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The kinematic structure of a 3 DOF snow plowing robot is shown below at its home configuration. Coordinate frames are attached to the individual
The kinematic structure of a 3 DOF snow plowing robot is shown below at its home configuration. Coordinate frames are attached to the individual links, as shown in the figure below. Joint 1 is a revolute joint about the zo axis. Joints 2 and 3 are also revolute joints about the horizontal axes at points B and D, respectively. Link 1 is an L-shaped rigid body connecting Joints 1 and 2. Coordinate frame A- xyz is attached to point A. Link 2 is also an L-shaped rigid body with a coordinate frame attached to point C. A large shovel is attached to the endpoint E. All joint angles are zero at the home configuration, and are measured in a right hand sense. Three unit vectors pointing in the directions of x,, y, and z, axes of the individual coordinate frames are indicated as n, t,b,, i = 0 ~ 3 . The link dimensions are OA = 10, AB = l, BC = l2, CD = 13,DE = 14. Answer the following questions. Z1 2 b Z2 b3 A t B Link 2 C t y Z3 Joint 2 x X E Link 1 02 Link 3 y3 0 Joint 3 03 X3 n3 Joint 1 Zo bo Link 0 Yo Figure 4 Schematics of a 3DOF snow plowing robot at home configuration
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