Efficiency optimization selection method for power system of multi-rotor aircraft
A multi-rotor aircraft and power system technology, applied in the field of UAV design, can solve the problems of high cost and low efficiency
Active Publication Date: 2020-11-13
BEIHANG UNIV
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Problems solved by technology
The actual design process often requires extensive trial and error experiments to determine an efficient motor-propeller combination, but this approach is inefficient and expensive
Method used
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[0084] Here we take T-MOTOR’s U series motors and CF series carbon fiber propellers as examples to optimize the multi-rotor power system.
[0085] Assuming that the optimal power system needs to be designed for the following multi-rotors, the required parameters of the multi-rotors are as follows: the number of propellers n p = 4; weight m copter =20kg; maximum vertical acceleration a c =9.8m / s 2 ;Air density ρ=1.15kg / m 3 (height h=250m); gravitational acceleration g=9.8m / s 2 . In this way, formula (1) and formula (2) can be solved to obtain the tension demand of the power system as: hovering tension T hover =49N, pull force T at full throttle max =98N.
[0086] Taking the motor T-MOTOR U11 KV90 as an example, the parameters and experimental data of the motor can be found through the official website. After necessary calibration of the motor parameters through the experimental data, the motor parameters can be obtained as
[0087]
[0088] Step 1: Determine the opti...
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The invention provides an efficiency optimization and accessory type selection method for power systems of multi-rotor type aircrafts. The efficiency optimization and accessory type selection method includes four steps of firstly, solving the optimal numbers of blades of propellers under the condition of known motor parameters; secondly, solving the optimal pitch angles of the propellers under theconditions of the known motor parameters and the numbers of the blades; thirdly, solving the optimal diameters of the propellers under the conditions of the known motor parameters, the numbers of theblades and the pitch angles; fourthly, selecting the optimal motor and propeller combinations according to optimization constraints. The efficiency optimization and accessory type selection method has the advantages that the efficiency optimization and accessory type selection method is based on optimization processes, the efficiency of motors and the efficiency of the propellers can be comprehensively optimized under the condition that design requirement constraints and motor safety constraints are taken into sufficient consideration, and accordingly optimal-efficiency accessory type selection processes for the power systems of the multi-rotor type aircrafts can be obtained; the efficiency optimization and accessory type selection method is speedy and effective, the optimal propellers can be obtained by the aid of analysis processes, the optimal motors can be obtained by the aid of numerical processes, and accordingly large quantities of error and trial experiments of the traditionalmethods can be omitted.
Description
technical field [0001] The invention relates to an efficiency optimization and accessories selection method of a power system of a multi-rotor aircraft, belonging to the field of unmanned aerial vehicle design. Background technique [0002] With the development of multi-rotor aircraft technology, the problem of insufficient endurance time has become more and more prominent. When the battery technology encounters a bottleneck, improving the efficiency of the power system is a direct and effective way to improve the endurance time of the multi-rotor. The multi-rotor power system has four main components: motor, propeller, electronic governor and battery, among which, the motor and propeller are the main components that determine the efficiency of the power system. The efficiency of the motor-propeller combination has a complex relationship with the motor parameters, propeller parameters and actual flight conditions. The actual design process often requires extensive trial-an...
Claims
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IPC IPC(8): B64F5/00B64C27/14
CPCB64C27/14B64F5/00
Inventor 全权戴训华任锦瑞
Owner BEIHANG UNIV