Evaluation of interior noise control treatments for advanced turboprop aircraft

Prydz, R. A.; Revell, J. D.; Balena, F. J.

doi:10.2514/3.45159

Cited by 1 publication

(1 citation statement)

References 10 publications

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“…Most of the aeroengine noise researches focused on the noise sources identification and the evaluation of the noise reduction performance. 4–12 Almost nobody identified the aeroengine status information and diagnosed the aeroengine fault utilizing the noise signal. Magliozzi, 4 Prydz et al., 5 Knowles, 6 Wilby and Wilby, 7 Emborg et al., 9 Kochan et al., 10 and Schulz and Laube 11 collected and analyzed the noise of different types of turboprop engines, identified the noise sources, and gained the frequency spectrum characteristic of broadband.…”

Section: Introductionmentioning

confidence: 99%

Noise analysis of the turbojet and turbofan engine tests

Huang

Zheng

2013

Proceedings of the Institution of Mechanical Engineers, Part G:

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Aerogine noise leads to environment pollution largely when aerogine is tested. In this paper, the power spectrum analysis method of the aeroengine test noise was discussed, and the noise measurement and analysis experiments of a turbojet engine and a turbofan engine tests were carried out. The noise level, main noise resource, and noise characteristics of the two turbojet and turbofan engines were analyzed. Meanwhile, the indoor noise and far-field noise of the turbojet engine were both measured, the noise spread characteristics were analyzed and the noise reduction performance of the test bench was evaluated. The noise generated by the turbojet engine test had the discrete characteristic of high frequency. The higher frequencies when peak values occurred were the blade passage frequencies and the noises with lower frequencies were the broad band noises, especially the jet noise, and the maximum of the peak values occurred at the basic frequencies or harmonic frequencies of the compressor. Meanwhile, the noises generated by the turbofan engine, focused on the high frequencies and the peak values corresponded to the rotation noise of the fan blades. The experimental results were consistent with the theory basically, which indicated that the aeroengine operating status information could be identified by the noise power spectrum analysis. In addition to the aeroengine noise reduction research, the noise power spectrum analysis could also be used to diagnose the fault of the aeroengine structure and performance. On the other hand, the indoor and far-field noise measurement experimental results implied that the noise was suppressed from 136 dB to 85 dB and could provide the reference to the noise reduction design of the aeroengine test bench.

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