Add to ORKGThe study of noise from a two-shaft contra-rotating open rotor (CROR) is challenging since the shafts are not phase locked in most cases. Consequently, phase averaging of the acoustic data keyed to a single shaft rotation speed is not meaningful. An unaligned spectrum procedure that was developed to estimate a signal coherence threshold and reveal concealed spectral lines in turbofan engine combustion noise is applied to fan and CROR acoustic data in this paper
The 9- by 15-Foot Low Speed Wind Tunnel has been used for acoustic testing for more than 40 years. T...
Counter-Rotating Open Rotors (CROR) have advantageous propulsion efficiencies as compared to turbof...
Results of recent NASA research to reduce aircraft turbofan noise are described. As the bypass ratio...
The study of noise from a two-shaft contra-rotating open rotor (CROR) is challenging since the shaft...
The study of combustion noise from turbofan engines has become important again as the noise from oth...
This work is a first look at acoustic data acquired in the NASA Glenn Research Center Aero-Acoustic ...
Renewed interest in contra-rotating open rotor technology for aircraft propulsion application has pr...
The term “open rotor” refers to unducted counter-rotating dual rotors or propellers used for propuls...
Contributions from the combustor to the overall propulsion noise of civilian transport aircraft are ...
Reliable prediction of contra-rotating open rotor (CROR) noise is an essential element of any strate...
Phased array beamforming results of the F31/A31 historical baseline counter-rotating open rotor blad...
Qualitative and quantitative spectral analyses are presented that give the broadband-noise, discrete...
Owing to their inherent fuel efficiency, there is renewed interest in developing open rotor propulsi...
Renewed interest in contra-rotating open rotor technology for aircraft propulsion application has pr...
An experimental measurement system was developed and implemented by the NASA Glenn Research Center i...
The 9- by 15-Foot Low Speed Wind Tunnel has been used for acoustic testing for more than 40 years. T...
Counter-Rotating Open Rotors (CROR) have advantageous propulsion efficiencies as compared to turbof...
Results of recent NASA research to reduce aircraft turbofan noise are described. As the bypass ratio...
The study of noise from a two-shaft contra-rotating open rotor (CROR) is challenging since the shaft...
The study of combustion noise from turbofan engines has become important again as the noise from oth...
This work is a first look at acoustic data acquired in the NASA Glenn Research Center Aero-Acoustic ...
Renewed interest in contra-rotating open rotor technology for aircraft propulsion application has pr...
The term “open rotor” refers to unducted counter-rotating dual rotors or propellers used for propuls...
Contributions from the combustor to the overall propulsion noise of civilian transport aircraft are ...
Reliable prediction of contra-rotating open rotor (CROR) noise is an essential element of any strate...
Phased array beamforming results of the F31/A31 historical baseline counter-rotating open rotor blad...
Qualitative and quantitative spectral analyses are presented that give the broadband-noise, discrete...
Owing to their inherent fuel efficiency, there is renewed interest in developing open rotor propulsi...
Renewed interest in contra-rotating open rotor technology for aircraft propulsion application has pr...
An experimental measurement system was developed and implemented by the NASA Glenn Research Center i...
The 9- by 15-Foot Low Speed Wind Tunnel has been used for acoustic testing for more than 40 years. T...
Counter-Rotating Open Rotors (CROR) have advantageous propulsion efficiencies as compared to turbof...
Results of recent NASA research to reduce aircraft turbofan noise are described. As the bypass ratio...