Analysis of the passive accelerometer system (PAS) measurements during USML-1

Matisak, B; Rogers, Melissa J. B.; Alexander, J. Iwan D.

doi:10.2514/6.1994-434

Cited by 10 publications

(6 citation statements)

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“…The analysis described in this section is based on actual g-jitter data collected during the SL-J mission (SAMS-258), that flew on September [13][14][15][16][17][18][19][20]1993. We have focused on the head A SAMS detector, and studied the series during the time window MET 0017 to MET 0023, roughly a period of six hours.…”

Section: Time Series Analysis Of G-jitter During the Sl-j Missionmentioning

confidence: 99%

“…A similar principle has been used to design a passive accelerometer system [14] to obtain the steady component of the residual acceleration field from the linear drift of a suspended particle. Not surprisingly, it has proved difficult in actual microgravity conditions to maintain a well defined alignment of the container with respect to the residual acceleration field.…”

Section: Introductionmentioning

confidence: 99%

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Cavity flow induced by a fluctuating acceleration field

1995

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Flow induced by a random acceleration field (g-jitter) is considered in two related situations that are of interest for microgravity fluid experiments: the random motion of an isolated buoyant particle and coarsening of a solid-liquid mixture. We start by analyzing in detail actual accelerometer data gathered during a recent microgravity mission, and obtain the values of the parameters defining a previously introduced stochastic model of this acceleration field.We then study the motion of a solid particle suspended in an incompressible fluid that is subjected to such random accelerations. The displacement of the particle is shown to have a diffusive component if the correlation time of the stochastic acceleration is finite or zero, and mean squared velocities and effective diffusion coefficients are obtained explicitly. Finally, the effect of g-jitter on coarsening of a solid-liquid mixture is considered. Corrections due to the induced fluid motion are calculated, and estimates are given for coarsening of Sn-rich particles in a Sn-Pb eutectic fluid, experiment to be 1 conducted in microgravity in the near future.

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Section: Time Series Analysis Of G-jitter During the Sl-j Missionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cavity flow induced by a fluctuating acceleration field

1995

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“…Only the tangential acceleration component drives the bubble motion, so that the g in equations (1) and 2is reduced to the tangential component,…”

Section: Constrained Bubble Motionmentioning

confidence: 99%

Quasi-steady acceleration direction indicator in three dimensions

DeLombard

Nelson

Jules

2000

38th Aerospace Sciences Meeting and Exhibit

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Since its founding, NASA has been dedicated to the advancement of aeronautics and space science. The NASA Scientific and Technical Information (STI) Program Office plays a key part in helping NASA maintain this important role. The NASA STI Program Office is operated by Langley Research Center, the Lead Center for NASA's scientific and technical information. The NASA STI Program Office provides access to the NASA STI Database, the largest collection of aeronautical and space science STI in the world. The Program Office is also NASA's institutional mechanism for disseminating the results of its research and development activities. These results are published by NASA in the NASA STI Report Series, which includes the following report types:

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“…This is a positive acceleration in the vehicle reference frame. A particle will gravitate away from the CM if it is above or below the CM along the z ISS -axis of LVLH [41]. Therefore, the LVLH acceleration acting on a particle within an orbiting vehicle can be written as: Microgravity Summary Report [42].…”

Section: Appendix a List Of Cfe-2 Experiments Performed To Datementioning

confidence: 99%

Capillary Phenomena: Investigations in Compressed Bubble Migration, Geometric Wetting, and Blade-Bound Droplet Stability

Blackmore¹

2000

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Capillary flows continue to be important in numerous spacecraft systems where the effective magnitude of the gravity vector is approximately one millionth that of normal Earth gravity. Due to the free fall state of orbiting spacecraft, the effects of capillarity on the fluid systems onboard can dominate the fluid behavior over large length scales. In this research three investigations are pursued where the unique interplay between surface tension forces, wetting characteristics, and system geometry control the fluid behavior, whether in large systems aboard spacecraft, or micro-scale systems on Earth.

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Analysis of the passive accelerometer system (PAS) measurements during USML-1

Cited by 10 publications

References 0 publications

Cavity flow induced by a fluctuating acceleration field

Cavity flow induced by a fluctuating acceleration field

Quasi-steady acceleration direction indicator in three dimensions

Capillary Phenomena: Investigations in Compressed Bubble Migration, Geometric Wetting, and Blade-Bound Droplet Stability

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