scholarly journals Design and computer simulation of automatically controlled hydromechanical system for looped wedge wire screen elements fabrication

2021 ◽  
Vol 27 (4) ◽  
pp. 149-155
Author(s):  
Ivan Milićević ◽  
Milan Marjanović ◽  
Vojislav Vujičić ◽  
Snežana Dragićević ◽  
Nedeljko Dučić ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Entire System ◽  
Mechatronic System ◽  
Control Subsystem ◽  
Wire Screen ◽  
Operation Process ◽  
Hydromechanical System

The article presents a design of mechatronic system used for the production of wire elements used in looped wedge wire screen manufacturing. Details related to the design of the hydromechanical subsystem, the control subsystem, as well as the simulation of the operation process of the entire system are presented

scholarly journals Application of Computer 3D Digital Technology in Surgical Treatment of Pediatric Skull Deformity

2020 ◽  
Vol 185 ◽  
pp. 03025
Author(s):  
Li Xiang ◽  
Lu Zheng ◽  
Li Zhicen ◽  
Zhu Wanchun ◽  
He Jintao ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Digital Technology ◽  
Intraoperative Bleeding ◽  
Operation Process ◽  
Computer Aided ◽  
Cranial Deformity ◽  
Simulation Surgery ◽  
Surgical Difficulty ◽  
Skull Deformity ◽  
Immediate Surgery

Pediatric skull deformity requires immediate surgery as indicated by increased cranial pressure, mental retardation, impaired or absent vision, cranial deformity, and mental and spiritual defects. This study explores the application value of computer aided simulation in treatment of pediatric skull deformity. The application of computer simulation surgery in the treatment of children with pediatric skull deformity allows surgeons to be familiar with the operation process in advance. The use of computer 3D digital technology for preoperative design planning and simulation can reduce surgical difficulty to a certain extent, improve surgical efficiency, significantly increase intraoperative accuracy, and also reduce the risk of intraoperative bleeding and postoperative complications.

Dynamic Workspace and Control of Planar Active Tensegrity-Like Structures

2008 ◽  
Author(s):  
Andrew P. Schmalz ◽  
Sunil K. Agrawal
Keyword(s):  
Computer Simulation ◽  
Feedback Linearization ◽  
Null Space ◽  
System Dynamic ◽  
Initial Configuration ◽  
Dynamic Equations ◽  
Entire System ◽  
Tensegrity Structures ◽  
And Control

This paper addresses the issues of control and workspace determination of planar active tensegrity or tensegrity-like structures. The motion of such structures is generally produced by actuated cables, which cannot tolerate compressive forces. Hence, a controller which not only satisfies the system dynamic equations, but also maintains positive tension in cables is necessary. A null-space controller based on feedback linearization theory is developed for this purpose. This controller utilizes redundant active cables to overactuate the system. The concept of a ‘dynamic workspace’ for these structures is then introduced. This workspace consists of all configurations that are achievable from a given initial configuration while maintaining positive tensions throughout the entire system motion and is a powerful tool in analyzing the performance of a variety of tensegrity structures. This idea extends the concept of the static workspace, which consists of statically maintainable configurations, by incorporating system motion and dynamics to guarantee positive tensions during transition between the states. A critical benefit of this procedure is that it may be used to find the dynamic workspace of a system regardless of whether actuator redundancy is utilized, and thus can be used to objectively illustrate the degree to which overactuation improves mobility of a tensegrity structure. The effectiveness of the developed concepts is demonstrated through computer simulation and actual physical experimentation.

scholarly journals Computer Simulation in Predicting Biochemical Processes and Energy Balance at WWTPs

2018 ◽  
Vol 30 ◽  
pp. 03007 ◽  
Author(s):  
Jakub Drewnowski ◽  
Ewa Zaborowska ◽  
Carmen Hernandez De Vega
Keyword(s):  
Computer Simulation ◽  
Energy Balance ◽  
Biogas Production ◽  
Pollutant Emissions ◽  
Actual Process ◽  
Operational Parameters ◽  
Biochemical Processes ◽  
Batch Tests ◽  
Operation Process ◽  
And Control

Nowadays, the use of mathematical models and computer simulation allow analysis of many different technological solutions as well as testing various scenarios in a short time and at low financial budget in order to simulate the scenario under typical conditions for the real system and help to find the best solution in design or operation process. The aim of the study was to evaluate different concepts of biochemical processes and energy balance modelling using a simulation platform GPS-x and a comprehensive model Mantis2. The paper presents the example of calibration and validation processes in the biological reactor as well as scenarios showing an influence of operational parameters on the WWTP energy balance. The results of batch tests and full-scale campaign obtained in the former work were used to predict biochemical and operational parameters in a newly developed plant model. The model was extended with sludge treatment devices, including anaerobic digester. Primary sludge removal efficiency was found as a significant factor determining biogas production and further renewable energy production in cogeneration. Water and wastewater utilities, which run and control WWTP, are interested in optimizing the process in order to save environment, their budget and decrease the pollutant emissions to water and air. In this context, computer simulation can be the easiest and very useful tool to improve the efficiency without interfering in the actual process performance.

