| Title |
Effect of Neglecting Self-Weight on the Natural Frequencies of Composite Laminated Plates with Attached Mass |
| DOI |
https://doi.org/10.12652/Ksce.2025.45.4.0445 |
| Keywords |
첨가질량; 복합적층판; 고유진동수; 자중무시 Attached mass; Composite laminated plate; Natural frequency; Neglecting self-weight |
| Abstract |
This paper presents the effect of neglecting the self-weight on the natural frequencies of simply supported [αββααβ]r type composite laminated plates with attached masses. The presented method utilizes deflection influence surface which can be obtained by any calculation methods, and determines the deflection mode shapes of the structure under resonance conditions based on inertial forces. A parametric study is conducted to examine the influence of several factors, including the number of laminates, fiber orientation, and both the magnitude and location of the attached masses, on the natural frequencies of the laminated plates when self-weight is neglected. The analysis results show that the ratio of natural frequencies with and without considering self-weight is scarcely affected by the number of laminates, but is significantly influenced by the magnitude and location of the attached mass. Notably, the influence of fiber orientation varied depending on the location of the attached mass, and when the attached mass was positioned equidistance from the x and y axes, the fiber orientation had no effect on the natural frequency ratio. Also, the closer the attached mass is to the center of the plate, the more rapidly the natural frequency without considering self-weight converges to that with self-weight. Based on these results, it is possible to estimate the actual natural frequencies from those calculated by a simple method neglecting self-weight in case of where attached masses are present. The results of this study can serve as a fundamental reference for the dynamic analysis and design of composite laminated plates with attached masses. |