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Robotics and Automation Control
Er.Rashmi Assistant Professor GNA University
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ROBOTICS It is ability to perform on its own, going to the extent of unmanning several operations. To relieve man from tedious and mindless, repetitive and hazardous jobs. Robotics in Inter dispilnary field of study
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Important areas of robotics
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Prothesis
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Exoskeltons
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cs
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Locomotive device Locomotive Robot series
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Laws of Robotics
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Functions of ROBOT SENSING Decision Making Performing
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Difference between ROBOT and Automated Machine
Automation: the machine produces a job following a set of operational jobs at different times. Different sequence can be addressed by programming.
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Automation
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Robot- is programmable, sensing and perception, function automatically
Carry out different tasks
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Study about Numerically controlled technology
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Advantages and disadvantage
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Types of Robots General Purpose Special purpose welding,spray painting
Telerobot Mobile robot Autonomous robot Androids
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Basic Components of Robots
BASE MANIPULATOR ARM END EFFECTORS ACTUATORS AND TRANSMISSION CONTROLLER SENSORS
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MANIPULATOR ARM Revolute pair (R)-1 DOF Prismatic pair (P)-1 DOF
Cylindrical Pair (C)- 2DOF
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Universal hook’s Joint
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End effector Gripping methods Mechanical clamping Magnetic gripping
Vacuum gripping
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Actuators and Transmission
Pneumatic drives Hydraulic drives Electrical drives
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Pneumatic drives
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Hydraulic drives
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Piezoelectric Actuators
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Electrical Drives
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Transmission
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Controller
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Sensors Tactile sensors- (contact sensor) must be brought in contact with the object to obtain signals to measure the necessary qualities. Force sensor, Torque sensors, Touch sensors, Position sensor
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Torque sensors Touch sensors Position sensors
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Position sensors
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Non tactile sensors Contactless sensors Proximity sensors
Electro-optical sensors Range imaging sensors
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Basic Motions 6 motions Vertical motion Radial motion
Rotational motion Pitch motion Roll motion yaw
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DOF Horizontal travel Rotary movement Radial arm movement
Vertical arm movement Rotary wrist movement Wrist bend Wrist sweep
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Basic components of Microprocessor based robotic system
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Six axes
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Robot Classification Standard classification Broad classification
General classification
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Standard Classification
Mechanical configuration based It considers various joints, links, physical structure of robot and relation to each other. Cartesian coordinate configuration Cylindrical configuration Spherical configuration Jointed-arm configuration (Revolute)
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Control method based it considers the type of techniques implement to control the robot. i.e; 1.Non Servo controlled , 2. Servo controlled
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Cartesian coordinate config.
Cartesian or rectilinear robot also called as gantry robot, has three mutually perpendicular axes which defines a rectangular work volume. Links of manipulator are constrained to move in linear motion. (Prismatic) Cartesian coordinates may be of two types. Cantilevered Cartesian Gantry-style Cartesian
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Cylindrical Config. Arm move up and down Arm move radially w.r.t
The column. Θ=360 not permitted Due to h,e,p connections or lines.
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Spherical (polar)configuration
It has telescopic arm, which pivots about a horizontal axis and also rotates about a vertical axis. Work envelope of such robot is a portion of sphere due to mechanical and actuators connections.
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Range of spherical coordinate robot
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Jointed-arm configuration (Revolute)
Most resembles a human arm. Consists series of links connected by rotary joints which are referred as Shoulder, arm, wrist joints. Pure spherical, parallelogram sph, cylinderical
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SCARA
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Control Classification
Non servo controlled (limited sequence robots, end point robots, pick and place or bang bang robots) Controlled by setting mechanical stops or limit switches to establish end points to travel of each joints Servo controlled robots Subdivided- continues path (CP) point to point (PTP) Info abt position and velocity monitored and fed back to control system. Control system control the movements.
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Mechanical Inaccuracies
Results from the various errors that can occur in a robot construction. These includes gear, backlash, stretching of pulley cords, leakage of fluids or material and structural imperfections. Such errors degrade the overall accuracy of the robot. And are magnified when the arm is fully extended.
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Broad Classification Programmable/Reprogrammable general purpose robots Tele-operated, Man controlled robots or man-in-the-loop manipulator Intelligent Robot
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General Classification
Special purpose robots General Purpose robot They can be Non-servo controlled Servo controlled Sensory robots
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