ACTIVE SUSPENSION TEST PLATFORM

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ACTIVE SUSPENSION TEST PLATFORM
BY

• BRANDON NAYDEN
• CHIAO LIU

ADVISED BY STEVEN GUTSCHLAG
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TABLE OF CONTENTS

• PROJECT SUMMARY
• FUNCTIONAL DESCRIPTION
• SPECIFICATIONS
• BLOCK DIAGRAMS
• INPUTS/OUTPUTS
• EQUIPMENT/PARTS LIST
• DIVISION OF LABOR
• DISCUSSION OF HARDWARE/SOFTWARE
• COMPLETED WORK
• QUESTIONS

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PROJECT SUMMARY

• To simulate a suspension system for testing
  purposes.
• Actuator driven platform.
• Simulation for vehicular applications.

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FUNCTIONAL DESCRIPTION

• A micro-controller controlled H-bridge will
  dictate the movement of the actuator platform
• Movement will be in a vertical fashion
• User input will specify desired duty cycle,
  direction, and waveform
• Digital control feedback
• Liquid crystal display will indicate current user
  desired output

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SPECIFICATIONS

• Platform velocity of 7 inches/second
• Platform load capacity of 200 pounds
• User-friendly interface
• Safe environment

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FINAL PLATFORM CONFIGURATION
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LOW LEVEL SYSTEM BLOCK DIAGRAM
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INPUTS/OUTPUTS

• INPUTS
• Direction
• Duty Cycle
• Waveform
• Displacement
• Position Sensor

• OUTPUTS
• Platform Movement
• Current user input on liquid crystal display

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EQUIPMENT LIST(HARDWARE)

• DC SERVO MOTORS
• IR2213 HIGH LOW DRIVERS
• IRF640 TRANSISTORS
• IRF350 TRANSISTORS
• 4N25 OPTICAL ISOLATORS
• LINEAR ACTUATOR
• MICRO-CONTROLLER
• RHEOSTAT

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EQUIPMENT LIST (ACTUATOR)

• Jack ball screw
• 400
• 7inches/sec _at_200lbs
• Motor and coupling needed

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DIVISION OF LABOR

• Chiao Liu
• Micro-controller to hardware interface
• Protection circuitry
• H-bridge connections
• Hardware and Software debugging
• Brandon Nayden
• H-bridge drive circuitry
• All Software modules
• Hardware and software debugging

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DISCUSSION OF HARDWARE

• 4N25
• OPTICAL
• ISOLATORS
• PROTECTION PURPOSE
• VOLTAGE DRIVE FOR IR2213

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DISCUSSION OF HARDWARE

• IR 2213 HIGH LOW DRIVER
• Drive for H-bridge transistors

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IR2213 Combined with H-bridge

• Each IR2213 drives the high and low side of
  H-Bridge

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H-Bridge and Motor Direction

• H Bridge driven by IR2213

Forward direction of motor
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H-Bridge and Motor Direction
H Bridge driven by IR2213
Reverse direction of motor
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IR2213 Typical Connection
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IR2213 Bootstrap Circuit
Cbs 10uF Cdc .1uF
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IR2213 Inputs
Vdd 18v Vss ground H(in) L(in) 0 to 18v
Vcc 18v SD(shutdown)ground Vs to load COM
ground
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IR2213 Outputs
LO 0 to 18v HO 0 to 18v above H-bridge supply
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HARDWARE TESTING
IR2213 switching H-Bridge
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HARDWARE TESTING
IR2213 switching H-Bridge
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HARDWARE CONFIGURATION
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DISCUSSION OF HARDWAREPower CalculationsIRF640
120V motor

• 4 amp motor rated current 2.4 W
• Without heat sink
• Delta T 149 degrees C
• With heat sink
• Delta T 53 degrees C

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SOFTWARE DISCUSSION

• 14 Modules
• Timer 2 Mode 0
• External interrupts for port 4 output
• Liquid crystal display and keypad implementation
• Feedback input from actuator
• Digital control system

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COMPLETED WORK

• Searched for appropriate linear actuator and
  platform configuration
• Searched for appropriate motor and motor drive
• All hardware design and implementation
• Initial software design and implementation

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COMPLETED WORK

• Bi-directional actuator movement
• User interface for actuator control
• Display of current direction and duty cycle

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COMPLETED WORK

• Forward and reverse direction
• Various duty cycles
• Position feedback allows actuator to change
  direction without user input

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TASKS NOT COMPLETED

• Hardware implementation with 120 volt DC motor
• Build Test Platform with appropriate linear
  actuator
• Digital control software implementation
• - Ensures proper output at various loads

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QUESTIONS

• ?