scholarly journals Vehicle Speed Determination in Case of Road Accident by Software Method and Comparing of Results with the Mathematical Model

2017 ◽  
Vol 67 (2) ◽  
pp. 51-60
Author(s):  
Gezim Hoxha ◽  
Ahmet Shala ◽  
Rame Likaj
Keyword(s):  
Mathematical Model ◽  
Road Accident ◽  
Vehicle Speed ◽  
Front Part ◽  
Road Accidents ◽  
Calculation Methods ◽  
Mathematical Methods ◽  
Technical Feature ◽  
The Mathematical Model

AbstractThe paper addresses the problem to vehicle speed calculation at road accidents. To determine the speed are used the PC Crash software and Virtual Crash. With both methods are analysed concrete cases of road accidents. Calculation methods and comparing results are present for analyse. These methods consider several factors such are: the front part of the vehicle, the technical feature of the vehicle, car angle, remote relocation after the crash, road conditions etc. Expected results with PC Crash software and Virtual Crash are shown in tabular graphics and compared in mathematical methods.

scholarly journals Motion Simulation for Triangular-Shaped Autonomous Underwater Vehicle (TAUV) with Controllable Rudder

2021 ◽  
Vol 2107 (1) ◽  
pp. 012046
Author(s):  
I Y Amran ◽  
K Isa
Keyword(s):  
Mathematical Model ◽  
Autonomous Underwater Vehicle ◽  
Research Work ◽  
Underwater Vehicle ◽  
Open Loop ◽  
Vehicle Speed ◽  
Motion Simulation ◽  
Loop Control ◽  
Angular Velocities ◽  
The Mathematical Model

Abstract The dynamic model and motion simulation for a Triangular-Shaped Autonomous Underwater Vehicle (TAUV) with independently controlled rudders are described in this paper. The TAUV is designed for biofouling cleaning in aquaculture cage fishnet. It is buoyant underwater and moves by controlling two thrusters. Hence, in this research work, the authors designed a TAUV that is propelled by two thrusters and maneuvered by using an independently controllable rudder. This paper discussed the development of a mathematical model for the TAUV and its dynamic characteristics. The mathematical model was simulated by using Matlab and Simulink to analyze the TAUV’s motion based on open-loop control of different rudder angles. The position, linear and angular velocities, angle of attack, and underwater vehicle speed are all demonstrated in the findings.

Steering Strategy for a Multi-Axle Wheeled Vehicles

2018 ◽  
Author(s):  
Waqar Ahmed ◽  
Raja Amer Azim ◽  
Sana Fatima
Keyword(s):  
Mathematical Model ◽  
Single Unit ◽  
Steering System ◽  
Vehicle Speed ◽  
Wheel Slip ◽  
Turn Radius ◽  
Heavy Loads ◽  
The Mathematical Model ◽  
Wheeled Vehicles ◽  
Good Vehicle

This paper presents a mathematical model for multi-axle steering vehicles operating on level ground. For transporting heavy loads vehicles with multiple axles are required. Apart from added complexity steering of multiple axle for turning is a big challenge. Due to type of load being carried a single unit vehicle is sometimes preferred. The mathematical model of a six axle vehicle with 4-axle steering system is developed. Simulations at various track radii, vehicle speeds and steering ratios (ratio between the first, second, fifth and sixth steering axle) are performed. Axle steering angles and wheel slip angles are evaluated. The steering ratio requirements vary with vehicle speed and turn radius. A configuration is selected for better performance for a wider range. The resulting steering ratios show good vehicle maneuverability, stability and steering efficiency.

scholarly journals Mathematical model of a steam turbine condenser

2021 ◽  
Vol 80 (2) ◽  
pp. 41-46
Author(s):  
N. G. Borissova ◽  
◽  
M. D. Shavdinova ◽  
Keyword(s):  
Mathematical Model ◽  
Vapor Pressure ◽  
Steam Turbine ◽  
Flow Rate ◽  
Cooling Water ◽  
Calculation Methods ◽  
Turbine Condenser ◽  
Passport Data ◽  
Steam Turbine Condenser ◽  
The Mathematical Model

