Nonsmooth Optimal Value and Policy Functions in Mechanical Systems Subject to Unilateral Constraints

State-of-the-art approaches to optimal control use smooth approximations of value and policy functions and gradient-based algorithms for improving approximator parameters. Unfortunately, we show that value and policy functions that arise in optimal control of mechanical systems subject to unilateral...

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Vydáno v:IEEE control systems letters Ročník 4; číslo 2; s. 506 - 511
Hlavní autoři: Banjanin, Bora S., Burden, Samuel A.
Médium: Journal Article
Jazyk:angličtina
Vydáno: IEEE 01.04.2020
Témata:
Cost function
Force
Heuristic algorithms
hybrid systems
Mechanical systems
Optimal control
robotics
Robots
Trajectory
ISSN:2475-1456, 2475-1456
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Shrnutí:State-of-the-art approaches to optimal control use smooth approximations of value and policy functions and gradient-based algorithms for improving approximator parameters. Unfortunately, we show that value and policy functions that arise in optimal control of mechanical systems subject to unilateral constraints - i.e., the contact-rich dynamics of robot locomotion and manipulation - are generally nonsmooth due to the underlying dynamics exhibiting discontinuous or piecewise-differentiable trajectory outcomes. Simple mechanical systems are used to illustrate this result and the implications for optimal control of contact-rich robot dynamics.
ISSN:2475-1456
2475-1456
DOI:10.1109/LCSYS.2019.2960442