Relevant bibliographies by topics / Ship noise and vibration

Academic literature on the topic 'Ship noise and vibration'

Author: Grafiati
Published: 11 March 2023

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Journal articles on the topic "Ship noise and vibration"

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Ojak, W. "Vibrations and Waterborne Noise on Fishery Vessels." Journal of Ship Research 32, no. 02 (June 1, 1988): 112–33. http://dx.doi.org/10.5957/jsr.1988.32.2.112.

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The Food and Agricultural Organization of the United Nations granted a fellowship to the author to study, at several European ship research institutes, the problem of noise generation and propagation on fishery vessels. He later took part in the design of the fishery research vessel Prof. Siedlecki, which included the implementation of a series of antivibration and antinoise precautions. This paper compares vibration and noise levels on two fishery research vessels—the conventional RV G.O.Sars and RV Prof. Siedlecki. The paper is divided into two parts. In the first part, mechanical vibrations of the elastically supported propeller are dealt with and conditions for minimum vibration response are determined. In the second part, structural vibrations in the ships and noise propagation from the ships to the water are described. The paper concludes with data on structural vibrations and waterborne noise propagation. This paper, and the paper published in the June 1984 issue of JOURNAL OF SHIP RESEARCH [1],2 completes the author's approach to propeller vibrations.
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Zou, Chun-Ping, Duan-Shi Chen, and Hong-Xing Hua. "Investigation of Ship Structural Vibration and Underwater Radiation Noise." Journal of Ship Research 47, no. 04 (December 1, 2003): 275–89. http://dx.doi.org/10.5957/jsr.2003.47.4.275.

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Underwater radiation noise is a very important factor for most ships, such as fishing boats, warships, and so forth. The magnitude of its energy depends on the vibration of the hull in contact with water. The vibration of the hull caused by the power plant, while the vessel is cruising, is the dominant source of underwater radiation noise, which is the subject of our investigation. In this paper, the coupled finite element/boundary element method is used to investigate ship structural vibration and underwater radiation noise. The finite element method (FEM) is employed to analyze modes and vibration responses of an entire ship for different kinds of excitations in consideration of fluid-structure interaction. The boundary element method (BEM) is used to analyze the underwater radiation noise. A FEM model is first constructed by using 30 geometric parameters and five kinds of finite elements. Then, the reduced matrix method is used to eliminate the local modes in order to obtain the overall bending and torsional modes of the ship. Last, vibration displacements of the hull are treated as the velocity boundary condition of BEM to calculate underwater radiation noise. Numerical results show thatthe calculated sound-pressure levels of underwater radiation noise are in a good agreement with experimentally measured results;although the vibration isolator is used, the propulsion diesel engine is the dominant source of the underwater radiation noise among all machines in the engine room and the maximum sound-pressure levels increase as the sailing speed of the ship increases;the underwater radiation noise of the ship with gearbox excitation is greater than that of the ship with diesel generator set excitation, which should be noticed by the ship designers during the design stage.
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Liu, Hongmin, Xincheng Lin, Zhihao Gong, and Jieyuan Shi. "Combined Annoyance Assessment of Ship Structural Vibration and Ambient Noise." Buildings 13, no. 2 (January 28, 2023): 363. http://dx.doi.org/10.3390/buildings13020363.

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Background: Noise and vibration are environmental pollutants that endanger people’s productivity and sleep quality in ships, but the coupled effect in ship cabins has not been studied. This study aimed to assess the coupled effect of noise and vibration in ship cabins and propose a comfortable range of noise and vibration. Methods: Three different accommodation cabins were chosen to measure noise and vibration levels and investigate their satisfaction. A revised model combining exponential membership functions was proposed to reveal the relationship between noise and vibration level and its response. The annoyance rate from greater to lesser was classified as A, B, C, D, and E. Results: All measurement levels were satisfied with the acceptance ranges of standards. While subjects felt high annoyance in the crew lounge, subjects in passenger and dining cabins felt slightly annoyed. Conclusions: By combining measurements and subjective investigations, the prediction performance of the revised annoyance model was verified. The noise level reached 57.5 dB(A), and the acoustic condition had a greater impact on subjective feelings than the vibration level. For grade E demands, the vibration level should be lower than 0.095 m/s2, and the noise level should be less than 54 dB(A).
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Fang, Yuan Yuan, Guo Hong Zhang, Ya Fan Li, and Peng Zhe Qi. "Design of Vibration Isolation Device for Ship Power Equipment and Investigation on its Dynamic Properties." Applied Mechanics and Materials 496-500 (January 2014): 1129–33. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.1129.

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Mechanical noise caused by power equipment vibration is the main source of underwater radiated noise of the ship, and vibration isolation and noise reduction of ship equipment has been widely concerned. Therefore,a vibration isolation system designed for four sets of auxiliary engine of ship cabin was investigated in the paper, aimed to further reveal the influence of various parameters including floating raft shell thickness, excitation source, and different ship hull and installation platform thickness on the vibration level difference of system. The results obtained from numerical analysis using MSC software and experiment indicate that one-dimensional spring element simplified can properly simulate the actual rubber vibration isolator on low frequency bands, and increasing thickness of flat, hull and platform can improve the effect of vibration isolation obviously.
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Pavan Kumar, GVV, V. V. S. Prasad, and B. H. Nagesh. "Measurement of small vessel machinery vibration induced acoustic signature levels." Journal of Naval Architecture and Marine Engineering 16, no. 2 (December 26, 2019): 87–98. http://dx.doi.org/10.3329/jname.v16i2.42030.

