INVESTIGATING THE INFLUENCE OF CERTAIN PARAMETERS ON THE DYNAMIC CHARACTERISTICS OF A COMPOSITE WING STRUCTURE

Marwa  . Agela; Gamal  G Ashawesh

Authors

Marwa L. Agela Aeronautical Engineering Department, Faculty of Engineering, University of Tripoli, Libya.
Gamal M. Ashawesh Aeronautical Engineering Department, Faculty of Engineering, University of Tripoli, Libya.

Keywords:

KEYWORDS: Stiffnesses; Composite Material; Fibre Orientations; Free Vibration. INTRODUCTION

Abstract

ABSTRACT

This paper discusses the effect of some parameters such as fibre orientations, laminate stacking sequence, aspect ratios and stiffness of the rectangular composite wing box models for the free vibration analysis on two wing configurations, the first one producing a material coupling, bend-twist stiffness and the other without material coupling, bend-twist stiffness vanishes. A computer program within MATLAB language is developed to deal with the calculation of the bending, torsion and bend-twist stiffnesses ( , , and ) for the two wing configurations in order to understand their behaviour. Free vibration analysis is also carried out using the finite element program MSC/PATRAN and MSC/NASTRAN v2004 for the same wing configurations. The maximum bending stiffness, torsion stiffness and bend-twist coupling stiffness are found at 0^o, ±30^o and ±20^o fibre orientations respectively for the CAS and with zero coupling for the CUS models. It was found that wing stiffnesses are universally proportional with the aspect ratios. A similar variations of the material stiffnesses, eigenvalues and associated eigenvectors versus fibre angle are observed. The effect of aspect ratio on the fundamental bending frequency is almost negligible compared with the torsional frequency, whereas is more pronounced on the torsional frequency compared with bending frequency.

Author Biographies

Marwa L. Agela , Aeronautical Engineering Department, Faculty of Engineering, University of Tripoli, Libya.

In 2014, a decision was issued to appoint a teaching assistant in the Department of Aerospace Engineering for a period of three years, and in this period I was giving exercise lectures for some materials in the Design and Aerostructures Division and reviewing the files of graduates from the department, and in 2017, a decision was issued against me to send inside and I started studying for a master's degree until the year 2022, where I finished the thesis and obtained a master's degree, and in the spring of 2023 I started teaching as a faculty member in the Department of Aerospace Engineering, and currently I am Teaching courses, monitoring the process of conducting exams, grading, supervising graduation projects, and reviewing the graduates' file.

Gamal M. Ashawesh, Aeronautical Engineering Department, Faculty of Engineering, University of Tripoli, Libya.

Gamal M. Ashawesh is one of the staff members in the Aeronautical Department at the Faculty Engineering, University of Tripoli. He is working in the department since 2012-08-28. He teaches several courses in the undergraduate and Post-graduate levels and has several publications in his field of interest.

I was appointed at the University of Tripoli on 8/28/2012 with the academic degree of Professor and started my work in the department on 8/30/2012. I am dedicated to teaching and scientific research tasks in the field of structural analysis of flying objects in the Department of Aeronautical Engineering at the Faculty of Engineering. I currently work as a faculty member for bachelor's and postgraduate degrees, as well as supervising research projects to obtain bachelor's and master's degrees, and as a coordinator of the Design and Structures Department, a member of the Department's Curriculum Committee at the College, and a member of the Department's Faculty Admission Committee.

INVESTIGATING THE INFLUENCE OF CERTAIN PARAMETERS ON THE DYNAMIC CHARACTERISTICS OF A COMPOSITE WING STRUCTURE

Authors

Keywords:

Abstract

Author Biographies

Marwa L. Agela , Aeronautical Engineering Department, Faculty of Engineering, University of Tripoli, Libya.

Gamal M. Ashawesh, Aeronautical Engineering Department, Faculty of Engineering, University of Tripoli, Libya.

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