Topology Optimization Of Multi-rotor UAV Frame Structure And Verification Under Ultimate Working Conditions

In recent years,with the development of related control algorithms and microelectronic technologies,multi-rotor UAV have become a research hotspot for scientific researchers.At present,carbon fiber composite materials are more commonly used in the structure of multirotor UAV frames.The production cost of carbon fiber composites is high and the difficulty of processing is great.In order to reduce the manufacturing difficulty,production and subsequent maintenance costs of the multi-rotor UAV frame structure,an aluminum alloy with easy processing design is used as the frame material.This can enhance the rationality of the frame structure design,the flight performance,manufacturing cost and product competitiveness of the multi-rotor UAV.Firstly,the overall design of the multi-rotor UAV frame structure is carried out in this paper.The basic layout of the frame,the selection of the power system,the selection of the center of gravity position and the calculation of the minimum wheelbase are summarized.This lays the foundation for designing a reasonable frame structure and provides data reference for the modeling of the initial design domain in the conceptual design stage.Secondly,at the conceptual design stage,an inertial release topology optimization method was used to obtain an eight-rotor frame structure with a more reasonable material distribution based on the determined parameters and boundary conditions.Then,the strength of the frame is checked,and the structure of the frame is improved and modified according to the check result,so as to obtain a relatively optimal rack structure.Then,the frame is checked for strength.The structure of the frame is improved and modified according to the check result,so as to obtain a relatively optimal frame structure.Next,a detailed design is carried out,taking into consideration factors such as processing technology,manufacturing,transportation and maintenance.The concept frame structure is split into multiple parts.In order to connect the components and assemble them into a frame,the connectors that connect the various parts are designed.Finally,the designed frame structure is assembled,strength verified and Ultimate working conditions verified.The structure of the frame was modified according to the verification results to obtain a well-designed frame.This paper summarizes the overall design of the multi-rotor UAV frame structure.We use the inertia release topology optimization method to guide the design direction for the conceptual design of the frame structure.Finally,detailed design is performed to realize the processing and manufacturing of the frame structure.A forward design process of multi-rotor UAV frame structure is formed,which provides ideas and references for future design of UAV frame structure.