Shock and Random Vibration Qualification Tests of … University of Maryland Shock and Random...
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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 vehicle applications (off-road, rough road, etc..) MIPS
Transcript of Shock and Random Vibration Qualification Tests of … University of Maryland Shock and Random...
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 vehicle applications (off-road, rough road, etc..)
MIPS
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Test Plan
Identify natural frequencies • 3D FEA Model, ADS Bitsy• CalcePWA, ADS Graphics Master Test 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 Master
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Natural Frequency AnalyzesADS Bitsy - 3D Finite Element Model
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Natural Frequency AnalysesADS Bitsy – 1st & 2nd Modes
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Natural Frequency AnalyzesADS Graphics Master – CalcePWA
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Natural Frequency AnalysesADS Graphics Master – 1st & 2nd Modes
1st Mode
2nd Mode
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Shock TestingMil-Std-810 Section 516.4 Part I-3.3.c.2
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0 0.05 0.1 0.15 0.2 0.25Time (sec)
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Product must surviveThe application of three half-sine shock impulses along each of the orthogonal axes of the board.• 40 g amplitude• 6-9 ms duration• 18 shocks per board
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Shock TestingComparison of SAE profile to
Mil-Std-810 Section 516.4 Part I-3.3.c.2
The mil spec test is a more severe test
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TT
PSDPSD
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Vibration Test ProfileTime compression 1000 hours to 1 hour
d = 6.2 to 6.4 for electronic equipment
T1 = 1000 hours
T2 = 1 hours
Compression multiplier is 9
The number of cycles to failureis directly proportional to the time to failure:Nf α TThe stress is a function of the applied acceleration and frequency (PSD)
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Example
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Vibration TestingMil-Std-810 Section 514.4, part I-4.7
PSD curve modifiedto provide timecompression and to fit within the operational limits of the electro-dynamic shaker
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Vibration TestingSAE Profile Comparison
Modified profile qualifies the parts for both these profiles
SAE J1211 – Dwell at applicable major resonant frequencies
Critical frequencyrange
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Test EquipmentElectro-Dynamic Shaker
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ADS Graphics Master ADS BITSY
Shock
Out-of-Plane Orientation Pass Pass
In-Plane Orientation 1 Pass Pass
In-Plane Orientation 2 Pass Pass
Vibration
Out-of-Plane Orientation Pass Pass
In-Plane Orientation 1 Pass Pass
In-Plane Orientation 2 Pass Pass
Shock and Vibration Test ResultsADS Bitsy and Graphics Master
