Author: Publisher:
ISBN:
Category : Aeroacoustics
Languages : en
Pages : 0
Book Description
Assessment of NASA's Aircraft Noise Prediction Capability
Author: A Process for Assessing Nasa's Capability in Aircraft Noise Prediction Technology
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781719375481
Category :
Languages : en
Pages : 32
Book Description
An acoustic assessment is being conducted by NASA that has been designed to assess the current state of the art in NASA s capability to predict aircraft related noise and to establish baselines for gauging future progress in the field. The process for determining NASA s current capabilities includes quantifying the differences between noise predictions and measurements of noise from experimental tests. The computed noise predictions are being obtained from semi-empirical, analytical, statistical, and numerical codes. In addition, errors and uncertainties are being identified and quantified both in the predictions and in the measured data to further enhance the credibility of the assessment. The content of this paper contains preliminary results, since the assessment project has not been fully completed, based on the contributions of many researchers and shows a select sample of the types of results obtained regarding the prediction of aircraft noise at both the system and component levels. The system level results are for engines and aircraft. The component level results are for fan broadband noise, for jet noise from a variety of nozzles, and for airframe noise from flaps and landing gear parts. There are also sample results for sound attenuation in lined ducts with flow and the behavior of acoustic lining in ducts. Dahl, Milo D. Glenn Research Center AERODYNAMIC NOISE; NOISE PREDICTION; ACOUSTIC DUCTS; JET AIRCRAFT NOISE; AIRCRAFT NOISE; ACOUSTIC ATTENUATION; TECHNOLOGY ASSESSMENT; AIRCRAFT ENGINES; PROGRESS; FAN BLADES; ERRORS
Airframe Noise Studies
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781721148080
Category :
Languages : en
Pages : 142
Book Description
This report contains the following information: 1) a review of airframe noise research performed under NASA's Advanced Subsonic Transport (AST) program up to the year 2000, 2) a comparison of the year 1992 airframe noise predictions with those using a year 2000 baseline, 3) an assessment of various airframe noise reduction concepts as applied to the year 2000 baseline predictions, and 4) prioritized recommendations for future airframe noise reduction work. NASA's Aircraft Noise Prediction Program was the software used for all noise predictions and assessments. For future work, the recommendations for the immediate future focus on the development of design tools sensitive to airframe noise treatment effects and on improving the basic understanding of noise generation by the landing gear as well as on its reduction. Rackl, Robert G. and Miller, Gregory and Guo, Yueping and Yamamoto, Kingo Langley Research Center NAS1-97040; 23-781-20-12
The NASA Aircraft Noise Prediction Program Improved Propeller Analysis System
Author: L. Cathy NguyenThe NASA Aircraft Noise Prediction Program Improved Propeller Analysis System
Author: National Aeronautics and Space Adm NasaPublisher:
ISBN: 9781731041104
Category :
Languages : en
Pages : 110
Book Description
The improvements and the modifications of the NASA Aircraft Noise Prediction Program (ANOPP) and the Propeller Analysis System (PAS) are described. Comparisons of the predictions and the test data are included in the case studies for the flat plate model in the Boundary Layer Module, for the effects of applying compressibility corrections to the lift and pressure coefficients, for the use of different weight factors in the Propeller Performance Module, for the use of the improved retarded time equation solution, and for the effect of the number grids in the Transonic Propeller Noise Module. The DNW tunnel test data of a propeller at different angles of attack and the Dowty Rotol data are compared with ANOPP predictions. The effect of the number of grids on the Transonic Propeller Noise Module predictions and the comparison of ANOPP TPN and DFP-ATP codes are studied. In addition to the above impact studies, the transonic propeller noise predictions for the SR-7, the UDF front rotor, and the support of the enroute noise test program are included. Nguyen, L. Cathy Unspecified Center COMPUTER PROGRAMS; NOISE PREDICTION (AIRCRAFT); PROPELLER EFFICIENCY; PROPELLER NOISE; WIND TUNNEL TESTS; AERODYNAMIC COEFFICIENTS; BOUNDARY LAYERS; COMPRESSIBLE FLOW; FLAT PLATES; LIFT; PRESSURE RATIO; ROTORS...
Research Needs in Aircraft Noise Prediction
Author: John P. RaneyA Computer Program for Detailed Analysis of the Takeoff and Approach Performance Capabilities of Transport Category Aircraft
Author: Aircraft Noise
Author: Oleksandr ZaporozhetsPublisher: CRC Press
ISBN: 0203888820
Category : Technology & Engineering
Languages : en
Pages : 432
Book Description
Aircraft noise has adverse impacts on passengers, airport staff and people living near airports, it thus limits the capacity of regional and international airports throughout the world. Reducing perceived noise of aircraft involves reduction of noise at source, along the propagation path and at the receiver. Effective noise control demands highly s
Evaluation of the Advanced Subsonic Technology Program Noise Reduction Benefits
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781721148158
Category :
Languages : en
Pages : 112
Book Description
This report presents a detailed evaluation of the aircraft noise reduction technology concepts developed during the course of the NASA/FAA Advanced Subsonic Technology (AST) Noise Reduction Program. In 1992, NASA and the FAA initiated a cosponsored, multi-year program with the U.S. aircraft industry focused on achieving significant advances in aircraft noise reduction. The program achieved success through a systematic development and validation of noise reduction technology. Using the NASA Aircraft Noise Prediction Program, the noise reduction benefit of the technologies that reached a NASA technology readiness level of 5 or 6 were applied to each of four classes of aircraft which included a large four engine aircraft, a large twin engine aircraft, a small twin engine aircraft and a business jet. Total aircraft noise reductions resulting from the implementation of the appropriate technologies for each class of aircraft are presented and compared to the AST program goals. Golub, Robert A. and Rawls, John W., Jr. and Russell, James W. Langley Research Center 23-781-20-12
Aircraft Noise Prediction Program Propeller Analysis System Ibm-PC Version User's Manual Version 2.0
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781723511219
Category :
Languages : en
Pages : 236
Book Description
The IBM-PC version of the Aircraft Noise Prediction Program (ANOPP) Propeller Analysis System (PAS) is a set of computational programs for predicting the aerodynamics, performance, and noise of propellers. The ANOPP-PAS is a subset of a larger version of ANOPP which can be executed on CDC or VAX computers. This manual provides a description of the IBM-PC version of the ANOPP-PAS and its prediction capabilities, and instructions on how to use the system on an IBM-XT or IBM-AT personal computer. Sections within the manual document installation, system design, ANOPP-PAS usage, data entry preprocessors, and ANOPP-PAS functional modules and procedures. Appendices to the manual include a glossary of ANOPP terms and information on error diagnostics and recovery techniques. Nolan, Sandra K. Unspecified Center NASA-CR-181689, NAS 1.26:181689 NAS1-18000; RTOP 505-63-51-07...