Academic literature on the topic 'Vibration measurement on board ship'
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Journal articles on the topic "Vibration measurement on board ship"
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Coppotelli, Giuliano, Daniele Dessi, Riccardo Mariani, and Marcello Rimondi. "Output-Only Analysis for Modal Parameters Estimation of an Elastically Scaled Ship." Journal of Ship Research 52, no. 01 (March 1, 2008): 45–56. http://dx.doi.org/10.5957/jsr.2008.52.1.45.
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The study of the ship structural response assumes an increasing importance as soon as the structures, characterized by much more lightness, are designed and built for faster vessels. This requisite implies a greater flexibility of the structures themselves, the elastic response of which has to be evaluated with accuracy in order to predict the dynamic behavior. In the present paper, a methodology for the identification of the modal parameters from the measurement of only the responses of a vibrating structure has been developed and applied to an elastically scaled model. This output-only technique is successfully applied to the segmented model of a real ship towed in the INSEAN linear basin. The broadband random excitation, provided by the loads exerted by an irregular sea pattern, induces a stochastic response of the model, which is monitored with accelerometers. The obtained results not only outline the parametric dependence of the modal properties on the ship speed, but also suggest a possible practical application of this technique for on-board structural monitoring and fatigue-life prediction.
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Matsumoto, Tomoya. "Differences in Noise Measurement Methods : Code on Noise Levels on Board Ships and Noise and Vibration Guidelines." Journal of The Japan Institute of Marine Engineering 51, no. 4 (2016): 477–78. http://dx.doi.org/10.5988/jime.51.477.
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Mansi, Francesca, Enza Sabrina Silvana Cannone, Antonio Caputi, Luigi De Maria, Leonardo Lella, Domenica Cavone, and Luigi Vimercati. "Occupational Exposure on Board Fishing Vessels: Risk Assessments of Biomechanical Overload, Noise and Vibrations among Worker on Fishing Vessels in Southern Italy." Environments 6, no. 12 (December 17, 2019): 127. http://dx.doi.org/10.3390/environments6120127.
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Sea fishing is one of the sectors with the highest risk of illness and work-related accidents. The purpose of the study is to evaluate the exposure of fishing workers to three major risks: biomechanical overload, noise, and whole-body vibrations. We used common methods and measurement tools in the field: observational video analysis, questionnaires, and direct measurement. Noise and vibrations levels were measured aboard five boats belonging to the main fishing communities of Southern Italy. The random sample consisted of 310 workers, of whom 108 agreed to complete a questionnaire to collect data on the perception of occupational risk and self-perception of health conditions. We found that fishermen had a high prevalence of osteoarticular pathologies (42%) and that the biomechanical overload risk is mainly related to handling manual loads. Furthermore, the results indicate that the levels of weekly noise exposure exceed the exposure limit value of 87 decibel A (dBA) for fishing workers, and that the most noisiest area is the engine room. Exposure levels to whole-body vibrations were below <0.5 m/s2. Knowledge on occupational hazards and health effects in the fisheries sector should be used to develop ship technology, raise awareness of the correct use of personal protective equipment, and improve health surveillance of these workers.
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L., PANA. "Measurement and analysis of vibrations of electric motors on board container ships." Scientific Bulletin of Naval Academy XXIV, no. 1 (July 15, 2021): 145–56. http://dx.doi.org/10.21279/1454-864x-21-i1-018.
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The purpose of this paper is to measure and analysis the vibrations of electric motors on board container ships, in order to reduce the maintenance costs and implicitly in making the optimal decisions. In general, the faults that underlie electric motors are primarily due to mechanical and electrical efforts. Mechanical stresses occur as a result the overloads and rapid load variations. On the other hand, the overcurrents and overvoltages are usually in the close accordance with the power supplies. In this regard the mechanical faults cannot be analyzed by changing the parameters like voltage, current, power, frequency but in practice we can do analysis by used the high-performance testers with intelligent software for measuring the motor vibrations. The MarVib DC650 tester was used in this paper for analysis and measurement the vibrations of electric motors.
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Bosoancă, R., and I. Bosoancă. "Practical evaluation of the vibrations of a rail mounted boom crane." IOP Conference Series: Materials Science and Engineering 1262, no. 1 (October 1, 2022): 012033. http://dx.doi.org/10.1088/1757-899x/1262/1/012033.
