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The effect of corrosion on the frequency vibrational modes of a pressurized cylindrical fuel tank with ellipsoidal head caps was investigated in this paper. The frequency variation laws were determined by a polynomial interpolation. This method is simple, flexible and has efficient advantages, and it can shorten the optimal design of cylindrical pressurized fuel tanks with ellipsoidal head caps. Introduction Structure integrity and dynamic behavior of modern cars with pressurized fuel tanks have gained much attention in mechanical vibration analyses [1, 2]. In modern cars, a pressurized cylindrical fuel tank [3-6] is subjected to various dynamic random external influences [7-12]. Mechanical resonance between the vibration frequency of the tank and the frequency of excitement system determines the tank resonance. The vibration characteristics of the cylindrical pressurized fuel tank with ellipsoidal head caps are determined in terms of load shift, forces and moments induced by the car movement, and dynamic load transfer in the longitudinal direction [13-17]. In our study, the frequency response of the cylindrical pressurized fuel tank with ellipsoidal head caps was calculated using the finite element method (FEM), considering the typical damage of corrosion occurring on the internal surface, whereby reducing wall thickness. The parameterized modeling of the cylindrical pressurized fuel tank with ellipsoidal head caps was done in the AutoCAD Autodesk 2017 software [18], which was imported to SolidWorks 2017 software [19] for analysis with the: Static, Thermal and Design Study modules. The Optimal Design of the Cylindrical Tank with Ellipsoidal Head Covers In our previous paper an optimal design of the cylindrical pressurized tank with ellipsoidal head covers was proposed [3]. It is composed is by a lateral cover and two ellipsoidal caps (Fig. 1). Figure 1. a) The parametric model of tank with ellipsoidal head covers; b) The sketch of ellipsoidal head cover according the standard DIN 28013. The design data used in this analysis are: the lateral cover with diameter D = 250 mm and length L = 700 mm; the construction material of the sheet, steel AISI 4340; the maximum static hydraulic b) a) The ellipsoidal head cover

The Influence of Corrosion on the Vibration Modes of a Pressurized Fuel Tank Used in Automotive Industry