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Ship vibrations, airborne and underwater noise levels have always been a challenging topic from a performance point of view in ship design, building and operation. The measurement shall help in monitoring the self-noise and the technical state of their machinery mechanism. The vibration levels on the main engine and auxiliary Genset foundation, airborne noise levels of the engine room and underwater self-noise levels of a small mechanized fishing trawler was measured at the jetty in idling condition. The vibration levels on the foundation measured the average value of 0.207 mm/s for the main engine and 1.36 mm/s for auxiliary Genset. The airborne noise levels measured 99 dB (A) in the engine room. The peak underwater sound pressure levels measured 162 dB re 1µPa. The response spectra indicate the peak vibration and noise levels in the lower frequency region <1.2 kHz. The machinery excitation forces transferred to the hull surface as pressure fluctuations which generated the airborne and underwater noise levels. Though the measurement limited to jetty conditions, detailed analysis can be useful for detection, classification, and tracking of small vessels.
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Vracar, Miodrag, and Nenad Kovacevic. "Vibration of the vessel and bispectrum of hydroacoustic noise." Facta universitatis - series: Physics, Chemistry and Technology 7, no. 1 (2009): 45–60. http://dx.doi.org/10.2298/fupct0901045v.

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The origin of vessels vibrations is dominantly determined by vessels propulsion system, auxiliary systems, pumps, breaking of the waves at the ship hull, etc. All of these systems contribute to the appearance of the underwater sound in water environment. As a source of underwater sound, vessels has the characteristic of directivity. Vibration of the vessel's structure is analyzed using spectra, but hydroacoustic signals are analyzed using spectra and higher order spectral analysis - bispectra. The measuring of the radiated hydroacoustic noise was done simultaneously with multi channel measurements of the vessels vibrations at few characteristics positions of the vessel.
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Kozaczka, Eugeniusz, Jacek Domagalski, and Ignacy Gloza. "Investigation of the underwater noise produced by ships by means of intensity method." Polish Maritime Research 17, no. 3 (January 1, 2010): 26–36. http://dx.doi.org/10.2478/v10012-010-0025-0.

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Investigation of the underwater noise produced by ships by means of intensity method This paper presents results of research on spectral structure of underwater noise acoustic field radiated into water by selected ships moving in shallow waters. Underwater acoustic field of ships in motion is associated with acoustic activity of ship mechanisms and equipment under work. Vibration energy radiated by the mechanisms and devices is transmitted by ship structural elements to surrounding water where it is propagated in the form of acoustic waves of a wide frequency band. In this paper are presented results of the research on propagation of energy of acoustic waves in the near fiel, obtained from acoustic pressure measurements by means of two sensors located close to each other.
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Zhou, Zhenwei, and Jiaming Wu. "Low to Middle Vibro-Acoustic Noise Prediction in Ship Cabin by Using Plate-Cavity Coupling Model." Polish Maritime Research 25, s2 (August 1, 2018): 149–57. http://dx.doi.org/10.2478/pomr-2018-0086.

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Abstract A plate-cavity coupling method based on modal expansion technique in the closed sound cavity was introduced, aiming at ship cabin structural noise. Using this method, a coupled equation was established. The structural vibration acceleration of the target cabin was extracted from a ship vibration response calculation, applied to the model. Then the target cabin noise value was obtained through numerical calculation. The effectiveness and reliability of the method were validated through experiments. The coupled model predicts noise in the cabin does not require fluid finite element model of the cabin air, thus greatly reducing the calculation time compared with the pure finite element method. It was shown that the method is suitable for the calculation of noise in a single ship cabin; the method has a high calculation efficiency. Furthermore, the calculated result is a continuum. On the one hand, it can be conveniently converted to an octave or 1/3 octave according to the specification. On the other hand, the form of the continuum also provides a corresponding response to the subsequent vibration and noise control.
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Layuk, Semuel, Tri Martiana, Getruida Banon H. Alow, Dismo Katiandagho, Cherlis Pomalango, Raden Khariyatul Afiyah, and Siti Nur Hasina. "Physical environment and work fatigue among ship engine room crew." International journal of health sciences 6, no. 3 (October 5, 2022): 1556–64. http://dx.doi.org/10.53730/ijhs.v6n3.13248.

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The physical environment of a ship is often found to be below the government’s standard, which affects employees’ health and causes work fatigue. The present study aimed to identify the physical environment and work fatigue in the ship engine room at Manado Port by applying a cross-sectional analytical approach. The study population was forty-one engine room crew of seven ships with Manado-Talaud Archipelago routes with 7-16 hours trip. The research instrument includes a hygrometer, sound level meter, vibration meter, and work fatigue questionnaire (KAUP2). The data were analyzed descriptively and by performing a correlation test. The study found that the ships’ temperature, noise, and vibration exceeded the stipulated threshold limit value. The relationship between the physical environment and work fatigue was also noticed.
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Olunloyo, Vincent O. S., and Charles A. Osheku. "On Vibration and Noise Dissipation in Ship and FPSO Structures with Smart Systems." ISRN Mechanical Engineering 2012 (August 7, 2012): 1–19. http://dx.doi.org/10.5402/2012/127238.

