Investigation of sound field uniformity for multisourced traveling wave tube

Zheng Ling, Meng Fantong, Deng Jie, Yan Tingfei, Wu Yao

Producció científica: Capítol de llibreContribució a congrés/conferènciaAvaluat per experts

Resum

Acoustic environment test has to be completed in the ground to ensure the reliability and life for satellites and other aerospace structures in space. Traveling wave tubes (TWT) are often adopted to. achieve required acoustic environment in the ground attributed to its high sound intensity in the tube. However, the distortion and nonlinearity caused by large amplitude acoustic wave propagation make it difficult to control the noise spectrum accurately and maintain the uniform acoustic field distribution. In this paper, numerical simulation based on Comsol Mutiphysics software is developed to investigate three-dimensional large amplitude sound wave propagation and the acoustic field uniformity in the tube. The sound sources are applied separately or together at the center frequency of 1/3 octave frequency spectrum in order to demonstrate the acoustic field uniformity in different operating conditions. Moreover, energy superposition of acoustic field generated by each sound source at each center frequency is completed to calculate the acoustic field distribution in the tube. The boundary impedance at the end is fixed according to the corresponding experimental conditions and numerical simulation results are consistent with acoustic waveguide theory. Multiple sources can improve acoustic field uniformity substantially in the traveling wave tube and the contribution of each source to sound pressure level of specific field points is different.

Idioma originalAnglès
Títol de la publicacióProceedings of the 26th International Congress on Sound and Vibration, ICSV 2019
EditorCanadian Acoustical Association
ISBN (electrònic)9781999181000
Estat de la publicacióPublicada - 2019
Publicat externament
Esdeveniment26th International Congress on Sound and Vibration, ICSV 2019 - Montreal, Canada
Durada: 7 de jul. 201911 de jul. 2019

Sèrie de publicacions

NomProceedings of the 26th International Congress on Sound and Vibration, ICSV 2019

Conferència

Conferència26th International Congress on Sound and Vibration, ICSV 2019
País/TerritoriCanada
CiutatMontreal
Període7/07/1911/07/19

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