Journal articles: '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.

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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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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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Jung, Byung Chang, Young-Cheol Huh, Tae-Young Chung, Jung-Hoon Chung, and Eung-Sik Jeon. "Development of a wireless measurement system for ship vibration in a sea trial." Noise Control Engineering Journal 66, no. 3 (May 1, 2018): 287–99. http://dx.doi.org/10.3397/1/376624.

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Jamal, A. Sulisetyono, and W. D. Aryawan. "Direct Measurement of Motion on Fast Ferries." IOP Conference Series: Earth and Environmental Science 1081, no. 1 (September 1, 2022): 012036. http://dx.doi.org/10.1088/1755-1315/1081/1/012036.

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Abstract This paper describes a new identification method for the fast ferry motions by using the direct measurements on the ship’s board. The inertial sensor type of the Analog Devices (ADIS) 16364 is selected as a as suitable instrument to measure accelerations and velocity of the ship motions namely heave, pitch, and roll in time domain. Furthermore, the ship motion responses are transferred as the energy spectral density in frequency domain which are identified using the Fast Fourier Transform (FFT) method. For the case study, the measurement equipment was placed on the navigation room of MV. Dumai Line 12 recording in 15 minutes within ship voyage from Bengkalis to Batam in September 2021. Finally, the natural frequencies of heave, pitch, and roll motions are identified about 0.568 rad/s, 0.117 rad/s, and 0.227 rad/s, respectively.

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Li, Hui Feng, Wei Kang Zhu, Guo Hu Xue, Xian Chun Xu, and Li Ping Di. "Calibration Technology and Axial Error Correction Method." Advanced Materials Research 889-890 (February 2014): 653–57. http://dx.doi.org/10.4028/www.scientific.net/amr.889-890.653.

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To meet the demand of ship-board TT&C equipment measurement precision, its necessary to calibrate the equipment to define the error parameters. And the error parameters should be suitable for the revising model. Based on the research of instrumentation ships calibration technology and angle error revising theory of the ship-board TT$C equipment, this article found the error of the revising model of the ship-board TT&C equipment and bring forward the updated model how to revise the angle error by calibration for zero method, which solved the problem that azimuth error aperiodically arises.

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Wang, Xue Ren, Xu Hong Miao, Chun Hui Yuan, De Jin Qian, and Di Jia. "Application of the Force Transferring Technique for Marine Machineries." Applied Mechanics and Materials 226-228 (November 2012): 26–29. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.26.

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It is necessary and valuable to build the transferring relationship between test bed datum and ship datum for satisfying the boundary requirements of exciting forces in ship’s vibration-acoustic analysis. Principle of the force transferring technique for machineries with multiple supporting points is introduced first, and then the measurement method for free velocities of machineries is given. A method for transferring test bed datum to ship datum of machinery force characteristics is discussed and applied to deal with a practical problem, in which the numerical simulation is used for predicting admittance of ship mounting seat absenting reality. Experimental results show that the proposed method is valid.

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Bregant, Luigi, Flavia D'Agostin, and Martina Lorenzino. "Are on board comfort classes noise and vibration levels really suitable?" INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 5 (August 1, 2021): 1206–14. http://dx.doi.org/10.3397/in-2021-1777.

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In shipbuilding industry, comfort is a relevant issue both for crew members and passengers. A comfortable environment enables crew members to perform accurately their tasks and it is an effective factor contributing to the satisfaction of passengers. Noise and vibration, as environmental parameters, play an important role in subjects' comfort. Naval Classification Societies established series of noise/vibration comfort level criteria, which, however, did not take into account some aspects: 1) noise/vibration recordings are carried out during time periods shorter than the exposure time of passengers; 2) the subjective mood is not investigated. In the present study, we studied comfort perception by measuring heart rate variability and mood. We exposed participants to four levels of acoustic noise [from 45 to 55 dB(A)] and three levels of vibration (1.5, 1.8, 2 mm/s) inside a full-scale mock-up of a cruise ship cabin. We found that the increase of noise/vibration intensity determines an increase of heart rate variability and negative mood. However, changes in comfort responses did not occur for the noise/vibration comfort thresholds identified by the Classification Societies. Our results evidence the importance to include psychophysiological measure of comfort when defining comfort criteria on board.

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Gerasidi, V. V., and A. V. Lisachenko. "Analyzing vibration parameters of a modern high-speed engine during operation." Journal of Physics: Conference Series 2061, no. 1 (October 1, 2021): 012056. http://dx.doi.org/10.1088/1742-6596/2061/1/012056.

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Abstract The paper presents results of experimental research into vibration parameters of a modern electronic control-enabled main high-speed engine, Caterpillar CAT 3516B as obtained during a running trial of a sea tug. CAT 3500 series Caterpillar high-speed engines are extensively used in sea tugs; there are about 40 units installed in vessels operating in the Azov and Black Sea region. The research technique involved measurement of vibration displacement, vibration velocity, vibration acceleration at an engine and its turbocharger components. The conducted experimental research has shown that in order to evaluate the technical state of an engine, it is necessary to measure vibration displacement and vibration velocity in a frequency range from 1 to 1000 Hz at 0.1 Hz intervals. For turbochargers, the vibration acceleration shall be measured in a frequency range from 1 to 15000 Hz at 1 Hz intervals. The results of the experimental research allowed determining necessary conditions for measurement of vibration parameters of Caterpillar CAT-3500 series modern high-speed engines commonly used in sea tugs. The experimental research into vessel installations by in-place diagnostics at operating sea-going vessels forms a foundation of an autonomous ship control system.

