Questions: Denavit-Hartenberg Notation and Transformation Matrices
1 questions to test your understanding
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Question 1 Multiple Choice
For a revolute joint in a robot arm, the Denavit-Hartenberg parameters are: link length a = 0.3m, twist α = 90°, link offset d = 0.2m, joint angle θ (variable). Which of these is determined by the robot's physical construction, and which changes as the joint rotates?
AAll four parameters are constant; θ varies as a separate quantity during motion
Ba, α, and d are constant (physical), and θ is the joint variable that changes
COnly θ is constant; a, α, d all vary as the joint rotates to maintain kinematic consistency
Dθ is constant for a fixed joint configuration, and a, α, d are control inputs that change
The power of DH is standardization and reusability. Any robot can be described by its DH parameters. Any forward kinematics code that accepts a DH parameter table works for any arm. This has made DH the industry standard for robot kinematics.