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2 years ago in Robotics By Abhay R

Is there a contradiction between minimizing joint torque and minimizing cycle time in trajectory planning?

Do the objectives of torque minimization and cycle time minimization conflict in robotic trajectory optimization?

All Answers (1 Answers In All)

By Veena Answered 1 year ago

Yes, there is often a trade-off. Minimizing torque (or energy) typically requires smoother, slower motions to avoid high accelerations. Minimizing time demands rapid, often aggressive movements that inherently require higher torques. This is a classic multi-objective optimization problem. The optimal solution is usually a Pareto-optimal trajectory that balances both objectives based on assigned weights. References clarifying this include "Trajectory Planning for Automatic Machines and Robots" (Gasparetto & Zanotto) and key papers by J.E. Bobrow on time-optimal control. The contradiction is most pronounced in underactuated systems where control authority is limited.

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