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Guo, Jun, Mei-ting Wang, You-wei Kang, Yin Zhang, and Chen-xu Gu. "Prediction of Ship Cabin Noise Based on RBF Neural Network." Mathematical Problems in Engineering 2019 (April 14, 2019): 1–21. http://dx.doi.org/10.1155/2019/2781437.

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Prediction of cabin noise for new types of ships and offshore platforms, based on measurement or simulation databases, is a common problem that needs a solution at the beginning of the design process. In this paper, we explore the use of a radial basis function (RBF) neural network to study this problem. Within the framework of the RBF network, we implement and compare several algorithms to devise a fast and precise cabin noise prediction model. We select a combination of algorithms after training the RBF with noise measurement samples. The results show that the RBF neural network trained using the DE algorithm has better prediction accuracy, generalization, and robustness than the others. Our work provides a new method for preliminary noise assessment during the schematic design phase and enables rapid analysis of vibration and noise control schemes for ships and offshore platforms.

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Jiao, Jialong, Huilong Ren, Shuzheng Sun, and Christiaan Adika Adenya. "Experimental Investigation of Wave-Induced Ship Hydroelastic Vibrations by Large-Scale Model Measurement in Coastal Waves." Shock and Vibration 2016 (2016): 1–14. http://dx.doi.org/10.1155/2016/9296783.

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Ship hydroelastic vibration is an issue involving mutual interactions among inertial, hydrodynamic, and elastic forces. The conventional laboratory tests for wave-induced hydroelastic vibrations of ships are performed in tank conditions. An alternative approach to the conventional laboratory basin measurement, proposed in this paper, is to perform tests by large-scale model measurement in real sea waves. In order to perform this kind of novel experimental measurement, a large-scale free running model and the experiment scheme are proposed and introduced. The proposed testing methodology is quite general and applicable to a wide range of ship hydrodynamic experimental research. The testing procedure is presented by illustrating a 5-hour voyage trial of the large-scale model carried out at Huludao harbor of China in August 2015. Hammer tests were performed to identify the natural frequencies of the ship model at the beginning of the tests. Then a series of tests under different sailing conditions were carried out to investigate the vibrational characteristics of the model. As a postvoyage analysis, load, pressure, acceleration, and motion responses of the model are studied with respect to different time durations based on the measured data.

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KAWAMURA, Yoshiaki, Kuniaki SHOJI, Kiyokazu MINAMI, and Junzoh SETO. "A Study on the Working Environment on Board Ship by Finger Pulse Measurement." Journal of Japan Institute of Navigation 104 (2001): 243–49. http://dx.doi.org/10.9749/jin.104.243.

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Masnicki, Romuald, Janusz Mindykowski, and Przemyslaw Grala. "Towards Safety Improvement of Measurement and Control Signals Transmission in Marine Environment." Sensors 20, no. 6 (March 17, 2020): 1668. http://dx.doi.org/10.3390/s20061668.

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This paper is dedicated to some aspects of maritime on-board safety improvement. The contribution of this article is a proposal to extend wireless communication on the ship, supported by examples of solutions that have not previously been used on board. Analyzed aspects concern the measurement and control signal transmission in hostile marine environment. A problem to solve is formulated, how to reduce a negative impact of this environment on effectiveness and reliability of maritime on board communication. The proposed ways for solving a problem under consideration cover recommendations concerning some aspects of ship construction and implementation of wireless sensor network. The main topic faced by the paper is concentrated on case study-based ZigBee as well as WiFi networks implementation in the area of the acquisition of data from sensors and measuring transducers connected to the terminal network. The exemplary implementation of ZigBee network, elaborated in Gdynia Maritime University is related, firstly, to the configuration of a simple wireless measurement and control channel, and secondly, to wireless communication channel supported by autonomously working microprocessor measurement and control system. WiFi networks were also tested in the same area of application. Finally, some concluding remarks are formulated.

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Zhu, Chenyang, Tomaso Gaggero, Nicholas C. Makris, and Purnima Ratilal. "Underwater Sound Characteristics of a Ship with Controllable Pitch Propeller." Journal of Marine Science and Engineering 10, no. 3 (February 25, 2022): 328. http://dx.doi.org/10.3390/jmse10030328.

