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Articles About NASA

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1 NASA Gets Down and Dirty for SARJ Solution (September/October 2008)

For more than 10 months, NASA ground engineers and International Space Station (ISS) astronauts have been struggling with a perplexing malfunction of one of the stationís two solar array rotary joints (SARJ).

2 One Small Step Towards Mars (July 2014)

In the June issue of our sister publication -- Power Transmission Engineering -- the Power Play feature (Destination Mars! -- pg. 64) was devoted to NASAís Mars-oriented LDSD (Low Density Supersonic Decelerator) project...

3 3-D Printing: We Ain't Seen Nothing Yet (March/April 2015)

NASA is now 3-D-printing spare parts up at the ISS (International Space Station). And in zero-gravity environments. And some of these parts are small gears and actuators, for starters. Every indication is that the list of power transmission-type parts to be converted will soon grow.

4 Space Station Solar Power Compromised by Balky SARJ Unit (March/April 2008)

Undue vibrations, power spikes and grit give NASA pause.

5 Test Facility Simulation Results for Aerospace Loss-of-Lubrication of Spur Gears (June 2015)

Prior to receiving airworthiness certification, extensive testing is required during the development of rotary wing aircraft drive systems. Many of these tests are conducted to demonstrate the drive systemís ability to operate at extreme conditions, i.e. ó beyond that called for in the normal to maximum power operating range.

6 Aerospace Gearing Research - An Update (June 2009)

A look at several American organizations doing cutting edge gear-related research for aerospace applications.

7 Leading by Example - Remember When (September/October 2014)

In January of this year we at Gear Technology got hip to the fact-in un-hip, belated fashion - that we needed a Blog Site and someone to do the blogging. Lucky for us, we already had that someone right here - in plain sight. That someone was Charles D. Schultz, P.E.

8 SARJ Repairs Show Promise for Space Station Solar Power (January/February 2009)

Much has happened since we last reported on the malfunctioning solar array rotary joint (SARJ) attached to the International Space Station. Space shuttle Endeavour dropped in for a two-week visit in November during which repairs were made and invaluable data collected.

9 Sally Ride Science: Creativity, Collaboration and Fun (August 2014)

Sally Ride Science will be featured at IMTS 2014.

10 Automated Acoustic Intensity Measurements and the Effect of Gear Tooth Profile on Noise (March/April 1988)

The NASA Lewis Research Center investigated the effect of tooth profile on the acoustic behavior of spur gears through experimental techniques. The tests were conducted by Cleveland State University (CSU) in NASA Lewis' spur gear testing apparatus. Acoustic intensity (AI) measurements of the apparatus were obtained using a Robotic Acoustic Intensity Measurement System (RAIMS). This system was developed by CSU for NASA to evaluate the usefulness of a highly automated acoustic intensity measurement tool in the reverberant environment of gear transmission test cells.

11 NASA's Return to Flight (May 2007)

Gear specialists at the NASA Glenn Research facility helped determine it was safe for the space shuttle to fly again.

12 Predicted Effect of Dynamic Load on Pitting Fatigue Life for Low-Contact-Ratio Spur Gears (March/April 1989)

How dynamic load affects the pitting fatigue life of external spur gears was predicted by using NASA computer program TELSGE. TELSGE was modified to include an improved gear tooth stiffness model, a stiffness-dynamic load iteration scheme and a pitting-fatigue-life prediction analysis for a gear mesh. The analysis used the NASA gear life model developed by Coy, methods of probability and statistics and gear tooth dynamic loads to predict life. In general, gear life predictions based on dynamic loads differed significantly from those based on static loads, with the predictions being strongly influenced by the maximum dynamic load during contact.

13 Influence of Gear Design on Gearbox Radiated Noise (January/February 1998)

A major source of helicopter cabin noise (which has been measured at over 100 decibels sound pressure level) is the gearbox. Reduction of this noise is a NASA and U.S. Army goal. A requirement for the Army/NASA Advanced Rotorcraft Transmission project was a 10 dB noise reduction compared to current designs.

14 Tooth Modification and Spur Gear Tooth Strain (September/October 1996)

A major source of helicopter cabin noise (which has been measured at over 100 decibels sound pressure level) is the gear box. Reduction of this noise is a NASA and U.S. Army goal.

15 Hybrid Gear Preliminary Results: Application of Composites to Dynamic Mechanical Components (May 2013)

Composite spur gears were designed, fabricated and tested at NASA Glenn Research Center. The composite web was bonded only to the inner and outer hexagonal features that were machined from an initially all-metallic aerospace quality spur gear. The hybrid gear was tested against an all-steel gear and against a mating hybrid gear. Initial results indicate that this type of hybrid design may have a dramatic effect on drive system weight without sacrificing strength.

16 Times Arent A-Changin for Broaching, and Thats Just Fine (May 2015)

In 1964, a young and tidy Bob Dylan sang away in that infamous voice of his, all nasally and grating yet wonderfully distinct, opining to the fervent masses: ďThe times, they are a-changin.Ē

News Items About NASA

1 SDP/SI Donates Components to NASA Challenge (March 28, 2013)
Stock Drive Products / Sterling Instrument (SDP/SI) recently announced the donation of components to Team SpacePRIDE for the NASA Lunar ... Read News