3744 Computer Simulation of Modal Control of Vibration of Machine Structure : By Means of Electromagnetic Exciters and PID Compensators

2006 ◽  
Vol 2006.5 (0) ◽  
pp. 455-456
Author(s):  
Tetsuo SATO
Keyword(s):  
Computer Simulation ◽  
Modal Control ◽  
Machine Structure

Application of Computer Simulation Technology in the Analysis for Gilling Machine Structure

2011 ◽  
Vol 291-294 ◽  
pp. 2364-2368
Author(s):  
Li Jiao Pan ◽  
Zi Tang Yu ◽  
Yong Ming He
Keyword(s):  
Computer Simulation ◽  
Maximum Stress ◽  
Simulation Analysis ◽  
Model Simulation ◽  
Operating Mode ◽  
Gear Ratio ◽  
Mode Shapes ◽  
Assembly Model ◽  
Simulation Technology ◽  
Machine Structure

The application of computer simulation technology in engineering design and analysis fields can effectively reduce product production cost, and improve the design efficiency. Through the computer simulation analysis of the key structure of gilling machine, the maximum stress value and its position of the working screw can be obtained in the working condition when roller’s linear velocity are at 1st and 2nd gear ratio, respectively, about 66.0m/min and 57.0m/min. In addition, in the assembly model simulation analysis of gilling machine structure, the influence of prestress simulation is considered and obtained the first 4 order’s natural frequencies and mode shapes in two kinds of gear ratios in those working conditions. It provides some suggestions that can be used to research the effect factors of gilling machine design, the gilling machine structure optimization and operating mode control.

Characterization of Modulated Structure Through Structure Images and their Computer Simulation

1990 ◽  
Vol 48 (1) ◽  
pp. 70-71
Author(s):  
Kiyomichi Nakai ◽  
Yusuke Isobe ◽  
Chiken Kinoshita ◽  
Kazutoshi Shinohara
Keyword(s):  
Computer Simulation ◽  
High Resolution ◽  
Spherical Aberration ◽  
High Resolution Electron Microscopy ◽  
Basic Mechanism ◽  
Objective Lens ◽  
Specimen Thickness ◽  
Transmitted Beam ◽  
Modulated Structure ◽  
Resolution Electron

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.

Averting robo-bees: why free-flying robotic bees are a bad idea

2019 ◽  
Vol 3 (6) ◽  
pp. 723-729
Author(s):  
Roslyn Gleadow ◽  
Jim Hanan ◽  
Alan Dorin
Keyword(s):  
Climate Change ◽  
Computer Simulation ◽  
Food Security ◽  
European Countries ◽  
Plant Interactions ◽  
Plant Insect Interactions ◽  
Native Habitat ◽  
Insect Pollinators ◽  
Insect Interactions

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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