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The time-dependent spectral characteristics of underwater sound radiated by an ocean vessel has complex dependencies on ship machinery, propeller dynamics, hydrodynamics of ship exhaust and motion, as well as ship board activities. Here the underwater sound radiated by a ship equipped with a controllable pitch propeller (CPP) is analyzed and quantified via its (i) power spectral density for signal energetics, (ii) temporal coherence for machinery tonal sound, and (iii) spectral coherence for propeller amplitude-modulated cavitation noise. Frequency-modulated (FM) tonal signals are also characterized in terms of their frequency variations. These characteristics are compared for different propeller pitch ratios ranging from 20% to 82% at fixed propeller revolutions per minute (RPM). The efficacy and robustness of ship parameter estimation at different pitches are discussed. Finally, analysis of one special measurement is provided, when ship changes speed, propeller pitch and RPM over the duration of the measurement. The 50% pitch is found to be a crucial point for this ship about which tonal characteristics of its underwater radiated sound attain their peak values, while broadband sound and associated spectral coherences are at a minimum. The findings here elucidate the effects of pitch variation on underwater sound radiated by ships with controllable pitch propellers and has applications in ship design and underwater noise mitigation.

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Arevalo Gomez, Roger. "Measurement and analysis of vibrations - evaluation of the criteria of acceptance ISO Standard 10816-6." Ciencia y tecnología de buques 13, no. 26 (January 30, 2020): 39–44. http://dx.doi.org/10.25043/19098642.196.

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During the reception and / or delivery tests of a ship, vibration measurement and analysis is made to the propulsion line in order to evaluate and predict the condition of the machinery. The values taken during the measurement of the vibrations are evaluated with the acceptance criteria provided by the standards. International Standard ISO 10816-6 (1995) focuses on reciprocating machinery with power of greater than 100kW, is used by both analysts and manufacturers of propulsion machinery for ships. Through this work, we intend to evaluate the acceptance criteria of this norm in boats smaller than 100 meters. At the end of this work it is concluded that the standard must be updated, indicating and differentiating the acceptance criteria for machinery taking into account its type of anchorage to the structure (flexible or rigid), boats with length less than or greater than 100 meters and the Ship building material (Aluminum, Steel or Composite material).

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Hou, Lanlan, and Shuqian Cao. "Evaluation Method for Vibration Measurement on Casing in Aeroengine: Theoretical Analysis and Experimental Study." Shock and Vibration 2019 (March 14, 2019): 1–15. http://dx.doi.org/10.1155/2019/1648709.

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The vibration measurement location is the basis for effective monitoring of aeroengine vibration conditions. Measurement locations need to reflect the vibration of the rotor sufficiently, while complex structures of the aeroengine bring many excitation sources. This paper presents an evaluation methodology for vibration measurement on casing in the aeroengine. A number of indexes are defined to quantify and characterize the vibration measurement ability of main measurement locations on casing for rotor vibration. A dynamic model of a dual-rotor-casing system is established according to the support structure of a certain type of aeroengine. By means of the introduced evaluation method, the vibration relation between rotors and the main vibration measurement sections is analyzed. Response characteristics and performance orders of measurement sections are given. The rationality of theoretical results is sound verified by experiments on a designed pneumatic-driven double-rotor-casing test bench. The best measured vibration section is consistent with the actual on-board vibration section of the engine, which further demonstrates the effectiveness of the evaluation method. The research results can provide a basis for the selection and optimization of vibration measurement locations and fault diagnosis in the aeroengine. Furthermore, the application of this method is not limited to aeroengine vibration analysis and sensor measurement location optimization, but will be useful for vibration analysis of other rotating machinery.

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Murawski, Lech. "Influence of the Numerical Modelling Methods on Dispersions and Errors of Analysis Results of Ship Hull and Deckhouse Vibrations." Journal of KONBiN 52, no. 4 (December 1, 2022): 207–22. http://dx.doi.org/10.2478/jok-2022-0051.

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Abstract Ships’ (especially containers) vibrations significantly impact navigation safety. The presented analyses aims to identify the main forces exciting the ship’s superstructure and hull vibrations, test their influence on vibration levels, and verify the assumptions of the computational methodology. Two container ships were analysed. The influence of different modeling methods on the obtained calculation results was investigated. The impact of various operating parameters on the vibration level was also analysed. The numerical analyses results are compared with some empirical formulas. As a result, the calculation confidence level was estimated. The calculation results have been verified by comparison with measurement tests carried out on the real ship.

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Núñez, José, Pedro Orgeira-Crespo, Carlos Ulloa, and Inés García-Tuñón. "Analysis of the operating conditions for UAV-based on-board antenna radiation pattern measurement systems." PLOS ONE 16, no. 2 (February 3, 2021): e0245004. http://dx.doi.org/10.1371/journal.pone.0245004.

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Communications, navigation, and other related systems need to have a well-defined antenna radiation pattern. In onboard vessel systems, the radiation pattern can be much different than the one obtained for an isolated antenna (because of the vessel’s structure and other nearby radiating systems interference). Finding out the onboard antenna’s radiation pattern is a well-known problem for any shipbuilder/owner. The conventional method consists of measuring radiation patterns from a fixed antenna on the coast while the ship is navigating in circles. Recent electronic systems in the market now allow for an alternative method: keeping the ship static while an unmanned aerial vehicle (UAV) circles it, measuring the antenna’s transmitted power. This research paper examines the airspace volume and optimal flight path of an off-the-shelf UAV system for measuring the onboard antenna’s radiation pattern in the presence of physical constraints such as the vessel’s dimensions, safety zone, distance to base, Fresnel’s and multipath distances, and considering the loss due to polarization decoupling between the antenna under test and UAV’s antenna.

