Articulated Robots! Robert Stengel! Robotics and Intelligent Systems! MAE 345, Princeton University, 2017
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1 Articulated Robots! Robert Stengel! Robotics and Intelligent Systems! MAE 345, Princeton University, 2017 Robot configurations Joints and links Joint-link-joint transformations! Denavit-Hartenberg representation Copyright 2017 by Robert Stengel. All rights reserved. For educational use only. 1 Assembly Robot Configurations Cartesian Cylindrical Polar Articulated Revolute McKerrow,
2 Assembly Robot Workspaces Cylindrical Articulated Revolute McKerrow, 1991 Tesla Model S Assembly watch?v=8_lfxpi5obm 3 Serial Robotic Manipulators Proximal link: closer to the base Distal link: farther from the base Serial chain of robotic links and joints! Large workspace! Low stiffness! Cumulative errors from link to link! Proximal links carry the weight and load of distal links! Actuation of proximal joints affects distal links! Limited load-carrying capability at end effecter 4
3 Humanoid Robots 5 NASA/GM Robonaut Robonaut v=g3u48t4vx7k 6
4 Disney Audio-Animatronics, Baxter, Sawyer, and the PR2 Baxter v=qhamsalhiv8 PR2 watch?v=hmx1xw2e4gg Sawyer 8
5 Parallel Robotic Mechanisms End plate is directly actuated by multiple links and joints kinematic chains! Restricted workspace! Common link-joint configuration! Light construction! Stiffness! High load-carrying capacity Stewart Platform v=qdko9pywgau Pick-and-Place Robot v=i4obexi2kiq 9 Gearing and Leverage Force multiplication Displacement ratios 10
6 Machine tools! Grinding, sanding! Inserting screws! Drilling! Hammering Paint sprayer Gripper, clamp Multi-digit hand End Effecters DARPA Prosthetic Hand v=qjg9igtnjiofeature=related 11 Links and Joints! 12
7 Human Joints Gray s Anatomy, 1858 Wrist/Hand Shoulder Elbow Hand/Fingers 13 Skeleton and Muscle- Induced Motion 14
8 Revolute Robotic Joints Rotation about a single axis Parallel to Link Perpendicular to Link 15 Prismatic Robotic Joints Sliding along a single axis 16
9 Universal Spherical or ball Other Robotic Joints Flexible Constant-Velocity Roller Screw Cylindrical sliding and turning composite Planar sliding and turning composite 17 Construction Cranes Pivoted Tower Cranes Balanced Tower Cranes Port Cranes 18
10 Four-Bar Linkage Closed-loop structure Rotational joints Planar motion Proportions of link lengths determine pattern of motion Examples! Double wishbone suspension! Pantograph! Scissor lift! Gripper 19 Characteristic Transformation of a Link Link: solid structure between two joints Each link type has a characteristic transformation matrix relating the proximal joint to the distal joint Link n has! Proximal end: Joint n, coordinate frame n 1! Distal end: Joint n + 1, coordinate frame n Distal Proximal McKerrow,
11 Links Between Revolute Joints Link: solid structure between two joints! Proximal end: closer to the base! Distal end: farther from the base Type 1 Link Two parallel revolute joints 4 Link Parameters! Length of the link between rotational axes, l, along the common normal! Twist angle between axes,!! Angle between 2 links, " revolute! Offset between links, d prismatic Joint Variable: single link parameter that is free to vary Type 2 Link Two non-parallel revolute joints McKerrow, Links Involving Prismatic Joints Type 5 Link Intersecting prismatic joints Type 6 Link Intersecting revolute and prismatic joints Link n extends along z n-1 axis Link n extends along z n-1 axis l n = 0, along x n-1 d n = length, along z n-1 variable! n = 0, about z n-1 " n = fixed orientation of n + 1 prismatic axis about x n-1 l n = 0, along x n-1 d n = length, along z n-1 fixed! n = variable joint angle n about z n-1 " n = fixed orientation of n + 1 prismatic axis about x n-1 22 McKerrow, 1991
