Faculty of Mechanical Engineering

Permanent URI for this communityhttps://repository.ukim.mk/handle/20.500.12188/13

Browse

Search Results

Now showing 1 - 10 of 11

Some of the metrics are blocked by your
consent settings
Improving ride comfort by optimising suspension system of an electric street sweeper
(2022)
Vasko Changoski
;
Ile Mircheski
;
Darko Danev
Some of the metrics are blocked by your
consent settings
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
Some of the metrics are blocked by your
consent settings
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.
Some of the metrics are blocked by your
consent settings
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.
Some of the metrics are blocked by your
consent settings
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.
Some of the metrics are blocked by your
consent settings
DETERMINATION OF LOAD LIMITS ON DRIVE SHAFTS IN HOT ROLLING MILL
(Mechanical Engineering – Scientific Journal, 2014)
Darko Danev
;
Vase Jordanoska
;
Stevan Kjosevski
Drive shaft breakages in rolling mills generate great material losses. Improving the strength characteristics of drive shafts should provide shafts to withstand the maximum loading during the rolling process. Breaking in the shaft critical section may occur when the value of the torque is greater than the value of the torsion moment which can cause plastic flow in the whole cross section. Theoretical calculations and experimental tests were done. The experiment showed that the maximum rolling torque of the upper shaft has a higher value than the torque limit at permanent torsion dynamic strength. The available safety reserves in the critical section were small, only 27%. To increase the strength characteristics, changing in the cross-section design and in material quality for shafts should be done.
Some of the metrics are blocked by your
consent settings
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, carfollowing 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. Carfollowing models describe traffic dynamics through movement of individual vehicle-driver units. This paper compares Gipps model and Intelligent Driver Model (IDM) as carfollowing 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.
Some of the metrics are blocked by your
consent settings
ПОТЕНЦИЈАЛНИ РИЗИЦИ ОД УПОТРЕБАТА НА ТЕЧНИОТ НАФТЕН ГАС КАКО ПОГОНСКО ГОРИВО КАЈ МОТОРНИТЕ ВОЗИЛАТА
(2016)
Vase Jordanoska
;
Darko Danev
;
Aleksandar Kostikj
Течнипт нафтен гас (ТНГ) е најширпкп упптребуванп алтернативнп гпривп кај мптпрните впзила ппкрај бензинпт и дизелпт. ТНГ кпј вп пснпва е безбпен и е без мирис, е прпизвпд пд прпцеспт на рафинираое на други гприва. Негпвата упптреба се дплжи на дпбрите гпривни карактеристики и ниската цена на чинеое. Впзилата кпи гп кпристат ТНГ какп ппгпнскп гпривп се прпизведени сп систем за наппјуваое сп ТНГ или пак, се впзила сп бензински мптпри кпи ппстпрпдажнп имаат вграденп дппплнителен систем за наппјуваое сп ТНГ. Втприте се најчестп двпгпривни впзила, пднпснп имаат мпжнпст за префрлуваое пд еднп на другп гпривп вп текпт на експлпатацијата. Дп сега ппстпјат ппвеќе генерации на системи за наппјуваое сп ТНГ кај впзилата, кпи се развивале паралелнп сп развпјпт на технплпгијата кај бензинските мптпри. Гаспт за да биде вп течна спстпјба се складира при притиспци ппмеду 2.2 и 22 bar зависнп пд пднпспт на кпмппнентите вп негп. За да се запази безбеднпста, впзилата ппремени сп ТНГ системи, какп и самите системи за наппјуваое сп ТНГ се регулирани сп правилници на Екпнпмската кпмисија за Еврппа на Обединетите нации (UNECE). Вп трудпт се дадени ризиците кпи мпжат да прпизлезат пд упптребата на ТНГ системи кај впзилата, какп и причините кпи мпжат да дпведат дп ппјава на пдредени хаварии.
Some of the metrics are blocked by your
consent settings
EVALUATION METHODOLOGY OF DESIGN PARAMETERS INFLUENCE TO THE BRAKING PROCESS OF PASSENGER CAR-TRAILER COMBINATION
(Proceedings of 24th JUMV International Automotive Conference Science & Motor Vehicles, 2013)
Darko Danev
;
Milan Kjosevski
;
Igor Gjurkov
;
Vase Jordanoska
In contemporary traffic, the need of movement for various forms of engagement between the passenger vehicle and the trailer becomes more intensive and emphasized. In certain conditions, in this engagement it may come to non-conformity in relation to the acceleration and braking characteristics of the combination because of design reasons. Therefore, efforts are made to achieve optimal braking performance, steering characteristics and stability through design measures and other engagement constrains of the vehicle combination. Considering the aforementioned, it all started from the suitability to determine the evaluation methodology on the impact of certain design factors to the passenger vehicle - trailer combination behavior in the braking process.
Some of the metrics are blocked by your
consent settings
THEORY OF NETWORK RELATED RESEARCH OF VEHICLES DYNAMICS IN URBAN ENVIRONMENT
(Proceedings of 25th JUMV International Automotive Conference Science & Motor Vehicles, 2015)
Vase Jordanoska
;
Darko Danev
;
Ljupcho Kocarev
Transport and vehicles have great impact on peoples’ life every day. Continuous increase in traffic on the roads is leading to serious issues with congestion, safety and impact on the environment. This is especially emphasized in urban areas. Networks theoryhas been and is very interesting approach studying of vehicle dynamics in urban areas which can help addressing number of said issues. This research has also added regionaldimension which could help development and introducing ITS in similar environment. In this, early stage of research, the initial results showed that the approach of presenting road infrastructure as network (graph) in vehicle simulations proves to be good and opens opportunities for deeper research.

Faculty of Mechanical Engineering

Browse

Filters

Settings

Sort By

Results per page

Search Results