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Influence of vibration mode on the screening process

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International Journal of Mining Science and Technology 2013年第1期23卷 95-98页

作者： Dong Hailin liu chusheng Zhao Yuemin Zhao Lala School of Mechanical and Electrical Engineering China University of Mining & Technology Key Laboratory of Coal Processing and High Efficient Cleaning and Utilization of Ministry of Education School of Chemical Engineering and Technology China University of Mining & Technology

The screening of particles with different vibration modes was simulated by means of a 3D discrete element method (3D-DEM). The motion and penetration of the particles on the screen deck were analyzed for linear, circular and elliptical vibration of the screen. The results show that the travel velocity of the particles is the fastest, but the screening efficiency is the lowest, for the linear vibration mode. The circular motion resulted in the highest screening efficiency, but the lowest particle travel velocity. In the steady state the screening efficiency for each mode is seen to increase gradually along the longitudinal direction of the deck. The screening efficiency increment of the circular mode is the largest while the linear mode shows the smallest increment. The volume fraction of near-mesh size particles at the underside is larger than that of small size particles all along the screen deck. Linear screening mode has more near-mesh and small size particles on the first three deck sections, and fewer on the last two sections, compared to the circular or elliptical modes.

关键词： Vibration mode Screening process Particles Discrete element method

Characteristics analysis of a novel centralized-driving flip-flow screen

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International Journal of Mining Science and Technology 2014年第2期24卷 195-200页

作者： Peng Liping Li Fengming Dong Hailin liu chusheng Zhao Yuemin Duan Chenlong School of Mechanical and Electrical Engineering China University of Mining & Technology Tangshan Research Institute China Coal Technology and Engineering Group Corp. School of Chemical Engineering and Technology China University of Mining & Technology

During screening operation, blinding or clogging of screen perforations generally occurs to reduce the sieving capacity and efficiency. Recently, the flip-flow screening has been widely recognized as a feasible method to deal with the problem. In this paper, a novel centralized-driving flip-flow screen(CFS) was developed for the separation of fine and moist coal, and the key structures, namely, a centralized-driving mechanism and a quasi-circle beam mounted with the mat were designed for high reliability and stability. By means of a test on an experimental prototype, the effect of some factors, i.e., initial stretch and hardness of the polyurethane panel, respectively, and the rotation speed of the driving motor on the kinematic characteristic of the screen surface was investigated. Results show that without an initial stretch, the sieve mat generates the largest vibratory amplitude while the slacker the sieve mat initially is, the smaller amplitude it will accomplish. And an increase in the rotation speed could cause a rise in the vibratory amplitude. Unlike the two factors, the hardness does not have a definite effect on the kinematic performance, on which a further study is required. Finally, screening processing on a laboratory prototype was conducted to draw the conclusion that the developed CFS also has a high sieving efficiency for the fine and moist coal.

关键词： Centralized-driving Flip-flow screen Fine and moist coal Kinematic characteristic Sieving capacity and efficiency

DEM simulation of particle flow on a single deck banana screen

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International Journal of Mining Science and Technology 2013年第2期23卷 277-281页

作者： liu chusheng Wang Hong Zhao Yuemin Zhao Lala Dong Hailin School of Mechanical and Electrical Engineering China University of Mining & Technology Key Laboratory of Coal Processing and High Efficient Cleaning & Utilization of Ministry of Education School of Chemical Engineering and Technology China University of Mining & Technology

A mathematical study of particle flow on a banana screen deck using the discrete element method (DEM) was presented in this paper. The motion characteristics and penetrating mechanisms of particles on the screen deck were studied. Effects of geometric parameters of screen deck on banana screening process were also investigated. The results show that when the values of inclination of discharge and increment of screen deck inclination are 10° and 5° respectively, the banana screening process get a good screening performance in the simulation. The relationship between screen deck length and screening efficiency was further confirmed. The conclusion that the screening efficiency will not significantly increase when the deck length L≥430 mm (L/B ≥ 3.5) was obtained, which can provide theoretical basis for the optimization of banana screen.

