Applied Research and Development for Falling-Sphere Air Density Measuring Systems.
This contract involves the development, fabrication, testing, and calibration of four complete high altitude densitometer payloads, each comprised of a nose cone, an ejection system, and a ten-inch falling sphere. The sphere, in turn, is instrumented with a sensitive accelerometer, a TM system, a nu...
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ftdtic:ADA155227 2023-05-15T17:04:17+02:00 Applied Research and Development for Falling-Sphere Air Density Measuring Systems. Fryklund,D H ACCUMETRICS CORP ROCKPORT MS 1984-08 text/html http://www.dtic.mil/docs/citations/ADA155227 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA155227 en eng http://www.dtic.mil/docs/citations/ADA155227 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Atmospheric Physics Test Facilities Equipment and Methods *ATMOSPHERIC DENSITY *DENSITOMETERS VELOCITY EUROPE DENSITY MEASUREMENT CONTROL SYSTEMS PAYLOAD DETECTORS ACCELEROMETERS AIR ACCELERATION SPHERES SENSITIVITY PROFILES HIGH ALTITUDE AERODYNAMIC DRAG POWER SUPPLIES TRANSDUCERS EJECTION CALIBRATION EQUATIONS NORWAY TRAJECTORIES DYNAMIC RANGE SWEDEN ASPECT ANGLE BACKUP SYSTEMS SUN NOSE CONES FALLING BODIES PIEZOELECTRIC GAGES Falling sphere densitometers Nutation sensors PE62101F WUAFGL669004AP Text 1984 ftdtic 2016-02-21T00:27:55Z This contract involves the development, fabrication, testing, and calibration of four complete high altitude densitometer payloads, each comprised of a nose cone, an ejection system, and a ten-inch falling sphere. The sphere, in turn, is instrumented with a sensitive accelerometer, a TM system, a nutation sensor, and various ancillary power supply and control systems. Air density is determined by measuring the negative air-drag acceleration as experienced by the sphere as it falls through the atmosphere. By evaluating the air drag equation for a spherical shape having the same area and mass, with the measured fall velocity and negative acceleration the air density profile for the trajectory can be calculated. Air density measurement over the desired range of 50 to 150 KM requires the use of a sensitive accelerometer having a dynamic range of 0.01 to 0.0000001 g's. Four complete falling-sphere densitometer systems were designed, fabricated and launched at four locations: Wallops Island, VA; Kiruna, Sweden; Poker Flat, Alas.; and Andoya, Norway. The former back-up densitometer was upgraded and was flown during the Norway program. Three unique support units were designed and fabricated for use with the European payloads. A solar aspect system was designed, fabricated and flown on the Alaskan payload. Additionally, several studies were performed to generally improve the ground and flight equipment. Keywords: Piezoelectric; Transducer; Atmospheric density. Text Kiruna Defense Technical Information Center: DTIC Technical Reports database Kiruna Norway |
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Defense Technical Information Center: DTIC Technical Reports database |
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English |
topic |
Atmospheric Physics Test Facilities Equipment and Methods *ATMOSPHERIC DENSITY *DENSITOMETERS VELOCITY EUROPE DENSITY MEASUREMENT CONTROL SYSTEMS PAYLOAD DETECTORS ACCELEROMETERS AIR ACCELERATION SPHERES SENSITIVITY PROFILES HIGH ALTITUDE AERODYNAMIC DRAG POWER SUPPLIES TRANSDUCERS EJECTION CALIBRATION EQUATIONS NORWAY TRAJECTORIES DYNAMIC RANGE SWEDEN ASPECT ANGLE BACKUP SYSTEMS SUN NOSE CONES FALLING BODIES PIEZOELECTRIC GAGES Falling sphere densitometers Nutation sensors PE62101F WUAFGL669004AP |
spellingShingle |
