Study on the Cathodic Surface Micro-Profile Effects on the Current Filed Distribution in Processing of Electrochemical Finishing

2012 ◽  
Vol 522 ◽  
pp. 36-40
Author(s):  
Masikuda Abulihazi ◽  
Adayi Xieeryazidan
Keyword(s):  
Mathematical Model ◽  
Numerical Calculation ◽  
Current Distribution ◽  
Cathode Surface ◽  
Surface Profile ◽  
Current Field ◽  
Electrochemical Finishing ◽  
The Mathematical Model ◽  
Cathodic Surface ◽  
Leveling Effect

To improve the ECF leveling effect, according to the actual work of anodic and cathode surface micro-profile, based on the electrodynamics knowledge, established the mathematical model of current field. On the basis of this use of some software to simulate and proceeded numerical calculation, obtained for the influence rule the different cathode surface profile of the current field distribution, and was verified by the experiment. The experimental results show that the variation of the cathode surface micro-profile by changing the current distribution to affect the surface of the anodic and influence of leveling effect by copying the phenomenon will be its own surface profile is copied to the anode. The cathode surface profile is more pointed the affect for the anodic surface will be more obvious.

Modeling and Simulation of the Propagation Characteristics by Underground Current Field

2013 ◽  
Vol 385-386 ◽  
pp. 1568-1571
Author(s):  
Yi Dong Xu
Keyword(s):  
Mathematical Model ◽  
Signal Transmission ◽  
Signal Propagation ◽  
Underground Mines ◽  
Constant Current ◽  
Propagation Characteristics ◽  
Current Field ◽  
Channel Characteristics ◽  
Underground Communication ◽  
The Mathematical Model

It's one of the effective channels for short-distance wireless communications through stratum in underground mines on emergency communications. The geologic structure is complex in mines, in practical environments. It means there is a considerable difference in conductance property and channel characteristics. In order to realize effective communication through stratum, its necessary to explore and study underground signal transmission by establishing mathematical model of underground signal propagation characteristics based on the theory of constant current field and simulating the mathematical model with MATLAB. We established a simulation model of underground communication channel physics experiments and obtained the amplitude frequency characteristic of the channel, with which we can get the error comparison between theory and test.

On Influence of Change in Anodic Surface Micro-Topography on Electric Current Field in Electrochemical Finishing

2012 ◽  
Vol 503-504 ◽  
pp. 1002-1005
Author(s):  
Adayi Xieeryazidan ◽  
Amina Kader
Keyword(s):  
Mathematical Model ◽  
Electric Current ◽  
Distribution Density ◽  
Electrochemical Dissolution ◽  
Current Field ◽  
Electrochemical Finishing ◽  
Micro Topography

In processing of electrochemical finishing (ECF), electrochemical dissolution makes anodic surface micro-topography change. To identify the influence of the change on the distribution of electric-current field between electrodes, mathematical model describing the distribution of the electric-current field along the profile of the anodic surface micro-topography was established. The results of simulations and experiments show that the variation in the anodic surface micro-topography makes the distribution density of the electric-current uniform, and the sharp or peak-like micro-topography is in favour of improving the finishing ability of ECF.

The mathematical model and numerical calculation method of efflorescence

2018 ◽  
Vol 19 (5) ◽  
pp. 1428-1435
Author(s):  
Chunxiang Qian ◽  
Jian Wang ◽  
Tianji Cao ◽  
Jun Qu ◽  
Jingqiang Guo
Keyword(s):  
Mathematical Model ◽  
Numerical Calculation ◽  
Calculation Method ◽  
Numerical Calculation Method ◽  
The Mathematical Model

scholarly journals Reenactment of a bollard pull test for a double propeller tugboat using computational fluid dynamics

2015 ◽  
Vol 8 (17) ◽  
pp. 9
Author(s):  
Adan Vega ◽  
David López Martínez
Keyword(s):  
Fluid Dynamics ◽  
Mathematical Model ◽  
Computational Fluid Dynamics ◽  
Numerical Calculation ◽  
Cfd Simulations ◽  
The Real ◽  
Pull Test ◽  
Pull Tests ◽  
The Mathematical Model ◽  
Real Test

Use of CFD simulations is an affordable and trustworthy way of determining a vessel’s capacity before its construction. This study focuses in simulating a bollard pull of a specific tugboat and comparing the results with those of the real test to which it was subjected after construction. In compliance with the regulations of the classification societies regarding these types of tests, simulations will be carried out to study the bollard pull tests of a double propeller two boat. The results showed that the mathematical model is suitable for a numerical calculation of the bollard pull tests.

