Modal analysis of the influence of freestream on global rotor noise

Xu, Xice; Lu, Yang; Lu, Jiaxin; Shao, Mengxue

doi:10.1016/j.jsv.2023.117715

Cited by 6 publications

(1 citation statement)

References 26 publications

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“…Most theoretical studies on aerodynamic sound generation are theoretical calculations of aerodynamic noise in open space. It is mainly used for the acoustic generation of the aerodynamic loudspeakers, wings, rotors, and other structures in the fluid sound 5 or high-pressure jet. 6 In the 1960s and 1970s, Meyer 7 studied the acoustic principle of modulators.…”

Section: Introductionmentioning

confidence: 99%

Theoretical research on the application of impedance calculation in the design of high-intensity low-frequency acoustic generator

Zhang,

Dong,

Liang

et al. 2023

Journal of Low Frequency Noise, Vibration and Active Control

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The impedance matching is essential in producing high-intensity acoustic waves. This paper studies the impedance calculation methods of modulators and double-chamber Helmholtz resonators based on fluid mechanics, aeroacoustics, and electro-acoustic analogy principles. The results: ① The impedance expression of the resonators is derived. ② The impedance variation law of the chamber volume, the stator size, the air supply pressure, the air supply flow, and the working frequency is calculated. ③ The impedance-matching design scheme of the two-chamber Helmholtz low frequency and high acoustic intensity generator is given. Based on the experimental results of the high acoustic intensity generating device that the author has manufactured in the closed space, the correctness of the impedance calculation and matching design scheme in this paper is verified. This method has guiding significance for the design of high-intensity acoustic generating devices in confined space.

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Section: Introductionmentioning

confidence: 99%