Research on Determination Method of Limit Unavailable Fuel Amount of Low-cost Expendable UAV
For a low-cost expendable UAV,in order to maximize its fuel efficiency,it is necessary to measure the limit of its unusable fuel under a predetermined flight combat trajectory.In this paper,a method for determining the limit unavailable fuel quantity is proposed for a certain type of low-cost expendable UAV.The database of the UAV's unavailable fuel in a specific attitude is established by cutting the angle of the fuel surface,and the mathematical relationship between the unavailable fuel and the pitch and roll angles of the UAV in all the attitudes is fitted on the basis of the database;the theoretical residual fuel over time simulated by the UAV according to the six-degree-of-freedom mathematical model is compared with the unavailable fuel of the corresponding attitudes at the corresponding moments,and the ultimate unavailable fuel of the UAV under a specific flight mission is determined.Compare the theoretical residual fuel quantity of the UAV simulated according to the six-degree-of-freedom mathematical model with the corresponding attitude at the corresponding moment,and determine the limit unavailable fuel quantity of the UAV under a specific flight mission.The error between the limit unavailable fuel quantity calculated by this method and the actual remaining fuel quantity of the UAV is only 0.27L,which is smaller than the 3.68L in the traditional method of calculating the unavailable fuel quantity of civil aviation aircraft,and the error has been reduced by 3.41L and the fuel utilization has been improved by 3.9%,which demonstrates the accuracy and feasibility of this method.
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