Digital analysis method and system for noise of rotorcraft

Abstract

The invention discloses a digital analysis method and system for noise of a rotorcraft. The method comprises the following steps: performing rotor flow field simulation on the rotor craft; pratitioning blades of the rotorcraft; calculating the time domain noise of each blade block by adopting an FW-H equation; calculating the sound pressure level and noise contribution of the blade block based on the time domain noise of the blade block, and determining a sound source area; carrying out pressure gradient-based self-adaptive blocking on the sound source area; calculating the time domain noise of each adaptive block by adopting an FW-H equation; calculating the sound pressure level and noise contribution of the adaptive block based on the time domain noise of the adaptive block, and determining the position of a sound source; and calculating the digital aerodynamic noise of each adaptive block by adopting a complex flow area blade block noise change equation determined by an FW-H equation, and determining the noise generation reason at the sound source position according to the digital aerodynamic noise. According to the method, the influence of flow and noise detail change can be accurately described, and the accuracy of noise analysis of the rotorcraft is improved.

Description

technical field [0001] The invention relates to the field of aircraft noise analysis, in particular to a method and system for digital analysis of rotorcraft noise. Background technique [0002] The rotorcraft has a unique vertical take-off and landing method and the ability to hover in the air. Some new configuration rotorcraft, such as tilting rotor aircraft and high-speed coaxial helicopters, have a certain high-speed cruise capability and play an indispensable role in various fields. . During the working process of the rotorcraft, the rotor, tail rotor and large-sized fuselage of the high-speed rotor will disturb the surrounding air, thereby forming aerodynamic noise. The new configuration rotorcraft has the characteristics of multi-rotor and multi-acoustic source coupling, etc., the aerodynamic environment in which it flies is more complex, and the influence of aerodynamic noise is more obvious. Therefore, the research on aerodynamic noise of rotorcraft is one of the ...

AI Technical Summary

Problems solved by technology

[0006] To sum up, scholars at home and abroad have conducted research on rotor aerodynamic noise in various fields, and have drawn meaningful conclusions, but most of them are from the perspective of integration, considering the noise influence of the entire rotor, and it is difficult to consider the rotor flow field. The influence and internal mechanism of some details in the characteristics of the aerodynamic load and aerodynamic noise, therefore, the accuracy of the noise analysis of the rotorcraft needs to be improved

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