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Ships and floating structure production systems are widely deployed for deep and ultradeep waters operation. Active vibration reduction and noise control in such structures can significantly improve their hydrodynamic performance and stability during navigation, exploration, and exploitation activities. One way to minimise or reduce the transmission of vibration in these moving offshore structures is to exploit the mechanism of interfacial slip in press fit joints or layered structural laminates in their internal hull configurations to dissipate vibration energy. In this paper, slip damping with heterogeneous sandwich composite viscoelastic beam-plate smart systems as a model for dissipation of vibration and active noise control mechanism in ship and floating structures is investigated. For this problem, a boundary value partial differential equation is formulated for the case of linear and nonlinear hydrodynamic wave loadings. In particular, the effect of pressure distribution variation at the interface of the layered smart system on the energy dissipation, logarithmic damping decrement, and spatial transfer function is analyzed and presented for design application and selection of appropriate stabilizers.
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Dissertations / Theses on the topic "Ship noise and vibration"

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Wang, Wei-Hui. "Modelling machine induced noise and vibration in a ship structure." Thesis, University of Plymouth, 2000. http://hdl.handle.net/10026.1/2823.

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Most high speed vessels are fitted with powerful high speed engines which are installed in confined spacesa nd, as a consequencec, ausea n extremely high level of noise and vibration. Often structure-borne sound power is transmitted to a sound carrying structure from a source via a number of contact points. In turn, the noise and vibration are propagated in the structure and could possibly cause an undesired noise radiation. In this study, a model for predicting power flow based on the mobility theory has been addressed. The unique parts of the study include the establishment of the relationship of mobility functions with respect to four-pole parameters and the dynamic stiffness coefficients of a coupled machine/mount/foundation system. Also expressions to represent the sound input power, the output power and the transmitted power in relation to mobility functions are clarified. From a detailed analysis of relevant literature, it is shown that no validated models for predicting the propagation of structure-bome noise within the intermediate frequency range of 125 Hz to lkHz exist. As a consequence, a new numerical stress wave model has been developed to bridge this knowledge gap. This innovative approach extends the earlier works of Cremer, Heckl and Ungar in the field of stress wave propagation. Finally, a novel holistic model has been developed to line up the transmission, propagation and radiation predictions of a machine induced noise and vibration in ship's structure to take in account the fluid-structure interaction effect. A number of experiment measurements have been performed to validate the established models. From the comparisons, the prediction models are shown to be credible with an accuracy higher than 95 per cent. The established models are of a generic nature and can be applicable to diverse engineering fields regarding to the predictions of structure-borne noise and vibration transmission, propagation and radiation. Applications of these models to characterize the vibration reduction countermeasures,a s in the case of resilient mounts and squeeze-film damping plates, from a machine are also discussed.
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Raggio, Quintas Juan Pablo. "Metodologia para avaliação de ruído e vibração no corpo humano em navios de transporte de cargas perigosas." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/17888.

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Este trabalho apresenta a medição e avaliação dos níveis de ruído e vibração que a tripulação de um navio, que transporta cargas perigosas na bacia do sul, está submetida e propor soluções para diminuir essa exposição. Levando em conta que a tripulação está exposta durante toda a viagem do navio a redução dos níveis de ruído e vibração é de suma importância para melhorar o conforto e a prevenção de moléstias e ou doenças decorrentes dessa exposição. Foram realizadas medições do nível de pressão sonora e aceleração nas três direções em camarotes e na praça de máquinas do navio em estudo. Foram comparadas com normas que regem os níveis de ruído e vibração adequados para embarcações marítimas. Através da análise do espectro de frequência e do espectro cruzado das medições realizadas foram definidos caminhos de propagação das ondas sonoras e vibratórias e identificadas as frequências que são transmitidas por eles. De posse desses dados são apresentadas propostas de soluções para a diminuição dos níveis de pressão sonora e vibração no navio.
This work presents the measurement and assessment a ships crew exposition to noise and vibration. The ship hauls hazardous cargo in the brazilian southern basin. Considering that the crew is exposed throughout the ship's journey reducing the levels of noise and vibration is critical for improved comfort and prevention of exposure aggravated diseases. Sound pressure levels and three dimensional acceleration measurements were performed on the studied vessel's cabins and engine room. The levels of noise and vibration were compared with standards suitable for marine vessels. Propagation paths of sound waves and vibration were defined by analyzing the frequency spectrum and cross spectrum of the measurements as well as their transmitted frequencies. Proposals for based on the data gathered of sound pressure level and vibration reduction are presented.
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Moro, Lorenzo. "Structure borne noise due to marine diesel engines: experimental study and numerical simulation for the prediction of the dynamic behaviour of resilient mounts." Doctoral thesis, Università degli studi di Trieste, 2015. http://hdl.handle.net/10077/11114.

