基于分形维数的大型带式输送机动态特性研究
Research on dynamic characteristics of large belt conveyor based on fractal dimension
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摘要: 为定量研究带式输送机启动制动过程中的动态特性，利用基于分形维数的评价方法，分析输送带黏弹性模型特性，建立离散有限元模型与仿真模型，并设计了带式输送机系统正弦速度控制曲线，研究在启动制动时，机头部、机尾部纵向动张力变化特性，应用分形理论分析在不同启动时间下，机头部张力维数与输送机系统稳定性的关系，内置张紧装置与外置张紧装置动态特性。结果表明：分形维数适用于评价带式输送机动态特性，分形维数越大，系统越不稳定，故障率越高，启动时，机头部张力维数大于机尾部，机头部更易发生故障，内置张紧装置载荷维数更大，故障率更高；启动时间为35～40 s时，机头部张力维数较小，带式输送机稳定性较高。Abstract: In order to quantitatively study the dynamic characteristics of belt conveyor during starting and braking，the characteristics of the viscoelastic model of conveyer belt were analyzed by fractal dimension-based evaluation method.The discrete finite element model and the simulation model were established.The sinusoidal speed control curve of belt conveyor system was designed.The characteristics of longitudinal dynamic tension of nose part and rear part of belt conveyor during starting and braking were studied.The fractal theory was applied to analyze the relationship between the tension force dimension of the head and the stability of conveyor system at different starting times,and the dynamic characteristics of the built-in tensioner and the external tensioning device.The results show that the fractal dimension is suitable for evaluating the dynamic characteristics of the belt conveyor.When the fractal dimension increases,the stability of the system becomes worse and the failure rate of belt conveyor becomes higher.When starting,the tensioning dimension of the head part is larger than that of rear part of engine,the head part is more prone to failure,and the built-in tension device has larger load dimension and higher failure rate.When starting time is 35～40 s,the tension dimension of the head part is small,and the belt conveyor has high stability.
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Keywords:
- belt conveyor /
- dynamic characteristics /
- starting and braking /
- failure rate
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