scholarly journals MATHEMATICAL SIMULATION OF MOVEMENT ON A DEFORMED SUPPORTING SURFACE WITH CHANGE OF TIRE PRESSURE IN WHEEL TIRES OF A MULTI-PURPOSE ARMORED VEHICLE IN THE EXAMPLE OF KrAZ �HURRICANE�

2021 ◽  
Vol 1 (37) ◽  
pp. 78-88
Author(s):  
�. Sklyarov ◽  
◽  
O. Shapovalov ◽  
Keyword(s):  
Mathematical Model ◽  
Specific Energy ◽  
Air Pressure ◽  
Energy Losses ◽  
Mathematical Apparatus ◽  
Damping Properties ◽  
Engine Torque ◽  
Fuel Supply ◽  
The Road ◽  
Armored Vehicle

Mathematical modeling of the movement of multi-purpose armored vehicles for military purposes has significant features in contrast to the modeling of the movement of civilian vehicles. Because the operation of military equipment provides the ability to move not only on general roads, but also outside them. With different coefficients of adhesion of wheels to the road and coefficients of rolling resistance on the road. Therefore, to improve driving conditions and increase cross-country, it is advisable to carry out the optimal redistribution of air pressure in the tires. The efficiency of motion in such conditions must be theoretically investigated using a modern mathematical apparatus. That will allow providing for multipurpose motor vehicles effective performance of the set level of tasks in the specified operating conditions and at a certain ratio of its technical characteristics to provide the maximum degree of performance of technical requirements. The purpose of the article is to create a mathematical apparatus for regulating the air pressure between the axles of an armored vehicle with a wheel formula 8 ? 8, when moving on surfaces with variable coefficients of traction and wheel resistance, to increase the passability of a multi-purpose armored vehicle. The basis of the mathematical model of rectilinear motion of a multi-purpose armored vehicle on a deformed support surface and the determination of the characteristics of this movement (indicators of reference passability) is the modeling of the car movement proposed by the authors in the works. When developing a mathematical model of the movement of a multi-purpose armored vehicle on a deformed bearing surface, it is necessary to develop a calculation scheme in which the assumptions are made: ? the rectilinear movement of the multipurpose armored car on an equal basic basis is considered; ? left and starboard conditions are the same; ? wheel tracks of all bridges (axes) on the sides of the car completely coincide; ? the characteristics of the ground surface on the sides of the car are the same; ? the connection of the wheels with the car body in the vertical plane is rigid (without taking into account the elastic properties of the suspension); ? the longitudinal flexibility of the suspension guide elements is taken into account; ? the engine torque affects the wheel directly; ? elastic - damping properties of transmission elements are not taken into account; ? soil deformation is specified not because of its direct physical characteristics, but as specific energy losses during wheel rolling on a flat surface ? the longitudinal pliability of the guide elements of the suspension is taken into account; ? engine torque directly affects the wheel; ? elastic-damping properties of transmission elements are not taken into account; ? deformation of the soil is set not because of its direct physical characteristics, but as specific energy losses when rolling the wheel on a flat basis; ? engine response to a change in the position of the fuel supply body without delay; ? characteristic of the torque developed by the engine, taken in the form of an inclined line, the maximum value of which is determined by the fractions of the change in the position of the fuel supply body.

An Automatic Collision Avoidance System Based on LiDAR

2014 ◽  
Vol 644-650 ◽  
pp. 952-956 ◽  
Author(s):  
Hao Yang ◽  
An Qing You ◽  
Wen Wu Pan ◽  
Hai Long Tang
Keyword(s):  
Mathematical Model ◽  
Collision Avoidance ◽  
Point Cloud ◽  
Gps Data ◽  
3D Point Cloud ◽  
The Road ◽  
3D Engine ◽  
Collision Avoidance System

For vehicle-borne LiDAR, a mathematical model is built for the computation and reconstruction of laser point cloud with the scanning data, GPS data and IMU data. 3D point cloud of the road and the scenery on the both sides of the road is obtained. Then according to the trajectory of the vehicle, 3D roaming for the scenery on the both sides of the road is realized using OpenGL 3D engine technology. This technology provides a probably feasible way for anti-collision of vehicles and aircrafts when driven at night, in the heavy fog or flying between the mountains.

