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PACS Housing: Structure Analysis. Dr. G. Wanderer CASE GmbH. Loads Strength Analysis of Housing Parts Housing Pins and Bolts Notching of Sine- and Random Qualification Loads Suspension Analysis Brackets Pins and Bolts. Dynamic and Static Loads. Quasistatic: - PowerPoint PPT Presentation
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PACS Structure Analysis 1
PACS IBDR 27/28 Feb 2002
PACS Housing: Structure Analysis
Dr. G. WandererCASE GmbH
PACS Structure Analysis 2
PACS IBDR 27/28 Feb 2002
Loads Strength Analysis of Housing Parts
Housing Pins and Bolts
Notching of Sine- and Random Qualification Loads
Suspension Analysis Brackets Pins and Bolts
PACS Structure Analysis 3
PACS IBDR 27/28 Feb 2002
Dynamic and Static LoadsQuasistatic: LC1 longitudinal 20g, lateral 2g
LC2 lateral 14 g
Sine Vibration longitudinal 5- 40 Hz 20g
40-100 Hz 10g
lateral 5-100 Hz 14g
Random Vibration 20 - 100 Hz +6 dB/Oct
100 - 300 Hz 0,05 g2/Hz
300 - 2000 Hz -6 dB/Oct
PACS Structure Analysis 4
PACS IBDR 27/28 Feb 2002
Material
The PACS Housing is build of AW 6061T6,
Bolts and Pins are of Typ A4-70 (i. e. Steel AISI 316)Ref: MIL HDBK-5H, ESACRACK user´s manual
Property at RT at 4K UnitE-Modulus 68260 78500 N/mm2G-Modulus 26200 30130 N/mm2Density 2710 2710 kg/m3Ultimate Strength 289 430 N/mm2Yield Strength 241 325 N/mm2CTE 24,0 14,4 10-6 1/K
Property at RT at 4K UnitE-Modulus 216000 240000 N/mm2G-Modulus 83000 91000 N/mm2Density 7900 7900 kg/m3Ultimate Strength 700 1448 N/mm2Yield Strength 450 545 N/mm2CTE 15,4 10,4 10-6 1/K
PACS Structure Analysis 5
PACS IBDR 27/28 Feb 2002
Spectrometer Housing
Spectrometer Housing is the highest loaded part except Suspension
Stresses in Spectrometer Housing:
Load Case Stress [MPa]LC1 75,9LC2 76,2Sine Qual. X 63,5Sine Qual. Y 197,0Sine Qual. Z 197,1Random Qual X 228Random Qual Y 182Random Qual Z 274
M.o.S yield 325
2741,110,08
M.o.S ult. 430
2741,510,04
PACS Structure Analysis 6
PACS IBDR 27/28 Feb 2002
Spectrometer Housing
PACS Structure Analysis 7
PACS IBDR 27/28 Feb 2002
Pins And BoltsLoad Case Axial Force Shear Force
Sine X 687 522Sine Y 837 567Sine Z 1988 1046Random X 1155 1326Random Y 1648 1162Random Z 2343 1330
Part Material Thickness CTEBolt M6 A4-70 10.4Washer A4-70 1.6 mm 10.4Flange AW 6061T6 6 mm 14.4Insert
Tightening Moment 8.3+/- 0.5 NmAxial Force +/-2577 N Shear Force 1464.00 N
Temperature Range -269°C ... 20°C
Nominal Diameter 6.00 mmPitch Diameter 5.35 mmCore Diameter 4.77 mmStress Cross Section 20.12 mm2Clamp Length 7.60 mmElastic Resilence of Bolt 5.30E-06 mm/NElastic Resilence of Clamped P. 2.02E-06 mm/N
Tightening Force 1325.9 ... 6062.21 N Force Loss due to Settings 413.00 N Force Loss due to Temperature 2166.00 N
TighteningAxial Stress 301.25 N/mm2Torsional Stress 169.88 N/mm2Equivalent Stress 421.11 N/mm2Yield utilization factor 0.94
Axial LoadAxial Stress 315.96 N/mm2Torsional Stress 169.88 N/mm2Equivalent Stress 431.76 N/mm2Stress Amplitude 14.71 N/mm2Fatigue Limit 61.5 N/mm2
M.o.S (yield) 0.79M.o.S (ultimate) 11.64M.o.S (fatigue) 3.18
Friction in Thread 0,15 .. 0,25Friction between clamped parts0,4 (A l/A l)
PACS Structure Analysis 8
PACS IBDR 27/28 Feb 2002
Notching of Vibration Loads
Accelerometer- Positions with good correlation to I/F Forces
PACS Structure Analysis 9
PACS IBDR 27/28 Feb 2002
Monitoring of I/F Loads
I/F Loads for constant 1g Sine
Reference Grid 13136
PACS Structure Analysis 10
PACS IBDR 27/28 Feb 2002
Notch Procedure an accelerometer is located on the FPU at a place that the measured values correspond
to the interface loads
the notch calculation is based on the FE results scaled to the measured damping values for the major natural modes.
random vibration: the equivalent force is calculated for each major natural mode by integrating the
Force Power Spectral Density (PSD) around the mode The 4-sigma response is limited to the static load level for each major natural
mode. The notch width shall be smaller than 1/3 octave around the natural frequency. The slope of the notch shall be as steep as possible (more than 24dB/Oct, typical
50dB/Oct).
sine vibration: the output is limited to the calculated static interface force in the frequency range
50 to 100 Hz
PACS Structure Analysis 11
PACS IBDR 27/28 Feb 2002
1-Axis Suspension
PACS Structure Analysis 12
PACS IBDR 27/28 Feb 2002
Forces in Suspensions
1 axis fixation 2 axis fixation 3 axis fixationFx Fx Fy Fx Fy Fz
4467 4343 665 6342 190 15233912 2323 5033 1379 5293 16062085 1432 936 1969 753 118126549 6893 3620 9151 3751 78737975 6963 8464 5069 8727 130665019 5084 3687 4490 4724 13066
PACS Structure Analysis 13
PACS IBDR 27/28 Feb 2002
1 axis Suspension
critical load path through pin of diameter 10mm (shear)
= F/(2*A) = 7975N/(2*78mm2) = 50,8N/mm2
s = F*l/8W = 7975N*6mm / (8*98mm3) = 60,9 N/mm2
sMises = 107 MPaM.o.S yield 450
1071,112,8
M.o.S ultimate 700
1071,513,3