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  • Other Sources  (12)
  • Acoustics  (7)
  • SPACECRAFT PROPULSION AND POWER  (5)
  • 1
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    The NASA space power technology program (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: NASA has a broad technology program in the field of space power. This paper describes that program, including the roles and responsibilities of the various NASA field centers and major contractors. In the power source area, the paper discusses the SP-100 Space Nuclear Power Project, which has been under way for about seven years and is making substantial progress toward development of components for a 100-kilowatt power system that can be scaled to other sizes. This system is a candidate power source for nuclear electric propulsion, as well as for a power plant for a lunar base. In the energy storage area, the paper describes NASA's battery- and fuel-cell development programs. NASA is actively working on NiCd, NiH2, and lithium batteries. A status update is also given on a U.S. Air Force-sponsored program to develop a large (150 ampere-hour) lithium-thionyl chloride battery for the Centaur upper-stage launch vehicle. Finally, the area of power management and distribution (PMAD) is addressed, including power system components such as solid-state switches and power integrated circuits. Automated load management and other computer-controlled functions offer considerable payoffs. The state of the art in space power is described, along with NASA's medium- and long-term goals in the area.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: ; : Spaceflight mechan
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Helicopter Acoustic Flight Test with Altitude Variation and Maneuvers (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A cooperative flight test campaign between NASA and the U.S. Army was performed from September 2014 to February 2015. The purposes of the testing were to: investigate the effects of altitude variation on noise generation, investigate the effects of gross weight variation on noise generation, establish the statistical variability in acoustic flight testing of helicopters, and characterize the effects of transient maneuvers on radiated noise for a medium-lift utility helicopter. This test was performed at three test sites (0, 4000, and 7000 feet above mean sea level) with two aircraft (AS350 SD1 and EH-60L) tested at each site. This report provides an overview of the test, documents the data acquired and describes the formats of the stored data.
    Keywords: Acoustics
    Type: NASA/TM-2016-219354 , L-20729 , NF1676L-24899
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    NASA TECHNICAL REPORTS
  • 3
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    Characterization of Low Frequency Auditory Filters (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: The purpose of this study is to characterize auditory filters at low frequencies, defined as below about 100 Hz. Three experiments were designed and executed. They were conducted in the Exterior Effects Room at the NASA Langley Research Center, a psychoacoustic facility designed for presentation of aircraft flyover sounds to groups of test subjects. The first experiment measured 36 subjects hearing threshold for pure tones (at 25, 31.5, 40, 50, 63 and 80 Hz) in quiet conditions. The subjects, male and female, had a wide age range. This experiment allowed the performance of the test facility to be assessed and also provided screened test subjects for participation in subsequent experiments. The second and third experiments used 20 and 10 test subjects, respectively, and measured psychophysical tuning curves (PTCs) that describe auditory filters with center frequencies of approximately 63 and 50 Hz. The latter is assumed to be the lowest (bottom) auditory filter; thus, sounds at frequencies below about 50 Hz are perceived via the lower skirt of this lowest filter. All experiments used an adaptive, three-alternative forced-choice test procedure using either variable level tones or variable level, narrowband noise maskers. Measured PTCs were found to be very similar to other recently published data, both in terms of mean values and intersubject variation, despite different experimental protocols, different test facilities, and a wide range in subjects age.
    Keywords: Acoustics
    Type: NASA/TM?2019-220120 , L-20983 , NF1676L-31935
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    NASA TECHNICAL REPORTS
  • 4
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    Status of NASA's Earth-to-Orbit Propulsion Technology program (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-14
    Description: Earth-to-Orbit Propulsion Technology program is considered. The program's three major technical areas include combustion devices, turbomachinery, and controls and monitoring. Directed toward reducing acquisition and operations risk and cost the ETO program is conducted in two serially-performed categories: technology acquisition and technology validation. The former is constituted of studies, tool building, and bench-scale experimentation. The latter involves next-step verification of the acquisition results and findings, usually leading to a test-bed validated technology 'product'.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: IAF PAPER 91-258
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    NASA TECHNICAL REPORTS
  • 5
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    Advanced Earth-to-orbit propulsion technology program overview: Impact of civil space technology initiative (1988)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The NASA Earth-to-Orbit (ETO) Propulsion Technology Program is dedicated to advancing rocket engine technologies for the development of fully reusable engine systems that will enable space transportation systems to achieve low cost, routine access to space. The program addresses technology advancements in the areas of engine life extension/prediction, performance enhancements, reduced ground operations costs, and in-flight fault tolerant engine operations. The primary objective is to acquire increased knowledge and understanding of rocket engine chemical and physical processes in order to evolve more realistic analytical simulations of engine internal environments, to derive more accurate predictions of steady and unsteady loads, and using improved structural analyses, to more accurately predict component life and performance, and finally to identify and verify more durable advanced design concepts. In addition, efforts were focused on engine diagnostic needs and advances that would allow integrated health monitoring systems to be developed for enhanced maintainability, automated servicing, inspection, and checkout, and ultimately, in-flight fault tolerant engine operations.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA, Marshall Space Flight Center, Advanced Earth-to-Orbit Propulsion Technology 1988, Volume 1; p 5-19
