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PACS Housing: Structure Analysis

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:

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PACS Housing: Structure Analysis

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  1. PACS Housing: Structure Analysis • Dr. G. Wanderer • CASE GmbH

  2. Loads • Strength Analysis of Housing Parts • Housing • Pins and Bolts • Notching of Sine- and Random Qualification Loads • Suspension Analysis • Brackets • Pins and Bolts

  3. Dynamic and Static Loads • Quasistatic: • 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

  4. 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

  5. Spectrometer Housing • Spectrometer Housing is the highest loaded part except Suspension • Stresses in Spectrometer Housing:

  6. Spectrometer Housing

  7. Pins And Bolts

  8. Notching of Vibration Loads Accelerometer- Positions with good correlation to I/F Forces

  9. Monitoring of I/F Loads Reference Grid 13136 I/F Loads for constant 1g Sine

  10. 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

  11. 1-Axis Suspension

  12. Forces in Suspensions

  13. 1 axis Suspension • critical load path through pin of diameter 10mm (shear) • t = F/(2*A) = 7975N/(2*78mm2) = 50,8N/mm2 • s = F*l/8W = 7975N*6mm / (8*98mm3) = 60,9 N/mm2 • sMises = 107 MPa

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