Numerical simulation method for aerodynamic noise of propeller of unmanned aerial vehicle

Abstract

The invention discloses a numerical simulation method for aerodynamic noise of a propeller of an unmanned aerial vehicle. The method comprises the following steps: for an unmanned aerial vehicle propeller model, dividing grids according to the grid quantity, and adding a boundary layer to the propeller model to obtain a calculation grid file; reading a computational grid file, establishing a propeller flow field control equation, determining initial conditions and boundary conditions, discretizing the control equation, and setting solution control parameters according to the initial conditions and the boundary conditions after discretization; decomposing the calculation area, and performing parallel calculation by using open source fluid dynamics calculation software to obtain flow field data; the method comprises the following steps: discretizing the surface of a propeller blade, importing flow field data into a sound field calculation program, calculating the sound pressure of an observation point through an integral method, and calculating the sound pressure of the propeller blade from different sound sources to the observation point at the same moment in parallel; the time domain change of the sound pressure of the observation point is converted into frequency domain change through Fourier transform and post-processing is carried out, so that noise is analyzed. The calculation process is simple, and the calculation efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of unmanned aerial vehicles, and more particularly, to a numerical simulation method of aerodynamic noise of a propeller of an unmanned aerial vehicle. Background technique [0002] As UAV-like vehicles become more commonplace, the market for novel vertical take-off and landing vehicles, including UAVs for applications such as package delivery, imaging, and surveillance, is growing rapidly. And many commercial drones have achieved stable hovering and maneuvering flight, and are expected to be used in various fields. Considering the use of drones in cities or some special areas, the high level of noise can be a serious problem, so it is important to control the aerodynamic noise generated and transmitted by such aircraft. Minimizing noise emissions is an integral part of designing an aircraft and must be considered from the outset to avoid costly redesign issues. Acoustic comfort is a very important issue f...

AI Technical Summary

Problems solved by technology

However, most of the existing value simulation methods have the following disadvantages: rely on commercial software implementation, because the commercial software is not open source, so the problems or errors in the calculation process are unknown, and the algorithm cannot be optimized or changed in time; the calculation speed is slow , for complex propeller shapes, both the calculation of the flow field and the calculation of the acoustics require a large amount of intensive calculations, and such a large amount of calculations is very time-consuming

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