TY - JOUR AU - Aljawabrah, Ayham AU - Lovas, László TI - Dynamical model for dog clutch shiftability JF - INTERNATIONAL REVIEW OF APPLIED SCIENCES AND ENGINEERING J2 - INT REV APPL SCI ENG VL - Online first PY - 2024 SN - 2062-0810 DO - 10.1556/1848.2023.00745 UR - https://m2.mtmt.hu/api/publication/34539456 ID - 34539456 N1 - Export Date: 18 March 2024 Correspondence Address: Aljawabrah, A.; Department of Railway Vehicles and Vehicle-System Analysis, Muegyetem rkp. 3., Hungary; email: aaljawabrah@edu.bme.hu AB - The dog clutch offers advantages in mass and efficiency, but faces challenges in mismatch speed synchronization, which affects its shiftability. Face impact between dog teeth also reduces its lifespan. Our previous work introduced the kinematical shiftability condition that ensures impact-free gearshift but had limitations due to analysis assumptions. This study eliminates those assumptions, but uses a similar approach. Based on our previous work for dog clutch engagement dynamics, we develop the dynamical shiftability condition. Validation with full dog clutch dynamics showed an agreement. Employing another previous work that introduced shiftability map and parametric study method, we study system parameters impact on shiftability but based on the dynamical shiftability condition. LA - English DB - MTMT ER - TY - JOUR AU - Alsardia, Talal AU - Lovas, László TI - Investigation of the effect of the surface treatment and lubrication during repeated tightening on the nut coefficient of a bolted joint using the Taguchi method JF - JORDAN JOURNAL OF MECHANICAL AND INDUSTRIAL ENGINEERING J2 - JJMIE VL - 18 PY - 2024 IS - 1 SP - 131 EP - 144 PG - 14 SN - 1995-6665 DO - 10.59038/jjmie/180110 UR - https://m2.mtmt.hu/api/publication/34409720 ID - 34409720 N1 - Export Date: 12 April 2024 Correspondence Address: Alsardia, T.; Department of Railway Vehicles and Vehicle System Analysis, Budapest Műegyetem rkp. 3, Hungary; email: alsardia@edu.bme.hu AB - Bolted joints are used extensively in mechanical engineering due to their reusability, appearance, and strength advantages. In different industrial applications, the separated mechanical components are clamped together during the assembly using a tightening process. Estimating precisely the initially achieved clamping force is a persistent problem for providing a secure and reliable connection for a particular design. However, the nut coefficient is one of the exploratory methods used for this purpose. This paper aims to investigate how the nut coefficient of a bolted joint is influenced by factors such as bolt/nut surface treatment and the presence of lubrication at joint contact surfaces throughout the cyclic joint assembly/disassembly process, serving as a simulation for real-life maintenance operations where the same bolt/nut are reused. Torquing cycles were introduced to bolted joints with two surface finishes and four lubrication conditions. The experiments were conducted on bolts at room temperature according to ISO16047. The nut coefficient was calculated for bolt sizes M6*1, M8*1.5, and M10*1.5. The results were analyzed using the analysis of variance and Taguchi method L32 for estimating the contribution of the different factors on the nut coefficient. It was found that the lubrication was the most significant parameter affecting the nut factor regardless of the bolt size. Also, a case study was conducted to investigate the underlying reasons behind the significance of lubrication in influencing the nut coefficient across different bolt sizes. LA - English DB - MTMT ER - TY - JOUR AU - Aljawabrah, Ayham AU - Lovas, László TI - Sensitivity analysis of dog clutch shiftability to system parameters JF - INTERNATIONAL REVIEW OF APPLIED SCIENCES AND ENGINEERING J2 - INT REV APPL SCI ENG VL - 15 PY - 2024 IS - 1 SP - 61 EP - 72 PG - 12 SN - 2062-0810 DO - 10.1556/1848.2023.00644 UR - https://m2.mtmt.hu/api/publication/34094287 ID - 34094287 N1 - Correspondence Address: Aljawabrah, A.; Department of Railway Vehicles and Vehicle System Analysis, Muegyetem rkp. 3, Hungary; email: aaljawabrah@edu.bme.hu AB - Previous studies introduced the shiftability condition for successful gearshift, based on the dog clutch kinematics model containing several parameters. This study