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3 POINT BENDING TEST : Varying loads and spans Variables measured in the gravity center: Deflections with vision machine Strains with gauges in longitudinal and transverse directions Estimated Parameters: E facings G core
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VIBRATION TEST WITH CONSTRAINTS and FREE BOUNDARY CONDITIONS : Test Positions: Suspended and Restricted Applied Loads: Impulse and Harmonic Loads Variables measured in different points along the petal: Accelerations and forces Estimated parameters : Mode shapes and its Natural frequencies. Suspended Restricted
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Tª Box Air (ºC) Coolant Tª Pipes_Coolant (ºC) Surface Strains (µm) T ª Surface Petal (ºC) 12H2OH2O NoYes 12.5H2OH2O27.5NoYes 10-- YesNo 10.7CO 2 -27Yes 11.1 Chiller _FRICOFIN -25Yes THERMAL TEST CONDITIONS AND MEASUREMENTS : Variables measured along the petal: Transverse Strains with capacity sensors Superficial Temperatures with IR camera and PT100s.
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THERMAL STRESS TEST : Chiller with H 2 O at -25ºC: 50 cooling cycles. Estimated Parameters: Heat transmission Faults Peeling off THERMAL TEST: Chiller with CO2 at -35ºC: 10 cooling cycles. Estimated Parameters: Heat transmission
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STRUCTURAL MODEL : With structural shell elements (Shell 99)for Pipes, CF Channels and Facings. With solid elements for the rest (Solid 95). In order to simulate Modal analysis and Stiffness analysis. THERMAL MODEL: With Solid elements (Solid 90) for all components and facings with 3 volumes. In order to simulate steady state. THERMAL-STRUCTURAL MODEL: With Thermal-Structural Solid elements (Solid 226) for all components and facings with 3 volumes. In order to simulate thermal stress cycles.
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VALIDATION AND VERIFICATION OF THE MODEL : 4 Validity checks: Unit Enforced Displacement and Rotation Free-Free Dynamics with a Stiffness Equilibrium Check Unit Gravity Loading Unit Temperature Increase VALIDATION WITH EXPERIMENTAL DATA: Dynamic Test: Free Vibration Modal Analysis Restricted Petal Modal Analysis with Impulse Load applied Restricted Petal Modal Analysis with frequencies sweep. Stiffness Test Steady State Thermal Test Thermal Stress Test
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STEADY STATE THERMAL ANALYSIS : Comparison between tests and Ansys results on facings surfaces RESULTS Tª Box Air (ºC) Coolant Tª Pipes_Coolant (ºC) T ª Surface Petal_MAX (ºC) T ª Surface Petal _MIN (ºC) ε_Sensor A (µm) ε_Sensor B (µm) ε_Sensor C (µm) ε_Sensor D (µm) TEST12H2OH2O 12.811.2-- ANSYS12H2OH2O -- TEST12.5H2OH2O27.523.618.9-- ANSYS12.5H2OH2O27.527.423.71-- TEST10-- -263-252-207-88 ANSYS10-- TEST10.7CO 2 -27---25-65-68-64-6 ANSYS10.7CO 2 -27-20.63-26.27 TEST11.1 Chiller _FRICOFIN -25---20-58-56-4710 ANSYS11.1 Chiller _FRICOFIN -25-19-24.9 Note: the convection film coefficient for H 2 O is 10.000W/m 2 ºK (forced convection), for CO 2 is 8.000 W/m 2 ºK, for the chiller coolant 10.000 W/m 2 ºK and for dry air 5 W/m 2 ºK.
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STEADY STATE THERMAL ANALYSIS : CO 2 -27ºC DRY AIR 10.7ºC Chiller -25ºC DRY AIR 11.1ºC H 2 O 27.5ºC DRY AIR 12.5ºC
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STIFFNESS ANALYSIS : Comparison between tests sand Ansys results SPAN (mm) δ_Half Height Section (mm) 250 g500 g750 g1000 g1250 g 200 0.036 0.0610.0560.062 0.041 Ansys: 250 0.0680.1120.0830.101 0.096 300 0.0570.0870.0970.110 0.142 350 0.0160.0270.0620.090 0.143 400 0.0840.1040.1360.168 0.211 450 0.0940.1300.1660.217 0.290 500 0.0660.1520.1910.258 0.316 550 0.0760.1940.2870.3110.390 Ansys: Ansys: 0.576Ansys: 0.72
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STIFFNESS ANALYSIS : Analysis with SPAN 550 mm and LOAD 1250 gr DEFLECTIONSVON MISSES STRESSES
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MODAL ANALYSIS : Free Boundary conditions MODE Frequency (Hz) 10.12949e-01 20.16566e-01 30.23572e-01 47.50073 57.6362 621.366 722.407 826.313 FIRST SIX MODES = MOVEMENT OF RIGID SOLID MIN
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