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Acoustic measurement device and method suitable for blade grid rectangular pipeline outlet

A measuring device, rectangle technology, applied in the direction of measuring device, testing of mechanical parts, testing of machine/structural parts, etc., can solve the problem of noise reduction design of difficult bionic blades, unable to study the effect of sound wave radiation from the root, unable to accurately Obtain the size of the acoustic modal components, etc., to achieve the effect of improving the scope of application

Pending Publication Date: 2022-02-22
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

Although this method can obtain the acoustic performance of different cascades and the noise reduction effect of different bionic blades, it cannot fundamentally study the radiation effect of sound waves in the pipeline, nor can it accurately obtain each acoustic mode component. further, it is difficult to guide the noise reduction design of bionic blades in depth

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  • Acoustic measurement device and method suitable for blade grid rectangular pipeline outlet
  • Acoustic measurement device and method suitable for blade grid rectangular pipeline outlet
  • Acoustic measurement device and method suitable for blade grid rectangular pipeline outlet

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Embodiment Construction

[0063] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0064] The present invention aims at the deficiencies and difficulties of the cascade pipe acoustic measurement device and technology, and aims to provide an acoustic measurement device and method suitable for the outlet of the cascade rectangular pipe to overcome or solve the above technical difficulties.

[0065] Such as figure 1 As shown, an acoustic measurement device suitable for the outlet of a cascade rectangular duct, including a cascade test section 1 and an acoustic measurement section 2;

[0066] Such as Figure 2 to Figure 3 The cascade test section 1 includes a blade cover plate 3, a first connecting flange 5, a second connecting flange 6, a blade 7 and a blade installation groove 8; the first connecting flange 5 and the second connecting flange 6 respectively arranged at both ends of the cascade test section 1; the first connecting flang...

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Abstract

The invention discloses an acoustic measurement device and method suitable for a blade grid rectangular pipeline outlet. The acoustic measurement device comprises a blade grid experiment section and an acoustic measurement section. The blade grid experiment section is composed of two blade cover plates, a probe measuring groove, two connecting flanges, a plurality of blades, a blade mounting groove and a cylinder mounting groove. The acoustic measurement section is composed of two identical connecting flanges and a rectangular measurement section. A plurality of threaded holes are distributed in the acoustic measurement section and used for installing microphone probes, and acoustic signal collection at different positions of an outlet of the rectangular pipeline of the blade grid can be achieved. According to the method, the collected acoustic signals can be utilized to realize sound field reconstruction of the blade grid rectangular pipeline outlet, and the noise reduction effects of different blades can be quantitatively analyzed and researched from the aspect of modality. According to the invention, the application range of the blade grid acoustic experiment can be expanded, the bionic blade parameterized acoustic experiment can be more deeply carried out from the aspect of pipeline acoustics, and the bionic blade parameterized design can be guided.

Description

technical field [0001] The invention belongs to the technical field of acoustic measurement, and in particular relates to an acoustic measurement device and method for a pipeline outlet. Background technique [0002] For turbomachinery such as aero-engines, compressors, and fans, the main noise sources are the dipole noise sources on the blade surface and the quadrupole noise sources generated by the turbulent flow around them. The noise generated by these noise sources will be transmitted to the external environment through the inlet or outlet pipes, which has a serious impact on the life and work of the surrounding residents and factory workers. In order to reduce noise, we need to start from two aspects: 1. Reduce the sound wave radiation energy from the noise propagation path; 2. Reduce the noise source intensity. After years of research, the research on the first method has been very in-depth. Although the effect is remarkable, it has also encountered bottlenecks and i...

Claims

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Application Information

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IPC IPC(8): G01M13/00G01H17/00
CPCG01M13/00G01H17/00Y02T90/00
Inventor 同航陶孟尧连健欣陈伟杰乔渭阳
Owner NORTHWESTERN POLYTECHNICAL UNIV
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