scholarly journals A Computer Simulation for the Net Position Control of Midwater Trawl System.

2001 ◽  
Vol 67 (2) ◽  
pp. 226-230 ◽  
Author(s):  
Fuxiang Hu ◽  
Tadashi Tokai ◽  
Ko Matuda
2007 ◽  
Vol 19 (6) ◽  
pp. 604-611 ◽  
Author(s):  
Daisuke Chugo ◽  
◽  
Wataru Matsuoka ◽  
Songmin Jia ◽  
Kunikatsu Takase

The walker with power assistance for standing we propose focuses on home use for those requiring daily assistance. Our key concepts involve (1) a new assistance manipulator with four parallel linkages using smaller actuators and rigid with lighter linkages than general manipulators, providing compact assistance at low cost; and (2) a combination of force and position control. Based on the user’s posture while standing, our proposed control selects appropriate control using the reference of standing based on typical standing by nursing specialists for realizing natural assistance. The conductance of our proposed assistance is verified by computer simulation and experiments using a prototype.


1981 ◽  
Vol 23 (3) ◽  
pp. 121-129
Author(s):  
C. Backhouse ◽  
J. Rees Jones

This paper describes a dynamic simulation of a robot-manipulator implemented on an analogue computer and under position control of a microcomputer. A method of dynamics based on constraints is developed which enables the simulation to be implemented on a computer of limited capacity. Hydraulic motors, controlled by electrohydraulic servo-valves are modelled at each joint. Results of displacement, velocity and motor load pressures are shown for example motions, and the interdependence of link motion is discussed. The potential uses of the analogue simulation in research and development of manipulators and their control algorithms are described.


2010 ◽  
Vol 2010 (0) ◽  
pp. 541-542 ◽  
Author(s):  
Hiroki CHO ◽  
Takaei YAMAMOTO ◽  
Michihiro UEGAKI ◽  
Toshio SAKUMA

Author(s):  
Kiyomichi Nakai ◽  
Yusuke Isobe ◽  
Chiken Kinoshita ◽  
Kazutoshi Shinohara

Induced spinodal decomposition under electron irradiation in a Ni-Au alloy has been investigated with respect to its basic mechanism and confirmed to be caused by the relaxation of coherent strain associated with modulated structure. Modulation of white-dots on structure images of modulated structure due to high-resolution electron microscopy is reduced with irradiation. In this paper the atom arrangement of the modulated structure is confirmed with computer simulation on the structure images, and the relaxation of the coherent strain is concluded to be due to the reduction of phase-modulation.Structure images of three-dimensional modulated structure along <100> were taken with the JEM-4000EX high-resolution electron microscope at the HVEM Laboratory, Kyushu University. The transmitted beam and four 200 reflections with their satellites from the modulated structure in an fee Ni-30.0at%Au alloy under illumination of 400keV electrons were used for the structure images under a condition of the spherical aberration constant of the objective lens, Cs = 1mm, the divergence of the beam, α = 3 × 10-4 rad, underfocus, Δf ≃ -50nm and specimen thickness, t ≃ 15nm. The CIHRTEM code was used for the simulation of the structure image.


2019 ◽  
Vol 3 (6) ◽  
pp. 723-729
Author(s):  
Roslyn Gleadow ◽  
Jim Hanan ◽  
Alan Dorin

Food security and the sustainability of native ecosystems depends on plant-insect interactions in countless ways. Recently reported rapid and immense declines in insect numbers due to climate change, the use of pesticides and herbicides, the introduction of agricultural monocultures, and the destruction of insect native habitat, are all potential contributors to this grave situation. Some researchers are working towards a future where natural insect pollinators might be replaced with free-flying robotic bees, an ecologically problematic proposal. We argue instead that creating environments that are friendly to bees and exploring the use of other species for pollination and bio-control, particularly in non-European countries, are more ecologically sound approaches. The computer simulation of insect-plant interactions is a far more measured application of technology that may assist in managing, or averting, ‘Insect Armageddon' from both practical and ethical viewpoints.


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