Dynamical Behavior of Coal Shearer Traction-swing Coupling under Corrected Loads

Area of Science:

• Mechanical Engineering
• Mining Engineering
• Vibration Analysis

Background:

• Vibration is a significant issue in coal mining operations involving shearers.
• Severe vibration and large load impacts affect shearer performance and longevity.
• Accurate modeling is crucial for analyzing complex system dynamics and mitigating vibration.

Purpose of the Study:

• To develop and validate a comprehensive numerical model for characterizing the nonlinear dynamics of coal shearer traction-swing coupling.
• To analyze the dynamic responses of critical shearer components under operational conditions.
• To provide a theoretical foundation for optimizing shearer structure and process parameters.

Main Methods:

• A 13-degree-of-freedom (DOF) numerical model was created using vibration mechanics and multibody dynamics.
• Contact mechanics were modeled using 3D fractal theory (sliding shoe) and Hertz contact theory (driving wheel).
• Component rigidity was characterized using Hooke's law, with external excitation from experimentally corrected drum loads.

Main Results:

• The numerical model successfully characterized and analyzed the dynamic responses of critical shearer components.
• Model validation against experimental mechanical test data confirmed its accuracy under various operating conditions.
• The study identified key vibration characteristics and their impact on shearer components.

Conclusions:

• The developed numerical model accurately represents the complex nonlinear dynamics of coal shearer vibration.
• The findings offer a theoretical basis for improving shearer structural design and operational parameters.
• This research contributes to reducing vibration and enhancing the efficiency of coal mining operations.