Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
IV EELV A Thermal Hydraulic Model for Expendable Launch Vehicles Michael Berglund Delta IV Launch Vehicle Development May 16-17, 2000 Created by Michael Berglund 1 IV EELV Outline Point 1 - Correlation with Test Data Rocketdyne Thermal analysis DT-1 RCN Point 2 - Design Tool, Test Transient Conditions Point 3 - Common Modeling System Rocketdyne Controls group Point 4 - Good Customer Support New Parts Specified Modeling Hydraulic Systems Using EASY5 Summary of EASY5 Process Created by Michael Berglund 2 IV Easy5 Model of RS-68 Hydraulic System EELV Heat Transfer Analysis: EJ Reott ACTUATOR VERIFICATION VM fluid output temp TF2VM FO fluid output temp (corrected) TF2 Matches MHI Data (error +/- 3.7%) Created by Michael Berglund 3 IV Easy5 Model of RS-68 Hydraulic System EELV Heat Transfer Analysis: EJ Reott LINE SEGMENT VERIFICATION Heat transfer from fluid to wall (BTUH) QFPI Heat transfer from fluid to wall (corrected) QFPI11 Wall temp TWPI Wall temp (corrected) TWPI11 Matches Calculation (error +/- 0.4%) Created by Michael Berglund 4 IV EELV Fluid Temp Rise Across Orifice TVC1, TVC2, RCN EASY5 model: oil temp rise across orifice results: T = 76°F Hand Calculations: Oil temp rise across orifice (same conditions) results: T = 75.9°F Created by Michael Berglund 5 IV EELV Created by Michael Berglund Fluid Temperature Rise In Flight 6 IV EELV Development Test Models (major assumptions) Development Test Models DT_RCN (boundary conditions, spring force) DT_TVC (boundary conditions, spring + constant force) DT_Breadboard (valves simulating flow demand for all actuators, single valve representing all 4 engine valves) DT_System (TVC, RCN actuators included, single valve representing all 4 engine valves) Hydraulic_System (same as DT_System but with engine valves from Rocketdyne) Created by Michael Berglund 7 IV EELV Created by Michael Berglund EASY5 DT-1 RCN Model 8 IV EELV RCN Velocity and Stroke Stroke & Velocity vs. Time 20.0 Velocity Transducer 15.0 LVDT-in. Calculated LVDT Stroke-in, Velocity-in/sec 10.0 5.0 0.0 -5.0 -10.0 -15.0 -20.0 0.0 0.5 1.0 1.5 2.0 2.5 Time (sec) DT-1 RCN Created by Michael Berglund EASY5 9 IV EELV Force Data 3000 Force 2000 Force (lb) 1000 0 -1000 -2000 -3000 0.0 0.5 1.0 1.5 2.0 2.5 Time (sec) DT-1 RCN Created by Michael Berglund EASY5 10 IV EELV DT-1 RCN & Model Correlation Force Data 3000 Force 2000 Force (lb) 1000 0 -1000 -2000 -3000 0.0 0.5 1.0 1.5 2.0 2.5 Time (se c) Spring Characteristics of Air Spring 3000 2000 Force (lbs) 1000 0 -1000 -2000 -3000 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 1.0 2.0 3.0 4.0 5.0 Stroke (in) Stroke vs. Time 10.00 LVDT-in. Stroke-in, Velocity-in/sec 5.00 0.00 -5.00 -10.00 0.0 0.5 1.0 1.5 2.0 2.5 Time (se c) DT-1 RCN Created by Michael Berglund EASY5 11 IV EELV Common Modeling System Rocketdyne Received and integrated Rocketdyne’s EASY5 model into CBC EASY5 model Controls Group Created by Michael Berglund 12 IV EELV New Components Found in New EASY5 Library AD (accumulator with an inlet and outlet), Qin, Qout for both fluid and gas, EFX heat flux PI - Pipe with heat flux VO - Volumes with heat flux Created by Michael Berglund 13 IV EELV Created by Michael Berglund New Accumulator 14 IV EELV EASY5 New Components New Parameters: EFX and QIN EFX defines additional energy flux into the volume wall. EFX units are BTUH/in2. QIN defines additional heat generated internally within the fluid. QIN units are BTUH Created by Michael Berglund 15 IV EELV Conclusions EASY5 Test correlation Design tool, test transient conditions Common modeling system New parts specified Recommendation: Continue to use EASY5 to model hydraulic system Created by Michael Berglund 16 IV EELV Modeling Hydraulic Systems Using EASY5 EASY5 Process Building a Model Created by Michael Berglund 17 IV EELV EASY5 Process Define system and the EASY5 model objective Build Model by Placing and Linking the Components in the Correct Sequence (use only default or port connection method) Create an Executable File Find an Initial Operating Point (All Time Derivatives = Zero) If the Model Equations Converge, Run a Simulation Plot Any Output As a Function of Time Created by Michael Berglund 18 IV EELV Building the Model Start with simple foundation model, ie, valves for actuators, volumes instead of accumulators, no tabular functions, average values Run to see if results make sense, check with other team members (in the ball park values) Build on model, make more complex if preliminary model checks out Make thermodynamic model as simple as reasonably possible because of potentially large simulation times Created by Michael Berglund 19 IV EELV Actuators Approximated by Metering Valves Similar to Breadboard Development Test set-up Created by Michael Berglund 20 IV EELV Created by Michael Berglund Model of TVC Actuator 21 IV EELV Created by Michael Berglund 22 IV EELV Created by Michael Berglund 23 IV EELV Created by Michael Berglund 24