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Lifting devices are widely speeded in the shipbuilding industry and is compulsory to be used in order to be able to manipulate weights over 100 N on board of ships. Due to severe regulations all equipment must be designed, built and later tested for long and safe service time. The operational behaviour of lifting cranes has to be investigated and regularly controlled in order to avoid possible dysfunctions, excessive vibrations or unsafe operations on board of ships under constructions or during various lifting activities. Special procedures have been used to this purpose. The paper is focused on practical measurements of the vibrations of the main mechanisms of a number of four rail mounted boom cranes with hook 100t load and equipped with electric motors of 220 kW. In order to evaluate practical solutions to avoid vibratory behaviour, different working conditions have been taken into consideration. Based on the above-mentioned experimental program, the obtained results are reported and practical solutions are presented.
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Wen, Xiao Fei, Xing Di Wang, and Qiang Yuan. "A Study on Test Technology of Ship Shafting Torsional Vibration." Advanced Materials Research 199-200 (February 2011): 1423–28. http://dx.doi.org/10.4028/www.scientific.net/amr.199-200.1423.
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Ship shafting is a key component of ship power plant. Torsional vibration test for ship shafting is the essential step to ensure the safety of ship power systems. For the purpose of analyzing and comparing torsional vibration test methods, a study of the test methods, equipment and technology is carried out in this paper. Three different test methods are compared with each other by adopting two different test systems. The main propulsion and marine generator shafting torsional vibration characteristics are analyzed by using two different analysis methods respectively: the single order and resonance point method and the multi order and resonance point method. The results obtained in the process of testing on board ship may provide a good guidance for the further researches in this subject.
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Charchalis, Adam. "Measurement and Diagnostic System for Marine Engines." Journal of KONBiN 49, no. 3 (October 1, 2019): 33–48. http://dx.doi.org/10.2478/jok-2019-0049.
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Abstract The Scheduled Maintenance System allows ship-owners and operators to plan, carry out and document the maintenance and repair of equipment and mechanisms on board the ship at intervals in accordance with the class requirements imposed by the Classification Societies and the manufacturer of the equipment. In order to develop the research capabilities of the Faculty of Marine Engineering of Gdynia Maritime University, a Measurement and Diagnostic System has been developed to assess the technical condition of machinery and equipment in operation on board the ship. Modernization of measuring equipment, significantly expanded the research capabilities, which resulted in increasing the scope, improving quality, and speeding up the research and development work in the field of safety of operation and diagnostics of engine rooms and ship operation.
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Xue, Shufei, Shuochen Wu, Qing Tang, Shulin Liu, and Bai Liu. "Research on torsional vibration monitoring system of ship power shafting." IOP Conference Series: Materials Science and Engineering 1207, no. 1 (November 1, 2021): 012007. http://dx.doi.org/10.1088/1757-899x/1207/1/012007.
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Abstract In this paper, the real-time monitoring technology of ship power system torsional vibration is studied. The photoelectric non-contact measurement method is used to measure the torsional vibration intensity of shafting, and the analysis service network management platform is established to realize the functions of real-time monitoring of shafting torsional vibration and upload and collect alarm data, through the front-end system, the torsional vibration strength and other parameters of the shafting are collected and transmitted to the background. The data of the background system is used to calculate and analyze, and the status of the shafting is alarmed. The system realizes continuous monitoring and data recording of torsional vibration index of ship power system, and ensures the operation performance and safe operation of ship power system. It provides theoretical and technical support for the future development of new technologies and related research, such as durability simulation and durability virtual test of ship power critical parts.
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Wu, Tong-Ming. "Engineering Analysis on Vibration Characteristics of Merchant Vessels with Theoretical and Onboard Test Approaches." Marine Technology and SNAME News 38, no. 04 (October 1, 2001): 241–49. http://dx.doi.org/10.5957/mt1.2001.38.4.241.
