Download or read book Piloted Simulation Study of the Effects of High Lift Aerodynamics on the Takeoff Noise of a Representative High Speed Civil Transport written by and published by . This book was released on 1999 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Piloted Simulation Study of the Effects of High Lift Aerodynamics on the Takeoff Noise of a Representative High Speed Civil Transport written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-09-20 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: As part of an effort between NASA and private industry to reduce airport-community noise for high-speed civil transport (HSCT) concepts, a piloted simulation study was initiated for the purpose of predicting the noise reduction benefits that could result from improved low-speed high-lift aerodynamic performance for a typical HSCT configuration during takeoff and initial climb. Flight profile and engine information from the piloted simulation were coupled with the NASA Langley Aircraft Noise Prediction Program (ANOPP) to estimate jet engine noise and to propagate the resulting source noise to ground observer stations. A baseline aircraft configuration, which also incorporated different levels of projected improvements in low-speed high-lift aerodynamic performance, was simulated to investigate effects of increased lift and lift-to-drag ratio on takeoff noise levels. Simulated takeoff flights were performed with the pilots following a specified procedure in which either a single thrust cutback was performed at selected altitudes ranging from 400 to 2000 ft, or a multiple-cutback procedure was performed where thrust was reduced by a two-step process. Results show that improved low-speed high-lift aerodynamic performance provides at least a 4 to 6 dB reduction in effective perceived noise level at the FAA downrange flyover measurement station for either cutback procedure. However, improved low-speed high-lift aerodynamic performance reduced maximum sideline noise levels only when using the multiple-cutback procedures.Glaab, Louis J. and Riley, Donald R. and Brandon, Jay M. and Person, Lee H., Jr. and Glaab, Patricia C.Langley Research CenterPILOT SUPPORT SYSTEMS; COMPUTERIZED SIMULATION; TAKEOFF; NOISE INTENSITY; AERODYNAMIC NOISE; AIRCRAFT CONFIGURATIONS; NOISE PREDICTION (AIRCRAFT); NOISE REDUCTION; LIFT; JET AIRCRAFT NOISE; HIGH SPEED; CIVIL AVIATION; FLIGHT PATHS; GROUND STATIONS; DOWNRANGE MEASUREMENT
Download or read book Piloted Simulation Assessment of a High Speed Civil Transport Configuration written by and published by . This book was released on 2002 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: An assessment of a proposed configuration of a high-speed civil transport was conducted by using NASA and industry research pilots. The assessment was conducted to evaluate operational aspects of the configuration from a pilot's perspective, with the primary goal being to identify potential deficiencies in the configuration. The configuration was evaluated within and at the limits of the design operating envelope to determine the suitability of the configuration to maneuver in a typical mission as well as in emergency Or envelope-limit conditions. The Cooper-Harper rating scale was used to evaluate the flying qualities of the configuration. A summary flying qualities metric was also calculated. The assessment was performed in the Langley six-degree-of-freedom Visual Motion Simulator. The effect of a restricted cockpit field-of-view due to obstruction by the vehicle nose was not included in this study.
Download or read book Piloted Simulation Study of a Dual Thrust Cutback Procedure for Reducing High Speed Civil Transport Takeoff Noise Levels written by and published by . This book was released on 1999 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: A piloted simulation study was performed for the purpose of indicating the noise reduction benefits and piloting performance that could occur for a typical 4-engine high-Speed Civil Transport (HSCT) configuration during takeoff when a dual thrust-cutback procedure was employed with throttle operation under direct computer control. Two thrust cutbacks were employed with the first cutback performed while the vehicle was accelerating on the run-way and the second cutback performed at a distance farther downrange. Added vehicle performance improvements included the incorporation of high-lift increments into the aerodynamic database of the vehicle and the use of limited engine oversizing. Four single-stream turbine bypass engines that had no noise suppression of any kind were used with this configuration. This approach permitted establishing the additional noise suppression level that was needed to meet Federal Air Regulation Part 36 Stage 3 noise levels for subsonic commercial jet aircraft. Noise level results were calculated with the jet mixing and shock noise modules of the Aircraft Noise Prediction Program (ANOPP).
