Layered progressive design optimization method for power system of electric vertical take-off and landing aircraft

Abstract

The invention discloses a layered progressive design optimization method for a power system of an electric vertical take-off and landing aircraft. The method comprises the following steps: extracting task profile power and energy consumption requirements based on the electric vertical take-off and landing aircraft (eVTOL); designing parameters of the electric power system based on static optimization; and optimizing parameters of the electric power system based on power matching. According to the method, based on hierarchical progressive design of energy conversion and power matching, the defects of a traditional model selection and design method in the aspects of model precision and electrodynamic force performance improvement are broken through, the power system design optimization problem of eVTOLs of different configurations under the condition of a given flight task is solved, the output performance of a power system is improved, the total mass of the eVTOLs is reduced, and the cruising ability of the eVTOL is improved, and the application scene is expanded.

Description

Technical field [0001] The present invention relates to the field of electric vertical start-landing aircraft design, and more particularly to a method of layered-off design optimization of electric vertical start-off aircraft power system. Specifically, the distributed power system selection and power matching design optimization of electric vertical lifting aircraft distributed power-oriented aircraft for mission requirements. Background technique [0002] Electric Vertical Landing Aircraft (hereinafter referred to as evtol) is a new aircraft that is electrically driven, which generally has a distributed electric power system, which is equipped with a propeller or a connotation fan, etc., can provide assistive lift in the take-off phase, and can be used Sliding achieves vertical lifting; at the same time, EVTOL typically has a wing, which can realize cruise flights in fixed-wing aircraft. EVTOL has a vertical take-off and landing performance, at the same time, due to the use of...

AI Technical Summary

Problems solved by technology

[0004] However, there are still some deficiencies in the existing electric power system design methods, which are mainly manifested in: (1) The total mass of the aircraft has a particularly significant impact on its performance, and eVTOLs widely use lithium-ion batteries as energy supply units, while the current At the current technical level, compared with traditional aviation fuels, lithium-ion batteries have lower power density and energy density, resulting in a larger total mass of the aircraft and insufficient performance. The selection method based on the energy conversion relationship mainly considers the nominal working efficiency of each component , in order to ensure the feasibility of the design, the design point is relatively conservative, which is easy to cause performance waste; (2) Each component in the electric power system has dynamic characteristics, such as the output voltage of the lithium-ion battery changes with the remaining power, and the existing design method uses The static model reflects the characteristics of the components and cannot reflect the dynamic characteristics of the electromotive force, which limits the output capability of the electrodynamic system; (3) In order to improve the performance of the designed electrodynamic system, repeated iterations are often required, and the electrodynamic system involves many variables. Time-consuming and labor-intensive modification of design parameters

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