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Recent development of ship design, such as flexible hull structures with somewhat light ship weight in terms of larger/longer/wider principal particulars and long-stroke diesel engine of high brake horsepower, has been demonstrated dramatically. Nevertheless, this kind of ship design concept harmfully degrades system stability of electronic instrumentation and operating performance of human beings in sea service. Therefore practical prediction on structural vibration behavior of designed vessels is of primary concern and has to be taken into account at the preliminary design stage. Two theoretical approaches, preliminary prediction by empirical formula and numerical solutions by finite-element technique (matrix analysis methodology), are briefly reviewed. An onboard test system for structural vibration measurement is developed and comprehensively described. In fact, a standard procedure of data acquisition and analysis system for structural vibration measurement is already set up to deal with several kinds of vibration research work in practical engineering fields. Natural frequencies of vibration behavior for a 1200 TEU container vessel are checked out by preliminary prediction of empirical formula and measurement data from onboard tests. Moreover, a comparison study by finite-element analysis and full-scale measurement is also performed on vibration characteristics of hull structures. The amplitude of vibration acceleration induced by unbalanced moment of the main engine is calculated for any point of hull at the resonance condition and the installation of an electrical balancer onboard is taken into account for vibration countermeasures also. All approximate predictions, compared with onboard test results, are found to meet with an acceptable level of engineering accuracy. The practical package of approximate approaches in both theoretical and onboard test aspects to investigate vibration characteristics of structures, for instance, hull, machinery, piping, and shafting system, in universal service is quite reliable and easily performed on portable computers for extensive engineering applications.
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Frank, DeBord, Hennessy William, and McDonald Joseph. "Measurement and Analysis of Shipboard Vibrations." Marine Technology and SNAME News 35, no. 01 (January 1, 1998): 1–9. http://dx.doi.org/10.5957/mt1.1998.35.1.1.
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Excessive shipboard vibrations can cause structural and machinery failures, crew discomfort and fatigue, and increased maintenance requirements for shipboard systems. In many cases ship construction specifications require the shipyard to demonstrate "acceptable " levels of vibration using measurements completed during sea trials. This paper provides an overview of standards for these measurements and modern techniques used to collect and analyze the specified vibration data. A brief discussion of the types of vibrations found on ships and their causes is followed by a review of codes, guides and standards for vibration measurement. Instrumentation suitable for measurement of each type of vibration response is described and the design of a typical trial measurement system is presented. Techniques for analyzing and presenting trial results are reviewed and compared with analysis methods specified by SNAME, ISO and NAVSEA. Finally, a discussion of potential problems faced by an owner and shipyard in developing and meeting a vibration measurement specification is offered.
Dissertations / Theses on the topic "Vibration measurement on board ship"
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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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2013/2014Gli 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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Arn, Krissa Elizabeth 1980. "Design of a non-contact vibration measurement and analysis system for electronic board testing." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/18070.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.Includes bibliographical references (p. 107).
Traditional vibration measurement methods involve placing accelerometers at discrete locations on a test object. In cases where the test specimen is small in mass, the addition of these measurement transducers can alter its dynamic behavior and lead to erroneous test data. In this thesis a Non-Contact Vibration Measurement and Analysis System has been designed, built, and tested for electronic board testing. Through a product design process, all feasible methods were considered and three optically based concepts were explored: holographic interferometry, area scaling, and displacement sensor grid. Through concept testing and analysis, the displacement sensor grid method was chosen for the design. The final system incorporates four laser displacement sensors with a vertical scrolling mechanism that attaches to the vibration table's side rails. This manual scanning system provides a quick, low cost method for capturing multiple points on the test object during vibration testing. The MATLAB based software package acquires the raw sensor output and processes it with a five step analysis program. With this software, an 8x4 grid of electronic board displacements were easily transformed into a movie showing the board displacing through its first mode. The system requires the sensors be positioned lcm away from the test object with the sensors reading up to [plus-minus]lmm of movement. The sensors have a maximum sample rate of 7.8 kHz and can be used to measure the displacements of any surface type or material. The measurement grid resolution is 0.7 inches horizontally 0.4 inches vertically. Testing showed that the system captured the natural frequency and peak displacement of the board's first mode within 1.5% accuracy and 0.7% accuracy respectively
(cont.) when compared with previous accelerometer grid testing. Exceeding its design goals, this non-contact measurement and analysis device provides a highly versatile, accurate, and low cost optical alternative to accelerometers. Also it shows numerous benefits over more complex and costly optical measurement methods. The use of this system eliminates any question of whether mass loading effects are tainting vibration test data. A hardware and software manual are included for reference at the end of this thesis along with a software CD.
by Krissa Elizabeth Arn.
S.M.
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Schneider, Nathan A. "Prediction of surface ship response to severe underwater explosions using a virtual underwater shock environment." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FSchneider.pdf.
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Thesis (Mechanical Engineer and M.S. in Mechanical Engineering)--Naval Postgraduate School, June 2003.Thesis advisor(s): Young S. Shin. Includes bibliographical references (p. 161-162). Also available online.
