Use of torsional vibration monitoring systems to improve the reliability of marine propulsion systems

Torsional vibrations, despite all the design and technical solutions used, remain the cause of dangerous accidents of ship engine-propulsion systems (EPS). The use of dampers reduces the risk of torsional vibrations, but the dampers themselves must be periodically subjected to a technical condition assessment procedure to check the effectiveness of their work and the absence of structural damage. Such procedures are carried out every 10000 — 15000 h and during the inter-inspection period there is a risk of an accident in the event of a damper failure. The study proposes to carry out continuous (or with short breaks) monitoring of torsional vibrations and move on to assessing the actual technical condition of dampers instead of that according to regulations. The purpose of the study is to increase the safety of navigation and reduce the risks of fatigue failures of the elements of the EPS due to the development of dangerous torsional vibrations by implementing systems for monitoring them. The study has a practical application and is ultimately aimed at a comparative analysis of data obtained by short-term measurements of torsional vibrations using traditional systems and long-term measurements using the experimental model of the torsional vibration monitoring system developed by the authors. As objects for research, the laboratory stand of the MTS testing center of the Federal State Budgetary Educational Institution "ASTU", the marine bunkering ship of the "Turcas" project and the sea tug of the Damen ASD Tug 3110 project have been used. The results of the study show that the monitoring of torsional vibrations allows us to obtain more complete information on the development of torsional vibrations at non-resonant frequencies, at transient modes of starting and stopping the ME, compared with the information obtained with the traditional torsiography procedure. The introduction of torsional vibration monitoring systems, therefore, will improve the safety of navigation of ships and reduce the risks of accidents with EPS.

1. Efremov L.V. Teoriya i praktika issledovany krutilnykh kolebany silovykh ustanovok s primeneniem kompyuternykh tekhnology [Theory and practice of research of torsional vibrations of power plants using computer technology] — St. Petersburg, Nauka Publ, 2007, 276 p.

2. Vikulov S.V. Diagnostika kolenchatogo vala sudovogo dizelya po parametram krutilnykh kolebaniy [Diagnostics of the crankshaft of a marine diesel engine according to the parameters of torsional vibrations] // Polzunovskiy vestnik № 4/3, 2013, pp. 146 — 150.

3. Nguen Din Tyong. Uchet sluchaynykh faktorov pri raschete krutilnykh kolebany valoprovodov sudovykh dizelnykh ustanovok metodom glavnykh koordinat [Taking into account random factors in the calculation of torsional vibrations of the shaftlines of marine diesel installations by the method of main coordinates. Abstract of the dissertation for the degree of Candidate of Technical Sciences]. St. Petersburg, 2004. 24 p.

4. Feese T, Hill C. Guidelines for preventing torsional vibration problems in reciprocating machinery. Engineering Dynamics Incorporated, 2002. 48 p.

5. Dereszewski M. Test stand for monitoring of torsional vibration of engine's crankshaft by instantaneous angular speed measurement // Zeszyty naukowe akademii morskiej w gdyni, nr 96, grudzień 2016, pp. 15 — 23.

6. Astech Electronics Limited. Operating instructions, 2001, 20 p.

7. Pokusaev M.N., Sibryaev K.O., Gorbachev M.M. Rezultaty razrabotki i ispytaniya prototipa sistemy monitoringa krutilnykh kolebaniy sudovykh valoprovodov v ramkakh realizatsii nauchnogo granta "START-1" [Results of development and testing of a prototype system for monitoring torsional vibrations of ship shaft pipelines within the framework of the scientific grant "START-1"] // In the collection: 66th International Scientific Conference of Astrakhan State Technical University. Conference materials]. Astrakhan, 2022. pp. 466 — 468.

8. Revised Guidelines for Formal Safety Assessment (FSA) for use in the IMO rule-making Process. MSC MEPC.2/Circ.12/Rev.2. IMO, 2018, 71 p.

9. Rules for the Classification and Construction of Sea-Going Ships. Part VII. Machinery Installations. Russian Maritime Register of Shipping, St. Petersburg, 2023, 100 p. (In Russian)

10. Annexes to the Guidelines on Technical Supervision of Ships in Service. Russian Maritime Register of Shipping. St. Petersburg, 2023, 362 p. (In Russian)

11. Lebedev O.B. Dinamika vibratsionnykh vzaimodeystviy elementov ekspluatiruemoy sudovoy energeticheskoy ustanovki [Dynamics of vibration interactions of elements of the operated ship power plant. Dissertation for the degree of Candidate of Technical Sciences]. Novosibirsk, 2022. 185 p.

12. Glushkov S.P., Glushkov S.S, Kochergin V.I., Lebedev B.O. Analiz dinamicheskikh kharakteristik krutilno-kolebatelnykh sistem sudovykh energeticheskikh ustanovok [Analysis of dynamic characteristics of torsion-oscillatory systems of marine power plants] // Morskie intellektualnye tekhnologii [Marine intelligent technologies], 2 (40) vol. 2, 2018, pp. 59 — 66.

13. Glushkov S.P., Zhidkikh V.O. Vybor Veyvlet-obrazuyushchey funktsii dlya analiza dinamicheskikh kharakteristik signala dvigatelya vnutrennego sgoraniya [The choice of a wavelet-generating function for analyzing the dynamic characteristics of an internal combustion engine signal] // Bulletin of the Siberian State University of Railway Transport, 2017. № 1 (40), pp. 51 — 56.

14. Vikulov S.V. Metody postroeniya algoritmov diagnostirovaniya elementov sudovykh dizeley na osnove sistemnogo podkhoda [Methods of constructing algorithms for diagnosing elements of marine diesel engines based on a systematic approach]. Dissertation for the degree of Doctor of Technical Sciences. Novosibirsk. 2013, 312 p.