Comparison tools for assessing the microgravity environment of orbital missions, carriers and conditions

DeLombard, Richard; Hrovat, Kenneth; McPerson, K.M.

doi:10.1109/imtc.1999.776999

Cited by 4 publications

(2 citation statements)

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“…Our study is motivated by the significant levels of residual accelerations (g-jitter) that have been detected during space missions in which microgravity experiments have been conducted (Walter (1987), Nelson (1991), DeLombard et al (1997)). Direct measurement of these residual accelerations has shown that they have a wide frequency spectrum, ranging approximately from 10 −4 Hz to 10 2 Hz.…”

Section: Introductionmentioning

confidence: 99%

“…Our study is primarily motivated by the significant levels of random residual accelerations (g-jitter) that have been detected during Space missions in which microgravity experiments have been conducted (Walter 1987;Nelson 1991;DeLombard et al 1997). A better understanding of the response of a fluid to such disturbances would enable improved experiment design to minimize or compensate for their influence.…”

Section: Introductionmentioning

confidence: 99%

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Flow induced by a randomly vibrating boundary

Volfson

Viñals

2001

J. Fluid Mech.

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We study the flow induced by random vibration of a solid boundary in an otherwise quiescent fluid. The analysis is motivated by experiments conducted under the low level and random effective acceleration field that is typical of a microgravity environment. When the boundary is planar and is being vibrated along its own plane, the variance of the velocity field decays as a power law of distance away from the boundary. If a low frequency cut-off is introduced in the power spectrum of the boundary velocity, the variance decays exponentially for distances larger than a Stokes layer thickness based on the cut-off frequency. Vibration of a gently curved boundary results in steady streaming in the ensemble average of the tangential velocity. Its amplitude diverges logarithmically with distance away from the boundary, but asymptotes to a constant value instead if a low frequency cut-off is considered. This steady component of the velocity is shown to depend logarithmically on the cut-off frequency. Finally, we consider the case of a periodically modulated solid boundary that is being randomly vibrated. We find steady streaming in the ensemble average of the first order velocity, with flow extending up to a characteristic distance of the order of the boundary wavelength. The structure of the flow in the vicinity of the boundary depends strongly on the correlation time of the boundary velocity.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%