Дисертації з теми "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.
Повний текст джерелаRaggio, 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.
Повний текст джерелаThis 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.
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.
Повний текст джерелаGli 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
Velonias, Platon Michael. "Vibration analysis of a SWATH-type ship." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/38129.
Повний текст джерелаGraham, William Richard. "Boundary-layer noise and vibration." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308331.
Повний текст джерелаKörning, 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.
Повний текст джерелаKörning, 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.
Повний текст джерелаTratch, Jorge. "Vibration transmission through machinery foundation and ship bottom structure." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/15216.
Повний текст джерелаMICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.
Includes bibliographical references.
by Jorge Tratch Junior.
Mech.E
Huang, Yuan. "Human response to combined noise and vibration." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/348814/.
Повний текст джерелаLin, 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.
Повний текст джерелаLin, Tian Ran. "Vibration of finite coupled structures, with applications to ship structures /." Connect to this title, 2005. http://theses.library.uwa.edu.au/adt-WU2006.0093.
Повний текст джерелаGodaliyadde, Darshana. "Application of formal safety assessment for ship hull vibration modelling." Thesis, Liverpool John Moores University, 2008. http://researchonline.ljmu.ac.uk/5898/.
Повний текст джерелаAkl, Wael Nabil. "Smart foam for active vibration and noise control." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/222.
Повний текст джерелаThesis research directed by: Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
O'Boy, Daniel John. "Tyre/road noise : vibration of the tyre belt." Thesis, University of Cambridge, 2005. https://www.repository.cam.ac.uk/handle/1810/251965.
Повний текст джерелаRandle, Perri. "Noise and Vibration Control for a Decanting Centrifuge." Thesis, University of Canterbury. Mechanical, 2011. http://hdl.handle.net/10092/5987.
Повний текст джерелаWinberg, Mathias. "Noise and Vibration Control of Combustion Engine Vehicles." Doctoral thesis, Karlskrona : Blekinge Institute of Technology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00281.
Повний текст джерелаLong, Stephen Andrew. "Acoustic noise and vibration of switched reluctance machines." Thesis, University of Sheffield, 2002. http://etheses.whiterose.ac.uk/14498/.
Повний текст джерелаSchaberg, P. W. "Knock-induced noise and vibration in I.C. engines." Thesis, University of Cape Town, 1991. http://hdl.handle.net/11427/23513.
Повний текст джерелаDayou, Jedol. "Global control of flexural vibration of a one dimensional structure using tuneable vibration neutralisers." Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310842.
Повний текст джерелаJha, Akhilesh K. "Cyclostationary Random Vibration of a Ship Propeller and a Road Vehicle." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/34486.
Повний текст джерелаMaster of Science
Matusiak, Jerzy. "Pressure and noise induced by a cavitating marine screw propeller." Espoo : Valtion teknillinen tutkimuskeskus, 1992. http://catalog.hathitrust.org/api/volumes/oclc/25913793.html.
Повний текст джерелаCheng, Yi. "Acoustic noise and vibration of brushless motors for fans." Thesis, University of Leicester, 2005. http://hdl.handle.net/2381/34751.
Повний текст джерелаHowarth, Henrietta Victoria Carmel. "Annoyance caused by railway vibration and noise in buildings." Thesis, University of Southampton, 1989. https://eprints.soton.ac.uk/52250/.
Повний текст джерелаGuo, Ningqun. "The vibration characteristics of piezoelectric discs." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/11449.
Повний текст джерелаVipperman, Jeffrey S. "Adaptive feedforward control of broadband structural vibration." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-12302008-063428/.
Повний текст джерелаMunn, Jacqueline Marie. "Virtual sensors for active noise control /." Title page, abstract and table of contents only, 2003. http://web4.library.adelaide.edu.au/theses/09PH/09phm9668.pdf.
Повний текст джерелаJasti, Srichandana. "Design of randomly placed microphone array." Birmingham, Ala. : University of Alabama at Birmingham, 2006. http://www.mhsl.uab.edu/dt/2006m/jasti.pdf.
Повний текст джерелаForrest, James Alexander. "Modelling of ground vibration from underground railways." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323675.
Повний текст джерелаAlexiou, Kimon. "Comparison of multi-point vibration test methods." Thesis, Queen Mary, University of London, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325279.
Повний текст джерелаNewman, M. J. "Active vibration control using a distributed controller." Thesis, University of Southampton, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262146.
Повний текст джерелаWang, Anbin. "Vibration analysis of fluid filled pipework systems." Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323805.
Повний текст джерелаNelson, Cory Lee. "Reducing phase noise degradation due to vibration of crystal oscillators." [Ames, Iowa : Iowa State University], 2010. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1476330.
Повний текст джерелаLo, Chun Sing. "Application of cementitious rubber chips as noise and vibration barriers /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202005%20LO.