12 Links Between Revolute Joints - 2 Type 3 Link Two revolute joints with intersecting rotational axes e.g., shoulder Type 4 Link Two perpendicular revolute joints with common origin e.g., elbow-wrist McKerrow, 1991 Link n extends along z n-1 axis l n = 0, along x n-1 d n = length, along z n-1 fixed! n = variable joint angle n about z n-1 " n = fixed orientation of n + 1 rotational axis about x n-1 Link n extends along -z n axis l n = 0, along x n-1 d n = 0, along z n-1! n = variable joint angle n about z n-1 " n = fixed orientation of n + 1 rotational axis about x n-123 Links Involving Prismatic Joints - 2 Type 7 Link Parallel prismatic and revolute joints Type 8 Link Intersecting prismatic and revolute joints Link n extends along x n-1 axis l n = length along x n-1 d n = 0, along z n-1! n = variable joint angle n about z n-1 " n = 0, orientation of n + 1 prismatic axis about x n-1 McKerrow, 1991 Link n extends along z n-1 axis l n = 0, along x n-1 d n = length, along z n-1 variable! n = 0, about z n-1 " n = fixed orientation of n + 1 rotational axis about x n-1 24
13 Two-Link/Three-Joint Manipulator Parallel Rotation Axes Manipulator in zero position Workspace McKerrow, 1991 Assignment of coordinate frames Parameters and Variables for 2-link manipulator Link lengths fixed Joint angles variable 25 Four-Joint SCARA * Manipulator Arm with Three Revolute Link Variables Joint Angles Operation sbtccyjxo McKerrow, 1991 *Selective Compliant Articulated Robot Arm 26
14 Joint Variables Must Be Actuated and Observed for Control Frames of Reference for Actuation and Control!World coordinates!actuator coordinates!joint coordinates!tool coordinates Rotary Actuators Sensors May Observe Joints Directly, Indirectly, or Not At All Linear Actuator 27 Simulink/SimMechanics Representation of Four-Bar Linkage 28
15 Recall: Homogeneous Transformation s new =! Rotation " Matrix new old! Location of Old " Origin new *,,, s old = A new old s old,, +, Transform from one joint to the next 29 Rotation Matrix can be Derived from Euler Angles or Quaternions! A = " new H old r oldnew ! = " h 11 h 12 h 13 x o h 21 h 22 h 23 y o h 31 h 32 h 33 z o Canadarm2, ISS 30
16 Series of Homogeneous Transformations Two serial transformations can be combined in a single transformation s 2 = A 1 2 A 0 1 s 0 = A 0 2 s 0 Four transformations for SCARA robot s 4 = A 3 4 A 2 3 A 1 2 A 0 1 s 0 = A 0 4 s 0 31 Transformation for a Single Robotic Joint-Link Each joint-link requires four sequential transformations:! Rotation about!! Translation along d! Translation along l! Rotation about " s n+1 = A 3 n+1 A 2 3 A 1 2 A n 1 s n = A n n+1 s n = A! A d A l A " s n = A n n+1 s n Type 2 Link... axes for each transformation along or around must be specified 4 th 3 rd 2 nd 1 st s n+1 = A z n!1," n A z n!1,d n A x n!1,l n A x n!1, n s n = A n+1 n s n 32