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Miao, Hui, Guang Lei Song, and Qiang Liu. "Micro-Vibration Analysis and Measurement on High Resolution Remote Sensing Satellites." Applied Mechanics and Materials 232 (November 2012): 432–36. http://dx.doi.org/10.4028/www.scientific.net/amm.232.432.

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Because micro-vibration environment of the high resolution remote sensing satellite makes great influence on image quality, it is necessary to design micro-vibration measurement equipment to accurately measure the micro-vibration parameters which impact the CCD imaging quality. The paper proposes a set of template to design the parameters of the micro-vibration on board. Starting from the change of CCD modulation transfer function (MTF) due to the micro-vibration, we can build the model, analyze the relationship of the CCD MTF and the frequency and the amplitude, and then we can determine the minimum of the angular displacement and the angular velocity. Finally design and conclude a set of logical, realizable and optimal template, which can afford facilities for the design on the parameters of measuring micro-vibration on the other high resolution remote sensing satellites.

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El-Safoury, Mahmoud, Miguel Dufner, Christian Weber, Katrin Schmitt, Hans-Fridtjof Pernau, Bert Willing, and Jürgen Wöllenstein. "On-Board Monitoring of SO2 Ship Emissions Using Resonant Photoacoustic Gas Detection in the UV Range." Sensors 21, no. 13 (June 29, 2021): 4468. http://dx.doi.org/10.3390/s21134468.

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A photoacoustic gas detector for SO2 was developed for ship exhaust gas emission monitoring. The basic measurement setup is based on the absorption of electromagnetic radiation of SO2 at 285 nm wavelength. A commercially available ultraviolet (UV) light-emitting diode (LED) is used as the light source and a micro-electro-mechanical system (MEMS) microphone as the detector. In order to achieve the required detection limits in marine applications, a measuring cell which allows an acoustically resonant amplification of the photoacoustic signal was developed and characterized. A limit of detection of 1 ppm was achieved in lab conditions during continuous gas flow. Long-term measurements on a container ship demonstrated the application relevance of the developed system.

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Jeong, Hongseok, Jeung-Hoon Lee, Yong-Hyun Kim, and Hanshin Seol. "Estimation of the Noise Source Level of a Commercial Ship Using On-Board Pressure Sensors." Applied Sciences 11, no. 3 (January 29, 2021): 1243. http://dx.doi.org/10.3390/app11031243.

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The dominant underwater noise source of a ship is known to be propeller cavitation. Recently, attempts have been made to quantify the source strength using on-board pressure sensors near the propeller, as this has advantages over conventional noise measurement. In this study, a beamforming method was used to estimate the source strength of a cavitating propeller. The method was validated against a model-scale measurement in a cavitation tunnel, which showed good agreement between the measured and estimated source levels. The method was also applied to a full-scale measurement, in which the source level was measured using an external hydrophone array. The estimated source level using the hull pressure sensors showed good agreement with the measured one above 400 Hz, which shows potential for noise monitoring using on-board sensors. A parametric study was carried out to check the practicality of the method. From the results, it was shown that a sufficient recording time is required to obtain a consistent level at high frequencies. Changing the frequency resolution had little effect on the result, as long as enough data were provided for the one-third octave band conversion. The number of sensors affected the mid- to low-frequency data.

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Yunsheng, AN, Chaoming Huang, Zhanhua Wu, Qingtao Li, Jie Li, Kexin Sheng, Wenhan Hao, and Shuangyin Chen. "A relative torsional vibration monitoring method for intelligent ships and associated error analysis." Insight - Non-Destructive Testing and Condition Monitoring 64, no. 5 (May 1, 2022): 285–94. http://dx.doi.org/10.1784/insi.2022.64.5.285.

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In this era of rapidly developing transport technology, shipping accounts for two thirds of the total international trade and transport industry. Nowadays, 'ship intelligence' is an important avenue to pursue in the development of the shipping industry and it requires ships and their working machinery to undergo real-time and high-precision inspection and diagnoses of their operational state. This paper develops a simple method for monitoring relative torsional vibration using multiple measuring points, which is suitable for the monitoring of intelligent ship rotating machinery. A proof-ofprinciple prototype is also designed to verify whether this calculational method can achieve clearer and more accurate physical significance and engineering practicability compared with the traditional single-point measuring method. According to the test results, under the condition of 100 pulses per revolution and at a speed of less than 3000 r/min, the relative error of speed measurement of the proof-of-principle prototype is within ±0.011%, which is close to the theoretical maximum accuracy of a 54 MHz sampling rate. The measurement result for the relative torsional angle shows that the maximum error is less than 0.17 mrad, the relative error is less than 1.75% and the maximum error in the amplitudes of the first and third harmonics is 9 mdeg. These accuracies are higher than those of the traditional method, which are 2.62% and 12 mdeg, respectively, in this study. Under the condition of speed fluctuations and rolling vibration, distortion occurs in the time-domain and frequency-domain torsional angle curves when the single-point measuring method is adopted. With the multi-point measuring method, much more accurate measurement values of the torsional angle are acquired compared with the single-point measuring method and accurate time-domain and frequency-domain curves are also obtained. Finally, the health status of the torsional angle is evaluated using an intelligent dynamic alarm system with a torsional vibration threshold, which has a better evaluation effect in line with the engineering practice and specification requirements. Therefore, this simple multi-point relative torsional vibration inspection method has universal applicability and wide application value.