Повний текст джерела朱炳年 and Ping-nin Raymond Chu. "The vibration and noise radiation characteristics of damped sandwich structures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1987. http://hub.hku.hk/bib/B31231123.
Повний текст джерелаEsgandari, Mohammad. "Simulation methods for vehicle disc brake noise, vibration & harshness." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/5762/.
Повний текст джерелаOppenheimer, Charles Hugh. "Impact-induced noise and vibration in machine systems for design." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/12614.
Повний текст джерелаLuo, Jian. "Frequency domain iterative tuning for active noise and vibration control." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/63858/.
Повний текст джерелаHarne, Ryan. "Novel Lightweight Noise and Vibration Control Treatments for Marine Structures." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/34621.
Повний текст джерелаMaster of Science
Wright, Richard I. "A Hierarchical Noise Control System Using Adaptable Tuned Vibration Absorbers." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/11217.
Повний текст джерелаPh. D.
Kim, Seungbo. "Structure-borne noise transmission through a multi-dimensional vibration isolator /." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486399451959589.
Повний текст джерелаCahill, John J. "Experimental studies of noise/vibration damping for undersea warfare applications." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Jun%5FCahill.pdf.
Повний текст джерелаChu, Ping-nin Raymond. "The vibration and noise radiation characteristics of damped sandwich structures /." [Hong Kong] : University of Hong Kong, 1987. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12223001.
Повний текст джерелаRule, Ruth Anne. "Vibration-based damage detection in ceramics and glass." Thesis, Loughborough University, 2000. https://dspace.lboro.ac.uk/2134/27153.
Повний текст джерелаAnanthaganeshan, Kanapathipillai Arunachalam. "Stability and performance of active vibration isolation systems." Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273915.
Повний текст джерелаWei, David, and 魏宏源. "Ship Hull Vibration And Its Underwater Radiated Noise." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/95307575782451055935.
Повний текст джерела國立臺灣大學
造船工程學系
81
The main goal of this paper is to determine the dominant source of the underwater noise radiated from a surface vessel at mid-frequency range. We find that it is not the "MACHINE-NOISE" but the "FLUID -NOISE" resulted from thep propeller. This could be demonstrated by the following arguement according to the experimental data : (1) The amplitude of the plate vibration of the side wall in the machine room of the ship and the water , did not increase with the increasing of rotating speed of the main engine ,that is, the underwater radiational noise induced by the main engine is NOT significant in the ship''s underwater ship noise. (2) When the hull plate of the A.P. part of the ship is forced by the "FLUID-NOISE" ,there is a wide-band noise observed in the far- field pressure field . The near-field pressure at the wet side of the hull plate of A.P part is predicted by "GALERKIN METHOD " and " MIN. ERROR METHOD ".the resonat mode of plate vibration is not in the far-field measured data while it exits in the near-field theoretical predication.
Shuh, Dino, and 束文龍. "Ship Vibration Transmission and the Prediction of Underwater Noise." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/14552132360696163870.
Повний текст джерела國立海洋大學
造船工程學系
82
In this report, we use the Statistical Energy Analysis method to calculate the ship vibration transmission and the underwater noise due to the engine vibration. An engine room model was built to perform vibration transmission and underwater radiated noise tests. Then, the results predicted by Statistical Energy Analysis were compared with those from experiments. The comparison shows good agreement between Statistical Energy Analysis and the experimental result.
Chen, Yan-Cheng, and 陳彥棖. "Measurement and Analysis of Vibration and Noise of Container Ship Cabin." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/e7pbbu.
Повний текст джерела國立臺灣海洋大學
系統工程暨造船學系
106
In this research, the level of noise and vibration of the engine room, steering gear room and Tally office of a 2800TEU container ship were investigated by on-site measurements which include the utilization of accelerometers, microphones and acoustic cameras. Additionally, the estimation procedure of cabin noise is established, and the results of the measurement and analysis show the same trend. First, taking the acoustic camera is used to find the locations having maximum noise, and then the accelerometers and microphones measures the signal during the different conditions. In the signal processing, the author plots the spectrogram and one third octave band by using short-time Fourier transform and time-averaging approach in order to reduce the noise effect. There are two following results found by this research: One, during stable navigation the vertical vibration frequency is same as the noise frequency, and the frequency of propeller and the largest engine excitation force and its harmonic frequency often appear in the spectrogram’s peaks in cabin noise. Another, the spectral distribution of cabin noise is mainly below 250 Hz, and the maximum sound pressure level usually happens at the center of the plate. Apart from on-site measurements, simulations of simple conditions are carried out numerically find the vertical vibration frequency of the plate is found to compare favorably with the peak frequency obtained by noise; however, there is a significant amount of deviation when comparing the amplitudes. Because of the values of noise contribution caused by the different vibration modes are different. For the whole container ship, numerically, the noise level under different excitation forces is carried out by simulating the acoustic field in the cabins; the excitation forces are available from the finite element results provided by the shipyard. The result of the analysis shows that rooms on the higher floor having the higher noise level, and also the rooms near the center of the superstructure.
