Space Acceleration Measurement System-II Crew ...

NASA Glenn Research CenterMicrogravity Science Division

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Space Acceleration Measurement System-IICrew Familiarization Briefing - Science

Kevin McPhersonPrincipal Investigator Microgravity Services Project Manager

NASA Glenn Research CenterPhone: (216) 433-6182

Fax: (216) 433-8660E-mail: [email protected]


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Acceleration Measurement Program

• Program provides acceleration measurement support to microgravity principal investigators° develop and operate accelerometer systems for microgravity

research platforms° analyze and interpret accelerometer data to characterize the

microgravity environment of the research platforms for principalinvestigators

° support microgravity environment requirement activities• Acceleration measurement WWW links

° http://microgravity.grc.nasa.gov° http://microgravity.grc.nasa.gov/MSD/MSD_htmls/accel_meas.html° http://microgravity.grc.nasa.gov/MSD/MSD_htmls/PIMS.html° http://www.grc.nasa.gov/WWW/MMAP/PIMS/HTMLS/Micro-descpt.html° http://www.lerc.nasa.gov/WWW/MMAP/PIMS/HTMLS/adapt.html° http://tsccrusader.grc.nasa.gov/pims


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Principal Investigator Microgravity Services

• Purpose° To analyze and interpret accelerometer data to characterize the

microgravity environment of Earth-orbiting laboratories for the microgravity principal investigators

° Maintain archive of acceleration data from various microgravity platforms including ISS, MIR, Space Shuttle, KC-135, and sound rockets

° Approach• Throughout the PI’s preparation for flight, the PIMS team will offer tutorial

sessions and one-on-one interaction to help the PI team understand different aspects of measuring and interpreting the microgravity environment

• Following the acquisition of accelerometer data, the PIMS team will provide expert consultation on interpretation of the microgravity environment and perform detailed analyses for general characterization and on a per-request basis


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Example Figures

• Figure 1 – Nominal Environment Plot (STS-78)• Figure 2 - Principal Component Spectral Analysis (STS-78)• Figure 3 – Flight 7A Docking (STS-104)• Figure 4 – Progress Docking Acceleration vs. Time (ISS)• Figure 5 – EXPPCS Mixing Operations Spectrogram (ISS)• Figure 6 - EXPPCS Mixing Operations Minimum/Maximum

Acceleration vs. Time (ISS)• Figure 7 – Quasi-Steady Three Dimensional Histogram During Crew

Sleep (ISS)• Figure 8 - Quasi-Steady Three Dimensional Histogram During Crew

Wake Periods (ISS)• Figure 9 – Cabin Depressurization (STS-87)• Figure 10 - OARE vs. SOFBALL Radiometry Data (STS-94)

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003/00:00 003/01:00 003/02:00 003/03:00 003/04:00 003/05:00 003/06:000

5

10

15

20

25

Mission Elapsed Time (Day/Hour:Minute)

Fre

quen

cy (

Hz)

Figure 24: LMS, Head C (fc=25 Hz)

B−

27

SU

MM

AR

Y R

EP

OR

T O

F M

ISS

ION

AC

CE

LER

AT

ION

ME

AS

UR

EM

EN

TS

FO

R S

TS

−78

RS

S M

agni

tude

[log 1

0(g2 /

Hz)

]

Figure 1. Nominal Environment Plot (STS-78)

Per

cent

age

of T

ime

0

0.5

1

1.5

2

2.5

3

3.5

4

0 5 10 15 20 2510

−12

10−11

10−10

10−9

10−8

10−7

10−6

10−5

10−4

10−3

10−2

Frequency (Hz)

PCSA Density Analysis: LMS, RSS

PS

D V

alue

(g2 /

Hz)

Figure 2. Principal Component Spectral Analysis (STS-78)

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Σ P

SD

Mag

nitu

de [l

og 10(g

2 /Hz)

]

Fre

quen

cy (

Hz)

Start GMT 14−Jul−2001,02:38:40.000

from: t:\pub\pad\, $Name: pop1_06−13−2001 $, 19−Jul−2001,13:04:30.902

STS−104 Docking Span = 60.01 minutesHanning, k = 866

SumIncrement: 2, Flight: 6A

Temp. Res. = 4.096 sec, No = 4096∆f = 0.122 Hz, Nfft = 81921000.0 sa/sec (100.00 Hz)mams, hirap at LAB1O2, ER1, Lockers 3,4:[138.68 −16.18 142.35]

0 10 20 30 40 50 600

10

20

30

40

50

60

70

80

90

100

Figure 3 — Flight 7A Docking (STS-104)STS-104 Docking

STS-104 Hardware & Onset of 17 Hz Antenna Signature

Time (minutes)

0 1 2 3 4 5 6 7 8−15

−10

−5

0

5

10

15

Z−

Axi

s A

ccel

erat

ion

(µg)

RM

S =

2.6

639

µgO

rigi

nal M

ean

= 1

.173

4 µg

from: t:\pub\, $Name: $, 21−Jun−2001,12:12:43.790

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−10

−5

0

5

10

15

Y−

Axi

s A

ccel

erat

ion

(µg)

RM

S =

1.9

131

µgO

rigi

nal M

ean

= −

0.83

06 µ

g

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−5

0

5

10

15

X−

Axi

s A

ccel

erat

ion

(µg)

RM

S =

2.3

235

µgO

rigi

nal M

ean

= −

0.86

44 µ

g

Start GMT 22−May−2001,20:00:05.398

Progress Docking

oss[90.0 0.0 0.0]

Increment: 2, Flight: 6A

0.0625 sa/sec

mams, ossbtmf at LAB1O2, ER1, Lockers 3,4:[135.28 −10.68 132.12]

Docking Attitude

Figure 4 — Progress Docking Acceleration vs. Time (ISS)Time (hours)

