Optimization Design Of Engine Mounting System Of Small UAV

With the development of UAV technology for vibration and vibration levels are increasingly high requirements. Many failures are directly attributable to UAV vibration loads in flight. When UAV is flying in the air, the engine is the main vibration source. Therefore, the matching of UAV engine mount system directly affects the UAV vibration in flight, and to improve the vibration isolation performance of UAV engine mounting system is one of the main ways to reduce vibration and improve the performance of UAVs.Rubber isolator is a core part of the engine mounting system, and the gap of current using vibration isolator created when it works has disadvantages on vibration isolation, in order to eliminate the gap, pre-compression is required for isolators. For determining the amount of pre-compression, the UAV engine incentive loads and engine vibration isolation theory are in-depth studied firstly; Then study the finite element modeling technology of rubber material, static analysis and transient analysis of the current using engines Rubber Isolator are done in ANSYS, and determined the analysis isolator axial pre-compression as1.5mm by the results, finally under different axial pre-compression, the UAV machine vibration test are acted, experimental results show that the vibration grow down obviously with pre-compression as1.5mm, which verified isolator optimization results.Engine mount bracket is an important component of the engine mounting system, the stiffness and mass of one mounting bracket directly affects its isolation effectiveness and UAV weight. Firstly, steel of the original holder is insteaded of the lightweight aluminum, and adds additional support; then topology optimization of mounting bracket is done using ANSYS, and get the best topology; Finally, modal analysis and strength analysis are done for the new mounting bracket, and form which we know that the optimized bracket not only the quality of the stent reduces0.84kg, the fundamental frequency also increases from the289Hz to546Hz,which meet the requirements of stent design.This optimization, simulation and test results for small UAV engine vibration and lightweight design has a certain reference.