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Liang, Bing Nan, Hong Liang Yu, and Yu Chao Song. "Analysis of Damping Performance for Cabin Deck Covered with Floating Floor Coverings." Advanced Materials Research 610-613 (December 2012): 2566–70. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.2566.

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Floating floor coverings are widely applied in ship structures. With regard to the laminated composite shells made up of floating floor coverings and cabin deck and based on ANSYS system, a dynamics analysis on structures of three different kinds of floating floors is performed using FEM built upon laminated shell elements. The influence of rockwool board in terms of thickness, density and elastic modulus on structure dynamic characteristics is discussed. The performances of vibration control of three different floating floor structures are compared. The FEM performs well in analyzing and calculating the vibration control characteristics of structures, the results of which offer certain reference to the design and research on cabin deck covered with floating floor coverings.

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Chandra Ariesta, Rizky, Achmad Zubaydi, Abdi Ismail, and Tuswan Tuswan. "Identification of Damage Size Effect of Natural Frequency on Sandwich Material using Free Vibration Analysis." Naše more 69, no. 1 (March 2022): 1–8. http://dx.doi.org/10.17818/nm/2022/1.1.

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One of the most innovative developments in the field of advanced materials is sandwich materials. Sandwich material applications need standard requirements to be applied to marine structures, especially on ship construction. Sandwich material research is conducted on a laboratory scale to obtain the appropriate material composition in its development. In the process of developing this material, the material can be damaged. Most damage occurs in the core material, which results in difficulties in the identification process. This study compares damage identification methods based on free vibration analysis on the side sandwich plate of the ship’s hull. Damage-based identification is carried out to determine the response of vibration to the damage that occurs. Moreover, the method in this research uses a numerical approach and experimental vibration measurement. Numerical modelling is used to determine the appropriate boundary conditions and is shifted in experimental measurement. Damage modelling assumes that the material experiences core failure with a numerous variation model. Quantification of damage on the core correlates with natural frequency reduction due to a decrease in the stiffness of the sandwich material. Hence, the difference in the deviation value is used to determine the accuracy of damage identification.

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Singh, S. Paul, K. Saha, J. Singh, and A. P. S. Sandhu. "Measurement and Analysis of Vibration and Temperature Levels in Global Intermodal Container Shipments on Truck, Rail and Ship." Packaging Technology and Science 25, no. 3 (October 10, 2011): 149–60. http://dx.doi.org/10.1002/pts.968.

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Murai, Koji, Shin‐Ichi Wakida, Keiichi Fukushi, Yuji Hayashi, and Laurie C. Stone. "Enhancing maritime education and training." Interactive Technology and Smart Education 6, no. 4 (November 20, 2009): 293–302. http://dx.doi.org/10.1108/17415650911009272.

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PurposeThe purpose of this paper is to propose that the measurement of salivary amylase activity is an effective index to evaluate the stress of a ship navigator for safe navigation training and education.Design/methodology/approachEvaluation comes from the simulator and actual on‐board experiments. The subjects are real captains who have unlimited licenses and cadets who are senior students at Kobe University, navigation course. Stress is evaluated for several situations where a ship navigator makes a lot of decisions, in this case in a narrow passage, entering a port and leaving a port.FindingsSalivary amylase activity occurs when a ship navigator makes a decision regarding ship handling and collision avoidance. By measuring salivary amylase activity when a student is under duress, cadets' ship‐handling training can be evaluated while onboard a vessel.Research limitations/implicationsFuture research will develop cross‐indices with the salivary amylase activity and other physiological indices (nasal temperature and heart rate variability (R‐R interval)), complementary to each other. The salivary amylase activity registers the stress quickly on the spot. Then the nasal temperature and R‐R interval registers the trend and the quick response to the stress (mental workload).Practical implicationsThe paper describes an effective index which is useful for evaluating a ship navigator's stress for safe navigation.Originality/valueShip navigator's skill and cadet's on‐board training have been evaluated according to performance and a questionnaire as a quantitative evaluation; moreover, stress is evaluated using salivary amylase activity.

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Motte, R. H., R. Fazal, M. Epshteyn, S. Calvert, and H. Wojdylak. "Design and Operation of a Computerized, On-Board, Weather Routeing System." Journal of Navigation 47, no. 1 (January 1994): 54–69. http://dx.doi.org/10.1017/s0373463300011139.

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Weather routeing of ships has taken roughly three chronological steps. Originally, seasonal climatological weather charts, bearing little resemblance to actual conditions, gave standard routes. This somewhat passive activity was superseded by the measurement and subsequent forecasting of atmospheric and oceanographic data. Weather routeing became more complex as telex and radio facsimile routeing messages could be regularly transmitted to the ship. This form of routeing is still operational; masters can obtain radio facsimile sea and pressure charts and perform their own routeing, or employ specialist organizations which transmit the relevant routeing advice.