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2013/2014
Gli alti livelli di comfort che sono richiesti oggigiorno a bordo di navi da crociera e mega-yachts, portano i progettisti a concentrare la loro attenzione sul problema del rumore strutturale. I motori diesel quattro tempi che sono installati a bordo nave come motori principali o diesel generatori, sono tra le principali sorgenti di rumore strutturale. Per questa ragione, al fine di ridurre l’energia vibrazionale generata da queste sorgenti e trasmessa, tramite le strutture nave, ai locali alloggio, i motori diesel sono sospesi mediante elementi resilienti. Tali elementi resilienti disaccoppiano la sorgente di rumore e vibrazioni (motore diesel) dal mezzo di propagazione (le strutture nave) e isolano dunque la sorgente dalle strutture riceventi. I livelli di rumore strutturale misurati alle fondazioni del motore diesel dipendono dai livelli di velocità misurati sulla sorgente (cioè ai piedi del motore diesel), dai livelli di impedenza meccanica degli elementi resilienti e dai livelli di mobilità meccanica delle fondazioni del motore diesel. Il single-point approach è un approccio semplificato per la previsione dei livelli di rumore strutturale che trascura l’interazione tra elementi resilienti. Secondo tale teoria, al fine di ridurre il rumore strutturale trasmesso attraverso gli elementi resilienti alle strutture nave, si deve ridurre l’impedenza meccanica degli elementi resilienti così come la mobilità meccanica delle fondazioni del motore diesel. In altre parole, si devono aumentare la rigidezza dinamica degli elementi resilienti così come l’impedenza meccanica delle fondazioni del motore diesel. Ad oggi, l’impedenza meccanica degli elementi resilienti può essere ricavata solo mediante prove sperimentali in laboratorio, mentre la mobilità meccanica del motore diesel è solitamente misurata quando la nave è in costruzione. Dunque non vi è la possibilità di predire, in fase progettuale, il rumore strutturale dovuto ai motori diesel. In questa tesi, viene presentata una procedura per la simulazione del rumore strutturale dovuto a motori diesel marini. La procedura si basa su test sperimentali e simulazioni numeriche. Nella prima parte della tesi sono richiamate le basi teoriche necessarie per l’esecuzione delle procedure numeriche e delle prove sperimentali. Sono dunque presentati i risultati delle analisi numeriche per simulare la mobilità delle fondazioni dei motori diesel marini. I risultati delle analisi FEM sono stati validati mediante confronto dei risultati delle analisi numeriche con i dati ottenuti da una campagna di misure eseguite a bordo nave. Successivamente sono presentati i risultati di una serie di prove eseguite per collaudare una nuova macchina sperimentale per misurare l’impedenza meccanica degli elementi resilienti. Lo scopo del collaudo era definire una procedura per l’utilizzo della macchina e per l’esecuzione di prove sperimentali in accordo alla ISO 10846, che è considerata normativa di riferimento per questo tipo di prove. Si è dunque proceduto con l’esecuzione di prove sperimentali eseguite su un elemento resiliente per motori diesel marini. Le prove sono state eseguite a differenti carichi statici. I risultati di queste prove sperimentali sono stati utilizzati per settare un modello numerico che simuli il comportamento non-lineare del componente in gomma del resiliente. I risultati ottenuti sia dalle prove sperimentali sia dalle simulazioni numeriche sono stati utilizzati per predire il rumore strutturale generato dai motori diesel, in accordo al single-point approach. I risultati ottenuti dall’applicazione del metodo sono stati confrontati con misure eseguite a bordo e sono stati discussi per evidenziare vantaggi e svantaggi dell’applicazione del metodo. Le procedure numeriche per la simulazione del comportamento dinamico del resiliente e della fondazione costituiscono un primo passo per l’ottimizzazione del sistema di isolazione del motore diesel marino.
The high level of comfort that is required today on board cruise vessels and mega-yachts, leads the designers to focus their attention on structure-borne noise issues. Four-stroke diesel engines that are installed on board as main diesel engines for the propulsion system and as gen-sets, are usually the main sources of structure-borne noise. For this reason, the diesel engines are usually resiliently mounted in order to reduce the vibration energy generated by these sources and transmitted through the ship structures to the accommodation areas. These mounts decouple the noise and vibration source (diesel engine) from the means of wave propagation (ship structures) and so, they isolate the source from the receiving structures. The structure-borne noise levels measured at the diesel engine foundation depend on the velocity levels measured at the source (diesel engine feet), on the mechanical impedance levels of the resilient mounts and on the mechanical mobility levels of the diesel engine foundation. The simplified theory of the single-point approach neglects the interaction among the resilient mounts. According to this theory, to decrease the structure-borne noise transmitted through the resilient mounts towards the ship structures, the mechanical impedance of the resilient mounts as well as the mechanical mobility of the diesel engine foundation are to be lowered. In other words the dynamic stiffness of the resilient mounts has to be decreased and the mechanical impedance of the diesel engine foundation has to be increased. To date, the mechanical impedance of real resilient mounts can only be obtained by laboratory tests and the mechanical mobility of the diesel engine foundation is usually measured when the ship is under construction, so it is not available for predictive analyses. In the thesis, a procedure for simulating the structure-borne noise generated by marine diesel engine is discussed. The procedure is based on both experimental tests and numerical simulations. In the first part of the thesis, some notes on the theoretical background are presented. Then, the results of FE analyses for simulating the mechanical mobility of a diesel engine foundation are shown. The FE models have been validated by the results of a measurement campaign carried out on board a ship. Then, the results of a series of tests performed to tune a new test rig, designed and built up at the University of Trieste for measuring the mechanical impedance of resilient mounts, are discussed. The campaign for tuning the test rig has been carried out in order to set an experimental procedure that allows achieving results in compliance with the ISO 10846 Standard, which is a sound reference for this kind of tests. As a case study, a large resilient mount for marine diesel engines has been tested to achieve its mechanical impedance curve at different static pre-loads. The outcomes of the experimental tests have been used for tuning the best numerical model of the resilient mount that properly takes into account the nonlinear behaviour of the rubber core. The data of the experimental tests carried out on board ships as well as in laboratory and the outcomes of numerical simulations have been used to predict the structure-borne noise according to the single-point approach. The outcomes achieved by the application of the method have been compared with on board measurements and pros and cons of the method are widely discussed. Moreover, the numerical procedures for the simulation of the dynamic behaviour of the resilient mount and the diesel engine foundation, pave the way for the optimization of the decoupling system of marine diesel engines.
XXVII Ciclo
1982
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Velonias, Platon Michael. "Vibration analysis of a SWATH-type ship." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/38129.

