NASA/Langley Research Center, Mail Stop 144, Industry Assistance Office, Hampton, VA 23681-0001

A -- RESEARCH IN AIRCRAFT ACOUSTICS AND NOISE CONTROL SOL SS290 DUE 052698 POC Linda P. Fitzgerald, Procurement Analyst, Phone (757)-864-2461, Fax (757) 864-7898, Email L.P.FITZGERALD@ larc.nasa.gov WEB: Click here for the latest information about this notice, http://nais.nasa.gov/EPS/LaRC/date.html#SS290. E-MAIL: Linda P. Fitzgerald, L.P.FITZGERALD@larc.nasa.gov. NASA/LaRC is hereby soliciting information for potential sources for Research in Aircraft Acoustics and Noise Control. NASA has begun a program to improve the understanding, prediction and control of aircraft noise to meet the Environmental Compatibility goals of NASA's Aeronautics and Space Transportation Enterprise. These goals, which are necessary to meet increasingly stringent local, national, and international noise regulations, are to reduce the perceived level of aircraft noise in airport communities by 10 dB by 2007 and by 20 dB by 2017 without affecting safety or affordability. The objective of this contracting effort is to provide part of the required research in aircraft acoustics and noise control which will permit the attainment of the aggressive NASA goals. Because of the broad range of research and diverse disciplines and facilities required, the proposed research has been divided into the following Work Package Areas: A. Engine Noise Prediction, Control and Measurement: Research areas of interest include theoretical and experimental studies of engine fan tone and broadband noise, and jet noise; development of advanced noise reduction concepts including advanced nacelle liners and active control; development of fan, and jet noise prediction methods including effects of active control; and development of advanced aeroacoustics test methods and hardware. B. Airframe Noise Prediction, Control and Measurement: Research areas of interest include theoretical and experimental studies of the noise generated by airflow over high-lift devices and landing gears and by jet/flap interaction, including the development of Reynolds number and velocity scaling laws; noise reduction concepts and diagnostics utilizing both passive and active control methods based upon the fluid mechanics of the source; and improvements in microphone array technology emphasizing its extension for obtaining both directivity and quantitative spectra in reverberant chambers C. Structural Acoustics and Aircraft Interior Noise Prediction and Control: Research areas of interest include measurement and prediction of aircraft interior noise; development of diagnostic techniques to determine the paths by which noise reaches the passengers and crew of different classes of aircraft; development and implementation of active and passive noise and vibration control techniques for jet and propeller airplane and rotorcraft cabins; theoretical and experimental studies of the response and fatigue of aerospace structures to acoustic and fluctuating pressure loads; and development of advanced structural acoustics test methods and hardware. D. Rotorcraft Noise Prediction, Control and Measurement: Research areas of interest include theoretical and experimental studies to understand aerodynamics and acoustic behavior of rotorcraft noise sources; development and demonstration of innovative methods of reduction of rotorcraft source noise, such as blade/vortex interaction noise, high speed impulsive noise, and noise due to fountain flow effect of tiltrotor aircraft; development of methodology for noise prediction and application studies and assessments; integration of acoustic models with other disciplines, such as aerodynamic performance, for tradeoff studies; and design, planning and execution of helicopter and tiltrotor flight tests for acquiring noise data bases for analytical validations. E. Community Noise Prediction and Impact: Research areas of interest include analytical and experimental studies of long distance sound propagation in the atmosphere; development of models or algorithms for predicting aircraft noise exposure and for minimizing aircraft noise impact through flight track or profile optimization; assessment of aircraft noise exposure and the impact of that exposure on community residents and structures; surveys of reactions of community residents to aircraft flyover noise and sonic booms; development of models for predicting community response to aircraft noise; and development of models for predicting the overall impact of aircraft noise onareas close to and remote from airports, which consider population distributions, land use, terrain, ambient noise levels, wildlife, and historical or archeological sites. The activity is expected to span a five year period of performance commencing approximately November 1, 1998. Firms having the required specialized capabilities to conduct research in one or more of the required Work Package Areas should submit a capability statement of 10 pages or less indicating the ability to perform the efforts as described above. The Standard Industrial Classification (SIC) code is 8731 with a size standard of 1,500 employees. No solicitation exists; therefore, do not request a copy of the solicitation. If a solicitation is released, it will be synopsized in the CBD and on the NASA Acquisition Internet Service. It is the potential offerors responsibility to monitor these cites for the release of any solicitation or synopsis. Technical questions should be directed to Clemans A. Powell at 757-864-2980 or Email: c.a.powell@ larc.nasa.gov. Procurement related questions should be directed to Betty B. Mayhew at 757-864-2530 or Email: b.b.mayhew@larc.nasa.gov. Interested offerors/vendors having the required specialized capabilities to meet the above requirement should submit a capability statement of 10 pages or less indicating the ability to perform all aspects of the effort described herein. Responses must include the following: name and address of firm, size of business; average annual revenue for past 3 years and number of employees; ownership; whether they are large, small, small disadvantaged 8 (a), and or woman owned; number of years in business; affiliate information: parent company, joint venture partners, potential teaming partners, prime contractor (if potential sub) or subcontractors (if potential prime); list of customers covering the past five years (highlight relevant work performed, contract numbers, contract type, dollar value of each procurement; and point of contact -- address and phone number). Please advise if the requirement is considered to be a commercial or commercial-type product. A commercial item is defined in Internet "Note A". [INTERNET ONLY (commercial product definition)] This synopsis is for information and planning purposes and is not to be construed as a commitment by the Government nor will the Government pay for information solicited. Respondents will not be notified of the results of the evaluation. Respondents deemed fully qualified will be considered in any resultant solicitation for the requirement. The Government reserves the right to consider a small business or 8(a) set-aside based on responses hereto. All responses shall be submitted to NASA Langley Research Center, 9 Langley Boulevard, Mail Stop 144, Industry Assistance Office, Hampton, VA 23681-0001, no later than May 26, 1998. In responding reference SS289. Any referenced notes can be viewed at the following URL: http://genesis.gsfc.nasa.gov/nnotes.htm. (0131)

Loren Data Corp. http://www.ld.com (SYN# 0014 19980514\A-0014.SOL)