PACS FPFPU Thermal and Structure Analysis

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PACS FPFPUThermal and Structure Analysis

• Dr. G. Wanderer
• CASE GmbH

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FPFPU Housing Thermal and Structure Analysis

• Thermal Model
• Thermal Analysis
• FE-Model
• Eigenfrequencies / Eigenmodes
• Sine- and Random Response

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Spectrometer Operation
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Photometer Operation
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PACS Cool-Down
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PACS Photometer Recycling(120 min. average
dissipation)
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PACS Photometer Recycling(10 min. peak
dissipation)
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PACS Photometer Recycling(10 min. peak
dissipation)
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FE-Model

• FE-Model for NASTRAN V70.7
• Approx. 30000 Nodes
• each part of FPU-housing is separat model
• structural connection by RBE2 or CELAS at bolt
  positions (coupling only displacements)
• Plate element used for large surfaces
• additional volume elements at stiffened regions

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Eigenfrequencies and Effective Masses of current
design
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Response Analysis
Damping for response analysis 2 structural
(Q50) Sine Vibration Level (Qual.)
Longitudinal (Z in FEM) 5 - 40 Hz 20g, 40 -
100 Hz 10 g Lateral (XY in FEM) 5 -
100 Hz 14 g Random Vibration Level (Qual.)
20 - 100 Hz 6 db/Oct 100 - 300 Hz
0,05g2/Hz 300 - 2000 Hz -6 db/Oct
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Response at Chopper, Sine X, 1g
Response in X
Response in Y
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Response at Chopper, Random Qualification X
Response in X
Response in Y