GLTRS--Glenn
TITLE AND SUBTITLE:
Optimum Climb to Cruise Noise Trajectories for the High Speed Civil Transport

AUTHOR(S):
Jeffrey J. Berton

REPORT DATE:
November 2003

FUNDING NUMBERS:
WBS-22-714-01-39

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
John H. Glenn Research Center at Lewis Field
Cleveland, Ohio 44135-3191

PERFORMING ORGANIZATION REPORT NUMBER:
E-14214

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, DC 20546-0001

REPORT TYPE AND DATES COVERED:
Technical Memorandum

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA TM-2003-212704

SUPPLEMENTARY NOTES:
This research is as originally published as HSR050 in January 1997. Responsible person, Jeffrey J. Berton, organization code 2400, 216-977-7031.

ABSTRACT:
By entraining large quantities of ambient air into advanced ejector nozzles, the jet noise of the proposed High Speed Civil Transport (HSCT) is expected to be reduced to levels acceptable for airport-vicinity noise certification. Away from the airport, however, this entrained air is shut off and the engines are powered up from their cutback levels to provide better thrust for the climb to cruise altitude. Unsuppressed jet noise levels propagating to the ground far from the airport are expected to be high. Complicating this problem is the HSCT's relative noise level with respect to the subsonic commercial fleet of 2010, which is expected to be much quieter than it is today after the retirement of older, louder, domestic stage II aircraft by the year 2000. In this study, the classic energy state approximation theory is extended to calculate trajectories that minimize the climb to cruise noise of the HSCT. The optimizer dynamically chooses the optimal altitude-velocity trajectory, the engine power setting, and whether the ejector should be stowed or deployed with respect to practical aircraft climb constraints and noise limits.

SUBJECT TERMS:
Jet aircraft noise; Noise reduction; Noise prediction (aircraft); Trajectory optimization

NUMBER OF PAGES:
63

PDF AVAILABLE FROM URL:
2003/TM-2003-212704.pdf ( 1,896 KB )
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