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Graham, William Richard. "Boundary-layer noise and vibration." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308331.

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Körning, Ljungberg Jessica. "Psychological responses to noise and vibration." Doctoral thesis, Umeå universitet, Folkhälsa och klinisk medicin, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-915.

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Vehicle drivers are a group of workers that are exposed to noise and whole-body vibration (WBV) several hours a day. Some drivers may also be exposed to high mental loads – monitoring and manipulating physical controls while engaging problem solving activities often with strong short-term memory and spatial manipulation components. Present standards and regulations that govern health risk assessment do not take into consideration the complexities of these multiple exposure environments. The effect of one factor (for example, noise or WBV) may be different than the effect of two factors presented together. This thesis investigates whether the combination of noise and WBV affects the performance of cognitive tasks more than when the exposures are presented separately. A series of studies were designed to expose subjects to noise and WBV stimuli designed to simulate real life working conditions. Different combinations of subjective ratings, cognitive tests, and cortisol measurements were conducted both during and immediately after exposures, which ranged from 20 to 45 minutes. The studies have shown that a combination of noise and WBV do not degrade cognitive performance more than a single stimulus. However, WBV can degrade attention performance after exposure is turned off when drivers have been working under high mental load during exposure. The combined stimuli are also experienced as more annoying and work is more difficult in such conditions. The exposure times and task difficulty levels used in this thesis did not produce biological stress as measured by cortisol. Nevertheless, subjective ratings are sometimes seen as early indicators of other symptoms and with increased task difficulty and/or longer exposure times there may appear other measurable outcomes of the combined stimuli.
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Körning, Ljungberg Jessica. "Psychological responses to noise and vibration /." Umeå : Umeå universitet : Arbetslivsinstitutet, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-915.

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Tratch, Jorge. "Vibration transmission through machinery foundation and ship bottom structure." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/15216.

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Thesis (Mech.E)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1985.
MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.
Includes bibliographical references.
by Jorge Tratch Junior.
Mech.E
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Huang, Yuan. "Human response to combined noise and vibration." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/348814/.

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The discomfort caused by the noise and vibration in cars is investigated in this thesis to improve understanding of how subjective judgements of noise and vibration affect each other, how the relative discomfort of noise and vibration depend on their magnitudes and their durations, and how the total discomfort caused by simultaneous noise and vibration can be predicted. Two experiments were designed to determine the magnitude-dependence of the relative discomfort caused by noise and vertical whole-body vibration. Subjects were presented with various combinations of different levels of noise and different magnitudes of vibration, and rated the discomfort caused by noise relative to the discomfort caused by vibration, and also vibration discomfort relative to noise discomfort. The subjective equivalence between noise and vibration was highly dependent on whether noise was judged relative to the vibration or vibration was judged relative to the noise. When judging noise, higher magnitude vibrations appeared to mask the discomfort caused by low levels of noise. When judging vibration, higher level noises appeared to mask the discomfort caused by low magnitudes of vibration. The duration-dependence of the relative discomfort of noise and vibration was then investigated. Subjects were presented with 49 combinations of seven levels of noise and seven magnitudes of vertical whole-body vibration, and with five durations (2, 4, 8, 16, and 32 s). Either the discomfort caused by noise relative to the discomfort caused by vibration, or vibration discomfort relative to noise discomfort were rated in two sessions. The findings indicate that noise discomfort and vibration discomfort have a similar dependence on duration. The slopes expressing the levels of noise (sound pressure level or sound exposure level) judged equivalent to the levels of vibration (logarithms of the r.m.s. acceleration or vibration dose value) increased with increasing duration when judging noise relative to vibration, but were independent of duration when judging vibration relative to noise. As the durations increased from 2 to 32 s, the masking effect of vibration on noise discomfort decreased, whereas the masking effect of noise on vibration discomfort did not change. Finally the noise discomfort in the presence of vibration, vibration discomfort in the presence noise, and the combined discomfort of simultaneous noise and vibration were investigated by employing the method of absolute magnitude estimation. Subjects judged noise discomfort, vibration discomfort, and their total discomfort in different sessions. The results suggest that, within the range of stimuli magnitudes investigated, the discomfort caused by vibration was reduced by noise whereas the judgement of noise discomfort was not significantly influenced by vibration. The total discomfort caused by simultaneous noise and vibration was well predicted by ψc = [(ψv)2+ (ψs)2]0.5, where ψv, ψs, and ψc, represent vibration discomfort, noise discomfort, and their total discomfort, respectively. In conclusion, the relative discomfort caused by noise and vibration varies according to whether subjects are asked to judge noise discomfort relative to vibration discomfort or vibration discomfort relative to noise discomfort. There are masking effects of noise on the judgement of vibration discomfort, and of vibration on the judgement of noise discomfort, depending on the relative magnitudes of the two stimuli. The influence of vibration on the judgement of noise discomfort decreases with increasing duration of the stimuli, whereas the influence of noise on the judgement of vibration discomfort is independent of the duration. The discomfort caused by a combination of noise and vibration can be predicted by root-sums-of-squares of the discomfort caused by noise and the discomfort caused by vibration when these stimuli are presented alone.
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Lin, Tian Ran. "Vibration of finite coupled structures, with applications to ship structures." University of Western Australia. School of Mechanical Engineering, 2006. http://theses.library.uwa.edu.au/adt-WU2006.0093.