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TANIGUCHI, Masanari, and Tasuku TAKAGI. "Application of Holographic Pattern Measuring System(HPMS) to Vibration Measurement of Printed Circuit Board Due to Shock and Vibration." Journal of Japan Institute for Interconnecting and Packaging Electronic Circuits 11, no. 3 (1996): 207–11. http://dx.doi.org/10.5104/jiep1995.11.207.

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Oh, Jong-Seok, Young-Min Han, Seung-Bok Choi, Vien-Quoc Nguyen, and Seok-Jun Moon. "Design of a one-chip board microcontrol unit for active vibration control of a naval ship mounting system." Smart Materials and Structures 21, no. 8 (July 20, 2012): 087001. http://dx.doi.org/10.1088/0964-1726/21/8/087001.

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Villarroel, Adrian, Grover Zurita, and Romeo Velarde. "Development of a Low-Cost Vibration Measurement System for Industrial Applications." Machines 7, no. 1 (February 1, 2019): 12. http://dx.doi.org/10.3390/machines7010012.

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Vibration-Based Condition Monitoring (VBCM) provides essential data to perform Condition-Based Maintenance for efficient, optimal, reliable, and safe industrial machinery operation. However, equipment required to perform VBCM is often relatively expensive. In this paper, a low-cost vibration measurement system based on a microcontroller platform is presented. The FRDM K64F development board was selected as the most suitable for fulfilling the system requirements. The industrial environment is highly contaminated by noise (electromagnetic, combustion, airborne, sound borne, and mechanical noise). Developing a proper antialiasing filter to reduce industrial noise is a real challenge. In order to validate the developed system, evaluations of frequency response and phase noise were carried out. Additionally, vibration measurements were recorded in the industry under different running conditions and machine configurations. Data were collected simultaneously using a standard reference system and the low-cost vibration measurement system. Results were processed using Fast Fourier Transform and Welch’s method. Finally, a low-cost vibration measurement system was successfully created. The validation process demonstrates the robustness, reliability, and accuracy of this research approach. Results confirm a correlation between signal frequency spectrum obtained using both measurement systems. We also introduce new guidelines for practical data storage, communications, and validation process for vibration measurements.

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Szeleziński, Adam, Adam Muc, Lech Murawski, Marcin Kluczyk, and Tomasz Muchowski. "Application of Laser Vibrometry to Assess Defects in Ship Hull’s Welded Joints’ Technical Condition." Sensors 21, no. 3 (January 29, 2021): 895. http://dx.doi.org/10.3390/s21030895.

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The paper presents the measurement process and test results for six thin-walled plates with different dynamic characteristics caused by different defects of welded joints. The tests were carried out using non-destructive testing (NDT). The authors made an attempt to determine the validity of the use and degree of effectiveness of the tests based on laser vibrometry in detecting defects in welded joints. The tests of welded plates were carried out using displacement laser sensors and piezoelectric accelerometers, while the source of vibration extortion was a modal hammer. In the adopted measurement methodology, the application of accelerometers was to obtain the reference data, which allowed for comparison with the measurement data obtained from the laser vibrometer. The analysis of the obtained measurement data, in the fields of time and frequency, made it possible to verify the correctness of the data obtained by means of laser vibrometry and to determine the requirements which are necessary for the correct performance of NDT tests and in the future structural health monitoring (SHM) system of welded joints with the use of a laser vibrometer. The mathematical model developed in the MSC software Pastran-Nastran was also used in the work. The model was developed for the purpose of mutual verification of the measurement and calculation tests. At the present stage of work, it can be stated that the results obtained by laser vibrometry methods should be treated as a supplement to the research conducted with traditional piezoelectric accelerometers. In certain situations, they can be used as an alternative to accelerometers, due to the fact that laser sensors do not require direct contact with the examined object. Where the object under test may be in a strong electromagnetic field, optical sensors are better suited than contact sensors.

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Orlowitz, Esben, and Anders Brandt. "Operational Modal Analysis for Dynamic Characterization of a Ro-Lo Ship." Journal of Ship Research 58, no. 04 (December 1, 2014): 216–24. http://dx.doi.org/10.5957/jsr.2014.58.4.216.

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The dynamic characteristics of ship structures are becoming more important as the flexibility of modern ships increases, for example, to predict reliable design life. This requires an accurate dynamic model of the structure, which, because of complex vibration environment and complex boundary conditions, can only be validated by measurements. In the present paper the use of operational modal analysis (OMA) for dynamic characterization of a ship structure based on experimental data, from a full-scale measurement of a 210-m long Ro-Lo ship during sea trial, is presented. The measurements contain three different data sets obtained under different operating conditions of the ship: 10 knots cruising speed, 18 knots cruising speed, and at anchor. Natural frequencies, modal damping ratios, and mode shapes have been successfully estimated for the first 10 global modes. Damping ratios for the current ship were found within the range 0.9%–1.9% and natural frequencies were found to range from 0.8 to 4.1 Hz for the first 10 global modes of the ship at design speed (18 knots). The three different operating conditions showed, in addition, a speed dependency of the natural frequencies and damping ratios. The natural frequencies were found to be lower for the 18-knots condition compared with the two other conditions, most significantly for the vertical bending modes. Also, for the vertical bending modes, the damping ratios increased by 28%–288% when the speed increased from 10 to 18 knots. Other modes were not found to have the same strong speed dependency.

