A Certain Type Of Airborne Electronic Equipment Installation, Kinetic Analysis And Optimization Design

Along with the advance of the capability of modern plane, the airborne equipments will be suffered from a vile vibration. According to American Military statistic, vibration effect is about 27% in resulting failure of airborne equipments. In order to enhance the airborne equipments'reliability, the comprehensive structure dynamic analysis and structure dynamic optimization of them are necessary.Based on the structure and working situation of an airborne equipment bracket, an accurate parametric finite element model is established. The dynamic characteristics of the device are obtained by an experimental testing. The boundary condition, the working condition, the simulation of damper and the finite element mesh size criteria are the critical issues that should be studied in the analysis. More information is got by a further random vibration analysis, such as acceleration power spectral density of some key position of the bracket, displacement and acceleration response.After the breakage of existing equipments was summarize, combined with the dynamic characteristics obtained by finite element dynamic analysis, a research on structure dynamic optimization design of the bracket is developed. The shape and dimension optimization design are performed to reduce weight, enhance natural frequency and decrease the stress in random vibration. At last, the optimized bracket sample is manufactured. The validity of the optimization design is proved by a durability performance test.This thesis deals with structure dynamic analysis and dynamic optimization of airborne bracket based on finite element method. The result of this paper offers useful reference for airborne bracket structure design. Also this method can be beneficial to the new design and modification of the avionic device.