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Σ P

SD

Mag

nitu

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og 10(g

2 /Hz)

]

Fre

quen

cy (

Hz)

GMT 04−Jun−2001,22:10:00.001

from: /r/sdds/pims/pub/pad/, $Name: popbeta_06−07−2001 $, 11−Jun−2001,07:59:24.240

EXPPCS Sample Mix Operations Span = 1.33 hoursHanning, k = 1160

SumIncrement: 2, Flight: 6A

Temp. Res. = 4.096 sec, No = 2048∆f = 0.122 Hz, Nfft = 4096500.0 sa/sec (200.00 Hz)sams2, 121f06 at LAB1O1, ER2, PCS Test Section:[179.90 −6.44 145.55]

22:10 22:25 22:40 22:55 23:10 23:250

10

20

30

40

50

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80

90

100

Figure 5 — EXPPCS Mixing Operations Spectrogram (ISS)hh:mm

0 30 60 90 120 150 180 210 240 270 300−200

−150

−100

−50

0

50

100

150

200

Z−

Axi

s A

ccel

erat

ion

(mg)

from: t:\pub\pad\, $Name: popbeta_06−07−2001 $, 12−Jun−2001,12:19:31.609

−200

−150

−100

−50

0

50

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150

200

Y−

Axi

s A

ccel

erat

ion

(mg)

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150

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X−

Axi

s A

ccel

erat

ion

(mg)

Start GMT 04−Jun−2001,22:20:10.873

30−Second Duty Cycle of EXPPCS Sample Mix OperationsSize: 0.25, Step: 0.25 sec.

Interval Minmax

121f06[180.0 90.0 0.0]


500.0 sa/sec (200.00 Hz)

sams2, 121f06 at LAB1O1, ER2, PCS Test Section:[179.90 −6.44 145.55]

Figure 6 - EXPPCS Mixing Operations Minimum/Maximum Acceleration vs. Time (ISS) Time (seconds)

Compilation of XPOP Attitude Profiles During Crew Sleep Periods oss[90.0 0.0 0.0]Increment: 2, Flight: 6A

Time Span = 31.2756 hours0.0625 sa/secmams, ossbtmf at LAB1O2, ER1, Lockers 3,4:[135.28 −10.68 132.12]


Centroid: Xct = +2.027 (µg) Yct = −0.293 (µg) Zct = +0.524 (µg)

Perc

enta

ge o

f T

ime

0

0.1

0.2

0.3

0.4

0.5

X−Axis Accel. (µg)

Z−

Axi

s A

ccel

. (µg

)

−3 −2 −1 0 1 2 3−3

−2

−1

0

1

2

3

Y−Axis Accel. (µg)

Z−

Axi

s A

ccel

. (µg

)

−3 −2 −1 0 1 2 3−3

−2

−1

0

1

2

3


Y−

Axi

s A

ccel

. (µg

)

−3 −2 −1 0 1 2 3−3

−2

−1

0

1

2

3

Figure 7 Quasi-Steady Three Dimensional Histogram During Crew Sleep (ISS)

Compilation of XPOP Attitude Profiles During Crew Active Periodsoss[90.0 0.0 0.0]


Time Span = 32.4444 hours0.0625 sa/secmams, ossbtmf at LAB1O2, ER1, Lockers 3,4:[135.28 −10.68 132.12]


Centroid: Xct = +2.172 (µg) Yct = −0.292 (µg) Zct = +0.351 (µg)

Perc

enta

ge o

f T

ime

0

0.05

0.1

0.15

0.2

0.25


Z−

Axi

s A

ccel

. (µg

)

−3 −2 −1 0 1 2 3−3

−2

−1

0

1

2

3

Y−Axis Accel. (µg)

Z−

Axi

s A

ccel

. (µg

)

−3 −2 −1 0 1 2 3−3

−2

−1

0

1

2

3


Y−

Axi

s A

ccel

. (µg

)

−3 −2 −1 0 1 2 3−3

−2

−1

0

1

2

3

Figure 8 - Quasi-Steady Three Dimensional Histogram During Crew Wake Periods (ISS)

Figure 9. Cabin De-pressurization (STS-87)

0 50 100 150 200−10

−5

0

5

10

X−

Axi

s (m

icro

−g)

Mea

n =

0.1

117

µg

OARE, Trimmed Mean FilteredOARE Location

USMP−4Body Coordinates

Frame of Reference: Orbiter

MATLAB: 25−Jun−1998, 03:18 pm

MET Start at 004/08:00:23.040

Cabin De−Pressurization for EVA #1

0 50 100 150 200−10

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Y−

Axi

s (m

icro

−g)

Mea

n =

−0.

9597

µg

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0

5

10

Time (min)

Z−

Axi

s (m

icro

−g)

Mea

n =

1.0

342

µg

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CabinDe-Pressurization

Radiometer 1Radiometer 2Radiometer 3Radiometer 4

0 1 2 3 4 5 6 7 8 9−20

0

20

40

60

80

100

120

140

Time (min)

Z−

Axi

s A

ccel

erat

ion

(mic

ro−

g)

OARE, Raw Data

CM−1 Experiment Location

MSL−1R

Body Coordinates

MET Start at 007/08:46:53.100

Raw OARE Data and SOFBALL Radiometry Data from STS−94

0

0.05

0.1

0.15

0.2

Rad

iatio

n (V

olts

)

VRCS ActivityVRCS Activity

MET Start at 00/08:46:53.100

Radiometer 1 –––––––– RedRadiometer 2 –––––––– GreenRadiometer 3 –––––––– Lt. BlueRadiometer 4 –––––––– BlackOARE data –––––––– Dk. Blue

Figure 10. OARE vs. SOFBALL Radiometry Data (STS-94)

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