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MIPSShock and Random Vibration QualificationTests of ADS Computer BoardsCALCE Team: A. Johnson, D. Barker, and N. BlattauObjective: Qualify two ADS computers, the Graphics Master and theBitsy under Mil-Std-810 vibration and shock environments for use invehicle applications (off-road, rough road, etc.)1University of Maryland
Test PlanIdentify natural frequencies 3D FEA Model, ADS Bitsy CalcePWA, ADS Graphics MasterTest Profile Generation Shock, Mil-Std-810 Section 516.4 Part I-3.3.c.2 Vibration, Modified Mil-Std-810 with time compressionElectro-Dynamic Shaker ADS Bitsy ADS Graphic Master2University of Maryland
Natural Frequency AnalyzesADS Bitsy - 3D Finite Element Model3University of Maryland
Natural Frequency AnalysesADS Bitsy – 1st & 2nd Modes4University of Maryland
Natural Frequency AnalyzesADS Graphics Master – CalcePWA5University of Maryland
Natural Frequency AnalysesADS Graphics Master – 1st & 2nd Modes1st Mode2nd Mode6University of Maryland
Shock TestingMil-Std-810 Section 516.4 Part I-3.3.c.245Product must surviveThe application of threehalf-sine shock impulsesalong each of theorthogonal axes of theboard. 40 g amplitude 6-9 ms duration 18 shocks per board40Acceleration (g)3530252015105000.050.10.150.20.25Time (sec)7University of Maryland
Shock TestingComparison of SAE profile toMil-Std-810 Section 516.4 Part I-3.3.c.2The mil spec test isa more severe test8University of Maryland
Vibration Test ProfileTime compression 1000 hours to 1 hourb S1 N 2 N1 S2 Exampled 6.2 to 6.4 for electronicequipmentT1 1000 hoursThe number of cycles to failureis directly proportional to thetime to failure:Nf α TThe stress is a function of theapplied acceleration and frequency(PSD)d2T2 1 hoursCompression multiplier is 99 PSD1 T 2T1 PSD2 University of Maryland
Vibration TestingMil-Std-810 Section 514.4, part I-4.7PSD curve modifiedto provide timecompression and to fitwithin the operationallimits of theelectro-dynamic shaker10University of Maryland
Vibration TestingSAE Profile ComparisonModified profilequalifies the partsfor both these profilesSAE J1211 – Dwell atapplicable majorresonant frequenciesCritical frequencyrange11University of Maryland
Test EquipmentElectro-Dynamic Shaker12University of Maryland
Shock and Vibration Test ResultsADS Bitsy and Graphics MasterADS Graphics MasterADS BITSYOut-of-Plane OrientationPassPassIn-Plane Orientation 1PassPassIn-Plane Orientation 2PassPassOut-of-Plane OrientationPassPassIn-Plane Orientation 1PassPassIn-Plane Orientation 2PassPassShockVibration13University of Maryland
1 University of Maryland Shock and Random Vibration Qualification Tests of ADS Computer Boards CALCE Team: A. Johnson, D. Barker, and N. Blattau Objective: Qualify two ADS computers, the Graphics Master and the Bitsy under Mil-Std-810 vibration and shock environments for use in
