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Daisuke Narita
Hokkaido University of Science Junior College, Teineku, Sapporo, Japan
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering

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Modelling of Thin Structural Polymer Composites for Use of Automobiles -Review- Daisuke Narita; Yoshihiro Narita
EPI International Journal of Engineering Vol 1 No 1 (2018): Volume 1 Number 1, February 2018
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

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Abstract

This review article introduces first a number of previous works and commercial examples on the use of fiber-reinforced polymer materials in the application to automobile structural components, and secondly considers the modeling for thin components of fiber-reinforced polymer composites with emphasis on the roofs and fenders of the automobiles. The need of this study seems obvious, since particularly in the sportive and high-grade automobiles, the composite materials have already replaced conventional metal materials resulting in the significant reduction of structural weight. In such application, laminated composite panels (shallow shells) are used for models of automotive panels. The structural components in the automobile are extensively exposed to vibration excitation and other external disturbances in practical use, and resonance phenomenon may cause disturbing effects such as noise and fatigue. One countermeasure for such negative effects is to make use of tailoring advantages for fiber reinforced laminated composites and the feasibility for optimization process is suggested.
Accurate Results for Free Vibration of Doubly Curved　Shallow Shells of Rectangular Planform (Part.1) Daisuke Narita; Yoshihiro Narita
EPI International Journal of Engineering Vol 4 No 1 (2021): Volume 4 Number 1, February 2021
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022021.05

Abstract

A method is presented for determining the free vibration frequencies of doubly curved, isotropic shallow shells under general edge conditions and is used to obtain accurate natural frequencies for wide range of geometric parameters. Based on the shallow shell theory applicable to thin thickness shells, a method of Ritz is extended to derive a frequency equation wherein the displacement functions are modified to accommodate arbitrary sets of edge conditions for both in-plane and out-of-plane motions. In numerical computation, convergence is tested against series terms and comparison study is made with existing results by other authors. Twenty one sets of frequency parameters are tabulated for a wide range of shell shape and curvature ratio to serve as data for future comparison and practical design purpose.
Co-Authors Yoshihiro Narita Yoshihiro Narita