The paper analyses the existing calculation methods for steam turbine condenser. The refined methods for calculating the condenser have also been considered. The dependency of the vapor pressure in the condenser on the temperature of the cooling water and the steam flow rate into the condenser have been considered. It can be seen from the obtained dependencies that the calculation of the condenser according to the ARTI and HEI (USA) methods coincides with the passport data. It is recommended to use the ARTI and HEI (USA) techniques for equipment diagnostics, and to use the KTP and USTU-UPI techniques when studying ways to increase the efficiency of the condenser. The mathematical model of the KG2-6200 condenser has been tested at the Almaty СHPP-2.

scholarly journals ANALYSIS OF CALCULATION METHODS USED FOR ACCURACY EVALUATION OF THE RESULTS OF ROAD ACCIDENT EXAMINATION

Transport ◽  
2008 ◽  
Vol 23 (2) ◽  
pp. 156-160 ◽  
Author(s):  
Saulius Nagurnas ◽  
Valentinas Mickūnaitis ◽  
Robertas Pečeliūnas ◽  
Aurelijus Vestartas
Keyword(s):  
Road Accident ◽  
Accuracy Evaluation ◽  
Road Accidents ◽  
Mathematical Methods ◽  
Main Attention ◽  
Calculated Parameter ◽  
Braking Distance ◽  
Mathematical Equations ◽  
Methods Of Calculations

For examination of road accidents often calculations are being performed according to mathematical equations having many variables, real values of which are of stochastic nature and they depend on many accident factors. Therefore it is important to know limits of determination of final values of every being analysed parameter of car movement and their probabilistic characteristics. This paper presents some cases of simulation of some road situations by mathematical methods of calculations, which now are widely used for evaluation of accuracy of values of the calculated parameter (in this paper ‐ the braking distance). Also here is presented some analysis of these methods. The paper presents the following cases of car braking: braking with making attempts to prevent a collision with another car, braking through impact‐to‐pedestrian prevention and conventional (rectilinear) car braking. The main attention in the analysis of the mentioned road situations is paid to veracity of the car braking distance, i.e. to limits of variation of values of this parameter and also to influence of accidental factors on the final result which is being looked for. Some conclusions on the expediency of application of the described methods of calculations to analysis of road accidents are present.

scholarly journals ANALYSIS METHOD OF CALCULATION PARAMETERS OF HEAT AND MASS TRANSFER PROCESSES IN THE STIRLING ENGINE

2017 ◽  
Vol 3 ◽  
pp. 298
Author(s):  
Sergej Semyonov ◽  
Sergej Tikhonov ◽  
Mihail Donchenko ◽  
Jurij Lukyanov ◽  
Andrej Perminov
Keyword(s):  
Mathematical Model ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Analysis Method ◽  
Calculation Methods ◽  
Method Of Calculation ◽  
Transfer Processes ◽  
Mass Transfer Processes ◽  
The Mathematical Model ◽  
Optimal Calculation

The article highlights the optimal calculation methods for determining the parameters of heat and mass transfer processes occurring in the rotary-vane engine with an external supply of heat. It is shown that the mathematical model of working processes must consist of two parts. One part describes the processes occurring in the isolated volume. The second part describes the processes of mass exchange between the working chambers of two modules, as well as a heater or a cooler.

Calculation of suspended sediment deposition intensity in grass-covered floodplains

2007 ◽  
Vol 38 (2) ◽  
pp. 151-163 ◽  
Author(s):  
Alfonsas Rimkus ◽  
Saulius Vaikasas ◽  
Romas Pukštas
Keyword(s):  
Heavy Metals ◽  
Mathematical Model ◽  
Suspended Sediment ◽  
Sediment Deposition ◽  
River Ecology ◽  
Calculation Methods ◽  
Sandy Bottom ◽  
River Deltas ◽  
Deposition Intensity ◽  
The Mathematical Model

Flooded river valley meadows are very important for river ecology, as they entrap sediments and sediment-bound nitrogen or heavy metals. Nevertheless, the grass-covered floodplains, particularly in river deltas, are often separated from the rivers by dykes. When such systems are designed, it is necessary to model sediment deposition in these separated areas. However, the existing calculation methods and models are adapted for flow over the sandy bottom. In the meadow flows there are other boundary conditions more favourable for sediment deposition. The focus of our studies was the processes of suspended sediment deposition in the flooded delta of the River Nemunas. Calibration results of the mathematical model with common sediment deposition formulae for riverbed flows did not correspond to the data of measurements. The differences were obvious. Consequently, it was necessary to study the peculiarities of flow and sediment motion under these conditions, as well as to work out formulae suitable for calculations.

