Parunov, Joško and Ćorak, Maro and Žiha, Kalman and Radanović, Jadranka (2014) Pregled gamma funkcija kod akumuliranog proračuna zamora brodskih konstrukcija. = Review of gamma functions in accumulated fatigue damage assessment of ship structures. In: XXI. simpozij Teorija i praksa brodogradnje, in memoriam prof. Leopold Sorta = The 21st symposium Theory and practice shipbuilding, in memoriam prof. Leopold Sorta, 02-04.10.2014., Baška; Croatia.
|
Text
REVIEW OF GAMMA FUNCTIONS IN ACCUMULATED FATIGUE.pdf - Published Version Jezik dokumenta:English Download (207kB) | Preview |
Abstract (Croatian)
Palmgren-Miner (P-M) pristup je najstarija, najjednostavnija i najčešće korištena metoda za proračun zamornog oštećenja brodskih konstrukcija. Pod pretpostavkom Weibullove distribucije raspona naprezanja, klasifikacijska društva su usvojila P-M analitičke izraze za proračun akumuliranog oštećenja. U upotrebi postoji više verzija sličnih izraza te svaki od njih uključuje neki oblik Gamma funkcija. Stoga, točna procjena Gamma funkcija predstavlja jedan od ključnih parametara za pouzdan proračun zamornog oštećenja. Primijećeno je da pravila za proračun zamora kod brodskih konstrukcija ne posvećuju dovoljno pažnje preciznoj definiciji Gamma funkcija, uzrokujući tako gubitak vremena i eventualne greške u proračunu. Ovaj članak predstavlja pregled izraza za proračun akumuliranog oštećenja važnijih klasifikacijskih društava, nastojeći rasvijetliti kako i koji tip Gamma funkcije efikasno odrediti.
Abstract
Palmgren-Miner (P-M) approach is the oldest, simplest and the most frequently applied method for cumulative fatigue damage assessment of ship structures. By assuming Weibull distribution as probability distribution of stress ranges, closed-form P-M expressions for accumulated damage calculation are adopted by Ship Classification Societies. There are several versions of such expressions currently in use and all of them implement various kinds of Gamma functions. Accurate evaluation of Gamma functions is therefore of crucial importance for reliable accumulated damage calculation. However, it is noticed that fatigue rules provides insufficient attention to the precise definition of Gamma functions, causing unnecessary wasting of time and possible mistakes. The present paper gives review of expressions for accumulated damage assessment proposed by major Classification Societies aiming to clarify which kind of Gamma functions are used and how to calculate them efficiently.
| Item Type: | Conference or Workshop Item (Lecture) |
|---|---|
| Uncontrolled Keywords: | zamorno oštećenje; gamma funkcije; klasifikacijska društva |
| Keywords (Croatian): | fatigue damage; gamma functions; classification societies |
| Subjects: | TECHNICAL SCIENCE > Shipbuilding |
| Divisions: | 600 Department of Naval Engineering and Marine Technology > 620 Chair of Marine Structures Design 600 Department of Naval Engineering and Marine Technology > 630 Chair of Ship Design and Offshore Technology 600 Department of Naval Engineering and Marine Technology > 640 Chair of Shipbuilding Technology |
| Indexed in Web of Science: | No |
| Indexed in Current Contents: | No |
| Date Deposited: | 18 May 2015 07:03 |
| Last Modified: | 05 Oct 2017 13:28 |
| URI: | http://repozitorij.fsb.hr/id/eprint/4170 |
Actions (login required)
 |
View Item |
Download Statistics
Download Statistics