Podcast
Questions and Answers
What is a main limitation of legged robots on flat surfaces?
What is a main limitation of legged robots on flat surfaces?
Legged robots are notoriously slow on flat surfaces.
What distinguishes a dynamically stable robot from a statically stable robot?
What distinguishes a dynamically stable robot from a statically stable robot?
A dynamically stable robot can remain upright while moving, whereas a statically stable robot does so without moving its legs.
Name one power actuation mechanism commonly used in robotics.
Name one power actuation mechanism commonly used in robotics.
Electric motors are the most popular actuation mechanism.
What are the three properties of good internal representations for robot perception?
What are the three properties of good internal representations for robot perception?
What is the role of the Dynamic Bayes network in robotics perception?
What is the role of the Dynamic Bayes network in robotics perception?
How do airborne robots typically achieve movement?
How do airborne robots typically achieve movement?
What is the primary distinction between active and passive sensors?
What is the primary distinction between active and passive sensors?
What is one challenge associated with robot perception?
What is one challenge associated with robot perception?
How do range sensors contribute to robotic functionality?
How do range sensors contribute to robotic functionality?
What advantage do proprioceptive sensors provide to a robot?
What advantage do proprioceptive sensors provide to a robot?
What is the primary function of communication in robotic systems?
What is the primary function of communication in robotic systems?
In what scenarios might Differential GPS be used effectively?
In what scenarios might Differential GPS be used effectively?
What role does computer vision play in imaging sensors?
What role does computer vision play in imaging sensors?
Why is it important for robots to integrate prior knowledge of tasks and environments?
Why is it important for robots to integrate prior knowledge of tasks and environments?
What type of imaging sensor captures depth information?
What type of imaging sensor captures depth information?
What challenges are associated with using multiple active sensors simultaneously?
What challenges are associated with using multiple active sensors simultaneously?
What role do force and torque sensors play in robotics?
What role do force and torque sensors play in robotics?
Define degrees of freedom (DOF) in the context of robotics.
Define degrees of freedom (DOF) in the context of robotics.
How many degrees of freedom does an Autonomous Underwater Vehicle (AUV) have, and what are they?
How many degrees of freedom does an Autonomous Underwater Vehicle (AUV) have, and what are they?
Describe the degrees of freedom of a human arm.
Describe the degrees of freedom of a human arm.
What distinguishes non-holonomic robots from holonomic robots?
What distinguishes non-holonomic robots from holonomic robots?
Give an example of a mobile robot and its locomotion mechanism.
Give an example of a mobile robot and its locomotion mechanism.
Explain the significance of the prismatic joint in a robotic arm.
Explain the significance of the prismatic joint in a robotic arm.
In the context of a car, describe its effective and controllable degrees of freedom.
In the context of a car, describe its effective and controllable degrees of freedom.
What are the primary categories of robots and what differentiates them?
What are the primary categories of robots and what differentiates them?
What role do sensors play in robotic systems?
What role do sensors play in robotic systems?
Identify two applications of manipulator robots and explain their significance.
Identify two applications of manipulator robots and explain their significance.
What challenges do mobile robots face in real-world environments?
What challenges do mobile robots face in real-world environments?
How do hybrid robots differ from manipulators and what is one of their key advantages?
How do hybrid robots differ from manipulators and what is one of their key advantages?
What types of environments pose challenges for robots, according to the content?
What types of environments pose challenges for robots, according to the content?
What is the importance of effectors in robotic systems and list some examples?
What is the importance of effectors in robotic systems and list some examples?
Give two examples of tasks that mobile robots can perform and discuss their implications.
Give two examples of tasks that mobile robots can perform and discuss their implications.
What is a motion model in the context of robotics?
What is a motion model in the context of robotics?
What is the purpose of localization in robotics?
What is the purpose of localization in robotics?
How does the tracking problem differ from global localization?
How does the tracking problem differ from global localization?
What role do landmarks play in localization systems?
What role do landmarks play in localization systems?
What is represented by the state vector Xt = (xt, yt, θt) in robotics?
What is represented by the state vector Xt = (xt, yt, θt) in robotics?
Define the kidnapping problem in localization.
Define the kidnapping problem in localization.
What assumptions do sensor models make about the environment?
What assumptions do sensor models make about the environment?