The Application of Simulation Technology in the Inventory System

2013 ◽  
Vol 380-384 ◽  
pp. 1473-1476
Author(s):  
Zhan Li ◽  
Da Shen Xue
Keyword(s):  
Mathematical Model ◽  
Computer Simulation ◽  
Simulation Software ◽  
Simulation Technology ◽  
Mathematical Methods ◽  
Logistics System ◽  
Modeling Simulation ◽  
Modern Computer ◽  
Long Time ◽  
The Mathematical Model

For a long time, the mathematical model is used to describe the systems characteristics and acquire the solutions, so it gradually develops into a modern computer simulation technology, and it can be used to solve many problems which are complex and unable resolve use mathematical methods. Witness modeling simulation software is applied in this article, and examples analysis is put forward in view of the logistics system of inventory control, finally making the models on the part of the module, whats more, it analysis the data and makes the optimal strategy.

scholarly journals Control and stability of the lateral dynamics of the vehicle to avoid road accidents

2021 ◽  
Vol 6 (2) ◽  
pp. 159-168
Author(s):  
Daniel Sava ◽  
Ion Copae
Keyword(s):  
Mathematical Model ◽  
Phase Portrait ◽  
Control Strategies ◽  
Road Accidents ◽  
Technical Data ◽  
Lateral Dynamics ◽  
The Mathematical Model

The paper presents elements related to the control and stability of the lateral dynamics of the vehicle. The mathematical model of the ESC system is given. The study of stability is presented, including by using the phase portrait. The control strategies and algorithms used in ESC are presented. The results obtained using the technical data of the Volkswagen Touareg and Chevrolet Camaro cars are presented.

scholarly journals MATHEMATICAL SIMULATION OF THE CORRELATION BETWEEN THE FREQUENCY OF ROAD TRAFFIC ACCIDENTS AND DRIVING EXPERIENCE

Transport ◽  
2010 ◽  
Vol 25 (3) ◽  
pp. 237-243 ◽  
Author(s):  
Paulius Miškinis ◽  
Vaida Valuntaitė
Keyword(s):  
Mathematical Model ◽  
Statistical Analysis ◽  
Traffic Accidents ◽  
Road Traffic ◽  
Road Traffic Accidents ◽  
Road Accidents ◽  
Driving Experience ◽  
The Mathematical Model ◽  
The Eu

Based on statistical analysis indicating the dependence of the number of road traffic accidents on driving experience, a mathematical model of such correlation is offered. The mathematical model has been tested generating a new approximation using the eigenfunctions of the introduced model applied to draw long‐term forecasts for the dependence of the number of potential road accidents on driving experience. Since we have more road traffic accidents per one hundred thousand inhabitants than other EU countries, comprehensive data analysis might also be useful for the EU community.

scholarly journals EVALUATION OF VERACITY OF CAR BRAKING PARAMETERS USED FOR THE ANALYSIS OF ROAD ACCIDENTS

Transport ◽  
2007 ◽  
Vol 22 (4) ◽  
pp. 307-311 ◽  
Author(s):  
Saulius Nagurnas ◽  
Valentinas Mitunevičius ◽  
Jan Unarski ◽  
Wojciech Wach
Keyword(s):  
Road Accident ◽  
Accident Analysis ◽  
Vehicle Speed ◽  
Road Accidents ◽  
Real Experiment ◽  
The Real ◽  
The Road ◽  
The Given

During the road accident analysis speed of the examined vehicle often is being established in accordance with the length of the trace remained by the vehicle tires. Usually in such case there are values of braking deceleration used for calculations, which are selected from the corresponding references. The real experiment, establishing the braking parameters of the given vehicle, is performed more seldom. In both cases it is important to calculate the vehicle speed in accordance with the received or found values of deceleration as well to estimate the possible limits of the vehicle speed, i.e. to evaluate the veracity of such calculations. This paper presents the results of evaluation of car braking parameters, which are treated as random values in the known probabilistic characteristics.

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