关键词： Banana screen Particle flow Discrete element method Numerical simulation

Simulation of the screening process on a circularly vibrating screen using 3D-DEM

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Mining Science and Technology 2011年第5期21卷 677-680页

作者： Zhao Lala Zhao Yuemin liu chusheng Li Jun Dong Hailin School of Mechanical and Electrical Engineering China University of Mining ＆ Technology Xuzhou 221116 China Key Laboratory of Coal Processing and High Efficient Cleaning ＆ Utilization of Ministry of Education Xuzhou 221008 China School of Chemical Engineering and Technology China University of Mining ＆ Technology Xuzhou 221116 China

A numerical study of the motion particulates follow along a circularly vibrating screen deck was done using the three dimensional Discrete Element Method (DEM). The motion of the particles was analyzed. The effects of vibration amplitude, throwing index, and screen deck inclination angle on the screening process are discussed. The results show that the average velocity of the particles increases along the lon- gitudinal direction of the deck. The screening efficiency is highest when the vibration amplitude, throw- ing index, and screen deck inclination angle are 3-3.5 mm, 2.7 and 15°, respectively. This work is helpful for developing a deep understanding of particle motion and for optimizing screen separator designs.

关键词： Particulate materialsDiscrete Element MethodCircular vibrating screeningNumerical simulation

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垃圾压缩站箱体结构的荷载分析及轻量化设计

中国机械工程 2017年第17期28卷 2124-2130页

作者：李昂刘初升中国矿业大学机电工程学院徐州221000

通过对垃圾压缩站箱体进行应力-应变测试,获得了箱体在工作过程中的荷载分布形式。采用Hyperstudy对曲线进行拟合筛选,得到与试验结果最匹配的荷载分布函数,并作为箱体优化分析的边界条件。同时引入超单元技术对模型进行简化处理,使得... 详细信息

通过对垃圾压缩站箱体进行应力-应变测试,获得了箱体在工作过程中的荷载分布形式。采用Hyperstudy对曲线进行拟合筛选,得到与试验结果最匹配的荷载分布函数,并作为箱体优化分析的边界条件。同时引入超单元技术对模型进行简化处理,使得模型的优化效率得到了大幅度提高。传统优化算法与超单元算法的对比验证了采用超单元技术处理复杂模型的有效性。

关键词：垃圾压缩站荷载分布超单元拓扑优化轻量化设计

基于超单元技术的大型复杂结构的拓扑优化设计

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中国机械工程 2017年第20期28卷 2467-2474页

作者：李昂刘初升中国矿业大学机电工程学院徐州221116

采用超单元技术处理与车架相连的履带部分模型,并用拓扑优化方法对起重机车架的结构进行重新设计。结果表明,超单元法与传统的全模型分析法相比,求解精度相同,而计算时间仅为全模型分析法的1/3,达到了节省计算时间且保持计算精度的目的... 详细信息

采用超单元技术处理与车架相连的履带部分模型,并用拓扑优化方法对起重机车架的结构进行重新设计。结果表明,超单元法与传统的全模型分析法相比,求解精度相同,而计算时间仅为全模型分析法的1/3,达到了节省计算时间且保持计算精度的目的。最后通过有限元分析和疲劳试验验证了利用超单元法处理复杂模型的可行性。

关键词：起重机车架超单元拓扑优化轻量化设计

空间6R机械臂位置逆解的复合形差分进化算法

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机械工程学报 2014年第15期50卷 45-52页

作者：何兵车林仙刘初升黄勇刚中国矿业大学机电工程学院徐州221116 泸州职业技术学院工程机械智能优化设计泸州市重点实验室泸州646005 重庆工程职业技术学院机械工程学院重庆400037 重庆工商大学机械工程学院重庆400067

以6自由度TX60型Staubli工业机械臂为研究对象,通过运动学分析,建立求解该机械臂位置逆解的非线性方程组。以末端执行器位姿误差最小为目标函数,将非线性方程组转化为无约束优化模型,并应用差分进化算法(Differential evolution algorit... 详细信息

