Plane viscoplastic flow in narrow channels with deformable walls

1996 ◽  
Vol 31 (2) ◽  
pp. 178-185 ◽  
Author(s):  
A. V. Gnoevoi ◽  
D. M. Klimov ◽  
A. G. Petrov ◽  
V. M. Chesnokov
Keyword(s):  
Viscoplastic Flow ◽  
Narrow Channels ◽  
Deformable Walls

Investigating the potential of redundant manipulators in narrow channels

2020 ◽  
pp. 095440622096451
Author(s):  
Ashish Singla ◽  
Jyotindra Narayan ◽  
Himanshu Arora
Keyword(s):  
Case Studies ◽  
Fuzzy Inference ◽  
Redundant Manipulators ◽  
Redundancy Resolution ◽  
Inference System ◽  
Narrow Channels ◽  
First Case ◽  
Task Priority ◽  
Patient Side

In this paper, an attempt has been made to investigate the potential of redundant manipulators, while tracking trajectories in narrow channels. The behavior of redundant manipulators is important in many challenging applications like under-water welding in narrow tanks, checking the blockage in sewerage pipes, performing a laparoscopy operation etc. To demonstrate this snake-like behavior, redundancy resolution scheme is utilized using two different approaches. The first approach is based on the concept of task priority, where a given task is split and prioritize into several subtasks like singularity avoidance, obstacle avoidance, torque minimization, and position preference over orientation etc. The second approach is based on Adaptive Neuro Fuzzy Inference System (ANFIS), where the training is provided through given datasets and the results are back-propagated using augmentation of neural networks with fuzzy logics. Three case studies are considered in this work to demonstrate the redundancy resolution of serial manipulators. The first case study of 3-link manipulator is attempted with both the approaches, where the objective is to track the desired trajectory while avoiding multiple obstacles. The second case study of 7-link manipulator, tracking trajectory in a narrow channel, is investigated using the concept of task priority. The realistic application of minimum-invasive surgery (MIS) based trajectory tracking is considered as the third case study, which is attempted using ANFIS approach. The 5-link spatial redundant manipulator, also known as a patient-side manipulator being developed at CSIR-CSIO, Chandigarh is used to track the desired surgical cuts. Through the three case studies, it is well demonstrated that both the approaches are giving satisfactory results.

scholarly journals Premixed-flame oscillations in narrow channels

2019 ◽  
Vol 4 (10) ◽  
Author(s):  
Daniel Martínez-Ruiz ◽  
Fernando Veiga-López ◽  
Mario Sánchez-Sanz
Keyword(s):  
Premixed Flame ◽  
Narrow Channels

Polymer Electrolyte Actuator Driven by Low Voltage

1999 ◽  
Vol 600 ◽  
Author(s):  
K. Oguro ◽  
K. Asaka ◽  
N. Fujiwara ◽  
K. Onishi ◽  
S. Sewa
Keyword(s):  
Polymer Electrolyte ◽  
Low Voltage ◽  
Polymer Electrolyte Membrane ◽  
Water Channel ◽  
Artificial Muscle ◽  
Ion Exchange Resin ◽  
Channel Structure ◽  
Narrow Channels ◽  
Electrolyte Membrane ◽  
Counter Ion

AbstractComposites of perfluorinated polymer electrolyte membrane and gold electrodes bend in response to low-voltage electric stimuli and work as soft actuators like muscles. The composites were prepared by chemical plating. Charge on the electrode induces electric double layer and electro-osmotic drag of water by cation from anode to cathode through narrow channels in the perfluorinated ion-exchange resin. The electro-osmotic flow of water swells the polymer near the cathode rather than anode, and the membrane bends to the anode. The actuator comprises polymer electrolyte, electrodes, counter ion, solvent, lead wires, etc. Each component affects the performance of the actuator. Surface area of electrode and species of counter ion have drastic effect on voltage-displacement response. The response may depend on water channel structure of the polymer electrolyte. Modification of these factors improved the performance and resulted in the deflection over 360 degrees at a film actuator of 10 mm length. A tubular actuator was demonstrated as a multidirectional actuator. These actuators are applicable to artificial muscle, micro robots, or micro medical equipment inside body.

Experimental Study on Heat Transfer Augmentation for High Heat Flux Removal in Rib-Roughened Narrow Channels

1998 ◽  
Vol 35 (9) ◽  
pp. 671-678 ◽  
Author(s):  
Md. Shafiqul ISLAM ◽  
Ryutaro HINO ◽  
Katsuhiro HAGA ◽  
Masanori MONDE ◽  
Yukio SUDO
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Heat Flux ◽  
High Heat ◽  
High Heat Flux ◽  
Narrow Channels ◽  
Heat Transfer Augmentation ◽  
Rib Roughened

Viscoplastic flow of planar granular materials

1993 ◽  
Vol 16 (1-2) ◽  
pp. 1-12 ◽  
Author(s):  
B. Balendran ◽  
Sia Nemat-Nasser
Keyword(s):  
Granular Materials ◽  
Viscoplastic Flow
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