TCS3 Servo System Proposed Design
Why Model? Meet Resolution Requirements What Resolution Encoder to use? Velocity Configuration PID Values Wind Loading Tests
Tests 10 arcsec Offset 15 arcsec/sec Track Open/Closed Loop Response Wind Loading Frequency Sweep
JPL System
JPL Step
JPL Track
Present System vs. JPL System Added Transfer Functions Added Quantization Blocks Added Rate Limiter Dual Opposing Motor Mechanical Model Disturbance Rejection in Velocity loop Adjust C3 and C4 gains to reflect present system components
JPL 5 DOF Mechanical Model
Matlab 5 DOF Mechanical Model
IRTF 6 DOF Mechanical Model
Matlab 6 DOF Mechanical Model
Wind Loading Calculations
Matlab Model for Wind Disturbances
Mechanical Model Simulation
Present System
Present Tachometer Loop
Present Step
Present Track
Present Track with Wind
Present System Response Testing
Present Open Loop
Present Closed Loop
HA 15srcsec/sec Track
Dec 15 arcsec/sec Track
HA 600 arcsec Offset
HA 1200 arcsec Offset
Dec 1200 arcsec Offset
HA Slew
Dec Slew
Proposed System vs. Present Delta Tau PMAC Configuration for PID Use present Tachometer Loop Adjust C4 gain for 16 bit DAC
Proposed System
Proposed Tachometer Loop
Proposed Step 8P
Proposed Step 35P
Proposed Step 50P
Proposed Step 100P
Proposed Track with Wind 8P
Proposed Track with Wind 35P
Proposed Track with Wind 50P
Proposed Track with Wind 100P
Proposed Track without Wind 50P
Proposed Negative Track without Wind 50P
Proposed Track without Disturbance Rejection
Proposed System Response Testing
Proposed Open Loop
Proposed Closed Loop
Proposed System Sweep Testing
Proposed System Sweep
Encoder Resolution Encoder Resolution 1 arcsec 0.5 arcsec 0.1 arcsec 0.05 arcsec 0.02 arcsec 0.01 arcsec Present System (track – no wind) Present System (step – no wind) Present System (track – wind) Present System (step – wind) Proposed System (track – no wind) Proposed System (step - no wind) Proposed System (track – wind) Proposed System (step - wind)
Conclusion PMAC will meet 0.1 arcsec resolution requirement Present Encoder will meet resolution requirement Present Tachometer loop is necessary Starting PID Values