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[Truncated abstract] Shipbuilding is fast becoming a priority industry in Australia. With increasing demands to build fast vessels of lighter weight, shipbuilders are more concerned with noise and vibration problems in ships than ever. The objective of this thesis is to study the vibration response of coupled structures, in the hope that the study may shed some light in understanding the general features of ship vibration. An important feature characterizing the vibration in complex structures is the input mobility, as it describes the capacity of structures in accepting vibration energy from sources. The input mobilities of finite ribbed plate and plate/plate coupled structures are investigated analytically and experimentally in this study. It is shown that the input mobility of a finite ribbed plate is bounded by the input mobilities of the uncoupled plate and beam(s) that form the ribbed plate and is dependent upon the distance between the source location and the stiffened beam(s). Off-neutral axis loading on the beam (point force applied on the beam but away from the beam’s neutral axis) affects the input power, kinetic energy distribution in the component plates of the ribbed plate and energy flow into the plates from the beam under direct excitation ... solutions were then used to examine the validity of statistical energy analysis (SEA) in the prediction of vibration response of an L-shaped plate due to deterministic force excitations. It was found that SEA can be utilized to predict the frequency averaged vibration response and energy flow of L-shaped plates under deterministic force (moment) excitations providing that the source location is more than a quarter of wavelength away from the plate edges. Furthermore, a simple experimental method was developed in this study to evaluate the frequency dependent stiffness and damping of rubber mounts by impact test. Finally, analytical methods developed in this study were applied in the prediction of vibration response of a ship structure. It was found that input mobilities of ship hull structures due to machinery excitations are governed by the stiffness of the supporting structure to which the engine is mounted. Their frequency averaged values can be estimated from those of the mounting structure of finite or infinite extents. It was also shown that wave propagation in ship hull structures at low frequencies could be attenuated by irregularities imposed to the periodic locations of the ship frames. The vibration at higher frequencies could be controlled by modifications of the supporting structure.
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Books on the topic "Ship noise and vibration"

1

Loeser, Harrison. Fundamentals of ship acoustics: Acoustical phenomena in and around ship hulls. Jersey City: Society of Naval Architects and Marine Engineers, 1999.

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Nikiforov, A. S. Akusticheskoe proektirovanie sudovykh konstrukt͡s︡iĭ: Spravochnik. Leningrad: "Sudostroenie", 1990.

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A, Kleshchev A., ed. Sudovai͡a︡ akustika: Sbornik nauchnykh trudov. Leningrad: Leningradskiĭ korablestroitelʹnyĭ in-t, 1989.

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Marine, Technology Symposium (5th 1988 Espoo Finland). The 5th Marine Technology Symposium: Noise & vibration, winter navigation, hydrodynamics : Espoo, January 11-12, 1988. Espoo: The Centre, 1988.

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Yao, Xiongliang. Jian chuan jie gou zhen dong chong ji yu zao sheng. Beijing: Guo fang gong ye chu ban she, 2007.

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International, Congress on Noise Control Engineering (1999 Fort Lauderdale Fla ). Proceedings of inter-noise 99: The 1999 International Congress on Noise Control Engineering. Washington, DC: Institute of Noise Control Engineering, 1999.

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Brandt, Anders. Noise and Vibration Analysis. Chichester, UK: John Wiley & Sons, Ltd, 2011. http://dx.doi.org/10.1002/9780470978160.

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Gastmeier, William. Ataratiri noise and vibration. Mississauga, Ont: Vibron, 1990.

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Gear noise and vibration. 2nd ed. New York: Marcel Dekker, 2003.

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Royster, Larry H., and Julia Doswell Royster, eds. Noise Vibration Problem-Solution Workbook. 2700 Prosperity Ave., Suite 250 Fairfax, VA 22031: American Industrial Hygiene Association, 2002. http://dx.doi.org/10.3320/978-1-931504-14-0.