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Haugen, Petter. "Automotive Energy Harvesting." Thesis, Mittuniversitetet, Institutionen för elektronikkonstruktion, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-37606.
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Vibration measurements conducted in three vehicles windshields are used to determine frequency content in the windshield of moving vehicles. A piezoelectric energy harvester is modeled, and used in simulations to determine output voltage and power with measured acceleration signal as input.
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Petrusa, Douglas C. "Evaluation and analysis of DDG-81 simulated athwartship shock response." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FPetrusa.pdf.
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Chen, Rui-Bin, and 陳瑞彬. "Ship Vibration Assessment Using Measurement Database." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/47773579640778303258.
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碩士國立高雄海洋科技大學
造船及海洋工程研究所
104
Ship vibration has great impact on ship equipment, structure safety, and passenger comfort. Over the years, shipbuilding corporations has accumulated significant amounts of ship vibration measurement data, by conducting vibration analysis at design time and measuring vibration reaction at sea for newly built ship. There are two ways to assess vibration of a ship hull in the design stage. One is using the empirical formula. The other is using finite element analysis method. In this research, not only used empirical formula to assess the natural frequency but also used the MSC/Patran (pre/post processors) and MSC/Nastran (solver) to analyze natural frequency and mode shapes. In order to ensure accuracy of the natural frequency assessed with empirical formula and finite element analysis method. This research used the onboard measurement of vibration reaction to modify the analysis, let the assessment closer to the measurement. Offer the newly ship design and assess the ship vibration.
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Huong, Nguyen Van, and 阮文享. "Development of Measurement System for Ship Vibration." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/31025946114395326981.
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碩士國立高雄海洋科技大學
造船及海洋工程研究所
101
Abstract The purpose of this research is to develop a complete measurement and analysis system for the hull vibration. For local vibration of ship, the measurement requests to conform with ISO 6954:1984 or ISO 6954:2000 specifications, to address this issue this study has been successfully estab- lished a feature of analysis. Thus can be processing and analyzing real time data. In addition, order analysis method is used for establishing the relationship between the vibration amplitude and the rotation speed of main engine and propeller. This investigation had integrated the LabVIEW graphical language and modular hardware to develop an effective measurement and analysis system. The hardware adopted data acquisition NI - 9234. The Compact DAQ-9188 has been used for simultaneous measure multi-position. Through connected and internal designed, the system could be processing and integrating data immediately. Field tests were conducted in measurement to verify the performance of the system, including effect of cable to signal quality, rotation speed confirming, applying finite element method to conform modal testing. Otherwise, the result revealed on the shipboard vibration is proven this system could be stability operating, then the system fulfills the practical application demands also widely applies in different areas of vibration measurement. Key words: Hull vibration, Measurement system, Data acquisition,Order analysis, Modal analysis
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Huang, Bo-Jhih, and 黃柏智. "Development of Measurement Database System for Ship Vibration." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/53795832012505449302.
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碩士國立高雄海洋科技大學
造船及海洋工程研究所
104
This research focuses on the design and implementation of a ship vibration measurement, and development of an intuitive front-end windows application for data maintenance. Over the years, Shipyard has collected a few dozens of ship vibration measurement data during the sea trials. However, the storage medium for these measurement was through analog tapes, which is not only hard to utilize in current digital computing world and is becoming harder to extract data using the available reader. In order to preserve the valuable ship vibration measurement results, these analog measurement data was first digitized, and later cataloged into our proposed database management system through the designed software. The propose database and software solution is intuitive and convenient. An end user can easily add new measurement data and manage ship information through the developed software. In addition, through one simple click on the software screen, a user is allowed to perform the entire collection of analysis, and generate plots and graphs on the stored data. With ever increasing data managed by the database, we will be able to utilize the statistical analysis result to help evaluate the vibration of a new ship design, as well as advising improved ship structure vibration evaluation protocol through cross referencing the real measurement data with respect to the mathematical ship body vibration analysis method. Keywords: ship vibration, onboard measurement, vibration analysis, order analysis, database
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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.
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碩士國立臺灣海洋大學
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.
Books on the topic "Vibration measurement on board ship"
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P, Lin Paul, and NASA Glenn Research Center, eds. Monitoring the microgravity environment quality on-board the International Space Station using soft computing techniques. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2001.
