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Operations Laboratory

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NASA MSFC Engineering DirectorateHuntsville, Alabama

TIR overview for

UBNT (Ultrasonic Background Noise

Test)

Oct 18, 2012

Ina SenEO20

(256) [email protected]

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UBNT Team PI: Dr. Eric Madaras, Senior Research Scientist

NASA Langley Research Center,office: 757-864-4993, cell: 757-593-0049, e-mail: [email protected]\

PIM: Jeff Durham / OZ6 Phone: 281-226-4505

FAX: 281-226-6582e-mail: [email protected]

Crew office Rep: Brad Townsend / CB111office: 281-244-1994e-mail: [email protected]

Ops Lead: Ina SenNASA MSFCoffice: 256-544-1583e-mail: [email protected]

mailto:[email protected]%5C

mailto:[email protected]

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UBNT Overview UBNT is fundamental to using ultrasound as a technology

for leak location and vehicle health monitoring systems for future spacecrafts

To acquire a true data for future ultrasonic leak detections, the structure-borne ultrasonic background noises that exist within ISS structures’ pressure shell need to be understood

UBNT measures the on-orbit modules varied dynamic background noises generated by other systems on station

Future ultrasonic leak detection system’s ultrasound threshold design for ISS will take the background noise determined by UBNT into account

Impact

Structural Waves

Piezoelectric Sensors

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Continued UBNT Overview Install several ultrasonic sensors at a set of strategically

located sites in a module. Strategically located means a balance of conditions: Easy locations to reach for quick and simple installation. Spread out over a diverse set of locations in a module. Some of the locations will target anticipated high background

noise sources. After installation, the system will be activated by the crew

and run in an automated mode minimizing crew interaction. Occasional use of the SSC to communicate with the system is required for the data collection.

In its automatic data acquisition or “schedule” mode, the system will acquire data over several short time periods to sample the background noise levels during various on-orbit activities.

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UBNT System Overview

910Mhz

DIDS

Sensor Cable• length: 2 meters

DIDS Power Supply Battery Pack2 Energizer L91 AA batteries3.0 VDC output (nominal)

Antenna/Data Cable• length: 2 meters

910MhzSSC

DIDS Receiver connected to SSC

via USB

Power supply and DIDS sensor units attached to ISS Module pressure wall using velcro.

Piezoelectric sensors attached using pre-certified adhesives (see backup).

SSCFile Server

OCA/Ground

Eth

erne

t cab

le

UBNT Team

Digital Wave – Piezoelectric Sensor:• Model B-225.5

• Frequency bandwidth: 50kHz - 400kHz• Temperature range: -50°C to +100°C

• Dimensions: 1.5 cm diameter. x 2.0 cm H• Connector type: Microdot

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UBNT Hardware

USB Cable and DIDS Receiver with Antenna

DIDS Data Recorder with 4 sensor cables and piezoelectric sensors

AA battery pack

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UBNT Installation Location : Endcone / Hatch

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UBNT Installation Location : Standard Rack Bay

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UBNT Status Currently status: all UBNT hardware is on orbit and H/W was integrated by OSO as UBNT was categorized as a system A training video was developed by Dan Tani and will be used on-orbit for crew training prior to UBNT operationsUBNT operations were hard scheduled last November, but were not performed due to ATV-3 power issues at that time, that resulted in cancellation of UBNT operationsthe installation around the LAB endcone hatch for the fwd or aft location was task listed but no performed; A ‘PCM like matrix’ was developed and agreed on by POIF and the OSO group

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Agreements for on-orbit ops Agreements for operations are as follows:

PPM will be scheduling UBNT’s H/W installation ops OSO will be supporting the H/W installation and check-out activities

performed by the crew executing crew procedures owned by OSO and residing on the SODF shelf in the flight library

PPM will be scheduling UBNT test ops (the specific GMT windows will be determined by the PI and OSO to sample the background noise levels during various on-orbit transients/activities the scientist is particularly interested in)

POIC is responsible for the UBNT operations (crew activates communications between SSC and DIDS data recorder and transfers data) executing crew procedures owned by POIF and residing on the PODF shelf in the flight library

PPM will timeline OCA activities to downlink data (not proprietary data files)

Data erasing from the DIDS recorder is not anticipated since it can store approx 650MB in total. Only if a decision was made to maybe recover the micro SD card at some later date, the erase command would be needed

PAR process will be used by POIC to document all anomalies.

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Crew Interfaces with UBNT Hardware Setup (7 DIDS sensor kits max per ISS Module) Transducer verification by testing communication between

SSC and sensors UBNT operations:

Loading a Test Session residing on the SSC for either one or multiple RSUs, (interface is DIDS S/W app that is available on any SSC) and start the test

Downloading summary data files from DIDS recorder to SSC(15KB/module),

Downloading raw data files from DIDS recorder to the SSC (approx.50 files per module with 65KB per file)

Downloading test configuration files from SSC to DIDS recorder for more test operations

Stow

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