Experimental Studies of the Physical Model of the Milling-Rotary Snow Cleaner

2021 ◽  
Vol 15 (9) ◽  
pp. 453
Author(s):  
Mikhail Doudkin ◽  
Alina Kim ◽  
Bekbolat Moldakhanov ◽  
Gennady Kustarev ◽  
Nikita Andryukhov ◽  
...  
Keyword(s):  
Physical Model ◽  
Experimental Studies

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.

scholarly journals DEVELOPMENT OF PHYSICAL MODEL VEHICLE WITH REMOTIONAL CONTROL FOR EXPERIMENTAL STUDIES OF VEHICLE PROPERTIES

2020 ◽  
Vol 1 (46) ◽  
pp. 341-352
Author(s):  
Timkov O ◽  
◽  
Yashchenko D ◽  
Keyword(s):  
Mathematical Model ◽  
Experimental Study ◽  
Remote Control ◽  
Physical Model ◽  
Large Scale ◽  
Experimental Studies ◽  
Scale Model ◽  
Recording Equipment ◽  
Control Equipment ◽  
The Future

The article is devoted to the development of the physical model of the vehicle, the equipment of the measuring, recording and remote control equipment for the experimental study of the properties vehicles. The construction of the physical model and the used electronic modules is described in detail, references are given to the application libraries and the code of the first part of the program for remote control. In the future, it is planned to develop a mathematical model of the movement of a passenger vehicle and to check its adequacy in conducting experimental studies on maneuverability on a physical model. The aim of the article is developed the physical model of the vehicle, equipped with measuring, recording and remote control equipment, for the experimental study of the properties of vehicle. Materials and research methods: development and designing (experimental research of properties of vehicles on the physical model); remote control; wheeled controlled module. The self-propelled large-scale model of the vehicle, reproducing a passenger car of the category M1, with a controlled wheelbase and a rear drive axle, has been developed. The model is equipped with the necessary measuring and recording equipment and remote control equipment. The software of the model allows you to implement both control manual and the given algorithm. In the future, it is planned to develop a mathematical model of the vehicle motion and to check its adequacy on the developed physical model. The obtained results will allow to improve not only the mathematical model, but also the experimental physical model and proceed further to the study of the properties of hybrid road trains with an active trailer link. KEY WORDS: VEHICLE, PHYSICAL MODEL, EXPERIMENT, STUDY, MODULE, MEMORY CARD, ACCELEROMETER, PROGRAM.

scholarly journals Fractal theory of non-Newtonian oil viscosity based on the mutual interaction of colloidal particles: a review and new results

2021 ◽  
pp. 26-46
Author(s):  
V.I. Lesin
Keyword(s):  
Shear Rate ◽  
Physical Model ◽  
Colloidal Particles ◽  
Fractal Structure ◽  
Fractal Theory ◽  
Experimental Studies ◽  
Oil Viscosity ◽  
Shear Rates ◽  
Model Sample ◽  
Individual Particles

To describe the viscosity of oil, the author proposed a theory based on a new physical model, which takes into account the interaction of individual colloidal particles and their aggregates of fractal structure. This process is accompanied by the addition of individual particles to aggregates and by their separation under the action of shear stress, which is reflected in the energy consumption of the fluid movement and manifests itself as a dependence of the viscosity on the shear rate. The purpose of the review is to demonstrate the application of fractal viscosity theory to interpret the results of known experimental studies. The review also contains the results of new experimental studies of a model sample of oil to illustrate a number of statements of the theory. The detailed parameters of the physical model are specified, on the basis of which a fractal theory of viscosity is proposed; a system of two equations is obtained that allows to describe the dependence of viscosity on the shear rate and time. It is demonstrated that the conclusions drawn from the theory correspond to the known and newly obtained experimental data. The regularities of viscosity relaxation predicted experimentally by the theory with increasing and decreasing shear rates are confirmed. A methodology based on the laws of thermodynamics is proposed that allows to select the mode of shear rate action on heavy oil to reduce its viscosity.

scholarly journals Thrusters Physical Model Formalization With Regard to Situational and Identification Factors of Motion Modes

2020 ◽  
Vol 14 ◽  
Keyword(s):  
Mathematical Models ◽  
Physical Model ◽  
Power Plants ◽  
Experimental Studies ◽  
Dynamic Positioning ◽  
Computational Hydrodynamics ◽  
Flow Lines ◽  
Factors Influencing ◽  
Input And Output ◽  
Motion Modes

Within the framework of the research of diagnos-tics and prediction of technical state of ship power plants (SPP) of combined propulsion complexes (CPC) depend-ences of correcting factors influencing components of thrusts and moments, proportional dimensions of model and real thrusts (THRs), tied to the original geometry were obtained. This was done by formalizing the physical model of the azimuth thruster with the means of identifying the degradation effects on the flow lines of the propellers by methods of computational hydrodynamics. The technique of improving the structure of the mathematical models of the SPP CPC according to experimental studies by measur-ing the input and output parametric coordinates of the THRs CPC of a vessel operating in the dynamic positioning mode is announced.

scholarly journals Modeling of Surface Geometric Structure State After Integratedformed Milling and Finish Burnishing