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P, Lin Paul, and NASA Glenn Research Center, eds. Monitoring the microgravity environment quality on-board the International Space Station using soft computing techniques. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2001.
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Monitoring the microgravity environment quality on-board the international space station using soft computing techniques. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2002.
Find full textBook chapters on the topic "Vibration measurement on board ship"
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Bassetti, Mirko, Riccardo Tonna, Tatiana Pais, Paolo Silvestri, Enrico Lembo, and Andrea Iuliano. "Application of Transfer Path Analysis Technique to Cruise Ships." In Progress in Marine Science and Technology. IOS Press, 2022. http://dx.doi.org/10.3233/pmst220047.
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The transfer path analysis (TPA) method is considered to be an important and effective tool for identifying vibration and noise (VN) sources and main transfer paths. This technique is commonly developed and well-established in the automotive field. In contrast it has not been applied to in naval architecture yet, accounting for the complexity of the path, the higher number of the receivers’ locations and the many sources on board (e.g. engine, propeller, generator, pumps…). In this paper, the Polytechnic School of the University of Genoa, together with Cetena, presents a preliminary approach for applying the TPA technique in the marine field to a cruise ship. After a comprehensive review of the method, the results of the TPA application are presented by analysing the measurements taken during a sea trial.
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Bassetti, Mirko, Maurizio Morelli, Attilio Binotti, Enrico Lembo, and Andrea Iuliano. "Airborne Sound Propagation Induced by a Cruise Ship Through Simulation and Correlation with Real Measurements." In Progress in Marine Science and Technology. IOS Press, 2022. http://dx.doi.org/10.3233/pmst220046.
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The publication of the Lloyd’s Register notation [1], in addition to port and civil regulations, may in the future result in shipowners requesting certification of the airborne noise levels emitted by their vessels, necessary to access areas of natural interest or certain ports [2]. This study models the sound propagation induced by a cruise ship using a software tools, starting with a database of measurements and calculations on the sound power generated by the main sources in accordance with ISO 9614-1 [3] and 9614-2 [4]. The results compared with real measurements in the far field showed the need to calibrate the model through a campaign of measurements of on-board sources in terms of sound power and pressure. The experimental measurements of sound pressure and power were used as input for the numerical models that were developed using a commercial software package, estimating in advance the noise levels measured at different distances from the vessel. In a subsequent phase of the study, the estimated data were compared with those calculated through a second experimental measurement campaign performed under the operating conditions indicated by the Lloyd’s Register Class Notation and at progressive distances from the vessel. The simulations allow to estimate the contribution of the individual sources for any desired point and the interventions ad hoc to improve comfort levels in specific positions on board that can be obtained by optimising interventions on the sources to a minimum. The development of this approach has resulted in a predictive tool with a degree of accuracy in the range required by ISO 9613 [5] and therefore capable of assessing the airborne noise emitted, comparing it with the limits imposed by the LR’s regulations or, in general, by port and civil regulations. This approach is also a useful tool for estimating the noise level in external passenger areas and therefore for a project aimed at improving on-board comfort.
Conference papers on the topic "Vibration measurement on board ship"
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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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Magionesi, Francesca, and Elena Ciappi. "Characterization of the Response of a Curved Elastic Shell to Turbulent Boundary Layer." In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30738.
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For the effective operation of sonar system mounted inside the bulbous of a fast ship, it is important to reduce all the possible noise and vibration sources that cause the dome to vibrate thus radiating noise and interfering with sonar sensor response. In particular, pressure fluctuations induced by the turbulent boundary layer on the surface of the sonar dome represent one of the major sources of self-noise for the on board sensors. Calculation of the structural vibrations and of the noise radiated inside the dome requires as a first step the characterization of the frequency spectra of turbulent boundary layer excitation. Most of the literature related to wall pressure fluctuations is devoted to the study of equilibrium turbulent boundary layers on flat plates in zero pressure gradient (ZPG) flow, for which scaling laws for the power spectral densities and empirical models for the cross spectral densities are well established. The turbulent boundary layer on the bulbous can present several differences with respect to the canonical case because of the presence of hull surface curvatures and of the free water surface that produce pressure gradient variation along the bulbous surface. Moreover, hydrodynamic coincidence effects play a markedly different role in the underwater problem than in the aerodynamic problem. Therefore, an experimental campaign was performed in a towing tank to measure wall pressure fluctuations at different locations along a large scale model of a bulbous and to investigate their spectral characteristics in terms of auto and cross spectral densities. Boundary layer mean flow parameters were obtained with a finite volume code solving the Reynolds Averaged Navier Stokes Equations. The auto spectral densities (ASD) of the measured wall pressure fluctuations were scaled using different combinations of inner and outer flow parameters in order to make ASD independent of the tested conditions i.e. of Reynolds number. The modelled load was used as input for a numerical procedure aimed at evaluating the dynamical response of a section of the bulbous under analysis. The validation of this procedure was experimentally obtained through the measurements of the vibrational response of an elastic section inserted into the bulbous model. Moreover, this comparison indirectly provides additional insights on the physics of wall pressure fluctuations for complex flows.
