Results 81 to 90 of about 15,802,205 (308)

Multistage, Self‐Sensing Artificial Muscles With Coordination From Liquid Crystal Elastomer‐Graphene Composite Fibers

Advanced Functional Materials, EarlyView.
Inspired by skeletal muscles’ precision and endurance, CoilLCE integrates a self‐sensing liquid crystal elastomer/graphene artificial muscle with an embedded Joule‐heating copper coil, enabling closed‐loop multistage actuation with programmable intermediate states (strain accuracy of 2%), and antagonistic coordination (32% total strain). These features
Ziyun Zhang, Xuelin Wu, Yinding Chi, Qingya Huang, Yaoye Hong, Antonio Proctor Martinez, Jingxian Wu, Bingzhi He, Cynthia Sung, Shu Yang   +9 more
wiley   +1 more source

FastM: Design and Evaluation of a Fast Mobility Mechanism for Wireless Mesh Networks [PDF]

, 2009
Although there is a large volume of work in the literature in terms of mobility approaches for Wireless Mesh Networks, usually these approaches introduce high latency in the handover process and do not support realtime services and applications. Moreover,
Couto, Luís, Sargento, Susana, Aguiar, Rui Luís, Barraca, João   +3 more
core  

Time-varying mesh stiffness analysis of a single-roller enveloping hourglass worm gear

, 2018
As a new type of transmission, the single-roller enveloping hourglass worm gear (SEHWG) is widely used in precision mechanical transmission systems. Time-varying mesh stiffness (TVMS) is one of the most important excitations, which has great influences ...
Xianguang Kong, Qibin Wang, Jiantao Chang, Bo Zhao, Hongbo Ma   +4 more
core   +1 more source

2D Skeletal Muscle Thin Film Actuators Enhance Efficiency of Biohybrid Robots

Advanced Functional Materials, EarlyView.
2D skeletal muscle thin film actuators generate millinewton‐scale forces and millimeter‐scale strokes while remaining functional for over 30 days. Their force density is 20‐fold higher than 3D skeletal muscle actuators, enabling multi‐fin robots with tunable speed and multidirectional steering.
Maheera Bawa, Arielle Berman, Laura Schwendeman, Ferdows Afghah, Seanbiron Johnson, Ritu Raman   +5 more
wiley   +1 more source

Time-varying Meshing Stiffness Calculation of Spur Gears with Asymmetric Spalling Defects

International Journal of Mechanical and Electrical Engineering
Gear systems are subjected to repeated loads during long-term operation, and factors such as insufficient lubricant to increase friction between gears, resulting in elevated temperatures and wear, are highly susceptible to tooth spalling. Tooth spalling is a common form of failure in gear failure.
Wenqiang Han, Hanjun Jiang
openaire   +1 more source

Time-varying risk aversion : an application to energy hedging [PDF]

, 2009
Risk aversion is a key element of utility maximizing hedge strategies; however, it has typically been assigned an arbitrary value in the literature. This paper instead applies a GARCH-in-Mean (GARCH-M) model to estimate a time-varying measure of risk ...
Cotter, John, Hanly, Jim
core  

Microscale Patterning of Ultrahigh‐Viscosity Metallic‐Polymer Composites via Embedded Droplet Writing

Advanced Functional Materials, EarlyView.
A hybrid additive manufacturing platform integrates direct droplet writing of metallic composite with VAT photopolymerization to fabricate architected soft magnetic composites. This approach enables microscale patterning of high‐viscosity materials for programmable actuators, adaptive fluidic devices, and switchable adhesives, offering tunable ...
Yeowon Yoon, Jian Ni, Sungmo Park, Yang Xu, Yong Chen   +4 more
wiley   +1 more source

Research of the Bifurcation Characteristic of Helical Gear System with Considering Random Perturbation of Mesh Stiffness

Jixie chuandong, 2019
In order to study the influence of the random perturbation of time-varying mesh stiffness on the dynamics of the helical gearing system, based on Newton's law, a stochastic dynamics model of a six-degree-of-freedom helical gear system is established and ...
Yiyi Tou, Jianmin Li, Wei Wang, Haoze Wang, Wenhua Chen   +4 more
doaj  

Calculation and Analysis of Modified Gear Time-varying Meshing Stiffness based on Matlab

Jixie chuandong, 2022
Considering the real involute and transition curve equation of gears，an accurate model of gears is conducted. The deformation of modified gear is deduced and calculated by Weber energy method. The mapping relationships of load angle βj，pressure angle αk，rotation angle tan αk and coordinate XMj of load point are deduced.
Dongjiang Cao, Peng Shang, Yang Zhao
openaire   +1 more source

Dynamic analysis of gear broken teeth considering time-varying mesh stiffness

Journal of Physics, Conference Series
Gear tooth breakage is one of the most severe faults in gear rotor bearing systems. It changes the local tooth geometry, weakens the time-varying mesh stiffness, and produces periodic impacts in dynamic transmission error and dynamic mesh force.
Shuo Xue, Fuhao Liu, Hongzhi Liu
semanticscholar   +1 more source