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| Experimental Investigation on Noise Reduction of Double Rotating Propellers |
| Received:March 05, 2019 Revised:July 25, 2019 |
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| DOI：10.7643/ issn.1672-9242.2019.07.004 |
| KeyWord:propeller noise interference of dual-propeller noise reduction airframe noise |
| Author | Institution |
| WANG Long |
Aircraft Strength Research Institute of China, Xi′an , China |
| YAN Qun |
Aircraft Strength Research Institute of China, Xi′an , China |
| XUE Dong-wen |
Aircraft Strength Research Institute of China, Xi′an , China |
| WEI Kai |
Aircraft Strength Research Institute of China, Xi′an , China |
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| Abstract: |
| Objective To investigate the noise reduction of acoustic wave interference produced by double rotating propellers (AWIDRP) on airframe surface. Methods In this paper, an experimental platform was designed and build by simulating the symmetrically arrangement of two propellers on both sides of airframe. The airframe was approximated by a cylindrical shell and the propellers were driven by servo motors. When the propellers were rotating, sound pressure levels (SPL) on the airframe surface were measured. According to the measuring data, the SPL distribution law of airframe was obtained. By comparing the SPL of each measuring point under the condition of single-propeller rotation and double-propeller rotation, the noise reduction of AWIDRP on airframe surface was verified. Results The double-propeller rotation has apparent noise reduction effect, especially at the 45° measuring point of the airframe. Compare with single-propeller rotation, the SPL of the most areas on airframe surface was decreased in AWIDRP state. The max noise reduction was 1.84 dB at 45°measuring point. The SPL at 0° measuring point was re-duced by 1.58dB. The SPL at 90° measuring point on the airframe was increased by 0.29 dB. Conclusion In state of AWIDRP, the SPL in the main area on airframe surface is decreased, only increased in a few areas. The AWIDRP was effective in noise reduction on airframe. |
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