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Charchalis, A. "Diagnosing ship propulsion by vibration measurement for navigation safety." In RISK ANALYSIS 2008. Southampton, UK: WIT Press, 2008. http://dx.doi.org/10.2495/risk080531.
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Hong Men, Jianguo Wang, Jing Gao, and Ping Wang. "On Board-ship Seawater Heavy Metal Automatic Measurement System Based on Electronic Tongue." In 2006 6th World Congress on Intelligent Control and Automation. IEEE, 2006. http://dx.doi.org/10.1109/wcica.2006.1713352.
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Guo, Minmin, Yongming Nie, and Longzhi Xie. "Measurement of slight angle of ship board dynamic platform based on bi-Fresnel prisms." In 2015 International Conference on Intelligent Systems Research and Mechatronics Engineering. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/isrme-15.2015.60.
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Kubota, Hiromichi, Masanari Taniguchi, Shosuke Suzuki, and Tasuku Takagi. "3-D Graphic Image of Vibration Pattern of Printed Circuit Board by Using Holography." In 2007 IEEE Instrumentation and Measurement Technology Conference. IEEE, 2007. http://dx.doi.org/10.1109/imtc.2007.379279.
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Cheng, Zhongyi, Junning Cui, Yamin Zhao, and Mingrui Jin. "Time Domain Response Analysis of Ship Power Equipment Vibration Isolation System under Shock." In 2021 IEEE 15th International Conference on Electronic Measurement & Instruments (ICEMI). IEEE, 2021. http://dx.doi.org/10.1109/icemi52946.2021.9679561.
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Kim, Sang-Yeob, Min-Su Kim, Ki-Min Han, Joon-gyu Kim, and Dae-Won Seo. "Study on Data Analysis of On-Board Measurement Data for Ship’s Speed Power Performance." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-19153.
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Abstract Present paper deal with data analysis of on-board measurement data from operating ship. The main purpose of the study is estimating speed-power performance of target ship which are in service now. Various kinds of on-board measured data are considered such as ship speed, engine RPM, brake power, draught, rudder angle, etc. Also, in order to estimate the added resistance, weather forecast data about wind, wave and current was considered. What this study found was that the onboard measurement data and weather forecast data have a lot of uncertainty, so the data need to be post-processed in order to derive reliable speed power performance curve. For this reason, current study proposed three-step filtering procedure. The filtering schemes are based on 1) absolute threshold value, 2) moving window, 3) derivative threshold value. The paper compared the performance estimation results of ship with and without filtering technique and some conclusions could be drawn.
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Donavan, Paul R. "Use of the ASTM Standard Reference Test Tire as a Benchmark for On-Board Tire/Pavement Noise Measurement." In SAE 2009 Noise and Vibration Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2009. http://dx.doi.org/10.4271/2009-01-2108.
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Suyuthi, Abdillah, Bernt J. Leira, and Kaj Riska. "Full Scale Measurement on Level Ice Resistance of Icebreaker." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-50066.
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This paper presents results from the investigation of ship resistance on first year level ice in the Barent Sea. The basis for the work is the availability of full scale measurement data obtained on board of KV Svalbard in 2007. Measurements were made of the ice thickness, ship speed over ground in addition to setting power. The ice thickness was measured by means of an electromagnetic device, which enables careful selection of the time sequences for which level ice is present. By utilizing Newton II law and conservation of energy, the total resistance can be determined. The ice resistance in level ice was then obtained by subtracting the open-water resistance from the total resistance. The open-water resistance was measured when the ship was traveling in open water during the expedition. The relationship between the ship resistance and the ship speed over ground in level ice was finally obtained and compared with the Lindqvist formulation of estimation of ice resistance.
