Lesson 8 control and robotics


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Lesson 8 control and robotics

  1. 1. Lesson 8: Control and robotics Technology: 3rd ESO
  2. 2. Index Control system: definition  Types of control systems  Parts of a control system  Robots: Definition  Parts of a robot  Types of robots 
  3. 3. Control system: Definition  A control system is a device capable of controlling enviromental conditions. They normally detect an enviromental signal, compare it with a fixed value set by the user and act over it. Regulation signal Input signal Control System Output signal Index
  4. 4. Types of control systems I: Open 1: open (ciclo abierto) The performance of the system over the enviromental condition has not feedback. We use a clock (time signal) to start or stop the performance  The system is quite simple  The control over the signal is quite poor. We are not sure we reach the required value Regulation signal Input signal Control System Output signal Index
  5. 5. Types of control system: Real time 2 real time (ciclo cerrado) There is a feedback. The output signal is detected by the control system an converted until the set value is reached  The system is more complex and expensive  High performance. There is accuraccy controlling the enviromental condition.  Regulation signal Input signal Control System Output signal Index
  6. 6. Parts of a control system (real time)    I. II. III. Sensor (detector): It registers the input signal and generates a prportional electric signal Regulator: It compares the input signal with the signal set by user. It generates a signal proportional to the difference between them Actuator: This component acts over the enviromental condition. Actuators can be Electric receivers: bulbs, motors, resistances (heating) Pneumatic (air): mechanic movements, weak and fast Hidraulic (oil): mechanic movements, strong and slower Index
  7. 7. Robots   A robot is a mechanical or virtual artificial agent, usually an electromochanical machine that is guided by a computer program or electronic circuitry. Due to its appearance or automatic movements robot can convey a sense of intelligence or thougth of its own Index
  8. 8. Why would we use robots?      We use robots to Repetitive tasks, such as welding, screwdriving… Dangerous tasks, such as desactivating bombs Activities which humans can`t do due to our size Activities in odd enviroments, unable for humans. Index
  9. 9. Are robots always better? Robots may be better for repetitive, accurate or dangerous tasks but  Robots haver not a thougth of their own  Robots can not improvise. If there is an unpredicted problem, they won’t be able to perform a task  Robot’s capacity to interact with people is limited. Index
  10. 10. Parts of a robot We can consider a robot as a control system where the actuator is a kinematic chain. Therefore we have  Detectors  Computer: controls the device  Kinematic chain: Index
  11. 11. Types of robots Robots can be classified according to many parameters:  Movement Coordinates.  Where they work Index
  12. 12. Types of robots: Moving coordinates   Cartesian robots are those which move according to x-y-z coordinates Polar or cylindrical robots can describe a circular movement in a plane as well as a linear one which is perpendicular to it Index
  13. 13. Androids    An android is a robot with a human resemblance. They try to imitate human movements and actions. They can consist of a human like part, such as an arm or either a whole human body. Androids are still under developement Index