Modeling and Experiment of Anodic Smoothening in Electrochemical Finishing Based on Lateral Direction Dissolution

2008 ◽  
Vol 53-54 ◽  
pp. 21-26
Author(s):  
Gui Bing Pang ◽  
Xieeryazidan Adayi ◽  
Ning Ma ◽  
Wen Ji Xu ◽  
Jin Jin Zhou
Keyword(s):  
Mathematical Model ◽  
Wave Length ◽  
Normal Direction ◽  
Lateral Direction ◽  
Model Based ◽  
Surface Microtopography ◽  
Electrochemical Finishing ◽  
The Mathematical Model

From the viewpoint of the change of the anodic surface microtopography in the process of Electrochemical Finishing (ECF), this paper studies the anodic smoothening mechanism of ECF and puts forward the directional issue of the dissolution of anodic surface in the microtopography sense. On condition that the anodic material is dissolved along with the normal direction of the micro-profile on the anodic surface, the influence of wave length of the micro-profile on the smoothening effect is discussed in detail and the mathematical model based on the “lateral direction dissolution” is established. Finally, ECP is taken as the example and the experiment is carried out, the result shows that the smoothening rule obtained by experiment accords with that by calculation.

scholarly journals Experimental study and numerical calculation of the processes of complex elastoplastic deformation of materials along some multi-link strain paths

2020 ◽  
pp. 64-71
Author(s):  
Андрей Алексеевич Алексеев ◽  
Владимир Георгиевич Зубчанинов ◽  
Вадим Иванович Гультяев
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Experimental Study ◽  
Numerical Calculation ◽  
Elastoplastic Deformation ◽  
Numerical Calculations ◽  
Strain Paths ◽  
The Mathematical Model

Представлена верификация математической модели теории процессов путем сравнения численных расчетов с экспериментальными данными при сложном упругопластическом деформирования стали 45 по некоторым многозвенным ломаным траекториям. The verification of the mathematical model of the theory of processes by comparing numerical calculations with experimental data for complex elastoplastic deformation of steel 45 along some multi-link broken paths is presented.

DETERMINATION OF PERFORMANCE INDICATORS OF THE TRUCK KrAZ-6510TE

2020 ◽  
pp. 19-26
Author(s):  
Olexandr Pavlenko ◽  
Serhii Dun ◽  
Maksym Skliar
Keyword(s):  
Mathematical Model ◽  
Surface Friction ◽  
Building Structures ◽  
Maximum Torque ◽  
Military Equipment ◽  
Military Vehicles ◽  
Force Magnitude ◽  
Vehicle Mobility ◽  
The Mathematical Model

In any economy there is a need for the bulky goods transportation which cannot be divided into smaller parts. Such cargoes include building structures, elements of industrial equipment, tracked or wheeled construction and agricultural machinery, heavy armored military vehicles. In any case, tractor-semitrailer should provide fast delivery of goods with minimal fuel consumption. In order to guarantee the goods delivery, tractor-semitrailers must be able to overcome the existing roads broken grade and be capable to tow a semi-trailer in off-road conditions. These properties are especially important for military equipment transportation. The important factor that determines a tractor-semitrailer mobility is its gradeability. The purpose of this work is to improve a tractor-semitrailer mobility with tractor units manufactured at PJSC “AutoKrAZ” by increasing the tractor-semitrailer gradeability. The customer requirements for a new tractor are determined by the maximizing the grade to 18°. The analysis of the characteristics of modern tractor-semitrailers for heavy haulage has shown that the highest rate of this grade is 16.7°. The factors determining the limiting gradeability value were analyzed, based on the tractor-semitrailer with a KrAZ-6510TE tractor and a semi-trailer with a full weight of 80 t. It has been developed a mathematical model to investigate the tractor and semi-trailer axles vertical reactions distribution on the tractor-semitrailer friction performances. The mathematical model has allowed to calculate the gradeability value that the tractor-semitrailer can overcome in case of wheels and road surface friction value and the tractive force magnitude from the engine. The mathematical model adequacy was confirmed by comparing the calculations results with the data of factory tests. The analysis showed that on a dry road the KrAZ-6510TE tractor with a 80 t gross weight semitrailer is capable to climb a gradient of 14,35 ° with its coupling mass full use condition. The engine's maximum torque allows the tractor-semitrailer to overcome a gradient of 10.45° It has been determined the ways to improve the design of the KrAZ-6510TE tractor to increase its gradeability. Keywords: tractor, tractor-semitrailer vehicle mobility, tractor-semitrailer vehicle gradeability.

