Open Rotor Engines—Still an Open Question?

Langston, Lee S.

doi:10.1115/1.2018-dec-9

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…Commercial aviation companies have investigated novel concepts of aircraft propulsion aimed at reducing fuel burn and improving overall aircraft performance. These new designs contemplate the possibility of using open rotor engines (also called propfan or unducted fan), with less noise and emission levels (Schimming 2003;Negulescu 2013;Van Zante et al 1968;Van Zante 2015;Brouckaert et al 2018;Langston 2018). In this aircraft concept, the engine system is generally located in the rear part of the aircraft, with the required redesign and sizing of the fuselage.…”

Section: Aircraft Tail Fuselagementioning

confidence: 99%

Probability-damage approach for fail-safe design optimization (PDFSO)

Cid

Baldomir

Hernández

2020

Struct Multidisc Optim

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Fail-safe design often leads to oversized structures as the design must be able to behave properly for the different accidental situations that could undergo throughout their lifespan. The existing research about structural optimization applied to fail-safe design does not contemplate the idea of having accidental situations with different probabilities of occurrence. This means that the structure must satisfy the design constraints in the damaged structure regardless of whether one accidental situation is much more likely than another. The objective of this research is to formulate a new optimization strategy to get fail-safe structures with minimum weight taking into account the available data about the probability of occurrence associated to each partial collapse. A multi-model probabilistic optimization problem is defined and applied to two structures: a 2D truss structure with stress constraints as well as the tail section of an aircraft fuselage with stress and buckling constraints.

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Section: Aircraft Tail Fuselagementioning

confidence: 99%

Probability-damage approach for fail-safe design optimization (PDFSO)

Cid

Baldomir

Hernández

2020

Struct Multidisc Optim

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Sustainable aviation in the context of the Paris Agreement: A review of prospective scenarios and their technological mitigation levers

Delbecq,

Fontane,

Gourdain

et al. 2023

Progress in Aerospace Sciences

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An automated method for the identification of interaction tone noise sources on the beamforming maps of counter-rotating rotors

2022

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Counter-rotating rotor configurations are considered more efficient than their single rotor counterparts. Consequently, the coaxially aligned rotors have appeared in the fixed-wing aircraft sector and are appearing in the quickly developing unmanned aerial vehicle sector, where they are expected to play a significant role, especially for long haul and heavy load configurations. As their noise levels have proven to be rather significant, the localization and reduction of the noise of such counter-rotating blade sets is a relevant topic of interest. One of the dominant contributors to counter-rotating rotor noise is interaction tones. Interaction tones appear at combinations of the harmonics of the blade passing frequencies of the two rotors and are significant throughout the spectra. In this paper, an automated method is presented that analyzes an entire series of beamforming noise source maps using principal component analysis-based methods in order to identify the dominant noise generation mechanisms in frequency bins that are associated with interaction tones. The processing technique is presented herein through the investigation of counter-rotating open rotor datasets developed for a fixed-wing aircraft configuration. With the proposed method, an objective mean has been provided for separating apart contributions from various noise sources, which can be automated, making the processing and investigation of large sets of measurement data rather quick and easy. The method has been developed such that the results of the analysis are easy to comprehend even without specialized prior knowledge in the area of counter-rotating rotor noise.

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Open Rotor Engines—Still an Open Question?

Cited by 3 publications

References 2 publications

Probability-damage approach for fail-safe design optimization (PDFSO)

Probability-damage approach for fail-safe design optimization (PDFSO)

Sustainable aviation in the context of the Paris Agreement: A review of prospective scenarios and their technological mitigation levers

An automated method for the identification of interaction tone noise sources on the beamforming maps of counter-rotating rotors

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