This page is dedicated to displaying the modifications
that have taken place to the original COLLIDE hardware as a result of analysis
of the anomalies and malfunctions experienced on STS-90. The modifications
covered three sub-systems of COLLIDE. The modifications took place
to the door sub-system in each of the IBS's, the launcher sub-system in
each of the IBS's and the camera sub-system.
The first step in the design modification process
was to update all or most of the COLLIDE CAD files to a more flexible design
software: SolidWorks (leave COLLIDE
site). This allows the engineers to create excellent graphics
quickly. A view of the full CAD build up of COLLIDE - 2 is
available here (1.1 Mbyte TIFF file).
The major features COLLIDE contained are all present
in COLLIDE - 2. The lowest velocity launchers were redesigned by
Dave Crotser
to allow for an increased spring constant. The first round of launcher
had springs that were too weak to for the projectile to overcome internal
friction in the launcher. Another change is a third stack of batteries
in an additional
Battery
Box. Modifications to the door assembly will be made to
ensure that all IBS doors open properly. Two malfunctioned on STS-90.
The camera containers lost pressure on STS-90 when their glass covers broke,
presumably on launch. New camera containers have been designed.
