Study of extensions of navigation bridges from different materials by FEA and analytical method

• Published in: IOP conference series. Materials Science and Engineering 2018-08, Vol.400 (8), p.82012
• Main Authors: Juganaru (Mitu), D E, Pipirigeanu (Baboiu), I L, Faitar, C, Damaschin (Popa), V, Panaitescu, M, Panaitescu, F V
• Format: Article
• Language: English
• Subjects: Carbon steels; Construction materials; Finite element method; Modal analysis; Navigation; Resonant frequencies; Titanium; Vibration analysis; Vibration mode
• ISSN: 1757-8981; 1757-899X; 1757-899X
• DOI: 10.1088/1757-899X/400/8/082012

This paper focuses on the study of local vibration occurring in the structure of the ship's navigation bridge wings. Research and methods: The modal shapes and own frequencies of this wings, that are designed like beam type structures with different lengths and sustaining angles, are determined with the Finite Element Analysis (FEA) in the FEMAP v11.2 software. The test patterns are [00-00] and [20-45]. The purpose of the modal analysis is to determine the shapes of own modes of vibration and their frequencies, from this we can get information about the resonance frequencies and how it can affect the structure. By changing the construction materials defined in modal analysis from SAE-AISI 1025 Carbon Steel to Grade 23 Titanium, the results obtaining are comparing. Results: From the analysis of these models we can deduct a visible decrease in natural frequency of structures with the support element, in comparison with the structure without support. We can see that natural frequencies obtained by finite element method are superior to those obtained by analytical methods. Also, we can see a visible decrease in the own frequencies of the titanium structures compared to the steel ones.