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Periodic microstructure noise reduction device and noise suppression test system and method

A noise suppression and testing system technology, applied in the field of aerodynamic noise reduction, can solve the problems of lack of engineering practical noise reduction measures, poor noise reduction effect of noise reduction structure, poor engineering practicability, etc., and achieve strong engineering implementability , Reliable noise reduction effect, and wide range of applicable speeds

Active Publication Date: 2021-10-19
LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, active control needs to be assisted by a relatively complex mechanical device, which is not easy to operate, complex in structure, and high in cost
[0004] At present, there is still a lack of engineering practical, low-cost, reliable and effective noise reduction measures, and there is no systematic research on the law of a certain structural parameter for aerodynamic noise suppression of blunt body cylindrical structures, resulting in poor noise reduction effects of the designed noise reduction structure or Poor engineering practicability

Method used

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  • Periodic microstructure noise reduction device and noise suppression test system and method
  • Periodic microstructure noise reduction device and noise suppression test system and method
  • Periodic microstructure noise reduction device and noise suppression test system and method

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Embodiment 1

[0046]This embodiment proposes a new periodic microstructure noise reduction device for noise suppression, and conducts multi-parameter noise reduction effect research on the periodic microstructure noise reduction device through a special acoustic wind tunnel, analyzes and compares the added The wind noise spectrum and A-weighted total sound pressure level before and after noise suppression measures provide reliable data support and suggestions for cylindrical blunt body noise reduction measures.

[0047] Specific as figure 1 As shown, the periodic microstructure noise reduction device of this embodiment includes a reference cylinder 4-1, on which a radial protruding structure 4-2 is periodically arranged in the axial direction on the reference cylinder 4-1, wherein the reference cylinder The diameter of 4-1 is D, the length of the reference cylinder 4-1 is L; the outer diameter of the radial protrusion structure 4-2 is A, the setting period is S, and the thickness is B.

[...

Embodiment 2

[0050] This embodiment proposes a noise suppression test system for researching the noise reduction performance of the periodic microstructure noise reduction device proposed in the above embodiment 1 under different structural types, specifically as figure 2 As shown, the test device of this embodiment includes a wind tunnel 1 , a noise sensor 5 and a model test piece 4 .

[0051] The model test piece 4 of this embodiment is the periodic microstructure noise reduction device proposed in the above-mentioned embodiment 1.

[0052] Both the model test piece 4 and the noise sensor 5 of this embodiment are installed in the wind tunnel 1 .

[0053] The wind tunnel 1 of this embodiment adopts a 0.55m×0.4m acoustic anechoic wind tunnel 1, and connecting devices are respectively arranged on both sides of the nozzle 2 of the wind tunnel 1. Installed between the two side plates 3. In this embodiment, two side plates are arranged at the flange of the nozzle 2, one is used to fix the m...

Embodiment 3

[0058] In this embodiment, the test system proposed in the above-mentioned embodiment 2 is used for testing and analysis, and the specific process includes:

[0059] Each of the pre-prepared model test pieces in different parameter states is tested under different test conditions to obtain noise test data;

[0060] Based on the analysis of noise test data, the noise reduction effect and noise suppression ability of the model test piece under different test conditions and different parameter states are obtained.

[0061] In this embodiment, model test pieces with various parameter states can be pre-prepared in the following manner:

[0062] (1) Keeping the diameter D of the cylinder, the length L of the cylinder, the period S of the radial protrusion structure, and the thickness B of the radial protrusion structure unchanged, changing the outer diameter A of the radial protrusion structure, and preparing various models test piece;

[0063] (2) Keeping the diameter D of the cy...

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Abstract

The invention discloses a periodic microstructure noise reduction device and a noise suppression test system and method. The test system comprises a silencing wind tunnel, noise sensors and a model test piece. The model test piece adopts a periodic microstructure noise reduction device and is arranged in the silencing wind tunnel; the periodic microstructure noise reduction device comprises a reference cylinder, radial protruding structures are periodically arranged on the reference cylinder in the axial direction, the diameter of the reference cylinder is D, the length of the reference cylinder is L, the setting period is S, the outer diameter of each radial protruding structure is A, and the thickness of each radial protruding structure is B; and the plurality of noise sensors are arranged in the silencing wind tunnel in an arc-shaped array manner along the airflow direction by taking the center of the model test piece as a circle center. According to the test system provided by the invention, the noise generated by the airflow on the model is acquired through the plurality of noise sensors, and the change of a noise single-tone signal and an overall broadband signal is analyzed, so that a research basis is provided for noise suppression.

Description

technical field [0001] The invention belongs to the technical field of aerodynamic noise reduction, and in particular relates to a periodic microstructure noise reduction device, a noise suppression test system and a method. Background technique [0002] At present, wind-induced noise is a common noise pollution, which widely exists in people's lives, such as aircraft landing gear in aviation, power lines blown by strong winds, fixed ropes of bridge structures, and towers of wind turbines, etc. It is one of the sources of noise pollution caused by common blunt body rods, which has a great impact on the surrounding residents and animals. In order to suppress airflow separation, vortex shedding noise, and improve its aerodynamic performance as much as possible, many scholars have studied a variety of active and passive noise control methods. [0003] The classic active noise control methods include blowing and sucking fluid (generating secondary flow), injecting plasma, etc. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/04G01M9/06G01M9/08
CPCG01M9/04G01M9/06G01M9/08
Inventor 仝帆郝南松王大庆陈正武王勇魏春华岳廷瑞曾波王超温乾黄奔王俊娇冯和英
Owner LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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