Estimation of permissible stresses due to the torsional vibration of crankshafts of internal combustion engines

Authors: L.V. Efremov,  M.Yu. Ivanov

Abstract

The article is an the attempt to show the possible ways of specifying the require-ments on the assessment of permissible stresses (PS) of total and resonance torsional vibrations of crankshafts of internal combustion engines (ICE), including those determined in accordance with the requirements of 8.2 Part VII "Machinery Istalltions" of the Rules for the Classification and Construction of Sea-Going Ships [1]. Back in the 1960s, as shown in reference [5] it was found that PS, as defined in these requirements at rated speed, in some cases, do not coincide with the results of their calculation by other experts using alternative methods, as well as with the data of internal combustion engines manufacturers (sometimes lowering them by up to 1,5 times). Recent research has made it possible to identify the cause of these contradictions and to propose, as an alternative, to specify the current requirements for permissible stesses depending on the crankshaft material tensile strength, its diameter and rotation speed. This method is based on cycle fatigue strength theory and complies with the requirements for permissible stresses, e.g., those specified in [2].

 

Keywords: crankshaft, torsional vibrations permissible stresses, Register rules, total, resonance, motor form, a restricted area

 

References

1. Rossijskij morskoj registr sudohodstva. Pravila klassifikacii i postrojki morskih sudov. Chast' VII. Mehanicheskie ustanovki [Russian Maritime Register of Shipping. Rules for the Classifi-cation and Construction of Sea-Going Ships. Prt VII. Machinery Installations.]. St. Petersburg, 2017.

2. Rossijskij Rechnoj Registr. T. 3 Pravila klassifikacii i postrojki sudov - chast' IV "Ehnergeticheskaja ustanovka i sistemy" [Russian River Register. Volume 3 Rules for the Classifica-tion and Construction of Ships - Part IV "Power Plant and Systems"]. Moscow, 2015.

3. Efremov L.V., Ivanov M.Ju. Analiz trebovanij RS po ocenke dopuskaemyh naprjazhenij ot krutil'nyh kolebanij kolenchatyh valov DVS [Analisys of the RS' requirements for estima-tion of permissible stresses due to torsional vibration of I.C.E. Cranckshafts] Nauchno-tehnicheskiy sbornik Rossijskogo Morskogo Registra Sudohodstva [Research Bulletin by Russian Maritime Regis-ter of Shipping]. 2002, № 25, pp. 147-162.

4. Efremov L.V. Teorija i praktika issledovanij krutil'nyh kolebanij silovyh ustanovok s primeneniem komp'juternyh tehnologij [Theory and Practice of research of torsional vibration of ma-chinery installations using computing technologies.]. St. Petersburg, Nauka Publ., 2007, 276 p.

5. Ker-Vil'son U. Vibracionnaja tehnika [Vibration Machinery]. Moscow, GNTIML, 1963, 415 p.

6. Terskih V.P. Krutil'nye kolebanija valoprovoda silovyh ustanovok [Torsional vibration of the ship's plants] Sudostroenie Publ., 1971, 300 p.

7. Efremov L.V., Troickij A.V., Buharina G.I., Ivanov M.Ju.. Metody ocenki dopuskaemyh naprjazhenij ot krutil'nyh kolebanij kolenchatyh valov sudovyh DVS [The Methods ofetstimationofthe permissible stresses forcrankshafts ofMarine I.C.E. due to torsional vibration]. Trudy CNII im. akad. A. N. Krylova [Proc. of CSRI after the name of Academic A.N.Krylov]. 2004, iss. 8 (302), pp. 16-27.

8. Konstrukcija i prochnost' kolenchatogo vala [Design and Strangth of Crankshaft]. Sbornik statej. Perevod B.M. Pokornogo. Pod redakciej N.S. Hanina [Digest ofArticles. Interpreta-tion by V.M.Pokorniy. Under Editorship ofN.S.Hanin]. Moscow, Mashgiz Publ., 1963, 107 p.

9. GOST 25.504-82 "Raschety i ispytanija na prochnost'. Metody rascheta harakteristik soprotivlenija ustalosti" [State Standard 25.504-82 "Strength calculations and tests. Calculation Methodth for the parameters of the thensile strength resisnance"]. Moscow, Gosstandart Publ.

10. Rossijskij morskoj registr sudohodstva. Sbornik normativno-tehnicheskih materialov [Russian Maritime Register of Shipping. Digest of Normative and Methdological Materials]. St.Petersburg, Book 13, 2004.

 

About authors 

L.V. Efremov - Institute of problems of mechanical engineering Russian Academy of Sciences, St. Petersburg

M.Yu. Ivanov - FAI "Russian Maritime Register of Shipping," St. Petersburg, e-mail: ivanov.my@rs-class.org

For citation: L.V. Efremov,  M.Yu. Ivanov. Estimation of permissible stresses due to the torsional vibration of crankshafts of internal combustion engines. Research Bulletin by Russian Maritime Register of Shipping. 2018, No. 52/53, pp. 81-87.

* * *

UDC:  629.12-233/12
Pages:  81-87