Results 41 to 50 of about 27,598 (296)

Deterministic Design for a Compliant Parallel Universal Joint With Constant Rotational Stiffness

, 2018
Compliant universal joints have been widely employed in high-precision fields due to plenty of good performance. However, the stiffness characteristics, as the most important consideration for compliant mechanisms, are rarely involved.
Hongzhe Zhao, Yan Xie, Jingjun Yu
core   +1 more source

Variable Impedance Actuators: Moving the Robots of Tomorrow [PDF]

, 2012
Most of today's robots have rigid structures and actuators requiring complex software control algorithms and sophisticated sensor systems in order to behave in a compliant and safe way adapted to contact with unknown environments and humans.
Lefeber, D., Grioli, G., Haddadin, Sami, Stramigioli, S., A. Bicchi, Bicchi, Antonio, Carloni, R., Laffranchi, M., Haddadin, S., Jafari, A., Visser, L.C., Catalano, M.G., M. Catalano, Albu-Schäffer, Alin Olimpiu, Van Damme, M., F. Petit, Caldwell, D., M. Laffranchi, D. Caldwell, G. Ganesh, R. Carloni, Caldwell, D.G., Stramigioli, S.; id_orcid, Burdet, Etienne, Wolf, Sebastian, R. Van Ham, Garabini, M., B. Vanderborght, M. Grebenstein, S. Wolf, Catalano, M., Burdet, E., S. Haddadin, M. Garabini, Grebenstein, Markus, Ganesh, G., Vanderborght, B., D. Lefeber, M. Van Damme, Petit, F., Wolf, S., Van Ham, R., N. Tsagarakis, Albu-Schaeffer, A., Tsagarakis, N., Bicchi, A., E. Burdet, L. C. Visser   +47 more
core   +1 more source

Does Long‐Term Lower Extremity Strength Training in Adults With Knee Osteoarthritis and Varus Alignment Reduce Knee Joint Loading During Gait?

Arthritis Care &Research, EarlyView.
Objective We examined whether 18 months of strength training in individuals with knee varus alignment and medial tibiofemoral osteoarthritis (OA) reduced knee joint loads during walking compared to an attention control group. Methods This study was a secondary analysis of a randomized clinical trial that compared the effects of strength training to a ...
Stephen P. Messier, Matthew N. Vigliotti, Paige E. Rice, Brian Pietrosimone, Shannon L. Mihalko, Edward H. Ip, Richard F. Loeser, David J. Hunter, Ali Guermazi, Ryan Hill, Santiago Saldana, Kim L. Bennell, Paul DeVita   +12 more
wiley   +1 more source

A Variable Stiffness Actuator Based on Leaf Springs: Design, Model and Analysis

Actuators, 2022
In order to adapt to complex and changeable mechanical conditions and make the deformable mechanisms perform well statically and dynamically, variable stiffness joints have been studied extensively.
Yifan Lu, Yifei Yang, Yuan Xue, Jun Jiang, Qiang Zhang, Honghao Yue   +5 more
doaj   +1 more source

A Workflow to Accelerate Microstructure‐Sensitive Fatigue Life Predictions

Advanced Engineering Materials, EarlyView.
This study introduces a workflow to accelerate predictions of microstructure‐sensitive fatigue life. Results from frameworks with varying levels of simplification are benchmarked against published reference results. The analysis reveals a trade‐off between accuracy and model complexity, offering researchers a practical guide for selecting the optimal ...
Luca Loiodice, Krzysztof S. Stopka, Michael D. Sangid   +2 more
wiley   +1 more source

Embedded column base rotational stiffness model based on beam-on-elastic-foundation theory and component method

Results in Engineering
This study establishes a spring‑based mechanical model for predicting the rotational stiffness of embedded column bases (ECBs). The model idealises the embedded column segment as a beam on a Winkler foundation and represents the base‑plate restraint ...
Xiaoxu Xu, Jiafeng Lyu, Bo Jin
doaj   +1 more source

Study on Angular Free Vibration Stability and Parameters Influence of Dry Gas Seal Based on the Characteristic Equation

Shock and Vibration, 2022
Based on Laplace transform and Hurwitz stability criterion, the system characteristic equation and algebraic stability criterion of the two degree-of-freedom angular free vibration of dry gas seal are derived. The effects of rotational inertia, stiffness
Liming Teng, Jinbo Jiang, Xudong Peng, Jiyun Li, Simin Zheng   +4 more
doaj   +1 more source

A Numerical–Experimental Approach for Multi‐Matrix Fiber‐Reinforced Plastics Characterization Using Finite Element Model Updating

Advanced Engineering Materials, EarlyView.
A numerical–experimental framework is developed for characterizing multi‐matrix fiber‐reinforced polymers (MM‐FRPs) combining epoxy and polyurethane matrices. Harmonic bending tests are integrated with finite element model updating (FEMU) to simultaneously identify elastic and viscoelastic material parameters.
Rodrigo M. Dartora, Tales V. Lisbôa, Axel Spickenheuer, Rogério J. Marczak, Jakson M. Vassoler   +4 more
wiley   +1 more source

Acoustic displacement triangle based on the individual element test

Latin American Journal of Solids and Structures
A three node -displacement based- acoustic element is developed. In order to avoid spurious rotational modes, a higher order stiffness is introduced. This higher order stiffness is developed from an incompatible strain field which computes element volume
S. Correa, C. Militello, M. Recuero
doaj   +1 more source

Comparative analysis of using degree of rigidity and rotational stiffness of connections in structural design

, 2018
Using classical formulation of stiffness method, impact of semi-rigid connections on the stresses and strains can be analyzed by the degree of rigidity or by rotational stiffness of connections.
Srdjan Zivkovic, Marko Milosevic, Marija Spasojevic-Surdilovic, Dragana Turnic   +3 more
core   +2 more sources