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Shpetim Lajqi, 2013, doktorska disertacija

Opis: The key goal of doctoral thesis was to conceive, design, optimize, and analyze the suspension and steering systems for a four wheel drive and four wheel steered terrain vehicle. The common characteristic of a terrain vehicle is the greater motion of the wheels in order to protect the vehicle from rollover risk when running over rough terrain. Known suspension and steering systems have serious weaknesses. In order to ensure good driving comfort, efficient driving safety, and higher maneuverability, new principles of suspension and steering systems are proposed. The proposed suspension system has been successfully derived from a classical double wishbone control arm. The control arms are long but both equal. Greater wheel motion has been ensured without reducing driving performance. In order to improve the comfort and safety an optimal active damping force has been determined by the active and semi-active systems. On the basis of comprehensive analysis, active system adequacy has been achieved. The proposed suspension design provides relatively small lateral wheel motion, zero camber angles, and it effectively absorbs the vibrations caused by ground configurations. The goal of the developed steering system for this terrain vehicle was to design a new steering mechanism that would provide maneuverability at low speed and suitable stability at higher speed. This has been ensured by two modes of steering, all wheel steer and front wheel steer. The proposed steering mechanisms conform to Ackermann steering geometry for all modes and situations. A totally new steering concept has been developed. This effective design consists of special pairs of gears, known as’ non-circular gears’.
Ključne besede: Terrain vehicle, suspension system, steering system, four wheels steering
Objavljeno: 18.03.2013; Ogledov: 2263; Prenosov: 310
.pdf Celotno besedilo (13,58 MB)

Concept and design of electric car body
Marko Sovič, 2012, diplomsko delo

Opis: In this thesis, a concept multi-material body for an electric vehicle is presented. A selection criteria for materials is made with regard to component function, their traditional shape and the mode of load they have to carry. Initial component design is based on a vehicle reference model. Numerous component modifications are done in dependence on the chosen materials and their production processes. Special attention is payed to the electric vehicle's body structural changes that need to be performed due to the passenger and battery safety. A program for distance simulation is made and used to evaluate cost changes, on a whole vehicle scale, when performing mass-reduction in a vehicle body. It has been proven that it is justified to use light materials.
Ključne besede: body-in-white, electric vehicle, material selection, Catia V5, distance simulation, cost analysis.
Objavljeno: 07.03.2013; Ogledov: 1058; Prenosov: 134
.pdf Celotno besedilo (7,79 MB)

Electric forklifts with vehicle to grid technology for efficient warehouse energy management
Matjaž Knez, Péter Bajor, 2012, izvirni znanstveni članek

Opis: From an electric utility perspective, the sun is an intermittent electrical generator, tolerable in huge quantities, but increasingly difficult to manage. The nature of sun is unpredictable, and the Slovenian National Grid has no significant storage opportunities - if the V2G (vehicle-to-grid) solutions could be competitive in the near future it could prepare for special circumstances: the batteries of electrically driven forklifts could provide attractive storage functions for renewable electricity storage and for backupping the electrical national grid. This paper shows the study of the current research findings on the ŽVehicle to Gridʼ innovative concept and a proposed theoretical model of Forklift-to-Grid integration into energy management of a warehouse. Analyses of data, calculations of the economic value and of the profitability of the proposed business model yielded positive results that fully confirm the thesis that the integration of environmentally friendly renewable energy sources and new technologies into the logistic processes can improve logistics management while minimizing the negative impact of business on the environment.
Ključne besede: CO2 emmisions, forklift-to-grid, photovoltaic, vehicle-to-grid, warehouse energy management
Objavljeno: 10.07.2015; Ogledov: 518; Prenosov: 16
URL Povezava na celotno besedilo

Design of independent suspension mechanism for a terrain vehicle with four wheels drive and four wheels steeering
Shpetim Lajqi, Stanislav Pehan, Naser Lajqi, Afrim Gjelaj, Jože Pšeničnik, Sašo Emin, 2013, izvirni znanstveni članek

Opis: In this paper a terrain vehicle with four wheels drive and four wheels steer intended to use for recreational purpose is presented. The main purpose is to design the suspension mechanism that fulfills requirements about stability, safety and maneuverability. Nowadays, as well as in the past, the development of the suspension systems of the vehicle has shown greater interest by designers and manufacturers of the vehicles. Research is focused to do a comprehensive study of different available independent suspension system (MacPherson, double wishbone, multi-link) and hence forth develop a methodology to design the suspension system for a terrain vehicle. Few chosen suspension systems are analyzed into the very details in order to find out the optimal design of it. During development process of the suspension system should be considered design constraints and requirements provided in the checklist. Afterwards the simulation results for kinematics analyses of suspension mechanism are performed in Working Model 2D and MATLAB environments. Achieved results are discussed in detail in order to find the best solution that will fulfill pretentious requirement from developed suspension system. All these investigations and reviews related to the suspension system will be exploited in order to obtain the optimal suspension geometry to equip a terrain vehicle, with such system.
Ključne besede: terrain vehicle, design, suspension mechanism, suspension geometry
Objavljeno: 10.07.2015; Ogledov: 699; Prenosov: 41
URL Povezava na celotno besedilo

Designs and optimizations of active and semi-active non-linear suspension systems for a terrain vehicle
Shpetim Lajqi, Stanislav Pehan, 2012, izvirni znanstveni članek

