Abstract
In order to study the contact and vibration response in the reciprocating impact between coal gangue particles and metal plate, on the basis of the Hertz contact theory, L-N contact model, and the Lagrange equation, this paper established an impact-contact model when the particles free falling to vertically impacts on the metal plate. The variable damping simulation method is proposed, and the accuracy of the variable damping simulation in the medium reciprocating collision is verified by combining the constant damping simulation, the variable damping simulation, and the falling body impact-contact model. The functional relationship between the damping term and the initial impact velocity in Adams simulation is also obtained. Then, through the rigid-flexible coupling method which is combined by Adams and Hypermesh, the three types of variable damping simulations are conducted: the simulation that the free-falling rigid rock sphere impact on the rigid metal plate, the simulation that the elastic rock sphere impact on the rigid metal plate, and the simulation that the elastic rock sphere impact on the elastic metal plate, respectively. Furthermore, contact and vibrate responses of the rock sphere and the metal plate in the three types of the simulation are studied. The results show that the impact-contact response of the rock sphere obtained from the simulation that the elastic rock sphere impact on the elastic metal plate is more accurate. After the flexible treatment of the rock sphere and the metal plate, most of the system energy is consumed during the impact. The conclusions will provide a theoretical calculation method for the medium vertical reciprocating impact and a theoretical basis for the setting of the damping term in Adams simulation and support the research basis for the study of the impact behavior between coal gangue particles and the metal plate.
Highlights
Coal plays a leading role in China’s energy resources among which the thick coal seam accounts for nearly half of coal reserves [1]
As the digital mine construction and the coal gangue interface identification technology based on the vibration signal of tail beam demands, the research on the vibration signal and impact response caused by mechanical behavior of impact-contact between coal gangue and the metal plate of the hydraulic powered support has become an important project, which is of great significance to the development of coal mining modernization
For the collision behaviors between the coal gangue particles and the impact-contact problems between the coal gangue particles and the hydraulic support metal plate, through the theories, simulations and experiments [2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19], and other methods, many scholars have carried out similar studies on the contact behavior between particles [20] and the contact behavior between particles and plates [21,22,23,24,25] in the early stage, which provides the basis for the research of the collision behavior between coal gangue particles or between the coal gangue and the hydraulic support in the
Summary
Coal plays a leading role in China’s energy resources among which the thick coal seam accounts for nearly half of coal reserves [1]. Yang et al [38] conducted the coal gangue impacting the metal plate experiment and studied the coal gangue recognition based on the test signal and the machine learning algorithms All of these studies above will be guidance or references for the research on the impact behavior between particles and the metal plate of the hydraulic powered support in the topcoal mining. For they mainly focus on the single impact between particles and the plates as well as the vibroimpact response in the process of impact-contact, there are few researches on the global repeated impact collision between the falling body and the plate or the setting of the damping term in the contact simulation process.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