17 Denavit-Hartenberg Representation of Joint-Link-Joint Transformation! 33 Denavit-Hartenberg Representation of Joint-Link-Joint Transformation Like Euler angle rotation, transformational effects of the 4 link parameters are defined in a specific application sequence right to left: {", d, l,! } 4 link parameters! Angle between 2 links, " revolute! Distance offset between links, d prismatic! Length of the link between rotational axes, l, along the common normal prismatic! Twist angle between axes,! revolute A n = A z n!1," n A z n!1,d n A x n!1,l n A x n!1, n = Rotz n!1," n Transz n!1,d n Transx n!1,l n Rotx n!1, n! n T n+1 in some references e.g., McKerrow, 1991 Denavit-Hartenberg Demo 34
18 Four Transformations from One Joint to the Next Single Link Rotation of " n about the z n-1 axis cos" n!sin" n 0 0 sin" Rotz n!1," n = n cos" n Translation of l n along the x n-1 axis " l n Transx n!1,l n = Translation of d n along the z n-1 axis " Transz n!1,d n = d n Rotation of! n about the x n-1 axis cos" Rotx n!1," n = n!sin" n 0 0 sin" n cos" n Denavit-Hartenberg Representation of Joint- Link-Joint Transformation Then Then Then First cos" n!sin" n 0 0 A n!1 sin" n = n cos" n d n l n cos n!sin n 0 0 sin n cos n A n n!1 = cos" n!sin" n cos n sin" n sin n l n cos" n sin" n cos" n cos n! cos" n sin n l n sin" n 0 sin n cos n d n
19 Example: Joint-Link-Joint Transformation, Type 1 Link Joint Variable = " n! = variable d = 0 m l = 0.25 m " = 90 deg!! 30 deg d = 0 m l = 0.25 m " = 90 deg A n n!1 = cos" n!sin" n cos n sin" n sin n l n cos" n sin" n cos" n cos n! cos" n sin n l n sin" n 0 sin n cos n d n A n n!1 = A n n!1 = cos" n 0 sin" n 0.25cos" n sin" n 0! cos" n 0.25sin" n " ! Forward and Inverse Transformations Forward transformation: proximal to distal frame Expression of proximal frame in distal frame s 1 = A 0 1 s 0 ; s 2 = A 1 2 s 1 = A 1 2 A 0 1 s 0 = A 0 2 s 0 Reverse transformation: distal to proximal frame = inverse of forward transformation s 0 = A 0 2!1 s 2 = A 2 0 s 2 = A 1 0 A 2 1 s 2 38
20 Homogeneous Transformation Matrix is not Orthonormal A = A 0!1 2 " A 0 T but a useful identity makes inversion simple 39 Matrix Inverse Identity Given: a square matrix, A, and its inverse, B " A = A 1 m!m A 3 n!m A 2 m!n A 4 n!n " B ; B! A 1 1 B 2 = B 3 B 4 Then AB = AA!1 = I m+n " I m 0 = 0 I n A 1 B 2 + A 2 B 4 A 3 B 2 + A 4 B 4 " = A 1 B 1 + A 2 B 3 A 3 B 1 + A 4 B 3 Equating like parts, and solving for B i! " B 1 B 2 B 3 B 4 1 A 1 1 A 2 A 4 A 3 A 1 1 A A 4 A 3 A 1 1 A 2 1! = A 1 A 2 A 1 4 A 3 A 1 4 A 3 A 1 A 2 A 1 4 A " 3 40
21 Apply to Homogeneous Transformation Forward transformation to distal frame! A! " A 1 A 2 A 3 A 4! = " distal H proximal r oproximal Inverse transformation to proximal frame! " distal H proximal r o ! = " B 1 B 2 B 3 B 4! = " proximal H distal H proximal distal r odistal Apply to Homogeneous Transformation Forward transformation! A! " A 1 A 2 A 3 A 4! h 11 h 12 h 13 x o == h 21 h 22 h 23 y o h 31 h 32 h 33 z o " Inverse transformation! " h 11 h 12 h 13 x o h 21 h 22 h 23 y o h 31 h 32 h 33 z o ! = " h 11 h 21 h 31 h 11 x o + h 21 y o + h 31 z o h 12 h 22 h 32 h 12 x o + h 22 y o + h 32 z o h 13 h 23 h 33 h 13 x o + h 23 y o + h 33 z o
22 Next Time:! Transformations, Trajectories, and Path Planning! 43 Supplemental Material! 44
23 Multi-Bar-Linkage Gripper v=ydd6vbx9oqufeature=related 45
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