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画出一条曲线的位置、速度和加速度图形, 该条曲线由例 7.2 给出的两段加速度连续的样条曲线组成。对于某个关节, $\theta_0=5.0^{\circ}, \theta_0=15.0^{\circ}, \theta_s=-10.0^{\circ}$, 假定每段持续 2.0 秒, 画出这些图形.

    画出一条曲线的位置、速度和加速度图形, 该条曲线由例 7.2 给出的两段加速度连续的样条曲线组成。对于某个关节, $\theta_0=5.0^{\circ}, \theta_0=15.0^{\circ}, \theta_s=-10.0^{\circ}$, 假定每段持续 2.0 秒, 画出这些图形.
机器人学导论 introduction to robotics: mechanics and control
机器人学导论 introduction to robotics: mechanics and control
约翰 J.克雷格 4th Edition
Chapter 7, Problem 8 ↓

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Given that each segment lasts for 2.0 seconds, we can use the formula for angular velocity: $\omega = \frac{\theta_s - \theta_0}{t}$. For the first segment: $\omega_1 = \frac{15.0^{\circ} - 5.0^{\circ}}{2.0 s} = 5.0^{\circ}/s$. For the second segment: $\omega_2 =  Show more…

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画出一条曲线的位置、速度和加速度图形, 该条曲线由例 7.2 给出的两段加速度连续的样条曲线组成。对于某个关节, $\theta_0=5.0^{\circ}, \theta_0=15.0^{\circ}, \theta_s=-10.0^{\circ}$, 假定每段持续 2.0 秒, 画出这些图形.
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Key Concepts

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Trajectory Planning
This concept involves designing a motion path for a system such that it moves from a starting configuration to a target configuration while satisfying constraints on kinematic quantities like velocity, acceleration, and sometimes jerk. Effective trajectory planning ensures smooth, efficient, and safe motion by carefully considering the transition and continuity between different segments of the motion.
Spline Interpolation
Spline interpolation is a mathematical technique used to create a smooth curve through a set of points. In the context of trajectory planning, splines are formulated to ensure the continuity not only of the position but also of higher derivatives like velocity and acceleration. This results in a motion profile where acceleration is continuous, minimizing abrupt changes that could cause mechanical stress or discomfort.
Kinematics
Kinematics is the branch of mechanics that deals with the motion of objects without considering the forces that cause these motions. It focuses on the relationships between position, velocity, and acceleration as functions of time. In trajectory planning, deriving and analyzing these kinematic quantities is essential for understanding how a joint or a mechanical part behaves over time during its motion.
Graphical Representation of Motion Profiles
Graphically representing a motion plan involves plotting curves for position, velocity, and acceleration over time. These plots help in visualizing the smoothness and continuity of the motion, verifying that the designed trajectory meets the necessary constraints, and allowing for debugging or further refinement of the motion profile.

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