Dynamical behavior of coal shearer under the influence of multiple factors in slant-cutting conditions.
Dynamical behavior of coal shearer under the influence of multiple factors in slant-cutting conditions.
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斜截工况多因素影响下采煤机动力学行为
DOI：
10.1038/s41598-021-98049-x
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发表时间：
2021-09-16
影响因子：
4.6
通讯作者：
Li P
中科院分区：
文献类型：
--
作者：
Yang X;Zou X;Zhang S;Chen H;Wei Y;Li P
针对采煤机在倾斜截割条件下振动剧烈、各部件异常磨损的问题，应用振动力学和多体动力学理论，建立了采煤机在倾斜截割条件下13个自由度的非线性动力学模型，并基于三维分形理论和赫兹接触理论描述了滑靴-中槽接触、带间隙摇臂-牵引部连接和导向滑靴-销轨多面有间隙接触的特点。根据Huco定律，将测距臂和液压杆假设为柔性梁，描述了测距臂本身的刚度特性、牵引部与机身的连接特性，提出了带有牵引速度修正系数的滚筒修正载荷作为系统的外部激励，并对模型进行了求解和分析。研究结果表明，牵引速度的变化对采煤机前滚筒、前摇臂和前行走单元的振动摆角和位移影响较大，三者的振动摆角和位移随牵引速度的提高而增大，而工作面硬度系数的变化对采煤机关键部件的振动位移影响较小。在V= 3 mm/m in和f= 3的工作参数下，前臂和前鼓的摆角和位移在−分别为0.4~0.1rad和-0.1rad/s2和-0.15~15rad mm的范围内波动，振动加速度分别为-300~300rad/s2和-200~200rad/s2，主振频率分别为16.63 GHz和12.14 GHz，并通过实验方法对结果进行了验证。
Aiming at the problem of severe vibration and abnormal wear and tear of various components in coal shearer under slant-cutting conditions, a non-linear dynamics model with 13 degrees of freedom for a coal shearer under slant-cutting conditions is developed using vibration mechanics and multi-body dynamics theory, and the characteristics of the slide shoes-middle groove contact, the ranging arm-haulage unit connection with gaps and the guidance sliding boots-pin rail multi-surface contact with gaps are described based on three-dimensional fractal theory and Hertz contact theory. Based on Huco's law, the ranging arm and the hydraulic rod are assumed to be flexible beams, the rigidity characteristics of the ranging arm itself, the connection characteristics of the haulage unit and the fuselage are described, a drum correction load with a traction speed correction factor is proposed as the external excitation of the system, and the model is solved and analyzed. The research results show that the change of traction speed has a greater influence on the vibration swing angle and displacement of the front drum, front ranging arm and front walking unit, and the vibration swing angle and displacement of the three increase with the increase of traction speed, while the change of coalface hardness coefficient has less influence on the vibration displacement of the key components of the coal shearer. Under the working parameters ofv= 3 m/min andf= 3, the swing angle and displacement of the front ranging arm and front drum fluctuate in the ranges of − 0.4–0.1 rad and – 15–15 mm respectively; the vibration acceleration is – 300–300 rad/s2and – 200–200 mm/s2respectively, the main vibration frequencies are 16.63 Hz and 12.14 Hz respectively, and finally the results are verified by experimental methods.
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影响因子：
1.2
作者：
Boloz, Lukasz
通讯作者：
Boloz, Lukasz
影响因子：
1.5
作者：
Boloz, Lukasz;Castaneda, Leonel F.
通讯作者：
Castaneda, Leonel F.
温度影响下采煤机齿轮传动系统非线性动态特性分析及混沌控制
DOI：
10.1177/0954406219854112
发表时间：
2019-08-01
影响因子：
2
作者：
Chen, Jiajun;Li, Wei;Li, Min
通讯作者：
Li, Min
面齿轮转子系统平移-旋转耦合振动及动力学分析
影响因子：
4.7
作者：
Hu, Zehua;Tang, Jinyuan;Sheng, Zhaohua
通讯作者：
Sheng, Zhaohua
DOI：
10.1007/s12541-017-0132-2
发表时间：
2017-08-01
影响因子：
1.9
作者：
Yang, Yang;Fan, Hao;Ma, Peng-cheng
通讯作者：
Ma, Peng-cheng