Results 41 to 50 of about 10,166,528 (298)

Unsupervised Machine Learning Identifies Shared Biomechanical and Clinical Variation in Individuals with Knee Osteoarthritis and High Body Mass Index

Arthritis Care &Research, EarlyView.
Objective High body mass index (BMI ≥ 27 kg/m2) and aberrant gait biomechanics are primary risk factors for knee osteoarthritis (KOA), yet the specific loading patterns linked to clinical disease features remain unclear. Unsupervised machine learning (ML) was used to identify vertical ground reaction force (vGRF) waveform modes of variation and ...
Ashley N. Buck, J. Elyse Borgert, Hyeon Lee, Liubov Arbeeva, Yvonne M. Golightly, Richard F. Loeser, Leigh F. Callahan, Stephen P. Messier, Brian Pietrosimone, Amanda E. Nelson, James S. Marron   +10 more
wiley   +1 more source

The Application of ZFD Formula to Kinematic Control of Redundant Robot Manipulators With Guaranteed Motion Precision

IEEE Access, 2018
Zhang et al. recently design a special difference formula called the Zhang finite-difference (ZFD) formula. This paper applies the ZFD formula for the kinematic control of redundant robot manipulators, due to its good performance in approximating first ...
Zexin Li, Feng Xu, Qingshan Feng, Jianhuang Cai, Dongsheng Guo   +4 more
doaj   +1 more source

Microstructural Evolution and Vacancy Defect Formation in Mn–Mo–Ni RPV Steel Under Low Cycle Fatigue: Insights From EBSD and PALS

Advanced Engineering Materials, EarlyView.
Low‐cycle fatigue damage in Mn–Mo–Ni reactor pressure vessel steel is examined using a combined electron backscatter diffraction and positron annihilation lifetime spectroscopy approach. The study correlates texture evolution, dislocation substructure development, and vacancy‐type defect formation across uniform, necked, and fracture regions, providing
Apu Sarkar, Dhanadeep Dutta, G. Bharat Reddy   +2 more
wiley   +1 more source

Integration of a Digital Twin Framework for Trajectory Control of a 2RRR Planar Parallel Manipulator Using ROS/Gazebo and MATLAB

Future Internet
Digital twin (DT) technology is transforming industrial automation by enabling the real-time simulation, predictive control, and optimization of complex systems. This study presents a DT-based kinematic control method designed for trajectory planning and
Carlos Andrés Mesa-Montoya, Néstor Iván Marín Peláez, Kevin David Ortega-Quiñones, German Andrés Holguín-Londoño, Libardo Vicente Vanegas-Useche, Gian Carlo Daraviña-Peña, Edwan Anderson Ariza-Echeverri, Diego Vergara   +7 more
doaj   +1 more source

Viability and Feasibility of Constrained Kinematic Control of Manipulators [PDF]

Robotics, 2018
Recent advances in planning and control of robot manipulators make an increasing use of optimization-based techniques, such as model predictive control. In this framework, ensuring the feasibility of the online optimal control problem is a key issue. In the case of manipulators with bounded joint positions, velocities, and accelerations, feasibility ...
Faroni, Marco, Beschi, Manuel, Pedrocchi, Nicola, Visioli, Antonio   +3 more
openaire   +3 more sources

Modelling and control of an under-actuated closed kinematic chain

, 1998
The aim of the paper is to control a closed kinematic chain, under the assumption that the chain is under-actuated and that only partial measurements of the state variables are available.
Tornambè, A, Zaccarian, L, Menini, L., Zaccarian, L., Tornambè, A., Menini, L, A. Tornambè, L. Zaccarian, L. Menini   +8 more
core   +1 more source

Controlling Grain Growth in Powder Bed Fusion of Yttria‐Stabilized Zirconia Using Femtosecond Lasers: Challenges and Methodological Insights

Advanced Engineering Materials, EarlyView.
Binder‐free laser powder bed fusion of 8YSZ with a femtosecond laser is used to map process windows linking scan strategy, heat accumulation, and grain growth. Time‐resolved thermography and simulations reveal thermal regimes that enable continuous, vitrified, and fine‐grained 8YSZ surface layers without absorptive additives and demonstrate ...
Markus Kühn, Sarah Kaden, Andrea Barz, Daniel Störzner, Jens Bliedtner, Andrés Fabián Lasagni   +5 more
wiley   +1 more source

A Systematic Benchmark of Reinforcement Learning Formulations for Tendon-Driven Continuum Robot Control

IEEE Access
Continuum robots are well suited to confined and contact-rich environments, but their control remains challenging because modeling fidelity, computational cost, and real-time feasibility are often in tension.
Darius Rusinak, Michal Kelemen, Ivan Virgala   +2 more
doaj   +1 more source

Kinematic analysis of complex gear mechanisms [PDF]

, 2010
This paper presents a general kinematic analysis method for complex gear mechanisms. This approach involves the null-space of the adjacency matrix associated with the graph of the mechanism weighted by complex coecients.
Penaud, Julie, Alazard, Daniel
core  

Task-oriented kinematic control of two cooperative 6-DOF manipulators

, 1993
The kinematic control problem for a system of two cooperative 6-dof manipulators is addressed in this paper. First, a kinematic model of the system is obtained which allows a clear description of the task in terms of absolute and relative variables. Then,
Stefano Chiaverini, SICILIANO, BRUNO, CHIACCHIO, Pasquale, Bruno Siciliano, S. Chiaverini, P. Chiacchio, Pasquale Chiacchio   +6 more
core   +1 more source