Dynamic Workspace and Control of Planar Active Tensegritylike Structures

2008 ◽  
Vol 130 (12) ◽  
Author(s):  
Andrew P. Schmalz ◽  
Sunil K. Agrawal
Keyword(s):  
Computer Simulation ◽  
Feedback Linearization ◽  
Null Space ◽  
System Dynamic ◽  
Initial Configuration ◽  
Dynamic Equations ◽  
Entire System ◽  
Tensegrity Structures ◽  
And Control

This paper addresses the issues of control and workspace determination of planar active tensegrity or tensegritylike structures. The motion of such structures is generally produced by actuated cables, which cannot tolerate compressive forces. Hence, a controller, which not only satisfies the system dynamic equations but also maintains positive tension in cables, is necessary. A null-space controller based on feedback linearization theory is developed for this purpose. This controller utilizes redundant active cables to overactuate the system. The concept of a “dynamic workspace” for these structures is then introduced. This workspace consists of all configurations that are achievable from a given initial configuration while maintaining positive tensions throughout the entire system motion, and it is a powerful tool in analyzing the performance of a variety of tensegrity structures. This idea extends the concept of the static workspace, which consists of statically maintainable configurations, by incorporating system motion and dynamics to guarantee positive tensions during transition between the states. A critical benefit of this procedure is that it may be used to find the dynamic workspace of a system regardless of whether actuator redundancy is utilized, and thus it can be used to objectively illustrate the degree to which overactuation improves mobility of a tensegrity structure. The effectiveness of the developed concepts is demonstrated through computer simulation and actual physical experimentation.

scholarly journals Simulation study of the hydraulic transmitter-receiver system

2019 ◽  
Vol 254 ◽  
pp. 03001
Author(s):  
Damian Frąckowiak
Keyword(s):  
Computer Simulation ◽  
Simulation Study ◽  
Entire System ◽  
Correct Operation ◽  
Receiver System ◽  
Measurement Results

The paper presents a hydraulic transmitter receiver system which is characterized by the ability to remotely send information utilizing a single hydraulic line. The system was subject to computer simulation in the software Fluid-SIM Hydraulics, and based on the obtained measurement results the influence of the parameters of its components on the correct operation of the entire system was determined.

scholarly journals A Concept of Reliability Assessment Simulation Model Using Systems Structural Decomposition

2018 ◽  
Vol 46 (1) ◽  
pp. 51-74
Author(s):  
Stanisław Młynarski ◽  
Robert Pilch ◽  
Maksymilian Smolnik ◽  
Jan Szybka ◽  
Grzegorz Wiązania
Keyword(s):  
Computer Simulation ◽  
Simulation Model ◽  
Reliability Assessment ◽  
Reliability Estimation ◽  
Entire System ◽  
Structural Decomposition ◽  
Technical Systems

Abstract The paper presents a concept of reliability estimation of the renewable technical systems consisting of the objects functioning in koon structures. The estimation is performed using computer simulation. Practical dependence between the failure of the entire system and the failures of the objects and elements from which the objects are made are taken into account as the result of the structural decomposition of the system conducted.

scholarly journals Monte Carlo Simulation for Optimization of Object Operation Process and Reliability / SYMULACJA MONTE CARLO W OPTYMALIZACJI PROCESU EKSPLOATACJI ORAZ NIEZAWODNOŚCI OBIEKTU TECHNICZNEGO

2012 ◽  
Vol 24 (1) ◽  
pp. 79-92 ◽  
Author(s):  
Krzysztof Kołowrocki ◽  
Ewa Kuligowska ◽  
Joanna Soszyńska-Budny
Keyword(s):  
Computer Simulation ◽  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Reliability Function ◽  
Unknown Parameters ◽  
Operation Conditions ◽  
Reliability Characteristics ◽  
Operation Process ◽  
Transient Probabilities ◽  
Computer Simulation Technique

Abstract This paper presents the computer simulation technique related to the reliability of an object under variable operation conditions. The Monte Carlo simulation is performed and, consequently, the unknown parameters for the considered object operation process and its main reliability characteristics are identified. The optimal transient probabilities of the object operation process at the particular operation states and its optimal unconditional reliability function are determined.

A freeze-fracture-etched study of the physarum polycephalum plasma membrane during early formation of the macroplasmodial stage

1993 ◽  
Vol 51 ◽  
pp. 346-347
Author(s):  
Randolph W. Taylor ◽  
Henrie Treadwell
Keyword(s):  
Plasma Membrane ◽  
Life Cycle ◽  
Growth Phase ◽  
Filter Paper ◽  
Physarum Polycephalum ◽  
Freeze Fracture ◽  
Petri Dish ◽  
Wire Screen ◽  
Wide Mouth ◽  
Sterile Filter

The plasma membrane of the Slime Mold, Physarum polycephalum, process unique morphological distinctions at different stages of the life cycle. Investigations of the plasma membrane of P. polycephalum, particularly, the arrangements of the intramembranous particles has provided useful information concerning possible changes occurring in higher organisms. In this report Freeze-fracture-etched techniques were used to investigate 3 hours post-fusion of the macroplasmodia stage of the P. polycephalum plasma membrane.Microplasmodia of Physarum polycephalum (M3C), axenically maintained, were collected in mid-expotential growth phase by centrifugation. Aliquots of microplasmodia were spread in 3 cm circles with a wide mouth pipette onto sterile filter paper which was supported on a wire screen contained in a petri dish. The cells were starved for 2 hrs at 24°C. After starvation, the cells were feed semidefined medium supplemented with hemin and incubated at 24°C. Three hours after incubation, samples were collected randomly from the petri plates, placed in plancettes and frozen with a propane-nitrogen jet freezer.

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.

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