A multi-rotor damping simulation test combined with design method

Abstract

The invention provides a multi-rotor damping simulation test combined design method which comprises the following steps: performing simulation analysis through finite element software to obtain inherent frequency, modal and vibration mode of a structural system, and then performing test analysis; performing, by a test analysis part, a sweep frequency vibration test on a sample piece on a vibrationtable to obtain time domain vibration data; performing a fixed-frequency test by referring to a design standard to check whether the vibration level meets requirements; performing fast Fourier transform on the test time domain data to obtain frequency domain data, and obtaining a frequency corresponding to a relatively large amplitude peak value in a frequency domain graph; comparing the frequency with the inherent frequency obtained through simulation analysis, correcting a simulation model, and improving the precision of an analysis result; and extracting a proper modal shape, modifying andoptimizing the structure, iterating the steps, and finally obtaining the vibration level meeting the design requirements. According to the method, the structure is optimized through simulation and test parallel analysis, so that the rigidity of the structure and the inherent frequency of the system are changed, and the purpose of active vibration reduction is achieved.

Description

technical field [0001] The invention belongs to the field of unmanned aerial vehicles, and in particular relates to a multi-rotor damping simulation test combined design method. Background technique [0002] The flight stability of existing drones is one of the main technical indicators, and the vibration during flight is an important influencing factor, especially the vibration level of the mounting surface of the flight control sensor is very important to the stability and operability of the aircraft. During the design process of multi-rotor drones, structural vibration must be considered and optimization iterations must be carried out continuously. [0003] At present, passive vibration isolation methods (such as adding high damping rubber, vibration isolators, etc.) are the main means. This method is simple and easy to implement, but it is a weight-increasing design for the overall system. UAVs have extremely high requirements for quality control, and the structural des...

AI Technical Summary

Problems solved by technology

This method is simple and easy to implement, but it is a weight-increasing design for the overall system. UAVs have extremely high requirements for quality control, and the structural design pursues lightweight design.

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