Modeling and Optimization of Soft Start‐Up for Hydroviscous Drive Applied to Scraper Conveyor

Li, Long; Cui, Henggang; Zi-sheng, Lian; Wang, Qiliang

doi:10.1155/2019/6131364

Cited by 9 publications

(5 citation statements)

References 16 publications

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“…Using the measured shoulder damage depths shown in Table 3 , the main and interaction effects of the cutting parameters on the shoulder damage depth can be discussed, as shown in Figure 6 [ 30 ]. The larger slope of the main effect curve indicates that the single factor feed f or cutting depth a p has a higher effect on the shoulder damage depth.…”

Section: Resultsmentioning

confidence: 99%

Shoulder Damage Model and Its Application for Single Point Diamond Machining of ZnSe Crystal

et al. 2021

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The damaging of ZnSe crystal has a significant impact on its service performance and life. Based on the specific cutting energies for brittle and ductile mode machining, a model is proposed to evaluate the damage depth in the shoulder region of ZnSe crystal during single point diamond machining. The model considers the brittle-ductile transition and spring back of ZnSe crystal. To verify the model, the elastic modulus, hardness, spring back, and friction coefficient of ZnSe crystal are measured by nanoindentation and nanoscratch tests, and its critical undeformed chip thickness is obtained by spiral scratching. Meanwhile, orthogonal cutting experiments are conducted to obtain the different shoulder regions and cutting surfaces. The shoulder damage depth is analyzed, indicating that the effect of the feed on the damage depth at a high cutting depth is stronger than that at a low one. The model is verified to be effective with an average relative error of less than 7%. Then, the model is used to calculate the critical processing parameters and achieve a smooth ZnSe surface with a roughness Sa = 1.0 nm. The model is also extended to efficiently predict the bound of the subsurface damage depth of a cutting surface. The research would be useful for the evaluation of surface and subsurface damages during the ultra-precision machining of ZnSe crystal.

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Section: Resultsmentioning

confidence: 99%

Shoulder Damage Model and Its Application for Single Point Diamond Machining of ZnSe Crystal

et al. 2021

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“…The chainring is vulnerable to significant impacts, leading to instability in the chain drive system [5,6]. Furthermore, the stability of the scraper conveyor drive motor control subsystem is also affected by operational factors such as high starting torque, imbalanced load, and frequent stops and starts [7][8][9]. Therefore, investigating the dynamic properties of the chain drive system in various operational scenarios and analyzing the operational principles of the motor in the drive control system hold immense importance and value in enhancing the overall performance of the scraper conveyor and advancing the efficiency of fully mechanized mining transportation.…”

Section: Introductionmentioning

confidence: 99%

Simulation Study on Dynamic Characteristics of the Chain Drive System for Mining Scraper Conveyor Driven by the Permanent Magnet Synchronous Motor

Zhang,

Ren,

Wang

et al. 2024

Processes

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The chain drive system represents a critical subsystem within the scraper conveyor. This paper proposes a joint simulation model for the drive system of the scraper conveyor, driven by the permanent magnet synchronous motor, in order to conduct a comprehensive analysis of the dynamic characteristics of the chain drive system during the operational process. Firstly, the dynamic simulation model for the mining scraper conveyor’s chain drive system was established in ADAMS, taking into account its structural characteristics. Then, the mathematical model of the permanent magnet synchronous motor was established using the coordinate transformation theory, and the speed controller based on vector control was designed by using the theory related to sliding mode control. The coupling relationship between the chain drive system of the scraper conveyor and the permanent magnet synchronous motor drive system was investigated. Finally, a joint simulation model of the mechanical system and motor control system was created using ADAMS (View 2019) and MATLAB/Simulink (2020a). The dynamic characteristics of the chain drive system were analyzed, and the three typical working conditions of no load, half load, and rated load were considered. The results show that the contact force between the flat ring and the sprocket undergoes an initial increase, followed by a decrease, and finally another increase. As the load increases from no load to full load, there is a marked increase in the contact force between the loaded side chainrings. Due to the polygon effect, both the speed curve of the permanent magnet drive motor and the contact force curve between the ring chains exhibit periodic fluctuations. The research in this paper provides an idea for the coupling analysis of the scraper conveyor electromechanical system.

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“…To achieve a smooth starting of the AFC, a composite sliding mode control based on the load characteristic of the permanent magnet direct-driven system is presented by Lu et al (2017). A mathematical model of the torque for controllable starting transmission is established by Li et al (2019a) to improve the starting performance of the AFC under different working conditions. A new permanent magnetic eddy current driving system is proposed by Li and Wang (2021) to solve the energy-saving drive problem of the AFC working under bad conditions.…”

Section: Introductionmentioning

confidence: 99%

“…(2017). A mathematical model of the torque for controllable starting transmission is established by Li et al. (2019a) to improve the starting performance of the AFC under different working conditions.…”

Section: Introductionmentioning

confidence: 99%

Dynamic modelling of an armoured face conveyor considering the curved chains

Yuan

Zhang

2023

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PurposeDue to the structural layout, mining process, and working environment, curved chains such as horizontal and vertical bends inevitably exist in the armoured face conveyor (AFC). With the increasing power, conveying capacity, and distance of the AFC, the dynamic influence of these curved chains should be highly emphasized. This paper establishes a dynamic model of the AFC by multi-body system theory and finite segment method, in which the curved chains can be fully considered.Design/methodology/approachThe scraper chains are firstly grouped into the straight, horizontal bend, vertical convex and concave bend sections. Each bend section running in a circle is simplified as an ideal arc. Through solving its differential equilibrium equation and using Newton's second law, its running resistance is derived. Then the grouped chains are discretized into finite control elements according to the Kelvin model, and the governing equation of each control element is established. The dynamic model of the AFC is obtained by assembling these equations, and the corresponding simulation model is developed by using MATLAB/Simulink.FindingsCase studies with real scenarios are provided, and simulations are carried out. The results show that the running resistance contributed by the curved chains is larger than the traditional empirical value.Originality/valueThe work in this paper helps the dynamic performance design of AFC, with a deep understanding of the curved chains.

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Modeling and Optimization of Soft Start‐Up for Hydroviscous Drive Applied to Scraper Conveyor

Cited by 9 publications

References 16 publications

Shoulder Damage Model and Its Application for Single Point Diamond Machining of ZnSe Crystal

Shoulder Damage Model and Its Application for Single Point Diamond Machining of ZnSe Crystal

Simulation Study on Dynamic Characteristics of the Chain Drive System for Mining Scraper Conveyor Driven by the Permanent Magnet Synchronous Motor

Dynamic modelling of an armoured face conveyor considering the curved chains

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