TCS3 Servo System Proposed Design. Why Model? Meet Resolution Requirements What Resolution Encoder to use? Velocity Configuration PID Values Wind Loading.

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Presentation transcript:

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