analyzes the effect of these parameters on the dog clutch shiftability. A method to study the impact of parameters is proposed. The influence of chosen parameter domains is shown. Their influence is recognized based on the shiftability map and the engagement probability. The initial relative position showed a periodic effect within one pitch region. The teeth number, axial speed, and the backlash positively affected the engagement probability, while the mismatch speed and the overlap distance showed a negative effect. The analysis showed lower limit values for the axial speed and the backlash but higher limit values for the mismatch speed and the overlap distance. LA - English DB - MTMT ER - TY - JOUR AU - Aljawabrah, Ayham AU - Lovas, László TI - Study the effect of the tooth chamfer angle on the dog clutch shiftability JF - DESIGN OF MACHINES AND STRUCTURES J2 - DESIGN MACHINES STRUCTURES VL - 13 PY - 2023 IS - 1 SP - 12 EP - 27 PG - 16 SN - 1785-6892 DO - 10.32972/dms.2023.002 UR - https://m2.mtmt.hu/api/publication/34032374 ID - 34032374 AB - This paper studies the shiftability of the face dog clutch with chamfered teeth. The effect of the chamfer angle on the shiftability map and the probability are studied. In contrast to previous studies, a generalized mathematical model is developed based on the shiftability condition. The analysis considered two sets of cases: the overlap distance cases, and the chamfer side cases. The overlap distance cases locate the successful engagement position. The chamfer side cases investigate the effect of the system geometry and consider two cases. The results show that the chamfer angle has a negative effect on the dog clutch shiftability. Some geometric parameters show a different effect on the engagement probability for the rectangular tooth and chamfered tooth cases, and this behaviour is also analysed. LA - English DB - MTMT ER - TY - JOUR AU - Aljawabrah, Ayham AU - Lovas, László TI - Dynamic Modeling of the Dog Clutch Engagement Process Using Hybrid Automata JF - JORDAN JOURNAL OF MECHANICAL AND INDUSTRIAL ENGINEERING J2 - JJMIE VL - 17 PY - 2023 IS - 1 SP - 127 EP - 138 PG - 12 SN - 1995-6665 UR - https://m2.mtmt.hu/api/publication/33683175 ID - 33683175 N1 - Correspondence Address: Aljawabrah, A.; Department of Railway Vehicles and Vehicle-System Analysis, Sztoczek u. 2., Hungary; email: aaljawabrah@edu.bme.hu LA - English DB - MTMT ER - TY - JOUR AU - Alsardia, Talal AU - Lovas, László TI - Súrlódás változása csavarkötésben többszöri meghúzás esetén (Friction variation in a bolted joint during cyclic tightening) JF - GÉP J2 - GÉP VL - LXXIV PY - 2023 IS - 1 SP - 5 EP - 8 PG - 4 SN - 0016-8572 UR - https://m2.mtmt.hu/api/publication/33648589 ID - 33648589 LA - English DB - MTMT ER - TY - JOUR AU - Aljawabrah, Ayham AU - Lovas, László TI - Kinematical model of the dog clutch shifting JF - GÉP J2 - GÉP VL - LXXIV PY - 2023 IS - 1 SP - 9 EP - 12 PG - 4 SN - 0016-8572 UR - https://m2.mtmt.hu/api/publication/33647317 ID - 33647317 LA - English DB - MTMT ER - TY - JOUR AU - Alsardia, Talal AU - Lovas, László TI - EFFECT OF LUBRICATION DURING CYCLIC TIGHTENING ON THE BOLT PRELOAD FORCE JF - GÉP J2 - GÉP VL - LXXIII PY - 2022 IS - 3-4 SP - 88 EP - 91 PG - 4 SN - 0016-8572 UR - https://m2.mtmt.hu/api/publication/33216041 ID - 33216041 AB - This paper investigates how repeated tightening and loosening affect the generated preload in a bolted joint. Experiments were conducted on a zinc-coated bolt with three different diameter sizes. The torque tension relationship was compared experimentally of four lubrication types based on the torque coefficient factor LA - English DB - MTMT ER - TY - JOUR AU - Aljawabrah, Ayham AU - Lovas, László TI - DYNAMIC MODELING OF AN ELECTROMECHANICAL GEARSHIFT ACTUATOR JF - GÉP J2 - GÉP VL - LXXIII PY - 2022 IS - 3-4 SP - 19 EP - 22 PG - 4 SN - 0016-8572 UR - https://m2.mtmt.hu/api/publication/33206515 ID - 33206515 LA - English DB - MTMT ER - TY - CHAP AU - Aljawabrah, Ayham AU - Lovas, László TI - Study of the dog clutch shiftability T2 - VII. Gépészeti Szakmakultúra Konferencia PB - Gépipari Tudományos Egyesület (GTE) CY - Budapest SN - 9789639058477 PY - 2022 PG - 4 UR - https://m2.mtmt.hu/api/publication/33206041 ID - 33206041 LA - English DB - MTMT ER -