Liu, Zeng-Jir, and 柳政吉. "The Effects of High Speed Diesel Engine for Ship Vibration and Underwater Noise." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/00236805667324897471.
Повний текст джерела國立臺灣大學
造船工程學系
81
ABSTRACT The purpose of this paper is airmed to study the unbalance orces and moments of high speed disel generator and to predicthe corresponding response for ship vibration and underwateroise. In this report the developments of software on PC for analysisf unbalance moments and forces of V-type with intermediate crankrrangement of high speed disel engine is represented at first The 2nd port is using the pre & post procession of MSC/XL tostablish the F.E.M 3D+1D model for the analysis of ship naturalrequency and local frequency response by MSC/NASTRAN. In theeantime, the transfer matrix method develop in own LAB. haveeen for checking purpose and to study the boundry condition forD local analysis. Finally , with the method of MSC/NASTRAN V67 to solve under-ater noise distribution and local sound pressure level generatelyhip hull plate structure under excitation of unbalance forcesnd moments of disel generator. At last the comparision of theesults with exprimental data[6] and theoritical solution[13]ave been discussed.
Wang, Hsin-Ta, and 王星達. "Prediction of Noise and Vibration of a FRP ship and correlations with measurements." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/87126827016320385460.
Повний текст джерела國立臺灣海洋大學
系統工程暨造船學系
92
The aim of this research is to establish the prediction model for noise and vibration of a FRP ship. Furthermore predictions and measurements were compared in order to validate the correctness between them. In vibration simulations, FEM model of a FRP ship was constructed using MSC Patran software. And the analysis was performed in two conditions, one is the ship in dry vacuum condition and the other one is the ship in wetted condition, and the added mass was calculated by using virtual mass method in MSC Nastran. Meanwhile, vibration test was conducted on a FRP patrol boat of fifteen meters in length and twenty tons in weight, which is built by LUNG TEH SHIPBUILDING CO. in SU-AO. An accelerator and spectrum analyzer were used to measure and analyse the frequency response function during the aft deck is impacted by a hammer. Input the results of measurements to ME’Scope software to attain the mode shape of the aft deck. In the aspect of noise simulations, the results of frequency response function of a FRP ship were measured and input to the SYSNOISE BEM software, and proceed to analyze the noise distributions in pilot house. Also, the noise in the pilot house was measured by sound level meter in one third octave band of the above-mentioned ship, when the ship sailing with main engine output 85﹪and rotational speed at 2000rpm. The prediction model of noise and vibration in this research has become a complete simulation process for the structure-borne vibration radiated noise. However, vibration modal test is the hardest work in this research. So only the aft deck of the ship was undergoing measurement, and proceed to compare the measurements with the predictions. Key words:FRP ship、vibration、noise、added mass、frequency response
Lin, Li-min, and 林岦民. "The Study of Engine-Room Structural Vibration and Noise Coupling of Merchant Vessel - A Case Study of 1,800 T.E.U. Container Ship." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/hv626h.
Повний текст джерела國立臺北科技大學
製造科技研究所
103
Most of the merchant ships are designed to use two-stroke diesel engine in order to generate powerfully propulsive efficiency. The diesel engine installs in the closed engine-room space so as to producing very higher sound pressure than any other area in a ship. In this study, by the use of CATIA V5 to construct a model of a container vessel’s engine-room in accordance with the shipping company’s specification, and utilizing LMS Virtual.Lab 12 “Noise &; Vibration” simulating function to simulate the exciting effect of the vessel’s economic speed revolution. After that, by using Finite Element Method to analyze the affection of the engine-room’s structural vibration under the exciting force. In principle, the analysis of noise and vibration is based on sound pressure which is calculated by structural vibration values. In this study, the economic speed revolution of main diesel engine is 101.4 RPM and it is under 90% of maximum output power, the frequency is about 10.14 Hz, considering of this condition as the structural vibration parameters. The sound field distribution could be based on the structural mode analysis and exciting force data, then we could perform the analysis of vibro-acoustic coupling simulation. After calculating the sound pressure distribution of the engine-room, attaching different thicknesses sound-absorbing material of 25 mm, 50 mm, and 75 mm respectively on the surfaces of roof, forehead, astern, port and star sides of engine-room in order to assess the noise improvement. As the results of comparison are shown the sound pressure average values of all cases of the situation of 50 mm thick sound-absorbing material performed much better than those of 25 mm thick sound-absorbing material. The situation of 75 mm thick sound-absorbing material performs the best result, but it shows slight differences by comparing with that of 50 mm thick sound-absorbing material. We need to consider the costs of materials, construction, personnel, return of investment, and other factors in practical noise improvement plans, in other words, we must also think over the economic fundamentals.