Atmospheric Physics Test Facilities Equipment and Methods *ATMOSPHERIC DENSITY *DENSITOMETERS VELOCITY EUROPE DENSITY MEASUREMENT CONTROL SYSTEMS PAYLOAD DETECTORS ACCELEROMETERS AIR ACCELERATION SPHERES SENSITIVITY PROFILES HIGH ALTITUDE AERODYNAMIC DRAG POWER SUPPLIES TRANSDUCERS EJECTION CALIBRATION EQUATIONS NORWAY TRAJECTORIES DYNAMIC RANGE SWEDEN ASPECT ANGLE BACKUP SYSTEMS SUN NOSE CONES FALLING BODIES PIEZOELECTRIC GAGES Falling sphere densitometers Nutation sensors PE62101F WUAFGL669004AP Fryklund,D H Applied Research and Development for Falling-Sphere Air Density Measuring Systems. |
topic_facet |
Atmospheric Physics Test Facilities Equipment and Methods *ATMOSPHERIC DENSITY *DENSITOMETERS VELOCITY EUROPE DENSITY MEASUREMENT CONTROL SYSTEMS PAYLOAD DETECTORS ACCELEROMETERS AIR ACCELERATION SPHERES SENSITIVITY PROFILES HIGH ALTITUDE AERODYNAMIC DRAG POWER SUPPLIES TRANSDUCERS EJECTION CALIBRATION EQUATIONS NORWAY TRAJECTORIES DYNAMIC RANGE SWEDEN ASPECT ANGLE BACKUP SYSTEMS SUN NOSE CONES FALLING BODIES PIEZOELECTRIC GAGES Falling sphere densitometers Nutation sensors PE62101F WUAFGL669004AP |
description |
This contract involves the development, fabrication, testing, and calibration of four complete high altitude densitometer payloads, each comprised of a nose cone, an ejection system, and a ten-inch falling sphere. The sphere, in turn, is instrumented with a sensitive accelerometer, a TM system, a nutation sensor, and various ancillary power supply and control systems. Air density is determined by measuring the negative air-drag acceleration as experienced by the sphere as it falls through the atmosphere. By evaluating the air drag equation for a spherical shape having the same area and mass, with the measured fall velocity and negative acceleration the air density profile for the trajectory can be calculated. Air density measurement over the desired range of 50 to 150 KM requires the use of a sensitive accelerometer having a dynamic range of 0.01 to 0.0000001 g's. Four complete falling-sphere densitometer systems were designed, fabricated and launched at four locations: Wallops Island, VA; Kiruna, Sweden; Poker Flat, Alas.; and Andoya, Norway. The former back-up densitometer was upgraded and was flown during the Norway program. Three unique support units were designed and fabricated for use with the European payloads. A solar aspect system was designed, fabricated and flown on the Alaskan payload. Additionally, several studies were performed to generally improve the ground and flight equipment. Keywords: Piezoelectric; Transducer; Atmospheric density. |
author2 |
ACCUMETRICS CORP ROCKPORT MS |
format |
Text |
author |
Fryklund,D H |
author_facet |
Fryklund,D H |
author_sort |
Fryklund,D H |
title |
Applied Research and Development for Falling-Sphere Air Density Measuring Systems. |
title_short |
Applied Research and Development for Falling-Sphere Air Density Measuring Systems. |
title_full |
Applied Research and Development for Falling-Sphere Air Density Measuring Systems. |
title_fullStr |
Applied Research and Development for Falling-Sphere Air Density Measuring Systems. |
title_full_unstemmed |
Applied Research and Development for Falling-Sphere Air Density Measuring Systems. |
title_sort |
applied research and development for falling-sphere air density measuring systems. |
publishDate |
1984 |
url |
http://www.dtic.mil/docs/citations/ADA155227 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA155227 |
geographic |
Kiruna Norway |
geographic_facet |
Kiruna Norway |
genre |
Kiruna |
genre_facet |
Kiruna |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA155227 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766058357962047488 |