scholarly journals An optimum magnetic control torque generation of a momentum bias satellite

2014 ◽  
Vol 8 (2) ◽  
pp. 169-180 ◽  
Author(s):  
Nurulasikin Suhadis ◽  
Renuganth Varatharajoo
Keyword(s):  
Magnetic Control ◽  
Control Torque ◽  
Torque Generation ◽  
Momentum Bias

scholarly journals Yaw control torque generation for a hovering robotic hummingbird

2019 ◽  
Vol 16 (1) ◽  
pp. 172988141882396 ◽  
Author(s):  
Ali Roshanbin ◽  
André Preumont
Keyword(s):  
Control Mechanism ◽  
Cross Coupling ◽  
Parallel Mechanisms ◽  
Design Development ◽  
Control Torque ◽  
Coupling Effects ◽  
Flight Tests ◽  
Wing Kinematics ◽  
Yaw Control ◽  
Torque Generation

This study describes the design, development, and flight tests of a novel control mechanism to generate yaw control torque of a hovering robotic hummingbird (known as Colibri). The proposed method generates yaw torque by modifying the wing kinematics while minimizing its influence on roll and pitch torques. To achieve this, two different architectures of series and parallel mechanisms are investigated; they are mathematically analyzed to investigate their behavior with respect to cross-coupling effects. The analysis is verified by measuring the control torque characteristics. The efficacy of the proposed method is also explored by flight experiments.

Passive Attitude Control Torque Generation Performances of a Gravity Gradient Stabilized Satellite

2012 ◽  
Vol 225 ◽  
pp. 458-463 ◽  
Author(s):  
Nurulasikin Mohd Suhadis ◽  
Renuganth Varatharajoo
Keyword(s):  
Attitude Control ◽  
Control Algorithm ◽  
Low Earth Orbit ◽  
Gravity Gradient ◽  
Control Torque ◽  
Satellite Mission ◽  
Torque Generation ◽  
Geomagnetic Field Models ◽  
Geomagnetic Fields ◽  
Operation Results

In this paper, the Proportional-Derivative (PD) based attitude control algorithm of the gravity gradient stabilized satellite has been developed. The satellite is equipped with 3 magnetic torquers where each of the magnetic torquer is placed along the +x, +y, +z axes. The control torque is generated when the magnetic field generated by the magnetic torquers couples with the geomagnetic fields, whereby the vector of the generated torque is perpendicular to both the magnetic fields. The developed control algorithm was simulated using the complex and simplified geomagnetic field models for a Low Earth Orbit (LEO) satellite mission in a nominal attitude operation. Results from simulations exhibit the effectiveness of the attitude control torque generation that fulfills the mission attitude control requirements.

scholarly journals Transfer and generalization of learned manipulation between unimanual and bimanual tasks

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Trevor Lee-Miller ◽  
Marco Santello ◽  
Andrew M. Gordon
Keyword(s):  
Learning Transfer ◽  
Center Of Pressure ◽  
Center Of Mass ◽  
Pressure Point ◽  
Torque Generation ◽  
Before And After ◽  
Object Center ◽  
High Level ◽  
Bimanual Grasping ◽  
Partial Learning

AbstractSuccessful object manipulation, such as preventing object roll, relies on the modulation of forces and centers of pressure (point of application of digits on each grasp surface) prior to lift onset to generate a compensatory torque. Whether or not generalization of learned manipulation can occur after adding or removing effectors is not known. We examined this by recruiting participants to perform lifts in unimanual and bimanual grasps and analyzed results before and after transfer. Our results show partial generalization of learned manipulation occurred when switching from a (1) unimanual to bimanual grasp regardless of object center of mass, and (2) bimanual to unimanual grasp when the center of mass was on the thumb side. Partial generalization was driven by the modulation of effectors’ center of pressure, in the appropriate direction but of insufficient magnitude, while load forces did not contribute to torque generation after transfer. In addition, we show that the combination of effector forces and centers of pressure in the generation of compensatory torque differ between unimanual and bimanual grasping. These findings highlight that (1) high-level representations of learned manipulation enable only partial learning transfer when adding or removing effectors, and (2) such partial generalization is mainly driven by modulation of effectors’ center of pressure.

scholarly journals Genetically magnetic control of neural system via TRPV4 activation with magnetic nanoparticles

Nano Today ◽  
2021 ◽  
Vol 39 ◽  
pp. 101187
Author(s):  
Songfang Wu ◽  
Hong Li ◽  
Dongqi Wang ◽  
Luming Zhao ◽  
Xin Qiao ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Neural System ◽  
Magnetic Control

Magnetic control of ferroelectric interfaces

2011 ◽  
Vol 23 (20) ◽  
pp. 202203 ◽  
Author(s):  
S Dussan ◽  
A Kumar ◽  
R S Katiyar ◽  
S Priya ◽  
J F Scott
Keyword(s):  
Magnetic Control

Shortening of muscle relaxation time after creatine loading

1999 ◽  
Vol 86 (3) ◽  
pp. 840-844 ◽  
Author(s):  
M. van Leemputte ◽  
K. Vandenberghe ◽  
P. Hespel
Keyword(s):  
Relaxation Time ◽  
Muscle Relaxation ◽  
Muscle Contractions ◽  
Contraction Time ◽  
Healthy Male ◽  
Healthy Male Volunteers ◽  
Torque Generation ◽  
Isometric Torque ◽  
The Mean ◽  
Isometric Muscle

The effect of creatine (Cr) supplementation on muscle isometric torque generation and relaxation was investigated in healthy male volunteers. Maximal torque (Tmax), contraction time (CT) from 0.25 to 0.75 of Tmax, and relaxation time (RT) from 0.75 to 0.25 of Tmax were measured during 12 maximal isometric 3-s elbow flexions interspersed by 10-s rest intervals. Between the pretest and the posttest, subjects ingested Cr monohydrate (4 × 5 g/day; n = 8) or placebo ( n = 8) for 5 days. Pretest Tmax, CT, and RT were similar in Cr and placebo groups. Also in the posttest, Tmax and CT were similar between groups. However, posttest RT was decreased consistently by ∼20% ( P < 0.05) in the Cr group from the first to the last of the 12 contractions. In addition, the mean decrease in RT after Cr loading was positively correlated with pretest RT ( r = 0.82). It is concluded that Cr loading facilitates the rate of muscle relaxation during brief isometric muscle contractions without affecting torque production.

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