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Futatsudera, Akio, Miyazono Daiki, Yoshiyuki Moriuchi, Hajime Yamaguchi, Takafumi Kawamura, and Masaru Miyanaga. "Influence of the ship hull and superstructure on the on board measurement of wind and turbulence." Journal of the Society of Naval Architects of Japan 2002, no. 192 (2002): 71–80. http://dx.doi.org/10.2534/jjasnaoe1968.2002.71.

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Kazymyrenko, Y., and N. Lebedieva. "THEORETICAL PREREQUISITES FOR OPERATION OF STRUCTURES WITH METAL-GLASS PROTECTIVE COATINGS ON BOARD A VESSEL IN VIBRATION ENVIRONMENT." Scientific Bulletin Kherson State Maritime Academy 1, no. 22 (2020): 175–85. http://dx.doi.org/10.33815/2313-4763.2020.1.22.175-185.

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The article is devoted to looking for a solution for the scientific and technical issue of reducing vibrations on vessels. It is considered to be achieved with the application of the vibration-absorbing composite coatings. The purpose of the work is to theoretically substantiate the possibility of operation of structures with metal-glass coatings taking into consideration the vibration environment of a vessel. The formulation of the research includes the discovery of the solution for the micromechanics issue set up on the model of a two-layer plate St3 ‒ metal-glass coatings, taking into account their structural features, and experimental tensile tests. The influence of the polydisperse structure of coatings on the mechanisms of absorption of elastic-plastic waves of dynamic oscillations has been analyzed with the help of the analytical description of microdisplacement deformations. The influence of morphology and volume content of glass fillers, specifically hollow glass microspheres, powders of sodium silicate and lead-containing glass on the vibration coefficient, strength limit and yield strength has been investigated. Calculations have shown the feasibility of using metal-glass coatings in conditions of vessel vibration, which is due to the absorption of energy by glass inclusions of spherical and angular shape. It has been experimentally proven that coated plates are slightly inferior in tensile strength to samples with St3; the destruction of coatings occurs between glass inclusions. The obtained results have scientific and practical significance for the design of ship structures using composite materials and coatings.

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Bonisławski, Michał, Marcin HOŁUB, Tadeusz Borkowski, and Przemysław Kowalak. "A Novel Telemetry System for Real Time, Ship Main Propulsion Power Measurement." Sensors 19, no. 21 (November 2, 2019): 4771. http://dx.doi.org/10.3390/s19214771.

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Modern ships are required to increase the energy efficiency and minimize fuel consumption. This paper presents the construction, main properties and exemplary measurement results of a novel system intended for main shaft power monitoring. The telemetry system consists of the stationary part, responsible for wireless supply energy transfer to the rotating part. Additional functions of the stationery unit include radio-based, bidirectional communication with the rotating, microcontroller-based unit, and Modbus-based communication with the graphical user interface. The non-stationary (rotating) part receives the necessary energy using the wireless transmission and performs the torque and speed measurement using strain gauge and a special setup of the wireless energy system. A novel system of flexible printed circuit board (PCB) coils is used for wireless energy transmission and increases the flexibility of the device while minimizing the necessary size, weight, and costs of the setup. The microcontroller unit used for measurements allows proper sampling of highly dynamic signals and can be used for advanced drive system diagnostics or as a typical power monitoring device. Such unit was installed on a ferry and operation was monitored for several sea trips. Main results depict characteristic power data referenced to vessel speed and specific fuel oil consumption (SFOC). Proposed system construction allows to reduce system costs and provides stable readings for long period of operation.

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Taniguchi, Masanari, Tasuku Takagi, and Isamu Akasaki. "Vibration Pattern Measurement of Miniature Electromagnetic Relay Mounted Printed Circuit Board by Stroboscopic Holography." IEEJ Transactions on Electronics, Information and Systems 113, no. 12 (1993): 1107–13. http://dx.doi.org/10.1541/ieejeiss1987.113.12_1107.

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Argote Guzmán, Ronald Yesid. "Implementation of Confirmation of Methods in Measurement Equipment Calibration as a Normalized Strategy to Ensure the Quality of Measurements Made in the Construction, Repair, and Modernization of Ships and Naval Artifacts in COTECMAR." Ciencia y tecnología de buques 8, no. 16 (January 23, 2015): 29. http://dx.doi.org/10.25043/19098642.109.

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The naval, maritime and riverine industry is one of the sectors, which has greater contribution to theworld economy, hence, quality assurance is one of the main priorities in all maritime activities, especiallythe ones related to ship building. The monitoring of different variables that allows good performance of aship involves assessing equipment in order to assure data taking with greater precision and accuracy; thisis where metrology takes place as a science for studying inherent problems to measurement data collection,focusing on equipment calibration. The grade of uncertainty produced by data taking procedures of eachequipment on board of ship depend on techniques and results control specifications, which are knownas Methods Confirmation. The metrology laboratory at COTECMAR applied this method to guaranteequality by estimating validity and reliability of the obtained results through different measuringequipment related to ship construction and repairing.

