PROGRESS REPORT
July 27, 2000
Accomplishments / Status
Summary: Overall, 26% of the work from the Restart Review to delivery
has been completed. The primary focus of this reporting period has been 1) solid
modeling design and deflection analysis of the Post-Slit, Pre-Slit, and OIWFS
Optical Benches, 2) risk reduction testing of the Linear and Rotary drive
prototypes, 3) solid modeling of the Slit/Decker mechanisms, 4) solid modeling
and detail design of the camera barrels, 5) solid model design of the Filter
Wheel mechanism, 6) fabrication of the Environmental Cover mechanism and 7)
fabrication of the motor drive assembly. In
addition, the project plan has been updated and work flow revised to better
reflect current progress and priorities.
Next
Milestone:
The next major project milestone is the release of the OIWFS optical bench for
fabrication in early September 2000.
Earned
Value:
The
following Earned Value information does not reflect the project plan updates and
revisions just completed. These
numbers will be revised accordingly in next month’s report.
BCWS $ 1,416,698
SPI
0.56
BCWP $
788,096
CPI
0.98
ACWP $
806,278
Project
Management:
(34% completed) The project plan
has been revised to reflect changes in the work flow on benches and mechanisms. The revised plan can be viewed on the GNIRS web site at: http://www.noao.edu/ets/gnirs/
under management and planning. Also
new in the management section is a complete list of milestones and milestone
status. The work flow in the
Electronics work package is also undergoing revision, and these changes are due
to be posted on August 10th. The
scheduled delivery date of the completed GNIRS instrument has not changed.
A
quarterly review of the project is scheduled for August 15th.
Materials for this review will be posted on the GNIRS web site on August
11th.
Systems
Engineering:
(92%) The activities in work included 1) structural analysis, 2) linear
prototype, 3) rotary prototype, 4) bearing test fixture.
One systems engineer (project scientist) with part time support from a
staff support scientist (part of the GNIRS systems team) are assigned to these
tasks.
The
structural analysis is in process and will be complete by early August.
Initial results show insignificant worst-case deflections for the
post-slit bench alone. The solid models of the support members, pre-slit and OIWFS
benches and the collimator assembly are in the process of being meshed to the
post-slit bench. The final analysis
will include all these elements, and will be completed by mid-August.
The mechanical engineer assigned to the post-slit bench design is doing
the structural analysis.
The
Linear Mechanism Prototype is in cold test.
The Rotary Mechanism Prototype has completed test.
The bearing test prototype is fabrication.
Mechanical
Design and Fabrication:
(14%) Activities include optical bench solid modeling, slit/decker mechanism
design, camera design, filter wheel design, environmental cover fabrication, and
motor drive assembly fabrication.
Wavefront
Sensor Bench, Post-Slit Optical Bench and Collimator Mount. The
next task for these major bench assemblies is to finish 3D and 2D designs for
fabrication. This is due to be
completed by mid-August. We plan to
have a vendor under contract to fabricate the OIWFS bench by the first week of
September, and the other two benches in fabrication by the end of September.
One engineer and one designer are assigned to these tasks, with part time
support provided by an optical engineer.
The
Slit/Decker mechanism assembly 3D design is 80% complete.
This work is being done in conjunction with the Offner Housing and
Pre-slit Bench 3D design. One engineer is assigned full time to this activity.
The
3D design of the Short Red and Short Blue Camera Barrels is complete.
The short red camera 2D drafting is complete and waiting check before
being sent to fabrication. The short blue camera 2D drafting is 16% complete and is on
hold until the 3D design of the long camera is complete. The camera drive spindle hub 2D drafting is 20% complete.
Two designers are assigned to the camera design tasks.
The
3D solid model design of the Filter Wheel Assembly mechanism is 100% complete.
2D drafting will begin in early August.
One designer is assigned to this task.
The
fabrication of the Environmental Cover Assembly is 85% complete.
This assembly is on hold while prototype parts are being fabricated.
Work should resume in early August.
The
Acquisition Mirror mechanism 2D drafting is 7% complete.
This work is on hold until bench design is completed.
The
Motor Drive Assembly is in fabrication.
Electronics
Design:
(10%) Activities in this work package include 1)electrical and mechanical design
and construction of a simulator for use in software testing, 2) dewar and
mechanism wiring design definition, 3) array interface wiring definition, 4)
cold stationing definition and 5) re-planning of the electronics work flow. One engineer and one graduate EE student intern are assigned
to this work.
The
construction of the Mechanism Simulator started
in June and will complete in August. This
work was held up due to other shop priorities.
Work on
defining dewar wiring, ALADDIN array interfacing details, and detailed mechanism
wiring is in process.
The
electronics engineer has been assigned responsibility for all dewar and system
wiring details, including routing and interface. Wire routing and cold stationing were formerly assigned to a
mechanical engineer.
The
electronics work flow re-planning is being done to better reflect tasks in order
of priority. This work package is
not on the critical path, but certain elements need to be completed for timely
support of software testing.
Software
Development:
(27%) No work has been done on the software this month.
The next step involves software testing using the software test fixture,
which will be completed in August. The
Components Controller Software is 56% complete, and the System Software is 6%
complete. One software engineer is
assigned to this work, and is being assisted by a second engineer on a part time
basis.
Procurement:
(27%) Major activities in this Work Package included optics work at RMI (50%
complete) and monitoring vendor fabrication for the Environmental Cover
Assembly. One parts procurement and
management person is assigned to this task.
Problems / Solutions
An electronics technician will be needed on GNIRS starting in August. ETS is currently advertising to fill this position.
Key Personnel
No changes
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