Propeller signatures and their use

Johnston, J. F.; Donham, R. E.; Guinn, W. A.

doi:10.2514/6.1980-1035

Cited by 6 publications

(1 citation statement)

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“…19,20 Recent research on synchrophasing in aircraft has concentrated on active synchrophasing, using microphones and accelerometers positioned throughout the aircraft, together with adaptive optimization techniques to minimize the cabin noise and vibration over a wider range of flight conditions. 21,22 Propeller Signature Theory 23 has been employed to determine the optimum synchrophasing angles.…”

Section: Introductionmentioning

confidence: 99%

Combining active control and synchrophasing for vibration isolation of a floating raft system: An experimental demonstration

Yang

et al. 2020

Journal of Low Frequency Noise, Vibration and Active Control

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Vibration isolation of a floating raft system typically found in a marine application is of concern in this paper. Housed on the raft are electrical motors each driving two counter rotating shafts with eccentric masses attached. An experimental study is described in which vibration transmitted to a large-scale, laboratory-based hull-like structure is attenuated by using three measures. They are, the use of vibration isolators between the raft and the hull-like structure, adjustment of the phase of the electrical supply between the motors to minimize vibration transmitted through the isolators, and the application of an active vibration control system using hydraulic actuators placed in parallel with the isolators. The results show that this combination of measures is extremely effective at reducing the vibration transmission to the hull-like structure, and consequent reduction the sound radiation. It is more effective than the application of any of the vibration control measures applied by themselves.

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Section: Introductionmentioning

confidence: 99%

Combining active control and synchrophasing for vibration isolation of a floating raft system: An experimental demonstration

Yang

et al. 2020

Journal of Low Frequency Noise, Vibration and Active Control

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Attenuation of Propeller-Related Vibration and Noise

Johnston

Donham

1982

Journal of Aircraft

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The potential sources and paths by which the propeller produces structural responses resulting in vibration and noise in the cabin of a transport aircraft are discussed. New low-cost, convenient experimental and analytical techniques are described for evaluating the excitations-propeller airborne pressures on the fuselage shells, slip-stream-induced forces on the wing and tail, and oscillatory forces on the propeller. The techniques described make use of ground-determined structural signatures to relate forces with vibrations or noise, and of propeller signatures from flight tests which define the vibroacoustic contributions of individual propellers. Knowing these, the propeller-produced excitation forces can be deduced by the relations shown; design approaches to control the fatigue and vibroacoustic environment can then be enunciated logically.

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Review of recent research of interior noise of propeller aircraft

Mixson

Powell

1984

9th Aeroacoustics Conference

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Propeller signatures and their use

Cited by 6 publications

References 0 publications

Combining active control and synchrophasing for vibration isolation of a floating raft system: An experimental demonstration

Combining active control and synchrophasing for vibration isolation of a floating raft system: An experimental demonstration

Attenuation of Propeller-Related Vibration and Noise

Review of recent research of interior noise of propeller aircraft

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