Glow-spark switching by a dielectric wall in a pin-to-electrolyte discharge

2015 ◽  
Vol 81 (4) ◽  
Author(s):  
Masoud Rezvani Jalal ◽  
Javad Rezvani Jalal ◽  
Saeed Fakhry ◽  
Feyzolla Younesi Zadeh ◽  
Faezeh Alvand
Keyword(s):  
Simple Model ◽  
Electrolyte Solution ◽  
Electrical Discharge ◽  
Discharge Circuit ◽  
Cylindrical Shape ◽  
Dielectric Wall ◽  
Simulation Results

In this paper, the shape, sound, and current of an electrical discharge in the air between a metal pin and an electrolyte solution are studied. Two different situations are considered: (A) without, and, (B) with inclusion of a dielectric wall in the discharge circuit. It is found that: (1) the discharge A has a cylindrical shape rather than a branched shape in discharge B, (2) the sound and current of discharge in case A are coherent and deterministic but those of case B are incoherent and stochastic. These differences along with the simulation results of a simple model demonstrate that the discharge in case A is glow, but, that in case B is spark.

A convection-free electrolysis cell in which a steady state is attainable

1980 ◽  
Vol 58 (18) ◽  
pp. 1966-1972 ◽  
Author(s):  
M. Alison Armitage ◽  
Gerald A. Brydon ◽  
Paul J. J. Connelly ◽  
Chummer J. E. Farina ◽  
Heather L. Gordon ◽  
...  
Keyword(s):  
Porous Medium ◽  
Steady State ◽  
Simple Model ◽  
Pore Structure ◽  
Electrolyte Solution ◽  
Aqueous Electrolyte ◽  
Electrolysis Cell ◽  
A Cell ◽  
Porous Matrices ◽  
Mercurous Ion

Studies of a cell consisting of a sheet of a porous medium soaked with an aqueous electrolyte solution containing the mercurous ion and sandwiched between mercury pools show that steady-state electrolysis may be attained in the absence of convection. Several different porous matrices have been studied and, in some cases, a very simple model of the pore structure predicts behaviour close to that observed experimentally.

Power Management in Hydraulically Actuated Mobile Equipment

2007 ◽  
Author(s):  
Henrik C. Pedersen ◽  
Torben O. Andersen ◽  
Michael R. Hansen
Keyword(s):  
Simple Model ◽  
Power Management ◽  
Dynamic Properties ◽  
Optimization Procedure ◽  
Electronic Control ◽  
Hydraulic Systems ◽  
Modes Of Operation ◽  
Management Algorithm ◽  
System A ◽  
Simulation Results

The focus of the current paper is on the control of hydraulic systems when utilizing the advances that electronic control may bring with regard to power management, prioritized flow sharing and anti-stall, arising from being able to control both pump, valves and engine electronically. A simple model of a backhoe loader is first presented. Based on this model and the dynamic properties of the system, a generally applicable power management algorithm is developed based on an optimization procedure, which takes into account the dynamics of the system and different modes of operation and saturation. Finally the algorithm is verified through simulation results and the possibilities and limitations of the algorithm are discussed.

Slow Feature Analysis: A Theoretical Analysis of Optimal Free Responses

2003 ◽  
Vol 15 (9) ◽  
pp. 2147-2177 ◽  
Author(s):  
Laurenz Wiskott
Keyword(s):  
Simple Model ◽  
Theoretical Analysis ◽  
Visual System ◽  
Efficient Algorithm ◽  
Optimization Problem ◽  
Feature Analysis ◽  
Slow Feature Analysis ◽  
Input Signals ◽  
Invariant Representations ◽  
Simulation Results

Temporal slowness is a learning principle that allows learning of invariant representations by extracting slowly varying features from quickly varying input signals. Slow feature analysis (SFA) is an efficient algorithm based on this principle and has been applied to the learning of translation, scale, and other invariances in a simple model of the visual system. Here, a theoretical analysis of the optimization problem solved by SFA is presented, which provides a deeper understanding of the simulation results obtained in previous studies.

scholarly journals TRANSIENTS AT CHANGING THE CONFIGURATION OF THE DISCHARGE CIRCUIT OF THE CAPACITOR OF SEMICONDUCTOR ELECTRICAL DISCHARGE INSTALLATIONS WITH AN ELECTRO-SPARK LOAD

2020 ◽  
Vol 2020 (2) ◽  
pp. 3-9
Author(s):  
N.I. Suprunovska ◽  
◽  
M.A. Shcherba ◽  
V.V. Mykhailenko ◽  
Yu.V. Peretyatko ◽  
...  
Keyword(s):  
Electrical Discharge ◽  
Discharge Circuit

Engagement of Oil Immersed Multi-Disc Clutches

1992 ◽  
Author(s):  
Bengt Jacobson
Keyword(s):  
Simple Model ◽  
Dry Friction ◽  
Friction Surface ◽  
Friction Torque ◽  
Oil Film ◽  
Return Spring ◽  
Simulation Results ◽  
Friction Surfaces

Abstract Oil immersed clutches are often treated without respect to the oil being present, i.e. the torque is assumed to be a pure dry friction torque, directly controlled by the actuating force. However, during the engagement this is sometimes not enough. The oil film acts in two ways: Firstly, the oil has to be squeezed out before dry friction can be developed. Secondly, before the friction surfaces have reached contact, the torque is viscous. This work proposes equations that take these phenomena into account. A simple model for the transition from viscous to dry friction is used. Compensation for grooves in the friction surface is made. Also the hydraulic actuating equipment (piston, return spring, orifice etc.) is modelled. Simulation results are verified by experiments.