Assessment of roadability and stability of a vehicle movement on the bend

2020 ◽  
Keyword(s):  
Mathematical Model ◽  
Road Surface ◽  
Inertia Force ◽  
Speed Limit ◽  
The Road ◽  
Inertial Moment ◽  
The Mathematical Model ◽  
Computer Imitation ◽  
Vehicle Movement

The paper presents the mathematical model and the technique of computer imitation of a vehicle movement on bend. Research of roadability and stability of the truck and the schedules illustrating change of characteristics of the steered movement have been obtained. The critical modes of the movement causing separation of wheels from road surface and side slippage have been defined. Speed limit of the steered movement on trajectory of the set curvature have been determined. Keywords vehicle, wheel, cross and longitudinal reactions of the road, inertia force, inertial moment, trajectory of a vehicle movement, angles of withdrawal of wheels, spring weight angle of heel, side slippage, vehicle drift

Analytical Study of Hydro-Pneumatic Processes for Gorlov's Power System

1994 ◽  
Vol 208 (1) ◽  
pp. 67-70
Author(s):  
A I Ryazanov
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Power System ◽  
Analytical Study ◽  
Model Tests ◽  
Air Pressure ◽  
Pneumatic Power ◽  
Time Required ◽  
The Mathematical Model

This paper describes the aerohydrodvnamics of processes in chambers of Gorlov's hydro-pneumatic power system. The mathematical model is developed to determine the main parameters of the processes: water and air velocities, air pressure in the chamber, the periods of time required to fill and empty the chambers and the output of energy during the cycle. The results obtained are in agreement with experimental data and model tests.

scholarly journals FULL CAR ACTIVE DAMPING SYSTEM FOR VIBRATION CONTROL

2020 ◽  
Vol 6 (4) ◽  
pp. 1-17
Author(s):  
G. Yakubu ◽  
G. Sani ◽  
S. B. Abdulkadir ◽  
A. A.Jimoh ◽  
M. Francis
Keyword(s):  
Mathematical Model ◽  
Linear Quadratic Regulator ◽  
Active Damping ◽  
Settling Time ◽  
Linear Quadratic ◽  
Body Acceleration ◽  
The Road ◽  
Road Profile ◽  
Lqr Controller ◽  
Mass Displacement

Full car passive and active damping system mathematical model was developed. Computer simulation using MATLAB was performed and analyzed. Two different road profile were used to check the performance of the passive and active damping using Linear Quadratic Regulator controller (LQR)Road profile 1 has three bumps with amplitude of 0.05m, 0.025 m and 0.05 m. Road profile 2 has a bump with amplitude of 0.05 m and a hole of -0.025 m. For all the road profiles, there were 100% amplitude reduction in Wheel displacement, Wheel deflection, Suspension travel and body displacement, and 97.5% amplitude reduction in body acceleration for active damping with LQR controller as compared to the road profile and 54.0% amplitude reduction in body acceleration as compared to the passive damping system. For the two road profiles, the settling time for all the observed parameters was less than two (2) seconds. The present work gave faster settling time for mass displacement, body acceleration and wheel displacement.

scholarly journals Integration of Transport-relevant Data within Image Record of the Surveillance System

2016 ◽  
Vol 28 (5) ◽  
pp. 517-527
Author(s):  
Adam Stančić ◽  
Ivan Grgurević ◽  
Zvonko Kavran
Keyword(s):  
Mathematical Model ◽  
Data Processing ◽  
Discrete Cosine Transform ◽  
Programming Language ◽  
Surveillance System ◽  
Basic Assumption ◽  
Review Paper ◽  
Relevant Information ◽  
The Road ◽  
On The Road

Integration of the collected information on the road within the image recorded by the surveillance system forms a unified source of transport-relevant data about the supervised situation. The basic assumption is that the procedure of integration changes the image to the extent that is invisible to the human eye, and the integrated data keep identical content. This assumption has been proven by studying the statistical properties of the image and integrated data using mathematical model modelled in the programming language Python using the combinations of the functions of additional libraries (OpenCV, NumPy, SciPy and Matplotlib). The model has been used to compare the input methods of meta-data and methods of steganographic integration by correcting the coefficients of Discrete Cosine Transform JPEG compressed image. For the procedures of steganographic data processing the steganographic algorithm F5 was used. The review paper analyses the advantages and drawbacks of the integration methods and present the examples of situations in traffic in which the formed unified sources of transport-relevant information could be used.

scholarly journals RTA Mathematic Simulation Principles at the Autotechnical Expertise

2021 ◽  
Vol 334 ◽  
pp. 02026
Author(s):  
Badrudin Gasanov ◽  
Artem Efimov ◽  
Jurij Grebennikov
Keyword(s):  
Mathematical Model ◽  
Road Transport ◽  
Road Accident ◽  
Momentum Vector ◽  
The Road ◽  
Solid Friction ◽  
Strain Stress ◽  
Determination Methods ◽  
Determine Step ◽  
Energy Conservation Law

The features of carrying out an autotechnical expertise (ATE) are considered in case the vehicles (V) participating in the road transport accident (RTA) don’t leave skid imprints. The examples of momentum and energy conservation law application are given at developing the road accident mathematical model. Special attention is paid to the determination methods of vehicle (V) velocity, travel directions in various RTA diagrams and archeology of deformation. For this purpose it is offered to draw a momentum vector diagram. It is reasonable that for the calculation of V deformation at RTA it is necessary to determine step by step the strain-stress state in a contact area on the basis of the theories of elasticity, plasticity, solid friction and finite-element methods. The technique of constructing an RTA mathematical model is developed. It is recommended to use at ATE of RTAs at the runs-over into the fixed obstacle (a stationary V) and collisions.

