Rotor aerodynamic noise omnidirectional array

Abstract

The invention discloses a rotor aerodynamic noise omnidirectional array which comprises a plurality of groups of microphones, a plurality of groups of microphone fixing units and an arc-shaped support frame, the plurality of groups of microphones are respectively fixed on the arc-shaped support frame at certain intervals through the microphone fixing units, and each microphone fixing unit comprises a holding chuck, a microphone mounting hoop, a microphone supporting shaft and a hoop. The microphone is mounted in the microphone mounting hoop and locked through the holding chuck, the microphone mounting hoop is in threaded connection with the microphone supporting shaft, the tail end of the microphone supporting shaft is in threaded connection with the front petal of the hoop, and the front petal and the rear petal of the hoop are matched to be arranged on the arc-shaped pipe of the arc-shaped supporting frame in a sleeving mode and move on the arc-shaped pipe, the front section and the rear section of the hoop are fastened and connected through bolts and are fixed on the arc-shaped pipe, and the arc-shaped supporting frame is wrapped with sound absorption cotton. The array is used for semispherical directivity measurement of rotor aerodynamic noise, and the aerodynamic noise test capability of the rotor can be quickly formed; the array has the advantages of simple structure and good measurement coverage.

Description

technical field [0001] The invention relates to an omnidirectional array of rotor aerodynamic noise. Background technique [0002] At present, the traditional method of measuring directivity is based on the method of linear array and circular arc array, which can only measure the noise direction of one side or a single plane. If you want to obtain the noise data of multiple observation points on different planes, you need to perform multiple measurements, so This array form has shortcomings in terms of measurement range and measurement efficiency for rotor blade noise with complex directivity. [0003] In order to obtain the omnidirectionality of rotor noise comprehensively and efficiently, an omnidirectional array that can cover the radiation direction of rotor noise is required. For the lower hemisphere of a helicopter, an omnidirectional measurement array for rotor aerodynamic noise is required. Contents of the invention [0004] Based on the above deficiencies, the o...

AI Technical Summary

Problems solved by technology

[0002] At present, the traditional method of measuring directivity is based on the method of linear array and circular arc array, which can only measure the noise direction of one side or a single plane. If you want to obtain the noise data of multiple observation points on different planes, you need to perform multiple measurements, so This array form has shortcomings in terms of measurement range and measurement efficiency for rotor blade noise with complex directivity.

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