以6自由度TX60型Staubli工业机械臂为研究对象,通过运动学分析,建立求解该机械臂位置逆解的非线性方程组。以末端执行器位姿误差最小为目标函数,将非线性方程组转化为无约束优化模型,并应用差分进化算法(Differential evolution algorithm,DE)求解该问题。为克服基本DE难以平衡收敛精度和计算可靠性的缺陷,提出一种自适应分工复合形差分进化算法(Adaptive division complex DE algorithm,ADCDE),以增强优化性能。该算法将种群自适应划分为开采子群和勘探子群,前者采用DE/best/2/bin策略生成变异个体,而后者采用复合形算子生成变异个体。给出工程应用实例,应用ADCDE求串联机械臂的位置逆解。仿真结果表明,该算法的计算精度和可靠性优于对比算法,应用较少计算开销即可求出高精度位置逆解,且能求得所有可能逆解,验证了该方法的有效性和可行性。

关键词：机械臂位置逆解差分进化算法复合形法自适应分工

张紧量对单边驱动式弛张筛筛面动力学参数的影响

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煤炭学报 2018年第2期43卷 571-577页

作者：邹梦麒刘初升武继达王振乾中国矿业大学机电工程学院江苏徐州221116

为解决传统筛分设备在处理潮湿细粒煤炭时存在严重堵孔的问题,设计了一种单边驱动式弛张筛。根据单边驱动式弛张筛的结构和筛面弛张原理,建立了弛张筛筛面的动力学模型,研究了正、负两种张紧量对筛面动力学参数的影响。借助Matlab软件... 详细信息

为解决传统筛分设备在处理潮湿细粒煤炭时存在严重堵孔的问题,设计了一种单边驱动式弛张筛。根据单边驱动式弛张筛的结构和筛面弛张原理,建立了弛张筛筛面的动力学模型,研究了正、负两种张紧量对筛面动力学参数的影响。借助Matlab软件绘制出筛面中点的位移、速度、加速度特性曲面,将正、负两种张紧量对筛面动力学参数的影响加以对比分析。利用ANSYS Workbench软件对不同张紧量的筛面进行瞬态动力学分析,研究筛面中点的位移、速度、加速度最大时,筛面上各点的位移、速度、加速度分布情况。研究结果表明:随张紧量的增加,筛面的挠度减小,速度、加速度增加。当筛面张紧量选取在2 mm左右时,筛面加速度能够达到50 g,筛分效果比较理想。

关键词：单边驱动式弛张筛筛面张紧量动力学参数瞬态动力学分析

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一种蛙跳和差分进化混合算法

计算机工程与应用 2011年第18期47卷 4-8页

作者：何兵车林仙刘初升中国矿业大学机电工程学院江苏徐州221008 泸州职业技术学院机电工程研究所四川泸州646005

混洗蛙跳算法(SFLA)具有算法简单、控制参数少、易于实现等优点,但在高维难优化问题中算法容易早熟收敛且求解精度不高。导致该缺陷的主要原因是在进化后期种群多样性迅速下降,且缺乏局部细化搜索能力。借鉴差分进化算法(DE)中DE/best/1... 详细信息

混洗蛙跳算法(SFLA)具有算法简单、控制参数少、易于实现等优点,但在高维难优化问题中算法容易早熟收敛且求解精度不高。导致该缺陷的主要原因是在进化后期种群多样性迅速下降,且缺乏局部细化搜索能力。借鉴差分进化算法(DE)中DE/best/1/bin版本具有全局搜索能力较强、种群多样性较好的优点,将SFLA与DE有机融合,形成混合优化算法(SFL-DE),以克服SFLA容易早熟收敛的缺陷。给出了6个30维benchmark问题数值对比实验,结果表明,在给定的较小进化代数内,SFL-DE的寻优效率、计算精度、鲁棒性等性能优于SFLA和基本DE(DE/best/1/bin和DE/rand/1/bin),不足之处是其耗时更长。

关键词：混洗蛙跳算法差分进化算法混合优化连续优化问题