A hybrid transient/quasi-static model for wet clutch engagement

Rogkas, N.; Vasilopoulos, L.; Spitas, V.

doi:10.1016/j.ijmecsci.2023.108507

Cited by 3 publications

(2 citation statements)

References 84 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With the increase in pressure in brake cavity 5, the lubricant film between the movable and static friction plates is completely destroyed, in which the rough friction torque plays a major role, and the torque generated by this process makes the load brake. Ignoring the band-rolling torque, the torque calculation equation of friction vice [29,30] is:…”

Section: Modeling Of Free-fall Hook Wet Clutchesmentioning

confidence: 99%

See 1 more Smart Citation

Research on Flexible Braking Control of a Crawler Crane during the Free-Fall Hook Process

Gao,

Song,

Yang

et al. 2024

Processes

View full text Add to dashboard Cite

Due to the large inertia and strong impact accompanying the free-falling hook process of crawler cranes, it is difficult to meet the demand for flexible and smooth braking control under different weight load conditions. Therefore, this paper takes the free-fall hook system as the research object and combines system operation characteristics and control theory to carry out research on flexible braking control of the free-fall hook system. Firstly, a joint simulation platform of MATLAB (version 2018b) and AMESim (version 2019.1) software is built to theoretically analyze the key components of the free-fall hook system (proportional pressure-reducing valve, winch reducer, and wet clutch). Secondly, a mathematical model of the braking process is established, and the pressure control demand is clarified to analyze the reasons for the existence of dead zones and hysteresis loops in the system. Meanwhile, it is found that the dead zones and hysteresis loops existing in the pressure output of the pressure-reducing valve are the main factors of flexibility with load braking. Then, in this paper, a closed-loop control strategy is formulated based on the automatic adaptation of the braking gear in combination with the fuzzy PID pressure. Finally, the effectiveness of the control strategy proposed in this paper is verified with simulation and experimental testing using the pressure hysteresis loop of the free-fall hook process and the load-braking acceleration as the judging criteria. The results show that the system pressure hysteresis loop is reduced by 50%–60% and the maximum braking acceleration is reduced by 24%–30% under the conditions of 6.44 tonnes and 10.44 tonnes, which improves the accuracy of pressure control and achieves flexible and smooth braking with loads for different tonnages of free-fall hooks.

show abstract

Section: Modeling Of Free-fall Hook Wet Clutchesmentioning

confidence: 99%

“…Finally, based on the above analysis of fuzzy control principles and the control rules of the PID controller, the expression of the final controller u is determined, as shown in (30) [40]:…”

Section: Defuzzification To Obtain the Controllermentioning

confidence: 99%