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Chang, Hai Juan, Jian Jun Zhang, and Shu Zhu. "Application of Clustering Analysis Algorithm in Sorting Stochastic Vibration Environment Measured Data." Applied Mechanics and Materials 52-54 (March 2011): 1433–37. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.1433.

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Environment measurement technology of aircraft platform is the foundation of environment prediction, while inductive technology of environment measurement data is the support of environment prediction. To analysis how the vibration of different channel and in different position affect the equipment on board, it’s awfully needed to classify the vibration data of aircraft platform according to how was the aircraft flying and where was the sensor placed. However, the traditional method for categorizing gives the sort first, and then make certain if one sample belongs to this category, which is easy to withstand the influence of man-made factors. As it hard to fix the categories first for the vibration on aircraft platform, we put forward using clustering analysis into the categorizing of vibration measured data to eliminate the influence of man-made factors. This method is the improvement of the current inductive method for vibration environment measured data.

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Bogdanowicz, Artur, and Tomasz Kniaziewicz. "Marine Diesel Engine Exhaust Emissions Measured in Ship’s Dynamic Operating Conditions." Sensors 20, no. 22 (November 18, 2020): 6589. http://dx.doi.org/10.3390/s20226589.

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The paper presents the results of research on measuring the emissions from marine diesel engines in dynamic states. The problem is as follows: How to measure emissions of the composition of exhaust gases on board a ship, without direct measurement of fuel consumption and an air flow to marine diesel engine, during maneuvering the ship in the port area. The authors proposed a measurement methodology using an exhaust gas analyzer with simultaneous recording of the load indicator, engine speed, inclinometer, and Global Positioning System (GPS) data. Fuel consumption was calculated based on mean indicated pressure (MIP) tests. Recorded data were processed in the LabView systems engineering software. A simple neural network algorithm was used to model the concentrations of ingredients contained in engine exhaust gases during dynamic states. Using the recorded data, it is possible to calculate the emissions of the composition of exhaust gases from the marine diesel engine and calculate the route emissions of the tested vessel.

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Qiu, Zhi-cheng, Tao-xian Wang, and Xian-min Zhang. "Sliding mode predictive vibration control of a piezoelectric flexible plate." Journal of Intelligent Material Systems and Structures 32, no. 1 (August 20, 2020): 65–81. http://dx.doi.org/10.1177/1045389x20948597.

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A non-contact vibration measurement and control system for a piezoelectric-patched flexible cantilever plate is presented, using laser displacement sensors. Two laser displacement sensors are utilized to detect the deflection information of the two corners of the end of the flexible board, due to its high measurement accuracy for the small amplitude residual vibration. The vibrations of the first bending and torsional mode of the flexible plate can be extracted from the combined information. To achieve a desirable performance for the active vibration control, a kind of sliding mode predictive control strategy is developed to damp the vibration quickly. Simulation of the controller on bending and torsional vibration is conducted, based on the model built with finite element method. Furthermore, a piezoelectric flexible cantilever plate experimental setup is constructed. Experiments are conducted. The results of simulation and experiment both demonstrate the effectiveness of presented control scheme, compared with proportional and derivative control; the sliding mode predictive control can attenuate the vibration more quickly, particularly for the small amplitude residual vibration.

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Ibadullaev, Adel Damirovich, Konstantin Olegovich Sibryaev, and Aleksandr Sergeevich Stukalov. "Analyzing operability of silicone dampers of torsional vibrations in marine internal combustion engines based on results of Testing Center Marine Technology Service." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2022, no. 3 (August 23, 2022): 60–68. http://dx.doi.org/10.24143/2073-1574-2022-3-60-68.

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The article presents the analysis results of changes in the operability of silicone dampers of torsional vibrations of marine diesel engines on the basis of practical measurements carried out by the Testing Center Marine Technology Service under the Astrakhan State Technical University (TC MTS). TC MTS is accredited by the Russian classification society - the Russian Maritime Register of Shipping (RMRS) in the field of calculation and measurement of torsional vibrations. During its functioning (2001 – to date) the TC MTS has conducted torsiographing procedures of the machine-propulsion systems (MPS) of more than 200 vessels. The large amount of data obtained makes it possible to assess the dynamics of changes in the parameters of torsional vibrations, including amplitude and frequency, according to the results of periodic torsiographing the ship MPS. A change in the technical condition of the torsional vibration damper (a decrease in the efficiency of its operation) and the lack of its constant monitoring lead to the increasing stresses in the ship shaft line and, as a result, to a growing risk of its breakdown, which confirms the urgency of the study. There are given the images as real examples of ship operation failure: Aratere ship shaft fracture, damper mass wedging due to silicone fluid leakage, silicone fluid viscosity increasing to suspension state due to wear products, wear of silicone damper flyweight surfaces, silicone damper body wear. The Hasse & Wrede damper cap fastening with bolts is illustrated.

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Journal articles on the topic 'Vibration measurement on board ship'

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