Second Paper: Some Aspects of the Design and Operation of the Three-Wheeled Road Roller

1966 ◽  
Vol 181 (1) ◽  
pp. 91-109
Author(s):  
F. H. Wass
Keyword(s):  
Torque Converter ◽  
Hydraulic Systems ◽  
Engine Torque ◽  
The Road ◽  
Additional Equipment ◽  
Recent Developments ◽  
Hydrostatic Transmissions ◽  
Hydrostatic System ◽  
Unit Output ◽  
Finishing Processes

Following an introduction of general historic nature dealing with the evolution of the modern road roller from the first practicable steam roller of 100 years ago, the paper is confined generally to an examination of the mechanical engineering content and operational requirements of this item of engineering plant universally employed in today's surface consolidation, compaction and finishing processes. The mechanical constitution of the road roller is examined with particular reference to recent developments in design concerning clutches, mechanical, hydrokinetic and hydrostatic transmissions, steering, brakes, bearings and hydraulic systems, all of which are in close accord with modern automotive design practice. Curves illustrate the basic co-ordination requirements of engine/torque converter combination, the torque converter and hydrostatic unit output performance characteristics and vehicle road performance (gradient/ mile/h) with the mechanical ‘stepped’ transmission, the overlapping torque converter transmission and infinite ratio ‘stepless’ hydrostatic system. Additional equipment fitted to the roller for performing operations other than surface rolling is also considered together with features designed to produce maximum operational efficiency. Modern design trends to satisfy present-day demands of maximum machine utilization with minimum servicing and maintenance ‘down-times’ are considered with particular reference to lubrication and accessibility for servicing. Conclusions to past and present are given in the author's views on probable future trends in design and construction.

ALGORITHMIC SUPPORT FOR SELECTING OPTIMAL TRAFFIC ROUTE OF MOTOR CONVOY OF RAPID REACTION BORDER COMMAND POST

2019 ◽  
pp. 25-35
Author(s):  
O. Borovyk ◽  
V. Kupelskiy
Keyword(s):  
Mathematical Model ◽  
Traffic Safety ◽  
The State ◽  
Optimal Route ◽  
The Road ◽  
Starting Point ◽  
Branching Points ◽  
The Matrix ◽  
The Status ◽  
Speed Function

The rapid response border commandant's office is a structural unit of the border detachment, designed to protect and strengthen the protection of a certain section of the state border, and must quickly redeploy its forces and assets. The success of the tasks assigned to the unit depends largely on the timeliness of arrival at the destination. Operational transportation of a significant amount of weapons, personnel and dissimilar cargoes on land is carried out using equipment. At the preparatory stage of the organization of transportation, the problem of forming the optimal composition of the convoy of equipment is solved. The existing road network provides a sufficiently large number of traffic routes between the starting and ending points. Moreover, this takes place even for insignificant distances between points of departure and destination. The specified conditions for multivariance in the selection. In addition, the choice of the route of movement depends on many auxiliary conditions: driver training, technical characteristics and reliability of vehicles, traffic safety, road and environmental conditions, distance and timing of transportation, and the like. Poor accounting of these factors in the aggregate may lead to the choice of an irrational route of movement, will not ensure the timely arrival of the unit at the destination, and may lead to the failure to fulfill certain tasks. Therefore, the task of choosing the optimal route of movement of the column of equipment is relevant. At the substantive level, the task looks like the justification of the mathematical model for choosing the optimal route for the column of equipment, if the criterion of optimality is minimizing the time it takes to move from the starting point to the destination. The authors formed a mathematical model of the given problem, proposed an algorithm for its solution for three cases: discrete-stochastic, discretely-determined and continuously-indefinite, and the corresponding software was developed. The choice of routes is carried out for three options, taking into account the fact that the change in the weights of the ribs can be carried out: at times when the column is at a certain vertex of the graph, and the update of the matrix of weights is carried out precisely at these moments. This is the case when a decision on the further route of movement is formed at the road branching points, taking into account the situation, the status of individual sections changes dynamically and data for which appears periodically; at times when the column is at a certain vertex of the graph, and for these moments, the matrix of weights that will occur when the column hits the vertex are known in advance. This is the case when a decision on the route of movement can be formed at the beginning of the movement, taking into account the known situation on the state of the roads, dynamically change, but data on which can be taken into account in advance; randomly depending on the speed of the column at a fixed point in time for which the column speed function is known.

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