EXPERIMENTAL STUDIES OF CAR PROPERTIES ON A PHYSICAL MODEL

2019 ◽  
pp. 10-16
Author(s):  
Oleksii Timkov ◽  
Dmytro Yashchenko ◽  
Volodymyr Bosenko
Keyword(s):  
Mathematical Model ◽  
Remote Control ◽  
Physical Model ◽  
Model Experiment ◽  
Experimental Studies ◽  
Electrical Energy ◽  
Short Term ◽  
Motor Current ◽  
Memory Card ◽  
The Mathematical Model

The article deals with the development of a physical model of a car equipped with measuring, recording and remote control equipment for experimental study of car properties. A detailed description of the design of the physical model and of the electronic modules used is given, links to application libraries and the code of the first part of the program for remote control of the model are given. Atmega microcontroller on the Arduino Uno platform was used to manage the model and register the parameters. When moving the car on the memory card saved such parameters as speed, voltage on the motor, current on the motor, the angle of the steered wheel, acceleration along three coordinate axes are recorded. Use of more powerful microcontrollers will allow to expand the list of the registered parameters of movement of the car. It is possible to measure the forces acting on the elements of the car and other parameters. In the future, it is planned to develop a mathematical model of motion of the car and check its adequacy in conducting experimental studies on maneuverability on the physical model. In addition, it is possible to conduct studies of stability and consumption of electrical energy. The physical model allows to quickly change geometric dimensions and mass parameters. In the study of highway trains, this approach will allow to investigate the various layout schemes of highway trains in the short term. It is possible to make two-axle road trains and saddle towed trains, three-way hitched trains of different layout. The results obtained will allow us to improve not only the mathematical model, but also the experimental physical model, and move on to further study the properties of hybrid road trains with an active trailer link. This approach allows to reduce material and time costs when researching the properties of cars and road trains. Keywords: car, physical model, experiment, road trains, sensor, remote control, maneuverability, stability.

RESEARCH OF INDICATORS OF A VEHICLE WITH A DIESEL WORKING ON DIESEL AND DIESEL GAS CYCLES USING THE MATHEMATICAL MODEL

2020 ◽  
pp. 14-19
Author(s):  
Serhii Kovbasenko ◽  
Andriy Holyk ◽  
Serhii Hutarevych
Keyword(s):  
Mathematical Model ◽  
Diesel Engine ◽  
Environmental Performance ◽  
Energy Performance ◽  
Dual Fuel ◽  
Fuel System ◽  
Compressed Natural Gas ◽  
Diesel Vehicles ◽  
Diesel Cycle ◽  
The Mathematical Model

The features of an advanced mathematical model of motion of a truck with a diesel engine operating on the diesel and diesel gas cycles are presented in the article. As a result of calculations using the mathematical model, a decrease in total mass emissions as a result of carbon monoxide emissions is observed due to a decrease in emissions of nitrogen oxides and emissions of soot in the diesel gas cycle compared to the diesel cycle. The mathematical model of a motion of a truck on a city driving cycle according to GOST 20306-90 allows to study the fuel-economic, environmental and energy indicators of a diesel and diesel gas vehicle. The results of the calculations on the mathematical model will make it possible to conclude on the feasibility of converting diesel vehicles to using compressed natural gas. Object of the study – the fuel-economic, environmental and energy performance diesel engine that runs on dual fuel system using CNG. Purpose of the study – study of changes in fuel, economic, environmental and energy performance of vehicles with diesel engines operating on diesel and diesel gas cycles, according to urban driving cycle modes. Method of the study – calculations on a mathematical model and comparison of results with road tests. Bench and road tests, results of calculations on the mathematical model of motion of a truck with diesel, working on diesel and diesel gas cycles, show the improvement of environmental performance of diesel vehicles during the converting to compressed natural gas in operation. Improvement of environmental performance is obtained mainly through the reduction of soot emissions and nitrogen oxides emissions from diesel gas cycle operations compared to diesel cycle operations. The results of the article can be used to further develop dual fuel system using CNG. Keywords: diesel engine, diesel gas engine, CNG

Glycemia monitoring

1998 ◽  
Vol 2 ◽  
pp. 23-30
Author(s):  
Igor Basov ◽  
Donatas Švitra
Keyword(s):  
Diabetes Mellitus ◽  
Mathematical Model ◽  
Numerical Methods ◽  
Differential Equations ◽  
Blood Sugar ◽  
Self Regulation ◽  
Physiological System ◽  
Non Linear ◽  
The Mathematical Model

Here a system of two non-linear difference-differential equations, which is mathematical model of self-regulation of the sugar level in blood, is investigated. The analysis carried out by qualitative and numerical methods allows us to conclude that the mathematical model explains the functioning of the physiological system "insulin-blood sugar" in both normal and pathological cases, i.e. diabetes mellitus and hyperinsulinism.

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