Results 61 to 70 of about 514 (266)

Soft Robotic Snake with Tunable Undulatory Gait for Efficient Underwater Locomotion

Advanced Robotics Research, EarlyView.
This study designs an underwater soft snake robot using 3D‐printed soft actuators, controlled by specific signals to generate sinusoidal undulation. Results show a positive correlation between speed and swing amplitude, with optimal performance at 2/3π phase offset, PLA tail, 1.2 voltage growth rate, and 6s undulation period achieving a maximum speed ...
Huichen Ma, Junjie Zhou, Raye Yeow
wiley   +1 more source

Digital sub-millimeter bubble-jets

Physics of Fluids
We create digital sub-millimeter bubble-jet emission in gas–liquid co-flows at a tapered chip zone for moderate Re. Self-similarity features are revealed, giving birth to a local model. Local self-scaling quantities are introduced to scale energies and progresses at onsets of bubble-jets, which gives a highly universal phase diagram and also a scaling ...
Biju Ruan, Zhiliang Wang
openaire   +2 more sources

A Comprehensive Sub-Grid Air Entrainment Model for RaNS Modeling of Free-Surface Bubbly Flows [PDF]

, 2011
The simulation of free surface bubbly flows using a two-fluid model remains a challenging problem in part due to the lack of a comprehensive air entrainment model that can predict the rate and location of air entrainment for a wide range of flows.
Donald A. Drew, Assad A. Oberai, Jingsen Ma, Richard T. Lahey, Mark C. Hyman   +4 more
core   +1 more source

Multimodal Locomotion in Insect‐Inspired Microrobots: A Review of Strategies for Aerial, Surface, Aquatic, and Interfacial Motion

Advanced Robotics Research, EarlyView.
This review identifies key design considerations for insect‐inspired microrobots capable of multimodal locomotion. To draw inspiration, biological and robotic strategies for moving in air, on water surfaces, and underwater are examined, along with approaches for crossing the air–water interface.
Mija Jovchevska, Kaushik Jayaram, Nicole Xu   +2 more
wiley   +1 more source

Tumbling Magnetic Microrobots for Targeted In Vivo Drug Delivery in the GI Tract

Advanced Robotics Research, EarlyView.
We introduce a microrobot design and integrated system for on‐demand targeted drug release in the gastrointestinal tract. The microrobot has an embedded magnet for actuation with external magnetic fields and is visualized in real time using ultrasound. It has two drug release ports sealed with a thermally sensitive wax. Local heating of the wax using a
Aaron C. Davis, Luis Carlos Sanjuan Acosta, Shubh P. Mehta, Baiyan Qi, Yang Yang, Luis Solorio, Craig J. Goergen, David J. Cappelleri   +7 more
wiley   +1 more source

Jet speed in bubble rupture

Thermal Science, 2018
When a polymer bubble is broken in the bubble electrospinning process, thousands of thousands jets are produced with almost same initial ejecting speed, which plays a very important role on the formation of the nanofiber. In this paper, the nanofiber membranes were prepared by the bubble spinning with different air temperatures. This paper also gives a
Qi-Long Sun, Lei Sun, Xiao-Wen Wang, Jia-Ling Fang, Hai-Yan Kong, Ji-Huan He, Hu Gu   +6 more
openaire   +2 more sources

Experimental Study of Multiphase Jet Flow by Particle Imaging Velocimetry Measurement [PDF]

, 2019
Multiphase jet flow is commonly encountered in many engineering applications. In the present study, a laboratory scale experimental setup was built to measure the turbulent flow characteristics by using Particle Imaging Velocimetry (PIV) to evaluate the ...
Boufadel, Michel, Lin Zhao, Michel Boufadel, Wen Ji, Ji, Wen, Fangda Cui, Cui, Fangda, Feng Gao, Zhao, Lin, Gao, Feng   +9 more
core   +1 more source

Compliant Pneumatic Feet with Real‐Time Stiffness Adaptation for Humanoid Locomotion

Advanced Robotics Research, EarlyView.
A compliant pneumatic foot with real‐time variable stiffness enables humanoid robots to adapt to changing terrains. Using onboard vision and pressure control, the foot modulates stiffness within each gait cycle, reducing impact forces and improving balance. The design, cast in soft silicone with embedded air chambers and Kevlar wrapping, offers durable,
Irene Frizza, Hiroshi Kaminaga, Philippe Fraisse, Gentiane Venture   +3 more
wiley   +1 more source

Numerical Investigation using RANS Equations of Two-dimensional Turbulent Jets and Bubbly Mixing layers [PDF]

, 2010
This thesis presents numerical investigations of two-dimensional single-phase turbulent jets and bubbly mixing layers using Reynolds-Averaged Navier-Stokes (RANS) equations. The behavior of a turbulent jet confined in a channel depends on the Reynolds
Akhtar, Kareem
core  

Origami‐Inspired Structural Design for Aquatic‐Terrestrial Amphibious Robots

Advanced Robotics Research, EarlyView.
This work presents a lightweight amphibious origami robot actuated by a single shape memory alloy wire. A rigid foldable origami structure with displacement amplification enables efficient terrestrial crawling and aquatic swimming. The addition of fan‐shaped units allows controllable turning in both environments.
Weiqi Liu, Chunlong Wang, Xiaohang Sun, Hongwei Guo, Jiayao Ma, Yan Chen   +5 more
wiley   +1 more source