ANISOGRID WING STRUCTURE FLUTTER ANALYSIS ON JET FIGHTER AIRCRAFT BY USING MSC NASTRAN SOFTWARE

• Main Author: Arif Izzuddin, Mohammad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/62002
• Institution: Institut Teknologi Bandung

The fighter aircraft made must refer to the standard fighter aircraft structure so that the aircraft is safe and airworthy. The aircraft structure will be said to be safe if there is no failure phenomenon. Flutter is one of the instability phenomena due to the interaction of aerodynamic, inertia, and elastic forces that have the potential to cause catastrophic failure. Therefore, it is necessary to conduct a flutter study at the preliminary design stage of aircraft design. Anisogrid means a structural architectural design concept based on the arrangement of structures resembling grids. In the aviation industry the concept of anisogrid structure has been applied and is still in the process of further research. This final report aims to examine the anisogrid wing structure of a fighter aircraft made of composite material from the flutter phenomenon. The wing structure model which has been analyzed statically in the previous study was modified with the addition of fuel and armament. Structural dynamics analysis was also carried out to determine the mode shape of the structure using the finite element method with the help of MSc Nastran software. From the results of the analysis that has been carried out on the speed range of the supersonic regime, there is no indication of flutter. The justification of the result which has a very stiff modulus of elasticity carried out by reducing the modulus of elasticity of the composite to 6.6%, which indicates flutter at a critical speed of 775 m/s for the configuration of adding fuel and 1500 m/s for adding fuel and armament. Enlarging the range of speed values to the hypersonic regime shows flutter indications at a critical speed of 2200 m/s for the configuration of adding fuel and 2150 m/s for the configuration of adding fuel and armament.