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Senior Mechanical Engineering Project Definition

Senior Mechanical Engineering Project Definition. Mike MacGregor. Problem Statement & Scope. Problem Statement: Need to enable Larrabee PCI graphics card by designing a cooling solution that meets

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Senior Mechanical Engineering Project Definition

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  1. Senior Mechanical Engineering Project Definition Mike MacGregor

  2. 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

  3. 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

  4. Constraint #1: Fan • 5 fans to be supplied by Intel • Fan supplier: AVC • Fan model series: BA10033

  5. 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 PCI Card 3cm TTV

  6. (3,30) (16,30) acceleration in g’s (19,0) (0,0) msec 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

  7. BACKUP

  8. Starting Materials: S&V Fixture and MB (not pictured)

  9. Step 1: Install MB • Install the MB onto the fixture with qty 10, 6-32 screws torqued between 6 to 10 in-lbf

  10. 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

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