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    NASA TECHNICAL REPORTS
  • 6
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    The NASA-OAST earth-to-orbit propulsion technology program - The action plan (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The paper discusses the primary objective of the NASA-OAST earth-to-orbit (ETO) propulsion technology program, namely, to completely overhaul the nation's liquid rocket design and analysis capabilities which were found to be severely limited when used for the design and development of the Space Shuttle Main Engine (SSME). Meeting this objective is to provide a much sounder, very comprehensive technology base that will enable the cost-effective low-risk development, acquisition, and operation of high-performance, expendable, or reusable ETO propulsion systems. This in turn will enable the future development of space transportation system launch vehicles with greatly reduced life-cycle costs. Work is carried out in three major areas: combustion devices, turbomachinery, and controls and health management.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: AIAA PAPER 92-1478
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    NASA TECHNICAL REPORTS
  • 7
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    Measurement and Characterization of Helicopter Noise at Different Altitudes (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper presents an overview of a flight test campaign performed at different test sites whose altitudes ranged from 0 to 7000 feet above mean sea level (AMSL) between September 2014 and February 2015. The purposes of this campaign were to: investigate the effects of altitude variation on noise generation, investigate the effects of gross weight variation on noise generation, establish the statistical variability in acoustic flight testing of helicopters, and characterize the effects of transient maneuvers on radiated noise for a medium-lift utility helicopter. In addition to describing the test campaign, results of the acoustic effects of altitude variation for the AS350 SD1 and EH-60L aircraft are presented. Large changes in acoustic amplitudes were observed in response to changes in ambient conditions when the helicopter was flown at constant indicated airspeed and gross weight at the three test sites. However, acoustic amplitudes were found to scale with ambient pressure when flight conditions were defined in terms of the non-dimensional parameters, such as the weight coefficient and effective hover tip Mach number.
    Keywords: Acoustics
    Type: NF1676L-22567 , American Helicopter Society (AHS) Annual Forum; May 17, 2016 - May 19, 2016; West Palm Beach, FL; United States
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    NASA TECHNICAL REPORTS
  • 8
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    Overview of Rotorcraft Acoustic Flight Testing (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Acoustics
    Type: NF1676L-21246 , 2015 Acoustics Technical Working Group Meeting; Apr 21, 2015 - Apr 22, 2015; Hampton, VA; United States
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    NASA TECHNICAL REPORTS
  • 9
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    Establishing the Response of Low Frequency Auditory Filters (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-19
    Description: The response of auditory filters is central to frequency selectivity of sound by the human auditory system. This is true especially for realistic complex sounds that are often encountered in many applications such as modeling the audibility of sound, voice recognition, noise cancelation, and the development of advanced hearing aid devices. The purpose of this study was to establish the response of low frequency (below 100Hz) auditory filters. Two experiments were designed and executed; the first was to measure subject's hearing threshold for pure tones (at 25, 31.5, 40, 50, 63 and 80 Hz), and the second was to measure the Psychophysical Tuning Curves (PTCs) at two signal frequencies (Fs= 40 and 63Hz). Experiment 1 involved 36 subjects while experiment 2 used 20 subjects selected from experiment 1. Both experiments were based on a 3-down 1-up 3AFC adaptive staircase test procedure using either a variable level narrow-band noise masker or a tone. A summary of the results includes masked threshold data in form of PTCs, the response of auditory filters, their distribution, and comparison with similar recently published data.
    Keywords: Acoustics
    Type: NF1676L-27590 , Meeting of the Acoustical Society of America; Dec 04, 2017 - Dec 08, 2017; New Orleans, LA; United States
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    NASA TECHNICAL REPORTS
  • 10
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    NASA's CSTI Earth-to-Orbit Propulsion Program - On-target technology transfer to advanced space flight programs (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: NASA's Civil Space Technology Initiative encompasses among its major elements the Earth-to-Orbit Propulsion Program (ETOPP) for future launch vehicles, which is budgeted to the extent of $20-30 million/year for the development of essential technologies. ETOPP technologies include, in addition to advanced materials and processes and design/analysis computational tools, the advanced systems-synthesis technologies required for definition of highly reliable LH2 and hydrocarbon fueled rocket engines to be operated at significantly reduced levels of risk and cost relative to the SSME. Attention is given to the technology-transfer services of ETOPP.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: SAE PAPER 901044
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