Faculty of Mechanical Engineering

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Author: search.filters.author.Darko DanevLanguage: search.filters.language.English (United States)

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    IMPACT OF BASALT BASED THREAD LININGS ON THE TRIBOLOGICAL PARAMETERS OF THE CLUTCH LININGS FOR MOTOR VEHICLES
    (Tehnički vjesnik, 2016)
    Darko Danev
    ;
    Simeon Simeonov
    ;
    Vase Jordanoska
    Friction clutches are still the most widely used type of coupling especially in passenger vehicles. Structural construction of friction clutches is not changed significantly, but their performance is what is constantly being improved. Among other factors that determine the life of the friction clutch i.e. of the friction disk is the quality and friction characteristics of linings. This paper presents the results of experimental research of the impact of the material composition of the linings on the tribological parameters. Specifically are shown the improvements that can be achieved with the use of basalt thread in the material composition of the friction linings
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    COMPARATIVE ANALYSIS OF CAR FOLLOWING MODELS BASED ON DRIVING STRATEGIES USING SIMULATION APPROACH
    (Mobility & Vehicle Mechanics International Journal for Vehicle Mechanics , Engines and Transportation Systems, 2018)
    Vase Jordanoska
    ;
    Igor Gjurkov
    ;
    Darko Danev
    Transportation and traffic affect all the aspects of everyday life. To better understand traffic dynamics traffic models are developed. On microscopic level, car-following models are developed and improved during long period of time. They are used in traffic simulation tools or are the basis for operation in some advanced vehicle systems. Car-following models describe traffic dynamics through movement of individual vehicle-driver units. This paper compares Gipps model and Intelligent Driver Model (IDM) as car-following models based on driving strategies. These models are derived based on assumptions such as keeping safe distance from the leading vehicle, driving at a desired speed and producing accelerations within a comfortable range. The models are implemented and simulated in MATLAB environment and the results are discussed in terms of the ability to reproduce real driving behaviour in car following scenarios.
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    Evaluating Coordinated Cooperative Control of Three Active Car Systems Using Fuzzy-Logic
    (IOP Conf. Series: Materials Science and Engineering, 2021)
    Vase Jordanoska
    ;
    Darko Danev
    ;
    Vasko Changoski
    Vehicle systems automation is an inevitable process as a result of the growing safety requirements and the trend of increasing car operation autonomy by reducing driver’s influence. The paper covers the coordinated control operation of three active systems to assess the improvement of vehicle response. Direct yaw control through selective wheel braking (DYC), active front steering control (AFS) and active suspension normal force control (NFC) are included. The control method is fuzzy logic. The modelling is done in Matlab/Simulink, where 14-DOF nonlinear full vehicle model and 3-DOF reference model were introduced. Simulations were done for three manoeuvres: cornering event, single lane change and fishhook manoeuvre, at a speed of 130 km/h and dry road surface with adhesion coefficient of 0.9 was assumed. Coordination was done with adjusting scaling factors for each control. Results show improvements in the transient response behaviour of the vehicle compared with four vehicles: vehicle without any active system, vehicle with coordinated DYC and AFS, vehicle with coordinated DYC and NFC and vehicle with coordinated AFS and NFC. The biggest impact can be seen in results for sideslip angle and roll angle, coordinated cooperative control here gives lowest values in the transient period during the manoeuvre. Although it gives better results for the other variables as well. The goal of the coordinated cooperative control is fulfilled by improving the stability and handling of the vehicle, which helps the driver to maintain the feeling of manoeuvrability and the sense for the direction of movement of the vehicle. The system for direct yaw control through selective wheel braking has major impact but the coordination with the other two systems lowers the braking force per wheel. The system for active front steering control has lower impact but at lower speeds helps for maintaining better direction of vehicle movement. Considering these three active systems act simultaneously during high speeds and critical manoeuvres next step would be to define sequence of activation depending on the currently measured vehicle behaviour variables.
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    Coordinated Control of ESC with Active Front Steering and Active Suspension Normal Force Control for Better Vehicle’s Dynamic Response
    (IOP Conference Series: Materials Science and Engineering, 2022)
    Vase Jordanoska
    ;
    Vasko Changoski
    ;
    Darko Danev
    Advances in vehicle technologies brought changes into architectures of integration of chassis control systems. Alongside other improvements, integration can provide better vehicle handling, stability and safety. Different chassis control systems can use different control methods. Considering while in motion vehicle has movements in longitudinal, lateral and vertical direction, different control systems target different motion. If there is no coordination among active control systems, interaction and performance conflict can arise. This paper presents coordination of three control systems: electronic stability control (ESC), active front steering control (AFSC) and active suspension normal force control (ASNF). ESC is actually direct yaw and anti-roll control using selective wheel braking. ASNF is considered only on front axle. All systems use fuzzy-logic as a control method. Vehicle is presented as 14-DOF nonlinear full vehicle model and for the control purposes 3-DOF reference model was introduced. Emphasis was given on vehicle parameters characterizing dynamic behavior in longitudinal and lateral direction. Benefits of coordinated action of the three systems can be seen from the results gained through simulation of cornering event and single lane change in Matlab/Simulink. Coordinated control adds to the action of ESC itself, resulting in improved stability and handling, and thus safety of the vehicle.