NDLI: LATEX human motion planning based on recursive dynamics and optimal control techniques

Content Provider	IEEE Xplore Digital Library
Author	Huang, G. Metaxas, D. Lo, J.
Copyright Year	2000
Description	Author affiliation: Dept. of Comput. & Inf. Sci., Pennsylvania Univ., Philadelphia, PA, USA (Huang, G.)
Abstract	The 3D simulation of human activity based on physics, kinematics, and dynamics in terrestrial and space environments, is becoming increasingly important. Virtual humans may be used to design tasks in terrestrial environments and analyze their physical workload to maximize success and safety without expensive physical mockups. Previously (J. Lo and D. Metaxas, 1999), we presented an efficient optimal control and recursive dynamics based animation system for simulating and controlling the motion of articulated figures, and implemented the approach to several experiments where the simplified articulated models which has serial/closed-loop chain structures with only small degree-of-freedom (less than seven) each. The computation time is from a few minutes up to 4 hours based on the complexity of the model and how close the initial guess of the motion trajectory is to the optimal solution. The paper presents an improved method which can deal with more complicated kinematic chains (tree structures), as well as larger degree-of-freedom serial/closed-loop chain structures. Motion planning is done by first solving the inverse kinematic problem to generate possible trajectories, which gives us a better initial guess of the motion trajectory than the previous one, and then by solving the resulting nonlinear optimal control problem. For example, minimization of the torques during a simulation under certain constraints is often applied and has its origin in the biomechanics literature. Examples of activities shown are chinup and dipdown in different terrestrial environments as well as zero-gravity self orientation and ladder traversal.
Starting Page	19
Ending Page	28
File Size	311434
Page Count	10
File Format	PDF
ISBN	0769506437
DOI	10.1109/CGI.2000.852316
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-06-24
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Humans Kinematics Optimal control Trajectory Physics Safety Animation Computational modeling Motion control Tree data structures
Content Type	Text
Resource Type	Article

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