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Finite element-finite volume simulation of underwater explosion and its impact on a reinforced steel plate

Valdani Arman Jafari, Adamian Armen

Archive of Mechanical Engineering

2020

LXVII, nr 1

5--30

Marine structures are one of the most important industrial and military equipment in each country that should be protected against external forces. The main aim of this paper is a detailed investigation of the underwater explosion (UNDEX) and its effects on marine structures. For this purpose, the UNDEX structure was studied qualitatively and quantitatively using numerical methods. Then, the effects of blast waves on a marine structure reinforced by perpendicular blades were investigated. Finite element and finite volume schemes were used for discretization of the governing equations in the solid and fluid media, respectively. Also, for fluid-structure interaction (FSI), results of fluid and solid media were mapped to each other using the two-way FSI coupling methods. A comparison of numerical results with the empirical formula revealed that the trend of pressure-time curves was reasonable, approving the validity of the numerical method. Moreover, the numerical results indicated that detonation of 1 kg trinitrotoluene (TNT) creates a pressure wave with maximum amplitude of 24 MPa at a distance of 2 m. Also, it was found that the reinforcement blades can be used to improve the resistance of structures against explosive charges, which also results in the reduction of structures deformation.

FMEA analysis of UVG (unmanned ground vehicle) electric powertrain system

Ferencey V., Stanak V., Bugar M.

Zeszyty Naukowe Instytutu Pojazdów / Politechnika Warszawska

2011

z. 2/83

17-20

This paper deals with failure modes and effect analysis which is applied to the electric powertrain system of Unmanned Ground Vehicle. Failure Modes and Effects Analysis (FMEA) is a method to analyze potential reliability problems in the development cycle of the project, making it easier to take actions to overcome such issues, enhancing the reliability through design. FMEA is used to identify actions to mitigate the analyzed potential failure modes and their effect on the operations. Anticipating these failure modes, being the central step in the analysis, needs to be carried on extensively, in order to prepare a list of maximum potential failure modes.

Referat pokazuje zastosowanie metody FMEA (FailureModes and Effects Analysis), do analizy niezawodności elektrycznego systemu napędowego Bezzałogowego Pojazdu Taktycznego (UGV - Unmanned Ground Vehicle). FMEA jest metodą analizy potencjalnych problemów z niezawodnością w cyklu rozwoju projektu, co ułatwia podejmowanie działań w celu przezwyciężenia tych problemów i zwiększenie niezawodności poprzez odpowiednie projektowanie. FMEA jest używane do identyfikacji działań w celu analizy potencjalnych awarii i złagodzenia ich wpływu na niezawodność systemu. Ukierunkowanie na przyczyny awarii, jest głównym celem tej analizy, musi być prowadzone intensywnie, w celu przygotowania listy najwyższych dopuszczalnych potencjalnych przyczyn awarii.