Dynamic Analysis And Structure Optimization Of An Airborne Equipment Bracket

Because the airborne equipment may be subject to worse mechanical vibration and other environmental impacts, structural dynamics analysis and optimum structural design about airborne electronic equipment are very important and must be done in order to constantly improve the performance of modern airplane, aircraft and other aviation equipments.Taking an airborne electronic equipment mounting bracket as the study object, firstly the modal analysis theory, DOE theory and the method of structural optimal design based on agent model are described in this paper. Parameterized finite element analysis model is established and Dynamic characteristics are calculated according to the research status and existing problems and considering the actual structure size and operating conditions about the mounting bracket. Then the result is verified through experimental modal testing. Based on above study works, the DOE theory is introduced. Then using optimization methods combined the optimal design theory with DOE theory, Mount structure optimization is proposed. At last, a more reasonable mounting bracket is obtained. The major research works mainly are reflected in the following aspects.(1) The3-D modelling of airborne equipment bracket is set up by using SolidWorks software. After taking3-D model, selecting elememt, imputing materials parameters and dividing mesh, the finite element modeling is established by ANSYS software, and this method can be used in other electronic equipments.(2) An experiment modal test system of airborne equipment bracket is built. The natural frequeney and vibration modal is obtained by the ANSYS ealculation modal analysis and experimental modal analysis, and their results are analyzed comparatively, the results show the ANSYS ealculation modal analysis is accurate.(3) By design of experiment (DOE) analysis, the main structure factors effecting airborne equipment bracket modal frequeney are obtained.(4) Aiming at addressing the optimization design problem with implicit objective performance functions and time-consuming for a large amount of numerical simulations, an optimization design methodology based on the metamodel is proposed. The structure optimization of the airborne equipment bracket is achieved by using this methodology. The results show that this methodology is feasible and highly effective, and thus can be used in the optimum design of other electronic equipments.