below are the meeting minutes and actions taken during today's Tower A Environmental Test TRR (Vibe and Thermal).
R. Johnson, J. Ku, J. Goodman, P. Baird, Chris Fransen,
R. Bright, M. Opie, E. Roulo,
D. Rich, M. Nordby, P. Hascall, H. Tajima, S. Lundgren N. Menon, N.
Mazziotta, F. Giordano, S. Raino,
Here are the action items and
comments John Ku recorded during today’s TRR. “A” denotes an action item,
“C” denotes a comment.
- A: If time permits, do a “very low level” sine
sweep run to characterize/understand the lateral mode frequency shift
observed from Z (cross axis response @ ~180Hz) to X and Y (in axis
response @ ~150 Hz)
Consider cutting out some preliminary runs to save time, especially the
-3dB run. Blackline procedure as
Widen notch bandwidth on random vibration profile to account for frequency
shift, i.e. you have to step through increasing levels to reach full level
and the resonance can shift during this stepping – the notch bandwidth
should be wide enough to capture this total drift.
Mike Opie to update slides 11 and 12 to reflect
test duration (change from 120s to 60s)
SLAC and INFN to reopen major NCRs to discuss
cable corner clip installation issues, uninstalled hardware, damaged helicoils, flexure out-of-spec conditions.
Mike and Nicola to follow same settings used on EM test (p7 of procedure)
Chris Fransen to check pre-post test alignment
procedure documented in TKR Assembly Procedure.
Torque striping of stud/flexure should be visually inspected between axes.
Locking feature on sidewalls WAS used.
Pre/Post test electrical test WILL identify new breaks in wirebonds
(closed): Check basis of 4g limit in Z low-level sine sweep. Mike
and Eric confirmed that these levels were based on observed test levels.
John Ku to update procedure to verify Grade 8 or equivalent bolt is used
in step 120 of p.24.
Pat Hascall to provide TRR checklist to Dave Rich
Pat Hascall to make list of additional steps needed to comply with above
As for action item need dates, they
all need to be resolved prior to the start of the test.
VACUUM TEST TRR-
A: (Jack Goodman) Define bake-out criteria
C: Thermal balance will be performed on Tower B if schedule test time is
not available for Tower A.
A: (Nanda Menon) Provide list of spare
EGSE that should be on-hand at Alenia to protect
schedule if an EGSE problem were to occur. Denote which spare
EGSE materials that INFN will supply to support Tower A
testing. In addition, denote the items that should be on-hand (long
term) to support future Environmental Testing. Long term
spares list will have be reviewed to determine where these items can be
A: (Hascall/Goodman/Mazziotta) Define and
place under configuration control the required reference documents (ref.
slide #5 of presentation) that needs to be controlled under configuration
A: (Tracker Management Team, 12/10/04)
Finalize the protoflight temperatures
requirements for Tower A Thermal Vacuum Testing. The current requirement
is -30 to +50 deg. C. Due to NCR investigation of broken wire bonds
on SSD Ladders on Tower A, further tray level testing is being performed to
evaluate design temperature margin.
A: (N. Mazziotta) Edit procedure to remove
reference to inversion of Tower at Alenia for
installation of thermal couples. Thermal couples located on bottom tray
and tower base plate are installed at Pisa. Ensure that
thermal couple wires are taped down to avoid damage due to vibration testing
C: Jack Goodman cautioned that T/V test team needs to watch temperatures
very carefully when heaters are turned on to prevent temperature overshoot when
A: (N. Mazziotta) Define staff
plan and call-in contact list to support three shift T/V testing.
A: (N. Mazziotta) Update procedure
to document removal of cable support plate for thermal vacuum
configuration. The cable support plate is located directly under the
tower base plate and is used during shipment and vibe testing.
(N. Mazziotta) Ensure that if the test
termination criteria case is hit, that contingency procedures exist to ensure
safety of the test article.
A: (E. Rapposelli TBD) An INFN
mechanical engineer is to review the Alenia Tower lifting
operations. This is a "below CG lift" and is therefore a very
critical lifting operation. It was reported that this configuration lift
was previously performed.
A: (Hascall/Tajima) Review Electrical Functional