Senior Mechanical Engineering Project Definition
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Transcript of Senior Mechanical Engineering Project Definition
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Senior Mechanical Engineering Project Definition
Mike MacGregor
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Problem Statement & Scope
Problem Statement: Need to enable Larrabee PCI graphics card by designing a cooling solution that meets– Volumetric/dimensional constraints of the PCI card form factor as well as
the chip and circuit board that it cools– PCI Express™ x16 Graphics 150W-ATX Specification Revision 1.0 & PCIe 2.0 Spec Compliant– Card form factor: 2 slot, Full height, 240mm length
– Thermal performance requirements of the Graphics Processor Unit (GPU) under a worst-case use condition
– Structural performance requirements driven by shipping and handling use condition
Scope– Fan & thermal test vehicle to be supplied by Intel
– Competitive research, feasibility analysis, quantitative evaluation of multiple design concepts, identification of final design concept, detailed design and design analysis, validation through laboratory testing
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Thermal & Acoustic Requirements
GPU Thermal Design Power (TDP) 70 Watts Fan max. power 8 Watts Max. T ambient 35 °C Typical T ambient 25 °C T rise to card inlet 10 °C GPU T case max. 85 °C
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Constraint #1: Fan
5 fans to be supplied by Intel Fan supplier: AVC Fan model series: BA10033
Adobe Acrobat Document
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Constraint #2 Thermal Test Vehicle (TTV)
Heater to be spec’d from Omega supplier catalog– KHR-3/10 (3 cm diameter, 70 W max.)
– http://www.omega.com/pptst/KHR_KHLV_KH.html
PCI card with assembled heater and heat spreader to be supplied by Intel
3cm3cmTTVTTV
PCI CardPCI Card
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Structural Requirements
Design must pass shock test– PCI card assembled with ATX MB to rigid plate with rear panel I/O bracket
(see backup slides)
– Hockey stick max retention force: 29 lbf
– Shock test input in all 6 directions: trapezoid, 30g amplitude
Expectations – derivation of worst-case DAF for HS mass
– disposition of which shock directions pose the greatest risk to SJR as well as RM component loading
– estimation of max stress and deflection of RM
(0,0)(0,0)
acce
lera
tion in
g’s
acce
lera
tion in
g’s
msecmsec
(3,30)(3,30) (16,30)(16,30)
(19,0)(19,0)
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BACKUP
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Starting Materials: S&V Fixture and MB (not pictured)
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Step 1: Install MB
Install the MB onto the fixture with qty 10, 6-32 screws torqued between 6 to 10 in-lbf
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Step 2: Install Card
Seat the card into the PCI x16 connector and check that the hockey stick feature is engaged Install the qty 2, 6-32 screws torqued between 6 to 10 in-lbf to secure card to I/O bracket