Opis: This paper introduces a design and optimization procedure for active and semi-active non-linear suspension systems regarding terrain vehicles. The objective of this approach is the ability to quickly analyze vehicles' suspension performances resulting from passive, active, or semi-active systems. The vehicle is represented by a mathematical model regarding a quarter of it, and equations for motion are derived and solved by using MATLAB/Simulink. In order to verify the reliability of the derived computer program, a comparison is made with one of the comprehensive commercial software packages. The decision parameters of the active damping device are optimized by using the Hooke-Jeeves method, which is based on non-linear programming. The usefulness of the treated active and semi-active systems on a concrete terrain vehicle is presented and compared with the presented passive systems by analyzing the vehicle's body acceleration, velocity, displacement, and vertical tire force, namely those aspects that directly influence driving comfort and safety.
Ključne besede: terrain vehicles, vehicle design, suspension system, semi-active
Objavljeno: 10.07.2015; Ogledov: 435; Prenosov: 60
URL Povezava na celotno besedilo

Evaluating costs of vehicle use in military logistics
Leon Grašič, Tone Lerher, Bojan Rosi, 2016, izvirni znanstveni članek

Opis: The article presents an analytical model of evaluating costs of vehicle use in military logistics adapted to specific construction demands and characteristics of military vehicles, profile (conditions and manner) of use and technological procedures of preventive and remedial maintenance of military vehicles. The proposed model of evaluation enables an equivalent comparison of total costs in advance of use of similar vehicles made by different manufacturers throughout the entire operating period (their service life). Initial (entry) and boundary conditions are clearly defined within the proposed model. The implementation of the analytical model ensures the evaluation and planning of maintenance costs and costs of direct vehicle use in military logistics already at the point of purchasing new vehicles, as well as evaluation of optimal operating period (service life) of vehicles, which leads to increased reliability and availability, and, consequently, to more effective use of military vehicles.
Ključne besede: analytical model, evaluating costs, vehicle use, military vehicles, effective use, military logistics
Objavljeno: 11.07.2017; Ogledov: 480; Prenosov: 203
.pdf Celotno besedilo (514,57 KB)
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Analysis of road traffic safety in Minna Niger State, Nigeria
Adebayo Owolabi Oyetubo, Oluwaseyi Joseph Afolabi, Muhammed Etudaiye Ohida, 2018, izvirni znanstveni članek

Opis: Road traffic accident is one of the major causes of death in Nigeria. Road accidents have taken away so many lives in Nigeria today that hardly does any single disease match its mortality prowess. People have died prematurely and properties worth several millions of Naira have been lost as a result of road traffic accident. This paper gives a full discussion on road traffic safety issues and the methodology used were through the collection of data using questionnaire and accident information from the Nigeria Police Force, FRSC etc. The primary information for this research was sourced through the use of structured questionnaire, personal observation and interviews of road users in the study area. Secondary data emanated from published and unpublished sources such as government records, internet, journals, books etc. The findings were presented in descriptive and inferential form using frequencies, percentages, tables, mean and chi-square analytical techniques. The findings from the study revealed among many others; that Male involved more in road accident compare to female counterpart in Minna Niger State. Private car had more accident compare to Taxi, The number of accident in each zone does not depend on the population of that zone, etc.
Ključne besede: accident, traffic, fatalities, safety, vehicle
Objavljeno: 25.04.2018; Ogledov: 243; Prenosov: 174
.pdf Celotno besedilo (692,91 KB)
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Electrified powertrain configurator
Jernej Kosi, 2019, magistrsko delo

Opis: This master’s thesis describes the development, use and simulation results of the Excel based electrified powertrain configurator tool. First, different electrified powertrains are introduced and divided based on the powertrain type. Within the scope of this master’s thesis, we focused on battery electric vehicles. A mathematical vehicle model was developed to describe different battery electric vehicle powertrain architectures. The mathematical vehicle model was implemented in Excel. The performance of the Excel tool was demonstrated by simulating various driving cycles. To evaluate the accuracy and usability of the tool, simulation results from Excel tool were compared with those from AVL Cruise.
Ključne besede: electrified powertrain, vehicle longitudinal dynamic, driving simulation, Excel, tool development
Objavljeno: 23.12.2019; Ogledov: 143; Prenosov: 0

Comparison of criteria for road safety barrier installation in some countries of the European union
Leonid Ljubotina, 2019, magistrsko delo

Opis: In the master thesis we will analyze regulations which define the criterion for vehicle restraint system installment in certain countries of the European Union. We will focus mostly on Slovenia, Italia and Croatia. Even though all of the three states are members of the European Union, have common borders and the “Mediterranean” TEN corridor passes through these countries, it is possible to conclude that the passive safety equipment on the road infrastructure in those states is not harmonized. There are also big differences between the installation conditions of the traffic safety barriers and category selection of the safety barriers. Analyzing regulations regarding traffic safety barrier installation, we will try to define the differences in equipping roads with safety barriers, depending on road category, definition of black spot and the category of the safety barrier.
Ključne besede: traffic, traffic safety, vehicle restraint system, Mediterranean corridor, guidelines
Objavljeno: 26.09.2019; Ogledov: 109; Prenosov: 38
.pdf Celotno besedilo (3,17 MB)

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