelectric materials, with its basic properties, for augmenting and improving the performance benefits of damping materials. This study also evaluates the noise and vibration benefits of smart damping materials as compared to conventional damping treatments.
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7

Kumbhar, S., Subhasis Maji, and Bimlesh Kumar. "Automotive vibration and noise control using smart materials: a state of art and challenges." World Journal of Engineering 11, no. 4 (2014): 413–20. http://dx.doi.org/10.1260/1708-5284.11.4.413.

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In the past several years, there has been increased market place awareness of noise, vibration, and harshness performance in automobiles. The differentiation between the quality and reliability levels of automobiles has become less pronounced and, as a result, manufacturers have had to demonstrate superiority by focusing on NVH concerns. The automotive industry is currently spending millions of dollars on NVH work to develop new materials and damping techniques so that the damping treatments are lighter, cheaper and more effective. Some of the methods used to control noise, vibration and harshness includes the use of different carpeting treatments, the addition of rubber or asphalt material to car panels, gap sealant, and the injection of expandable foam into body panels. The aim of this study is to explore the feasibility of smart damping materials such as magnetorheological elastomers (MRE), piezoelectric materials, with its basic properties, for augmenting and improving the performance benefits of damping materials. This study also evaluates the noise and vibration benefits of smart damping materials as compared to conventional damping treatments.
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8

Bang, Tae-Kyoung, Kyung-Hun Shin, Jeong-In Lee, Hoon-Ki Lee, Han-Wook Cho, and Jang-Young Choi. "Experimental and Comparative Study of Rotor Vibrations of Permanent Magnet Machines with Two Different Fractional Pole/Slot Combinations." Applied Sciences 10, no. 24 (2020): 8792. http://dx.doi.org/10.3390/app10248792.

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This study deals with the noise, vibration, and harshness (NVH) characteristic analysis of permanent magnet synchronous motors (PMSMs) for electrical machines, such as electrically driven tools that are used in industries. An improved NVH design is needed for application to industrial tools. In general, the electromagnetic NVH characteristics of PMSMs are classified into electromagnetic excitation sources, such as total harmonic distortion of EMF, torque pulsation, magnetic pull force, and unbalanced magnetic force (UMF). This study compares the vibration and noise generated by fractional pole/slot combinations. In PMSMs with fractional pole/slot combinations, UMF is an important NVH source. PMSMs generate UMF because of armature reaction fields based on the pole/slot combinations and harmonics of magnetic flux density. UMF was derived using the finite element method, and the rotor vibration analysis was performed using electromagnetic mechanical coupling analysis. The analysis results and the effect of electromagnetic excitation characteristics on the rotor vibration of the PMSMs were compared and analyzed.
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9

Hu, Qiao Sheng, Feng Ni, Shu Guang Zuo, Jian Ping Lin, De Guang Fang, and Fu Xiang Guo. "Investigation on Technology of Automobile Vibration and Noise Reduction Based on Body-In-White Structure." Key Engineering Materials 474-476 (April 2011): 676–80. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.676.

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The automotive body system is not only a source for directly radiating noise into the vehicle interior space, but also a key component for transmitting various vibrations and noise. The optimization of the modes for body-in-white has significant meanings for improving the reliability and NVH (Noise, Vibration and Harshness) performance of the whole vehicle. Based on the current situation that there is more severe interior vibration and noise problem occurring in driving for a light passenger vehicle, a hybrid modal analysis method combined with experiment and simulation methods is applied to investigate the vibration and noise characteristics of the whole vehicle body. By performing such modal analysis, the modal frequencies of the auto-body are improved effectively by strengthening the vibration sensitive regions in the body structure. The experiment for measuring interior vibration and noise levels under cruise condition is conducted to validate that the structural optimization for body-in-white has significant contribution for improving the whole vehicle NVH performance.
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10

Plättner, David. "E-Kompressoren entkoppeln." Lärmbekämpfung 16, no. 05 (2021): 154–55. http://dx.doi.org/10.37544/1863-4672-2021-05-24.

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Vibracoustic, ein weltweit führender Anbieter von NVH-Lösungen (Noise, Vibration and Harshness) für die Automobilindustrie, hat ein innovatives neues Entkopplungssystem für elektrische Kompressoren in modernen Elektrofahrzeugen und Plug-in-Hybrid- Fahrzeugen auf den Markt gebracht. Die neue Lösung adressiert viele der NVH-Herausforderungen, mit denen Fahrzeughersteller konfrontiert sind, wenn es darum geht, das Wärmemanagement der Batterien zu optimieren und gleichzeitig übermäßige Geräusche und Vibrationen von extrem beanspruchten E-Kompressoren auszugleichen.
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