earticle

영어

There are various restrictions in the requirements of aircraft and instrument depending on their operational circumstances. Especially, strict vibration requirements are applied to aircrafts with high level of maneuvering. In this paper, new attachment was installed in the cockpit of a propeller aircraft which served a high level of maneuvering, and vibration influence caused by the new equipment was presented. Futhermore, the validity for design of the new equipment's supporting structures was verified by examining the vibration influence and by meeting the requirements. The finite element analysis is an important tool in evaluating the dynamic characteristics of aircraft before and after its modification. The dynamic characteristics analysis was performed in two stages. In the first stage, mode analysis was performed to identify the natural frequency of the supporting structure and to derive the dynamic change of the instrument panel by installing the supporting structure and new equipment. And in the second stage, random vibrations which spectrum specified in MIL-STD-810G was applied to the FE model of before and after modification is carried out.