Journal ArticleDOI
Prediction and analysis of human motion dynamics performing various tasks
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TLDR
In this article, an optimisation-based algorithm for simulating the dynamic motion of a digital human is presented, where human performance measures such as the total energy consumption governs human motion; thus, the process of human motion simulation can be formulated as an optimization problem that minimises human performance measure given at different constraints and hand loads.Abstract:
Several digital human softwares have shown the capabilities of simulating simple reach motions. However, predicting the dynamic effects on human motion due to different task loads is still immature. This paper presents an optimisation-based algorithm for simulating the dynamic motion of a digital human. The hypothesis is that human performance measures such as the total energy consumption governs human motion; thus the process of human motion simulation can be formulated as an optimisation problem that minimises human performance measures given at different constraints and hand loads, corresponding to a number of tasks. General equations of motion using Lagrangian dynamics method are derived for the digital human, and human metabolic energy is formulated in terms of joint space. Joint actuator torques and metabolic energy expenditure during motion are formulated and calculated within the algorithm, and it is applied to Santos™, a kinematically realistic digital human, developed at the University of Iowa. Results show that different external loads and tasks lead to different human motions and actuator torque distributions.read more
Citations
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Towards a new generation of virtual humans
Karim Abdel-Malek,Jingzhou Yang,Timothy Marler,Steven Beck,Anith Mathai,Xianlian Zhou,Amos Patrick,Jasbir S. Arora +7 more
TL;DR: An optimisation-based approach to posture and motion prediction that allows the avatar to operate with autonomy rather than depending on stored animations and data or being restricted by inverse kinematics is presented.
Book
Modeling and Simulation of Skeletal Muscle for Computer Graphics: A Survey
TL;DR: This work surveys various approaches to model and simulate muscles both morphologically and functionally, including geometrically-based, physically- based, and data-driven approaches.
Journal ArticleDOI
Optimization-based dynamic prediction of kinematic and kinetic patterns for a human vertical jump from a squatting position
TL;DR: Qualitative and quantitative comparisons between predicted results and experimental observations indicate that the approach is capable of predicting the jump height enhancement in squat vertical jumping with arm swing and reproducing the coordinated motion in terms of kinetics and kinematics.
Journal ArticleDOI
Hybrid predictive dynamics: a new approach to simulate human motion
TL;DR: The proposed method takes advantage of both prediction and tracking capabilities simultaneously, so that HPD has more applications in human motion prediction, especially towards clinical applications.
Journal ArticleDOI
Passive and dynamic gait measures for biped mechanism: formulation and simulation analysis
TL;DR: The initial formulations of Passive Gait Measure (PGM) and Dynamic GaitMeasure (DGM) that quantify passivity and dynamicity, respectively, of a given biped walking motion are introduced and the proposed formulations will be demonstrated for proof-of-concepts using gait simulation and analysis.
References
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SNOPT: An SQP Algorithm for Large-Scale Constrained Optimization
TL;DR: An SQP algorithm that uses a smooth augmented Lagrangian merit function and makes explicit provision for infeasibility in the original problem and the QP subproblems is discussed.
Journal ArticleDOI
SNOPT: An SQP Algorithm for Large-Scale Constrained Optimization
TL;DR: An SQP algorithm that uses a smooth augmented Lagrangian merit function and makes explicit provision for infeasibility in the original problem and the QP subproblems is discussed and a reduced-Hessian semidefinite QP solver (SQOPT) is discussed.