Engineering topics

Wanagas, John D.

Publications and source records attributed to Wanagas, John D..

3 records

NASA NTRS1992

Space Station Freedom assembly sequence - History, methods, and status

The goal of SSF assembly sequence design is to yield an operations-capable configuration at each stage of construction. Among the primary considerations of sequence designers are launcher payload-mass constraints, EVA time capabilities, and the ensuring of sufficient functionality at each construction stage. Trade studies are conducted to examine alternative hardware-delivery sequences; every iteration of this process either refines existing margins or reflects the redesign of one of the various elements.

Wanagas, John D.↗

NASA NTRS1992

Impact of restructuring on Space Station Freedom assembly sequence

The Space Station Freedom program and the process used to develop an assembly sequence are overviewed, with special attention given to the outcome of the recent restructuring activity and the positive impact it had on the Space Station design and the assembly sequence. The many technically complex and challenging aspects of the assembly sequence planning are examined, including the launch vehicle integration, the spacecraft systems capability development, and the availability of resources. It is shown that the restructuring reduced the size and the complexity of the Space Station, while the increase of ground integration through the use of preintegrated truss and shortened modules offers a reduced program risk and reduced demands on the STS.

Chung, Steven Y.↗

NASA NTRS1988

Semiautomatic Probe-And-Drogue Attachment Mechanism

Spring-loaded pawls provide quick coupling. As probe enters drogue during coupling, three spring-loaded pawls in probe latch probe in drogue, preventing accidental uncoupling. Then worm-gear mechanism turned by standard 0.25-in. (6.35-mm) tool transfers motion to central threaded shaft, extending cap at tip of probe until all play taken up. This centers probe in drogue and renders coupling pawls to extend again. New mechanism useful for coupling modular components in other applications where ease and security of attachment, precise final alignment, and ease of removal important and where stresses and bending reasonably low.

Wanagas, John D.↗