Vibration Response Analysis of the Tail Beam of Hydraulic Support Impacted by Coal Gangue Particles with Different Shapes

Abstract

The existing research on coal gangue identification based on vibration usually assumes that coal gangue particles are ideal shapes. To understand the vibration response difference in hydraulic support caused by coal and gangue with real shapes, this paper uses a three-dimensional (3D) scanning technology to determine the real shape of coal particles. The process of coal and gangue impacting the tail beam at different angles was simulated in the LS-DYNA software package, and the effects of shape parameters, velocity, and coal strength on the difference in vibration signals caused by the two were analyzed statistically. The conclusions are as follows: the vibrational response of the tail beam is concentrated mainly in the area between the ribs. The regularity of the velocity signal caused by gangue is better than the regularity of the velocity signal caused by coal, and the attenuation speed of the acceleration signal of gangue is slower than the attenuation speed of the acceleration signal of coal. The probability distributions of the velocity and acceleration responses were analyzed statistically, and the results show that the results from coal can be well fitted by a logarithmic normal function, and the standard deviations of velocity and acceleration are 0.05591 and 489.8, respectively. The gangue results are fitted by the gamma function and the Weibull function, and the standard deviations are 0.13531 and 737.9, respectively, showing that the fitting function has the potential to be used as the basis for coal gangue identification. The change in coal strength has little effect on the vibration response of the tail beam. With increasingly falling velocity, the vibration signal intensity of the tail beam increases, but the discrimination between coal and gangue weakens; therefore, measures should be taken to reduce the falling velocity of the rock mass. The research results of this paper can provide a reference for further study of coal gangue identification methods based on vibration.

Study on Roof Instability Effect and Bearing Characteristics of Hydraulic Support in Longwall Top Coal Caving

“…Table 2 shows the mechanical properties of the overlying strata based on the working face's overlying strata structure. The Holmquist-Johnson-Cook model, often known as the HJC model, is frequently used to examine the mechanical behavior of rock [49][50][51], and adds the keyword MAT_ADD_EROSION to simulate the failure of the material [52]. The failure criterion of rock is based on reference [53].…”

Study on Coal Gangue Identification Based on Vibration and Its Adaptability to Coal-Caving Process Parameters

“…Tis method can efectively resist the infuence of various noises and dust, and since its characteristics are based on the vibration sensors, it also makes the installation of equipment more convenient, so it has a good application prospect. However, at present, the research on coal gangue identifcation based on vibration mainly focuses on the impact process of a small number of rock particles and signal processing [13][14][15]. Tere are a few studies on the coal gangue identifcation efect in the whole process of coal caving, while no study has yet focused on how the application efect of the vibration identifcation method is afected by the numerous process parameters of the coal release process and environmental conditions.…”

Recognition method of coal and gangue based on multispectral spectral characteristics combined with one-dimensional convolutional neural network

“…The separation of coal and gangue can be mainly divided into two categories: wet gangue separation and dry gangue separation. Among them, the dry gangue separation represented by ray separation [X-ray (Zhang et al, 2021) and dual-energy gamma-ray (Yazdi and Esmaeilnia, 2003)], laser separation (Wang and Zhang, 2017), vibration separation (Wan et al, 2022), crushing separation (Yang et al, 2018), and visual separation (Bai et al, 2021) do not consume water resources, which is conducive to the environment. At present, it has become the mainstream separation method.…”