Optimization Design of Engine Support System of Small UAV
|School||Graduate Schoo,Chinese Academy of Sciences|
|Course||Mechanical Manufacturing and Automation|
|Keywords||Engine Support System of UAV Topology Optimization ModalAnalysis Fatigue Analysis|
Based on the requirements of strength and dynamic performance of the power system of UAV to the engine support system and the requirements lightweight design, the paper has used dynamic analysis and topology optimization to design the engine support system, and then verified the support system which was designed through the calculation and analysis of finite element method and its experiment.Firstly, the engine is carried on the stress analysis, according to the analysis results, we know the reason of engine vibration is overturning moment, its size is equal to the output torque of the engine, and the peak torque of engine shaft of the propeller operating within a week is measured by the test of peak torque of engine. Then using the loads to the optimization design of engine support system, according to the design result, the parameters of shock absorber of support system is reasonable selected, meanwhile the topology structure of material distribution for support and clapboard of the system is get, according to the contour surface profiles of density, structure system can be handled, and the design scheme of supported system is get.Then using the software of finite element analysis that is Patran/Nastran to analyze the static and dynamic of engine support system newly designed, the stress distribution under the conditions of maximum load is solved, contrasting the test results of intensity, the strength of engine support system meet the requirements and stress distribution is uniform, and according to the results of modal analysis, engine support system avoided incentive resonance region, having a rational dynamic characteristics.Finally, using the software of MSC.Fatigue to fatigue analysis for the engine support system, and the prediction results of fatigue life is obtained, then we can improve the support system to enhance its service life according to the analysis results. Final the engine support system having the compact and reliable for connection and high strength and good dynamic performance and convenient installation is designed.