Numerical investigation on the energy management strategies of a series hybrid unmanned multirotor aerial vehicle
Hybrid power system for UAV(unmanned aerial vehicle)based on a two-stroke engine with a maximum power of 14.9 kW and a power-to-mass ratio of 2.8 was investigated.An in-house quasi-static UAV model including the series hybrid powertrain system and different energy management strategies was developed to characterize the performance of a multi-rotor UAV with 80 kg maximum takeoff weight.The UAV performance was compared using two different energy management strategies and dynamic-programing optimal solutions,then the effects of payloads and battery energies on the fuel consumption and flight duration of an UAV with defined flight profiles were investigated.It was found that an ideal energy management strategy should avoid high-power battery charging and discharging resulting in less power loss of the battery system,and that Equivalent Consumption Minimum Strategy exhibited lower fuel consumption than Rule-Based Strategy.The fuel consumption increased by using more battery energy in a long flight mission due to the low energy density of the battery,while larger payload and shorter flight duration led to higher system efficiency.Despite of anticipated increment in battery power density in the future,hybrid UAVs still exhibit longer flight duration capability than the electrical ones.
series hybridmulti-rotor unmanned aerial vehicleequivalent consumption minimum strategyenergy managementdynamic programming
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