2017 ◽  
Vol 25 (2) ◽  
pp. 131-136 ◽  
Author(s):  
Stefan Berczyński ◽  
Daniel Grochała ◽  
Zenon Grządziel
Keyword(s):  
Physical Model ◽  
Contact Zone ◽  
Experimental Studies ◽  
Element Model ◽  
Surface Plastic ◽  
Plastic Deformations ◽  
Mean Values ◽  
Milled Surface ◽  
Structure State ◽  
Burnishing Process

Abstract The article deals with computer-based modeling of burnishing a surface previously milled with a spherical cutter. This method of milling leaves traces, mainly asperities caused by the cutting crossfeed and cutter diameter. The burnishing process - surface plastic treatment - is accompanied by phenomena that take place right in the burnishing ball-milled surface contact zone. The authors present the method for preparing a finite element model and the methodology of tests for the assessment of height parameters of a surface geometrical structure (SGS). In the physical model the workpieces had a cuboidal shape and these dimensions: (width × height × length) 2×1×4.5 mm. As in the process of burnishing a cuboidal workpiece is affected by plastic deformations, the nonlinearities of the milled item were taken into account. The physical model of the process assumed that the burnishing ball would be rolled perpendicularly to milling cutter linear traces. The model tests included the application of three different burnishing forces: 250 N, 500 N and 1000 N. The process modeling featured the contact and pressing of a ball into the workpiece surface till the desired force was attained, then the burnishing ball was rolled along the surface section of 2 mm, and the burnishing force was gradually reduced till the ball left the contact zone. While rolling, the burnishing ball turned by a 23° angle. The cumulative diagrams depict plastic deformations of the modeled surfaces after milling and burnishing with defined force values. The roughness of idealized milled surface was calculated for the physical model under consideration, i.e. in an elementary section between profile peaks spaced at intervals of crossfeed passes, where the milling feed fwm = 0.5 mm. Also, asperities after burnishing were calculated for the same section. The differences of the obtained values fall below 20% of mean values recorded during empirical experiments. The adopted simplification in after-milling SGS modeling enables substantial acceleration of the computing process. There is a visible reduction of the Ra parameter value for milled and burnished surfaces as the burnishing force rises. The tests determined an optimal burnishing force at a level of 500 N (lowest Ra = 0.24 μm). Further increase in the value of burnishing force turned out not to affect the surface roughness, which is consistent with the results obtained from experimental studies.

Experimental studies with power system stabilizers on a physical model of a multimachine power system

1996 ◽  
Vol 11 (2) ◽  
pp. 807-812 ◽  
Author(s):  
O.P. Malik ◽  
V.A. Stroev ◽  
V.A. Shtrobel ◽  
G.C. Hancock ◽  
R.S. Beim
Keyword(s):  
Power System ◽  
Physical Model ◽  
Experimental Studies ◽  
Power System Stabilizers

scholarly journals Modelling the flight dynamics of aerial target imitator

2018 ◽  
Vol 48 (1) ◽  
pp. 119-147
Author(s):  
Roman Kamiński ◽  
Marian Tybura ◽  
Zygmunt Winczura ◽  
Andrzej Żyluk
Keyword(s):  
Physical Model ◽  
Dynamic Characteristics ◽  
Dynamic Properties ◽  
Experimental Studies ◽  
Flight Dynamics ◽  
Theoretical Studies ◽  
Simulation Studies ◽  
Technical Data ◽  
Basic Parameters ◽  
Experimental And Theoretical Studies

Abstract This article is concerned with the issue related to studying the dynamic properties of the aerial target imitator. Applying the modelling principles, the structure and technical data of aerial target imitator were described and utilising the PRODAS software a physical model of the aerial imitator was developed based on the conducted simulation studies. Mass, aerodynamic and basic parameters of flight path were determined. Then, experimental studies of basic dynamic characteristics were discussed. The comparison of results obtained from experimental and theoretical studies proves the correctness of the developed model.

Design and laboratory verification of a physical model of sloping capillary barrier

2004 ◽  
Vol 41 (5) ◽  
pp. 814-830 ◽  
Author(s):  
Denny Tami ◽  
Harianto Rahardjo ◽  
Eng-Choon Leong ◽  
Delwyn G Fredlund
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Numerical Analysis ◽  
Physical Model ◽  
Water Pressure ◽  
Experimental Studies ◽  
Silty Sand ◽  
Capillary Barrier ◽  
Simulation Results ◽  
Barrier Model

A physical model was designed and constructed to study the mechanisms associated with capillary barriers for slope stabilization purposes. Prior to construction of the model, various numerical analyses were conducted to determine the optimum dimensions and appropriate soil types for the materials of the capillary barrier model. This paper is divided into three sections: the first two sections are related to the design of the model and are to obtain the optimum dimensions of the model and to investigate the range of soil properties that are most suitable for experimental studies in the laboratory; and the last section is laboratory verification of the numerical analysis where the numerical simulation results are compared with the experimental data. Based on the numerical simulation results, the physical capillary barrier model was constructed using two different combinations of soils, namely silty sand over gravelly sand and fine sand over gravelly sand. From the comparison of the numerical results and experimental data, it was found that the numerical analysis was able to simulate the experiment on the physical capillary barrier model reasonably well.Key words: physical capillary barrier model, unsaturated water flow, numerical simulation, pore-water pressure, volumetric water content, slope stability, infiltration.

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