Reports on the topic "Vibration measurement on board ship"
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Plueddemann, Albert, Benjamin Pietro, and Emerson Hasbrouck. The Northwest Tropical Atlantic Station (NTAS): NTAS-19 Mooring Turnaround Cruise Report Cruise On Board RV Ronald H. Brown October 14 - November 1, 2020. Woods Hole Oceanographic Institution, January 2021. http://dx.doi.org/10.1575/1912/27012.
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The Northwest Tropical Atlantic Station (NTAS) was established to address the need for accurate air-sea flux estimates and upper ocean measurements in a region with strong sea surface temperature anomalies and the likelihood of significant local air–sea interaction on interannual to decadal timescales. The approach is to maintain a surface mooring outfitted for meteorological and oceanographic measurements at a site near 15°N, 51°W by successive mooring turnarounds. These observations will be used to investigate air–sea interaction processes related to climate variability. This report documents recovery of the NTAS-18 mooring and deployment of the NTAS-19 mooring at the same site. Both moorings used Surlyn foam buoys as the surface element. These buoys were outfitted with two Air–Sea Interaction Meteorology (ASIMET) systems. Each system measures, records, and transmits via Argos satellite the surface meteorological variables necessary to compute air–sea fluxes of heat, moisture and momentum. The upper 160 m of the mooring line were outfitted with oceanographic sensors for the measurement of temperature, salinity and velocity. Deep ocean temperature and salinity are measured at approximately 38 m above the bottom. The mooring turnaround was done on the National Oceanic and Atmospheric Administration (NOAA) Ship Ronald H. Brown, Cruise RB-20-06, by the Upper Ocean Processes Group of the Woods Hole Oceanographic Institution. The cruise took place between 14 October and 1 November 2020. The NTAS-19 mooring was deployed on 22 October, with an anchor position of about 14° 49.48° N, 51° 00.96° W in 4985 m of water. A 31-hour intercomparison period followed, during which satellite telemetry data from the NTAS-19 buoy and the ship’s meteorological sensors were monitored. The NTAS-18 buoy, which had gone adrift on 28 April 2020, was recovered on 20 October near 13° 41.96° N, 58° 38.67° W. This report describes these operations, as well as other work done on the cruise and some of the pre-cruise buoy preparations.
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Bigorre, Sebastien P., and Raymond Graham. The Northwest Tropical Atlantic Station (NTAS): NTAS-20 Mooring Turnaround Cruise Report Cruise On Board RV Pisces November 4-28, 2021 Newport, RI - Pascagoula, MS. Woods Hole Oceanographic Institution, February 2023. http://dx.doi.org/10.1575/1912/29647.
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The Northwest Tropical Atlantic Station (NTAS) was established to address the need for accurate air-sea flux estimates and upper ocean measurements in a region with strong sea surface temperature anomalies and the likelihood of significant local air–sea interaction on interannual to decadal timescales. The approach is to maintain a surface mooring outfitted for meteorological and oceanographic measurements at a site near 15°N, 51°W by successive mooring turnarounds. These observations are used to investigate air–sea interaction processes related to climate variability. The NTAS Ocean Reference Station (ORS NTAS) is supported by the National Oceanic and Atmospheric Administration’s (NOAA) Global Ocean Monitoring and Observing (GOMO) Program (formerly Ocean Observing and Monitoring Division). This report documents recovery of the NTAS-19 mooring and deployment of the NTAS-20 mooring at the same site. Both moorings used Surlyn foam buoys as the surface element. These buoys were outfitted with two Air–Sea Interaction Meteorology (ASIMET) systems. Each system measures, records, and transmits via satellite the surface meteorological variables necessary to compute air–sea fluxes of heat, moisture and momentum. The upper 160 m of the mooring line were outfitted with oceanographic sensors for the measurement of temperature, salinity and velocity. The mooring turnaround was done by the Upper Ocean Processes Group of the Woods Hole Oceanographic Institution (WHOI), onboard R/V Pisces, Cruise PC-21-07. The cruise took place from November 4 to 28, 2021. The NTAS-20 mooring was deployed on November 12, and the NTAS-19 mooring was recovered on November 13. Limited inter-comparison between ship and buoys were performed on this cruise. This report describes these operations and the pre-cruise buoy preparations. Other operations during PC-21-07 consisted of one CTD cast near the Meridional Overturning Variability Experiment (MOVE) subsurface mooring array MOVE 1-14. MOVE is designed to monitor the integrated deep meridional flow in the tropical North Atlantic.