OPTIMASI MODIFIKASI DOUBLER B737-800 DENGAN METODE ELEMEN HINGGA

• Main Author: Leksono, Shabrina
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/33222
• Institution: Institut Teknologi Bandung

A modification by installing GPS Tracker’s antenna is carried out at station 43, between 500E and 500F frame and between S-1 and S-2R stringer, on B737-800 aircraft. The modification uses a doubler structure to strengthen the skin. The skin has two holes to pass GPS Tracker’s cable. An analysis is needed to know whether the modification is optimum and the stresses in the skin satisfy the safety margin requirement. This research is carried out by analyzing the stresses for the problem above by using the finite element method. Assembly model geometry is according to the B737-800 SRM. The assembly consists of 3 parts, namely a doubler, a skin and rivets. The skin and the doubler are modelled as shell elements, while the rivets are modelled as bushing elements. The modelling process is carried out by using the CATIA software and the analysis is using the ABAQUS software. The type of analysis is a linear static analysis. In the research, it is assumed that the antenna’s structure does not withstand the load. The applied load is a pressure on the inner skin surface due to the internal cabin pressure. The following subjects are involved in the development of configuration options: a). geometry changes of antenna’s holes by combining the holes and increasing the diameter of the holes, b). rivet installation between antenna’s holes, and c) doubler thickness variation. The purpose of the analysis is to evaluate whether significant differences of stresses occur relative to the existing modification. The results of the research show that combining the antenna’s holes or increasing the diameter of the holes will increase the stresses around the holes. Rivets installation between antenna’s holes does not have a significant influence on the load paths and stresses. A thicker doubler will decrease the stresses around antenna’s hole. From six configurations that have been simulated, only the increased doubler thickness that has a positive safety margin, eventhough still below 0.5. For future research it is recommended to include the antenna’s structure to withstand the load, to conduct a fatigue analysis and to add a doubler below the skin.