Kinematics and Statics for Soft Continuum Manipulators With Heterogeneous Soft Materials

2016 ◽  
Author(s):  
Fei Jiang ◽  
Haijie Zhang ◽  
Jianguo Zhao
Keyword(s):  
Degrees Of Freedom ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Soft Materials ◽  
Initial Study ◽  
Cylindrical Shape ◽  
Continuum Manipulators ◽  
Static Modeling ◽  
Simulation Results ◽  
Three Dimensional Space

Continuum manipulators are continuously bending robots with unlimited number of kinematic degrees of freedom. Most existing continuum manipulators have a central strut made of a single elastic material, and multiple cables placed around the strut are employed to actuate the manipulator. The kinematics for such robots has been extensively studied by assuming the manipulator has a circular shape. In this paper, we aim to investigate the kinematic and static modeling for novel soft continuum manipulators fabricated by multi-material 3D printing with heterogeneous soft materials. We model cylindrical shape manipulators consisting of three sections with three different materials, and they are actuated by three independent cables placed symmetrically. By pulling the cables with different displacements, the manipulators can be bent in three-dimensional space. As our initial study, we employ a single cable for all prototypes. Experimental results are compared with the simulation results to validate the proposed modeling method.

scholarly journals Shaping Soft Robotic Microactuators by Wire Electrical Discharge Grinding

Micromachines ◽  
2020 ◽  
Vol 11 (7) ◽  
pp. 661
Author(s):  
Edoardo Milana ◽  
Mattia Bellotti ◽  
Benjamin Gorissen ◽  
Jun Qian ◽  
Michaël De Volder ◽  
...  
Keyword(s):  
Electrical Discharge ◽  
Maximum Pressure ◽  
Cylindrical Shape ◽  
Mould Insert ◽  
Complex Deformation ◽  
Crucial Feature ◽  
Highly Sensitive ◽  
Mould Cavity ◽  
Deformation Patterns ◽  
Low Complex

Inflatable soft microactuators typically consist of an elastic material with an internal void that can be inflated to generate a deformation. A crucial feature of these actuators is the shape of ther inflatable void as it determines the bending motion. Due to fabrication limitations, low complex void geometries are the de facto standard, severely restricting attainable motions. This paper introduces wire electrical discharge grinding (WEDG) for shaping the inflatable void, increasing their complexity. This approach enables the creation of new deformation patterns and functionalities. The WEDG process is used to create various moulds to cast rubber microactuators. These microactuators are fabricated through a bonding-free micromoulding process, which is highly sensitive to the accuracy of the mould. The mould cavity (outside of the actuator) is defined by micromilling, whereas the mould insert (inner cavity of the actuator) is defined by WEDG. The deformation patterns are evaluated with a multi-segment linear bending model. The produced microactuators are also characterised and compared with respect to the morphology of the inner cavity. All microactuators have a cylindrical shape with a length of 8 mm and a diameter of 0.8 mm. Actuation tests at a maximum pressure of 50 kPa indicate that complex deformation patterns such as curling, differential bending or multi-points bending can be achieved.

scholarly journals Numerical effectiveness investigation of the automatic ball balancer with a deep chamber

2021 ◽  
Author(s):  
Sebastian Pakuła
Keyword(s):  
Mathematical Model ◽  
Body Movement ◽  
Single Layer ◽  
Rolling Resistance ◽  
Integration Time ◽  
Cylindrical Shape ◽  
Time Step ◽  
Friction Forces ◽  
Rotary Machine ◽  
Simulation Results

AbstractThe article describes the simulation results of an unbalanced rotary machine with an automatic ball balancer with a deep chamber (ABB-DC) based on a mathematical model of such a system. The ABB chamber has a cylindrical shape and is filled with balls that can move freely in general motion. The model takes into account mutual collisions between the balls, as well as between the balls and the chamber. The model also includes friction forces and rolling resistance. The comparison of simulation results performed with two different construction types of the chamber, classic single-layer drum (ABB-SC) and ABB-DC, confirmed the better efficiency of the ABB-DC in the optimal range of the number of balls. The machine body movement was limited to planar motion. The correctness of such a limitation has been verified by analyzing waveforms of reaction forces of constraints and their moments. Waveforms were divided into transient and steady states. The results of the analysis indicate the additional constraints do not significantly affect machine body movements. However, this might affect the ball arranging process in the ABB chamber. The paper also presents details of performing numerical simulations based on the developed mathematical model and numerical tests to determine the optimal integration time-step.

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