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Book chapters on the topic "Ship noise and vibration"

1

Yang, Deqing. "Ship Vibration and Noise Reduction with Metamaterial Structures." In Lecture Notes in Civil Engineering, 377–86. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4672-3_24.

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Pang, Fu-Zhen. "Ice-Induced Vibration and Noise of Ships." In Encyclopedia of Ocean Engineering, 796–803. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-10-6946-8_109.

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Pang, Fu-Zhen. "Ice-Induced Vibration and Noise of Ships." In Encyclopedia of Ocean Engineering, 1–8. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-10-6963-5_109-1.

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Morrow, R. T., and A. J. Fraser. "Radiation of Waterborne Noise Due to Ships Machinery Part I: Airborne Transmission." In Industrial Vibration Modelling, 91–107. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-4480-0_6.

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Riola, J. M., J. C. Díaz-Cuadra, and Publio Beltrán. "Noise and Vibration Control Program for Warship: The New Spanish Frigate F110." In Proceeding of the VI International Ship Design & Naval Engineering Congress (CIDIN) and XXVI Pan-American Congress of Naval Engineering, Maritime Transportation and Port Engineering (COPINAVAL), 163–74. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-35963-8_14.

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Yan, Xiujun, Zhonghua Li, and Lin Chen. "Prototype Monitoring of Cavitation in Valve Culvert of Qianwei Shiplock." In Lecture Notes in Civil Engineering, 553–64. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6138-0_48.

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AbstractThe working condition of water valve is an important sign of the success for navigation lock design, and the valve cavitation characteristics and suppression technology is the key technical challenge in the design of high head navigation lock, in the view of the “flat bottom & top spreading” with the condition of “less project quantities, convenient construction” simple type corridor with the head of 19 m in Qianwei ship lock, the method of combining the physical model test and prototype observation are both adopt to this research. Through the physical model test, the cavitation position, cavitation characteristics and the effect of natural ventilation on cavitation suppression are comprehensively determined by analyzing the change law of cavitation noise intensity from several cavitation noise sensors under different opening conditions during the opening process, also the visual observation of flow state and auditory observation. Prototype observation focuses on the effect of self-aerated technology of valve lintel. When the air pipe outside the value lintel position is closed, there are evident in the cavitation pulse signal, and the maximum strength can reach to 182Pa, the “crackling” of cavitation collapse could be clearly felt at the top of the value, occasionally with 2–3 times slight “muffled thunder”, The results show that the valve section has stronger cavitation during the opening process of value. On the contrary, when self-aerated of valve lintel was realized, the maximum ventilatory capacity was 0.169 m3/s, which was close to the 0.170 m3/s calculated by the physical model in the design stage, and no cavitation pulse signal was detected among the valve wells on both sides, and the process line was “stable” with the maximum noise intensity only about 10 Pa, no sound of cavitation collapse was heard at the top of the valve section during the whole valve opening process. The comparison of value steeve vibration also verifies the effect of self-aerated technology of valve lintel at the same times. The results show that self-aerated technology of valve lintel can significantly inhibit the cavitation of valve segment of this form.
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Okumoto, Yasuhisa, Yu Takeda, Masaki Mano, and Tetsuo Okada. "Vibration Prevention." In Design of Ship Hull Structures, 527–57. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-88445-3_30.

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Foreman, John E. K. "Vibration and Vibration Control." In Sound Analysis and Noise Control, 164–90. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-6677-5_6.

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André, Michel. "Noise and Vibration." In Energy and Environment, 435–38. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119307761.part6.

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Morello, Lorenzo, Lorenzo Rosti Rossini, Giuseppe Pia, and Andrea Tonoli. "Noise, Vibration, Harshness." In Mechanical Engineering Series, 239–363. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0516-6_5.

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Conference papers on the topic "Ship noise and vibration"

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Andersen, K. "Underwater Noise from Ship Hulls." In International Conference on Noise & Vibration in the Marine Environment. RINA, 1995. http://dx.doi.org/10.3940/rina.nv.1995.17.

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Collins, D. G., P. A. Fitzsimmons, and S. F. Wong. "Ship Vibration - The Methodology and Practice of Vibration Control." In International Conference on Noise & Vibration in the Marine Environment. RINA, 1995. http://dx.doi.org/10.3940/rina.nv.1995.1.

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Lu, Leo, William Hawkins, and Richard G. DeJong. "A New Tool for Ship-Marine Machinery Noise Analysis." In SAE 2009 Noise and Vibration Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2009. http://dx.doi.org/10.4271/2009-01-2195.

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Cintosun, Esen, and Layton Gilroy. "Estimating Ship Underwater Radiated Noise from Onboard Vibrations." In SNAME Maritime Convention. SNAME, 2021. http://dx.doi.org/10.5957/smc-2021-114.