What inputs are involved in the motion model for localization?
What inputs are involved in the motion model for localization?
How does Gaussian noise affect range measurements in real-world scenarios?
How does Gaussian noise affect range measurements in real-world scenarios?
What are the main steps involved in the Monte Carlo Localization (MCL) process?
What are the main steps involved in the Monte Carlo Localization (MCL) process?
What is the role of the covariance matrix in Kalman Filters?
What is the role of the covariance matrix in Kalman Filters?
In Simultaneous Localization and Mapping (SLAM), what is the challenge faced by a robot in a dynamic environment?
In Simultaneous Localization and Mapping (SLAM), what is the challenge faced by a robot in a dynamic environment?
Explain how the Extended Kalman Filter (EKF) is used in SLAM.
Explain how the Extended Kalman Filter (EKF) is used in SLAM.
What is the primary assumption of the Kalman Filter regarding robot motion and measurement?
What is the primary assumption of the Kalman Filter regarding robot motion and measurement?
Why is resampling important in Monte Carlo Localization?
Why is resampling important in Monte Carlo Localization?
How does the motion model contribute to the particle filtering process in MCL?
How does the motion model contribute to the particle filtering process in MCL?
Flashcards
Active sensors
Active sensors
Sensors that send out energy into the environment and measure how this energy is reflected back. They provide more information but have higher power consumption and potential interference when multiple sensors are used.
Passive sensors
Passive sensors
Sensors that passively capture signals already present in the environment, such as light or sound waves.
Range Sensors
Range Sensors
Sensors that measure distances to objects, providing information about the robot's surroundings.
Imaging Sensors
Imaging Sensors
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Proprioceptive Sensors
Proprioceptive Sensors
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Sonar Sensors
Sonar Sensors
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Radar
Radar
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Laser Range Finders
Laser Range Finders
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Robots
Robots
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Effectors
Effectors
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Sensors
Sensors
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Manipulator Robots
Manipulator Robots
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Mobile Robots
Mobile Robots
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Hybrid Robots
Hybrid Robots
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Partially Observable Environments
Partially Observable Environments
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Stochastic Environments
Stochastic Environments
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Synchro drive
Synchro drive
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Legged Robots
Legged Robots
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Dynamically stable robot
Dynamically stable robot
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Airborne Robots
Airborne Robots
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Underwater Robots
Underwater Robots
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Robot Perception
Robot Perception
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Properties of Good Internal Representations
Properties of Good Internal Representations
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Dynamic Bayes Network
Dynamic Bayes Network
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Motion Model
Motion Model
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Sensor Model
Sensor Model
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Localization
Localization
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Global Localization Problem
Global Localization Problem
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Tracking Problem
Tracking Problem
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Kidnapping Problem
Kidnapping Problem
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Landmarks
Landmarks
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Robot's State
Robot's State
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Force and Torque Sensors
Force and Torque Sensors
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Degrees of Freedom (DOF)
Degrees of Freedom (DOF)
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Degrees of Freedom in a Robot
Degrees of Freedom in a Robot
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Non-Holonomic Robot
Non-Holonomic Robot
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Holonomic Robot
Holonomic Robot
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Differential Drive Robot
Differential Drive Robot
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Mobile Robot: 2 Controllable DOFs
Mobile Robot: 2 Controllable DOFs
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Range Scanner
Range Scanner
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Monte Carlo Localization
Monte Carlo Localization
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Kalman Filter
Kalman Filter
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Simultaneous Localization and Mapping (SLAM)
Simultaneous Localization and Mapping (SLAM)
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Extended Kalman Filter (EKF) for SLAM
Extended Kalman Filter (EKF) for SLAM
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Sensor Update
Sensor Update
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Resampling
Resampling
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Study Notes
Module 5: AI in Robotics
- Robotics are physical agents manipulating the physical world
- Robots are equipped with effectors (legs, wheels, joints, grippers) to apply physical forces to the environment
- Robots use sensors (cameras, ultrasound, gyroscopes, accelerometers) to perceive their environment and their own motion
- Robots are categorized into manipulators, mobile robots, and hybrid robots
Manipulator Robots
- Also known as robot arms
- Anchored to a workplace (e.g., factory lines, space station)
- Feature controllable joint chains for precise effector placement
- Common in industries, hospitals, and art creation
- Applications include assisting surgeons, car manufacturing, and artwork creation
Mobile Robots
- Move using wheels, legs, or similar mechanisms
- Applications include delivering food in hospitals, moving containers, driverless cars (e.g., NAVLAB), unmanned aerial vehicles (UAVs), autonomous underwater vehicles (AUVs), and planetary rovers (e.g., Sojourner)
Hybrid Robots
- Combine mobility with manipulators (e.g., humanoid robots mimicking human torsos)
- Can apply effectors further afield than anchored manipulators, but their task is harder, and rigidity is limited
- Examples include humanoid robots, prosthetics, intelligent environments (smart homes with sensors), and multibody systems (swarms of small robots)
- Advantages include a wider reach
- Challenges include a lack of stability compared to anchored systems
Challenges in Real-World Robotics
- Environment: Partially observable, stochastic, dynamic, and continuous. Robots may not see everything (e.g., around corners), and motion errors may occur (e.g., friction, gear slips). Real-world environments operate in real time. Learning is slower and riskier than in simulations.