Download or read book Piloted Simulation Study of a Dual Thrust Cutback Procedure for Reducing High Speed Civil Transport Takeoff Noise Levels written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-03 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: A piloted simulation study was performed for the purpose of indicating the noise reduction benefits and piloting performance that could occur for a typical 4-engine high-Speed Civil Transport (HSCT) configuration during takeoff when a dual thrust-cutback procedure was employed with throttle operation under direct computer control. Two thrust cutbacks were employed with the first cutback performed while the vehicle was accelerating on the run-way and the second cutback performed at a distance farther downrange. Added vehicle performance improvements included the incorporation of high-lift increments into the aerodynamic database of the vehicle and the use of limited engine oversizing. Four single-stream turbine bypass engines that had no noise suppression of any kind were used with this configuration. This approach permitted establishing the additional noise suppression level that was needed to meet Federal Air Regulation Part 36 Stage 3 noise levels for subsonic commercial jet aircraft. Noise level results were calculated with the jet mixing and shock noise modules of the Aircraft Noise Prediction Program (ANOPP).Riley, Donald R. and Glaab, Louis J. and Brandon, Jay M. and Person, Lee H., Jr. and Glaab, Patricia C.Langley Research CenterSIMULATION; TAKEOFF; AERODYNAMIC NOISE; NOISE REDUCTION; HIGH SPEED; CIVIL AVIATION; LIFT; DATA BASES; JET MIXING FLOW; COMMERCIAL AIRCRAFT; SUPERSONIC TRANSPORTS; NUMERICAL CONTROL; NOISE PREDICTION (AIRCRAFT)
Download or read book Initial Piloted Simulation Evaluation of the Reference H High Speed Civil Transport Design During Takeoff and Recovery From Limit Flight Conditions written by and published by . This book was released on 1999 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Langley Scientific and Technical Information Output 1999 written by and published by . This book was released on 2000 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental and Numerical Optimization of a High Lift System to Improve Low Speed Performance Stability and Control of an Arrow Wing Supersonic Transport written by David Edgar Hahne and published by . This book was released on 1999 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1994 with total page 842 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Vortex Flaps and Other Flow Control Devices on Generic High Speed Civil Transport Planforms written by and published by . This book was released on 1999 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research and Technology Objectives and Plans Summary written by and published by . This book was released on with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A compilation of the summary portions of each of the RTOPs used for management review and control of research currently in progress throughout NASA"--P. i.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sound Barrier written by Neville Duke and published by . This book was released on 1955 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Noise Impact of Advanced High Lift Systems written by and published by . This book was released on 1995 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Innovation in Flight written by Joseph R. Chambers and published by . This book was released on 2005 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optimum Climb to Cruise Noise Trajectories for the High Speed Civil Transport written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-03 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.Berton, Jeffrey J.Glenn Research CenterCIVIL AVIATION; SUPERSONIC TRANSPORTS; JET AIRCRAFT NOISE; CLIMBING FLIGHT; TRAJECTORY OPTIMIZATION; CRUISING FLIGHT; AIRCRAFT DESIGN; EJECTORS; NOISE REDUCTION; AIRPORTS; ENTRAINMENT; EXHAUST NOZZLES; ALTITUDE
Download or read book Engine Installation Effects of Four Civil Transport Airplanes written by U.s. Department of Transportation and published by CreateSpace. This book was released on 2013-12 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report examines the effects of airplane geometrical configuration on the acoustic directivity characteristics and on the propagation of airplane noise. This effect of airplane geometry is referred to in this report as “engine installation effects.” Engine installation effects are one of the components of lateral attenuation. Lateral attenuation in the Federal Aviation Administration's (FAA) Integrated Noise Model (INM) has been based on the methods described in the Society of Automotive Engineers' (SAE) Aerospace Information Report (AIR) 1751. Released in 1981, SAE-AIR-1751 is founded on data measured in the 1960s and 1970s. The Boeing B-727 airplane, which has an engine location not used on more modern large civil transports, dominated these measurements. Long-term measurements conducted with airport noise monitoring equipment have shown that the lateral attenuation algorithms in SAE-AIR-1751 tend to predict too much attenuation for modern airplanes.