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The acoustic signature of an Orca-class training vessel (Patrol Craft Training, PCT) Moose from the Royal Canadian Navy (RCN) was measured at the RCN’s Patricia Bay acoustic range on Vancouver Island, British Columbia, Canada. The acoustic range trials included accelerometer measurements on the ship hull and in the engine room and hydrophone measurements at approximately 100 m from the ship. The trials were carried out at the ship speed range of 3 to 20 knots. The test data from all the trial runs was used to derive, evaluate and validate the method of estimating ship underwater radiated noise from onboard vibrations. In the investigation, the runs were split into two sets: a training set and a testing set. A least squares approximation, AQV (average quadratic velocity) SL (source level) correlation, was then applied to the training set data to formulate a transfer function to estimate the underwater radiated noise from onboard vibrations. The AQV is calculated from accelerometer measurements (vibration levels) and SL is obtained from the hydrophone measurements. The third octave frequency band (from 10 Hz to 10 kHz) SL estimations of the testing set runs (using the transfer function and AQV) are within 1 to 3 dB of SL from the hydrophone measurements. This study demonstrates a capability of monitoring underwater radiated noise from ships using only onboard vibration levels which may be of interest for future projects relating to the reduction of shipping noise against a threshold in acoustically sensitive environments.
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Shelley, N. A. "Noise & Vibration Control of Fast Ships." In International Conference on Noise & Vibration in the Marine Environment. RINA, 1995. http://dx.doi.org/10.3940/rina.nv.1995.8.

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Xiangyi, Zou, Jiang Guohe, Ye Linchang, and Li Baogang. "Surface vibration and noise analysis of POD Propeller of Construction Scientific Research Ship." In 2021 6th International Conference on Power and Renewable Energy (ICPRE). IEEE, 2021. http://dx.doi.org/10.1109/icpre52634.2021.9635511.

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Morel, P., D. Beghin, and M. Baudin. "Assessment of the Vibratory Behaviour of the Ships." In International Conference on Noise & Vibration in the Marine Environment. RINA, 1995. http://dx.doi.org/10.3940/rina.nv.1995.2.

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Cergol, Valter, Alessandro Toson, and Romualdo Di Giovanni. "Correlation Between the Calculated and On-board Measured Vibration and Noise Levels for a Passenger Ship." In SNAME 30th American Towing Tank Conference. SNAME, 2017. http://dx.doi.org/10.5957/attc-2017-0005.

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A comparative analysis is performed between the numerical calculations and the measurements carried out on board regarding noise and vibration levels on passenger ships. Based on the comparison, the accuracy of the results obtained with the numerical calculations is assessed and discussed.
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Cowling, G. "Public Address and Alarm Systems: Design and Assessment for Passenger Ships." In International Conference on Noise & Vibration in the Marine Environment. RINA, 1995. http://dx.doi.org/10.3940/rina.nv.1995.6.

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Blanchet, A., and G. Babin. "A New Method for Rating Impact Sound Insulation on Board Passenger Ships." In International Conference on Noise & Vibration in the Marine Environment. RINA, 1995. http://dx.doi.org/10.3940/rina.nv.1995.20.

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Reports on the topic "Ship noise and vibration"

1

Kuperman, W. A., and W. S. Hodgkiss. Tow-Ship Noise. Fort Belvoir, VA: Defense Technical Information Center, September 2004. http://dx.doi.org/10.21236/ada438454.

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Lewis, P. S., and S. Ellis. Active noise and vibration control for vehicular applications. Office of Scientific and Technical Information (OSTI), December 1998. http://dx.doi.org/10.2172/562543.

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Bodson, Marc. Adaptive Algorithms for Active Noise and Vibration Control. Fort Belvoir, VA: Defense Technical Information Center, July 2000. http://dx.doi.org/10.21236/ada390623.

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Baz, Amr M. Vibration & Noise Monitoring of Large Observation Platforms. Fort Belvoir, VA: Defense Technical Information Center, March 1999. http://dx.doi.org/10.21236/ada378823.

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Johnson, Brian, and Jerome S. Cap. Removal of Stationary Sinusoidal Noise from Random Vibration Signals. Office of Scientific and Technical Information (OSTI), February 2018. http://dx.doi.org/10.2172/1423933.

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Heitmeyer, Richard, Stephen C. Wales, Lisa A. Pflug, Thomas J. Hayward, and Iman W. Schurman. Ship-Induced Noise Predictions in the Atlantic and the Pacific: A Comparison of Two Noise Models. Fort Belvoir, VA: Defense Technical Information Center, May 2006. http://dx.doi.org/10.21236/ada473782.

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Calambokidis, John. Behavioral and Physiological Response of Baleen Whales to Ships and Ship Noise. Fort Belvoir, VA: Defense Technical Information Center, September 2013. http://dx.doi.org/10.21236/ada604988.

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Calambokidis, John. Behavioral and Physiological Response of Baleen Whales to Ships and Ship Noise. Fort Belvoir, VA: Defense Technical Information Center, September 2014. http://dx.doi.org/10.21236/ada617027.

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Kearney, Steven, and Deming Shu. A Survey of Floor Vibration Noise at All Sectors in the APS Experiment Hall. Office of Scientific and Technical Information (OSTI), January 2016. http://dx.doi.org/10.2172/1372294.

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Ikeda, Akihiro, Takumi Wakamatsu, Junzo Tamari, and Masanori Tajima. Development of Assessment Method for Vibration Characteristics of Disk Wheel on Road Noise Performance. Warrendale, PA: SAE International, September 2005. http://dx.doi.org/10.4271/2005-08-0592.

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