Research On Vertical Takeoff And Landing Fixed-wing UAV

The vertical take-off and landing fixed-wing UAV is an unmanned aerial vehicle that effectively combines the vertical take-off and landing capability of a multi-rotor UAV and the efficient cruising capability of a fixed-wing UAV.Due to its unique take-off and landing-cruising performance,the vertical take-off and landing fixed-wing UAV have great application prospects used in military applications such as military reconnaissance,unmanned frontier defense,and battlefield situation acquisition,and civil engineering fields such as oil transmission pipeline inspection,complex airspace rapid delivery,and aerial photography.Vertical take-off and landing fixed-wing UAV can be roughly divided into four types: compound tilting type,tilting rotary type,power composite type and tailstock type.Most of the current research on vertical take-off and landing fixed-wing UAV focuses on various types of overall design and improvement,while the performance comparison of several types of UAV is relatively rare.Because the tailstock type and the first three types have great differences in the overall design and control principle,this paper mainly compares and analyzes the three types of compound tilting type,tilting rotor type and dynamic compound type.In this paper,the three kinds of unmanned aerial vehicles with compound tilting type,tilting rotary type and power composite type are summarized.Inductive analysis of their respective development history and research trends,comparative analysis of their respective advantages and disadvantages and technical bottlenecks,thus providing a basis for further research design and performance analysis.Then,according to the specific design indicators,the overall scheme of the UAV corresponding type of the flying wing compound tilting drone,the distributed tilting rotor unmanned aerial vehicle and the large aspect ratio composite drone is designed.The operation mode and typical flight status of the three-type drone are introduced separately.Then,the xflow aerodynamic software is used to analyze and compare the liftresistance characteristics and three-dimensional aerodynamic characteristics of the three-type UAV.At the same time,the transition state of the wing-tilt tail-end,the distributed tilt-rotor UAV and the transition state of the large aspect ratio hybrid UAV are analyzed.The ANSYS software WORKBENCH module is used to analyze the structural strength of the large aspect ratio hybrid UAV wing,and the deformation cloud and safety factor cloud map of the wing are obtained.Finally,the overall weight,power consumption and voyage time of the drone are analyzed and calculated.Under the premise that the take-off weight of the three-type drone is the same,the flight time of the drone is compared and the layout design of the maximum voyage is obtained.Finally,performance evaluation and optimal evaluation of each design layout are carried out according to flight time and specific design.At the same time,it also provides reference and technical support for the design of other vertical take-off and landing fixed-wing UAVs of the same type.