Automation

1. Definition and Basic Examples

• What is an automated system? It is a system designed to operate and control processes with minimal or no continuous human intervention.

• Historical/Simple Example: A mechanical cuckoo clock. It operates on a simple timer mechanism—every hour, it automatically triggers a mechanical sign (the bird).

• Everyday Examples: Traffic lights (operating on timers or traffic sensors).

  • Information screens for public transport (automatically updating arrival times based on GPS).

  • Washing machines (running pre-set cleaning cycles).

2. Advanced Automation

Use these to show you understand complex applications:

• Autopilots in airplanes: They maintain altitude and heading without the pilot touching the controls.

• Automatic transmission in cars: The car's computer automatically shifts gears based on engine speed and load, removing the need for a manual clutch and gear stick.

3. The Core Concept: Closed-Loop Feedback Systems

This is the technical meat of your notes. To explain this clearly to the committee, describe it as a continuous cycle that constantly corrects itself.

• Step 1: Desired State & Command: You set a target (the desired state). The command generator calculates the error signal—the difference between where the system is now and where it needs to be.

• Step 2: Action (The Actuators): The system sends a command to an amplifier, which provides power to a motor. The motor uses a linkage (like a mechanical arm or hand) to perform the physical action.

• Step 3: Measurement (The Sensors): The system must check its own work. It uses instruments like a touch sensor or pressure sensor to measure the new environment.

• Step 4: The Feedback Loop: The sensor converts the physical measurement into an output voltage. A signal enhancer takes this data and sends a feedback signal straight back to the command generator.

Speaking Strategy for the Exam:

Start with the simple stuff—everyone understands a washing machine or a traffic light. Then, say: "However, the most important element of modern automation is the closed-loop feedback system." Walk them through the four steps above. If you want to make it super easy to understand, use a thermostat as an example: You set the desired state to 22°C, the sensor measures the room is only 19°C (the error signal), it turns on the heater (motor/power), and once it hits 22°C, the feedback signal tells it to shut off.