Application of Modal Analysis for the Vibrational Comfort Investigation on Board Ships: a Case Study

Abstract

The design of a ship is a process facilitated by different parallel departments. Specialists from various disciplines jointly work on a project, eventually covering the entire process. Though simultaneously, these disciplines are often subject to a hierarchy, either clearly defined or dictated by necessity. Within these branches, despite a growing interest in enhancing the comfort on board ships, noise and vibration design is among the most sacrificed. Compared to hydrodynamic or structural modifications, efforts devoted to improving vibrational comfort are generally slightly impactful and costly. Consequently, these improvements are often relegated to the final stages of the design procedure. The underestimation of noise and vibrational comfort design can generate serious, unexpected issues emerging only in the advanced phases of the ship’s life, and post-construction interventions are often needed. This case is exemplified in the current study, where the crew of the research vessel Mintis, a catamaran-type hull, reported discomfort in the navigation wheelhouse. A measurement campaign was set up to assess the complaints of the operating personnel regarding the high vibrational levels. Subsequent to the measurements, a numerical simulation, specifically comprising a modal analysis, was conducted to investigate the nature of the disturbance and distinguish the underlying mechanism at its origin. This paper meticulously presents and discusses the strategy undertaken to analyze and solve the vibrational problem encountered on board, with particular attention to the criteria and the modeling considerations adopted.

Keywords

Modal mass fraction / Modal shape / Vibration measurement / Suspended floor / Catamaran

References

[1] ABS. ABS guidelines SV. Guidance Notes on Ship Vibration. 2006

[2] Biot M, De Lorenzo F. Noise and vibrations on board cruise ships: are new standards effective?. 2^nd International Conference on Marine Research and Transportation ICMRT’ 07. 2007

[3] Boorsma A, Carden EP. Proulx T. Use of operational modal analysis in solving ship vibration issues. Modal Analysis Topics. 2011, New York, Springer: 281288Volume 3

[4] Carlton JS. Marine propellers and propulsion. 2018

[5] Chen D, Zi H, Li Y, Li X (2021) Low frequency ship vibration isolation using the band gap concept of sandwich plate-type elastic metastructures. Ocean Eng 235. https://doi.org/10.1016/j.oceaneng.2021.109460

[6] Cotaquispe A, Monteiro UA, Castro Brenno M, Gutierrez RH, Vaz LA. Operational modal analysis of a catamaran using a limited set of accelerometers. Sh Offshore Struct. 2023, 18: 669-677

[7] DeBord F, Hennessy W, McDonald J. Measurement and analysis of shipboard vibrations. Marine Technology and SNAME News. 1998, 35: 1-9

[8] Du Y, Sun L, Pang F, Li H, Gao C. Experimental research of hull vibration of a full-scale river icebreaker. J Mar Sci Appl. 2020, 19: 182-194

[9] Egusquiza E, Escaler X, Valero E, Coussirat M (2008) Vibration analysis and diagnostic in a catamaran vessel. Instrumentation Viewpoint, 56–57

[10] Hambric SA, Fahnline JB. Structural vibrations. 2016 chapter 2

[11] Iqbal J, Shifan Z. Modeling and simulation of ship structures using finite element method. International Journal of Industrial and Manufacturing Engineering. 2018, 12: 942-948

[12] ISO. ISO 6954: 1984 (E). Mechanical vibration and shock-Guidelines for the overall evaluation of vibration in merchant ships. Standard. 1984, Geneva, International Organization for Standardization

[13] ISO. ISO 20283-3: 2006. Mechanical vibration-Measurement of vibration on ships. Part 3: Pre–installation vibration measurement of shipboard equipment. Standard. 2006, Geneva, International Organization for Standardization

[14] ISO. ISO 20283-2: 2008. Mechanical vibration-Measurement of vibration on ships. Part 2: Measurement of structural vibration. Standard. 2008, Geneva, International Organization for Standardization

[15] ISO. ISO 20283-4: 2012. Mechanical vibration-Measurement of vibration on ships. Part 4: Measurement and evaluation of vibration of the ship propulsion machinery. Standard. 2012, Geneva, International Organization for Standardization

[16] ISO. ISO 20283-5: 2016. Mechanical vibration-Measurement of vibration on ships. Part 5: Guidelines for measurement, evaluation and reporting of vibration with regard to habitability on passenger and merchant ships. Standard. 2016, Geneva, International Organization for Standardization

[17] Liang P, Hong M, Wang Z. Experimental and numerical investigations on vibration characteristics of a loaded ship model. J Mar Sci Appl. 2015, 14: 234-243

[18] Liu B, Zhang H, Wang K, Wu J. Acoustic black hole lightweight superstructure with low-frequency broadband high-efficiency sound insulation mechanism and experimental study. Journal of Xi’an Jiaotong University. 2019, 53: 128-134

[19] LR. LR SVN Guidance Notes. Ship Vibration and Noise Guidance Notes. Guidelines. 2006

[20] Mitu DE, Memet F (2013) A point of view in study of noise level and vibrations on an ice breaking tug using time method and FFT analysis. Advances in Production, Automation and Transportation Systems, 28–32

[21] Moro L, Biot M, Brocco E, De Lorenzo F, Mendoza Vassallo PN. Hull vibration analysis of river boat. Proceedings of IDS2013-Amazonia. 2013

[22] Moro L, Brocco E, Badino A, Mendoza Vassallo PN, Clericuzio A, Biot M. Design procedure for the development of new floating floors to improve comfort on ships. Proceedings of PRADS2016. 2016

[23] MSC. MSC Nastran 2023.3. Dynamic Analysis User’s Guide. 2023

[24] Pais T, Moro L, Boote D, Biot M. Vibration analysis for the comfort assessment of superyachts. J Mar Sci Appl. 2017, 16: 323-333

[25] Pais T, Boote D, Vergassola G. Vibration analysis for the comfort assessment of a superyacht under hydrodynamic loads due to mechanical propulsion. Ocean Eng. 2018, 155: 310-323

[26] Savreux K, Crouzet S, Andreau C. Overview of comfort criteria for vibration assessment proposed by ISO 6954 and different classification societies. Ship Noise and Vibration Conference. 2007

[27] Sestan A, Vladimir N, Vulic N, Ljubenkov B. A study into resonant phenomena in the catamaran ferry propulsion system. Transactions of FAMENA. 2012, 36: 35-44

[28] Sun LP, Nie W, Zhang W. Analysis of structural dynamic characteristics of a high-speed light special catamaran. J Mar Sci Appl. 2006, 5: 1-5

[29] Tian W, Zhao T, Yang Z. Theoretical modelling and design of metamaterial stiffened plate for vibration suppression and supersonic flutter. Compos Struct. 2022, 282: 115010

[30] Umezaki K, Kenji M, Ohtaka K, Kagawa K. Vibration of container ship. Journal of the Society of Naval Architects of Japan. 1969, 126: 187-207

[31] Vergassola G, Pais T, Boote D. Low-frequency analysis of super yacht free vibrations. Ocean Eng. 2019, 176: 199-210

[32] Yucel A, Arpaci A. Free and forced vibration analyses of ship structures using the finite element method. J Mar Sci Technol. 2013, 18: 324-338

[33] Zou X, Jiang G, Ye L. Vibration response analysis of a new scientific research ship based on finite element modeling. J Mar Sci Appl. 2022, 21: 69-81

[34] Zou X, Li B, Ye L. Study on local vibration modal analysis of new scientific investigation ship based on finite element method. Proceedings MEMAT 2022. 2022

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