高空无人机桨发匹配设计及效率提升OA北大核心CSTPCD

The propeller-motor matching design of electric propulsion system is a key link for high-altitude unmanned aerial vehicle(UAV)to achieve long-endurance flight.According to the full-profile power requirements of the high-altitude UAV,the overall parameter matching design for the motor and propeller of the electric propulsion system was carried out by using the power loss method and the single-point method,respectively,and the tensile force and power characteristics of the electric propulsion system were measured through ground static test.At the same time,the surrogate model based on BP(back propagation)neural network was established on the basis of the confirmed motor selection,in order to carry out the propeller-motor matching design and efficiency improvement for the electric propulsion system.The test results showed that the measured tensile force was consistent with the calculated tensile force,which indicated that the adopted overall parameter matching design method for the motor and propeller had high accuracy.Taking the climb profile with elevation angle of 5° as an example,the efficiency of the new propeller obtained by optimized matching through the surrogate model was improved by about 0.1,and the energy saving effect was remarkable.The relevant surrogate model can provide a powerful tool for the propeller-motor matching and optimization design of the UAV electric propulsion system in the scheme design and later engineering use stage,as well as the improvement of dynamics characteristics and economy.