- Safety and Efficiency: Robots must integrate prior knowledge of tasks, environments, and their limitations to learn efficiently and operate safely without repeated errors.
Types of Sensors
- Passive Sensors: Capture signals generated by other sources in the environment (e.g., cameras).
- Active Sensors: Send energy into the environment and rely on reflected energy to perceive their environment (e.g., lasers, radar). Multiple active sensors can increase power consumption and create interference.
- Sensor types are further categorized into whether they record distances (sonar), entire images, or robot properties.
Sensor Classifications
- Range Sensors (Distance Measurement): Including Sonar, Radar, Laser Range Finders.
- Close-Range Sensors: Tactile sensors (whiskers, bump panels, touch-sensitive skins)
- GPS: Measures distances to satellites, enabling accurate location outdoors; often less effective indoors or underwater.
- Imaging Sensors: Cameras used to create images of the environment, including stereo vision for depth perception
- Proprioceptive Sensors: Provide information about the robot's internal state; including shaft decoders for measuring rotational motion, inertial sensors like gyroscopes for orientation tracking, and force and torque sensors to measure forces and torques.
Effectors
- Effectors are the means by which robots move and change the shape of their bodies.
- Designed with the degree of freedom (DOF). Degrees of freedom refer to the independent movements possible within a robot's joints or body.
- AUV example, six DOF, three translational and three rotational (yaw, roll, pitch)
Motion Model for Robots
- If a robot moves slowly in a plane, a precise map can be used.
- Pose is defined by x, y coordinates and heading.
- State Vector (Xt) = (xt, yt, 0t)
Motion Model for Localization
- Inputs include translational velocity (vt) and rotational velocity (wt).
- Deterministic Models predict future position changes given inputs (vt, wt, and At).
Sensor Model
- Two types of Sensor Models:
- Stable, recognizable features in the environment, called Landmarks.
- Using geometry (range, bearing,) to calculate distance to landmark.
Localization Techniques
- Monte Carlo Localization (MCL): Uses particle filtering to estimate a robot's location
- Particles representing possible robot states, updated using motion and sensor models
- Steps
- Initialization: Particles uniformly distributed
- Sensor Update: Measurements assigned weights to particles
- Resampling: Particles are resampled, keeping those with high weights
- Kalman Filters: Assumes the robot's belief is a Gaussian distribution with mean (μ) and covariance (Σ); Suitable for linear motion and measurement systems
Simultaneous Localization and Mapping (SLAM)
- SLAM is a problem where a robot must localize itself and create a map of an unknown environment simultaneously.
- Assumes a fixed environment for simplicity
- Extended Kalman Filter (EKF) for SLAM
- Posterior distribution as a Gaussian
- Mean vector (ut) contains robot pose and landmark locations
- Covariance matrix (∑t) tracks uncertainties and correlations
Planning to move
- Point-to-Point Motion: Delivering the robot or its end-effector to a designated target location.
- Compliant Motion: Robot movement while physically interacting with an obstacle (e.g., screwing a light bulb)
- Configuration Space: A better space for path planning than original 3D space, defined by location, orientation, joint angles.
- Path Planning: Finding a path from one configuration to another using continuous spaces.
- Major families include cell decomposition and skeletonization.
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