Facing rim cavities fluctuation modes

Casalino, Damiano; Ribeiro, Andre F.; Fares, Ehab

doi:10.1016/j.jsv.2014.01.028

Cited by 56 publications

(33 citation statements)

References 31 publications

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“…The tones are generated by the interaction of the shear layer between the wheels with the acoustic resonance of the rim cavities. These two tones were further investigated numerically by Casalino et al [13], who found that the first tone was related to a plane wave corresponding to the floor-to-floor cavity 50 distance, while the second tone was from an azimuthal mode of the wheel cavities [13]. Zhang et al [14] performed aerodynamic and aeroacoustic experiments of an isolated high-fidelity landing gear wheel including a tyre, a sidewall, a hub, a hub cavity and rim cavities.…”

Section: Introductionmentioning

confidence: 99%

The noise generated by a landing gear wheel with hub and rim cavities

Wang

Angland

Zhang

2017

Journal of Sound and Vibration

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Wheels are one of the major noise sources of landing gears. Accurate numerical predictions of wheel noise can provide an insight into the physical mechanism of landing gear noise generation and can aid in the design of noise control devices. The major noise sources of a 33% scaled isolated landing gear wheel are investigated by simulating three different wheel configurations using high-order numerical simulations to compute the flow field and the FW-H equation to obtain the far-field acoustic pressures. The baseline configuration is a wheel with a hub cavity and two rim cavities. Two additional simulations are performed; one with the hub cavity covered (NHC) and the other with both the hub cavity and rim cavities covered (NHCRC).

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Section: Introductionmentioning

confidence: 99%

The noise generated by a landing gear wheel with hub and rim cavities

Wang

Angland

Zhang

2017

Journal of Sound and Vibration

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“…The shear layers excite half-wavelength-depth modes between these surfaces. In the ALLEGRA NLG, these lengths are approximately l FF 0.33 m and l EE 0.16 m. Using the correction factors of 0.82 and 1.11 determined by Marsden et al [36] and Casalino et al [32], which account for the geometrical differences between the wheel assembly and a pure annular cavity in a flat plate, frequencies of f FF 344∕2 0.33 0.82 636 Hz and f EE 344∕2 0.16 1.11 968 Hz are determined. These values are very close indeed to frequencies where high levels of noise are measured in Fig.…”

Section: Effect Of the Wheels: Nlg-dresswmentioning

confidence: 95%

“…Our far-field linear array is well placed to detect such tones. A numerical study of these noise sources was performed by Casalino et al [32] using a lattice Boltzmann method. They examined the interwheel area and found that the shear layer that forms over the wheel rims excites acoustic depth and azimuthal modes between and within the rims, which can result in acoustic radiation to the far field.…”

Section: Effect Of the Wheels: Nlg-dresswmentioning

confidence: 99%

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Noise Characterization of a Full-Scale Nose Landing Gear

Bennett

Neri

Kennedy

2018

Journal of Aircraft

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This paper presents experimental results from a nose landing-gear test campaign. A highly detailed model of the nose section of a 90-seat configuration green regional aircraft concept was built and tested in an aeroacoustic open-jet wind tunnel at full scale. All of the landing-gear components, fixtures, and small details and associated structures such as the complete wheel bay, bay doors, and hydraulic dressings were included at full scale. This paper focuses on one element of the testing: that of component noise assessment. The dressings, wheels, torque link, steering pinion, bay doors, and then the main strut and drag stay were removed in succession, and an acoustic evaluation was performed at a range of velocities from M 0.12 to M 0.19. In addition, hub caps were installed on the wheels, and their performance as a low-noise treatment is presented and assessed for efficacy. The landing gear, doors, and bay generated most noise in the frequency range between 120 and 400 Hz, but appreciable noise above the baseline was measured up to 10 kHz. The low-to midfrequency aerodynamic noise was found to scale with V 6 , as usual; however, the spectra at high frequencies collapsed perfectly when scaled to V 7 , confirming the fact that high-frequency noise is radiated from the turbulent flow surrounding small features. The total noise output of the landing-gear assembly differs from that of the sum of the components in isolation due to installation effects. The research in this paper studied these effects and the influence of the components on each other.

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“…2,3 Several experimental and numerical tests have been performed to study the flow features and far-field acoustics of landing gear wheels. Casalino et al 4 numerically investigated the noise from two facing wheels with rim cavities on the LAGOON (LAnding Gear nOise database for CAA validatiON) 5 landing gear geometry. Two tonal peaks were found in the sideline direction due to the wheel cavity resonances.…”

Section: Introductionmentioning

confidence: 99%

Interaction Noise from Tandem Landing Gear Wheels with Hub and Rim Cavities

Wang

Angland

Scotto

2017

23rd AIAA/CEAS Aeroacoustics Conference

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Wheels are major noise sources on landing gears. Accurate numerical predictions of wheel noise can provide insights into landing gear noise generation mechanisms and help improve landing gear noise prediction models. Previous simulations have been conducted on an isolated high-fidelity wheel model containing a tyre, a hub, a sidewall and two rim cavities. The hub cavity was an important middle frequency noise source due to the first and second hub cavity depth modes, and the rim cavities were major high frequency noise sources. This work investigates the major noise sources in different frequency ranges of two tandem wheels, with the same geometry as the previous isolated wheel case, by performing high-order numerical simulations at M = 0.23. This paper focuses on the mechanisms and characteristics of the wheel interaction noise. The aerodynamic results are validated against experiments and demonstrate reasonable agreements. The flow interactions are found to be mainly in the side direction with a spectral peak in the side force at a Strouhal number of 0.19, based on the wheel width, which is due to a flapping shear layer mode in the gap. The downstream wheel is the major noise source and has a favourable sound radiation direction to the sideline. The effects of the downstream wheel hub and rim cavities are isolated by covering them in the simulations. The flow interactions dominate the hub cavity depth modes in the generation of middle frequency downstream wheel noise. For high frequency noise, covering both the hub and rim cavities on the downstream wheel only, reduced the noise radiated towards the ground. This high frequency noise reduction was not achieved when the hub cavity alone was covered.

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Facing rim cavities fluctuation modes

Cited by 56 publications

References 31 publications

The noise generated by a landing gear wheel with hub and rim cavities

The noise generated by a landing gear wheel with hub and rim cavities

Noise Characterization of a Full-Scale Nose Landing Gear

Interaction Noise from Tandem Landing Gear Wheels with Hub and Rim Cavities

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