Sparse Mobile Crowdsensing for Gas Monitoring in Coal Mine Working Face

Gas disaster is one of the major disasters faced by coal mines, and more than 50% of gas disasters are concentrated in the working face. However, due to the small number of gas monitoring sensors and the heavy workload of artificial inspection of the working face, it is very difficult to monitor the high coverage of the working face. Aiming at the problems of low coverage of monitoring data and high acquisition cost, this article uses sparse mobile crowdsensing (MCS) to monitor the gas concentration, which specifically involves the cell selection of sensing area and the data inference of gas concentration in unaware area. First, this article combines gas source distribution and working face air flow characteristics to efficiently divide the gas concentration sensing cells. We propose cell selection based on distributed weighted self-attention mechanism deep reinforcement learning (DWS-DQN). The cell selection algorithm utilizes an attention mechanism to capture the key states of reinforcement learning to assist in optimization and decision making. Second, we propose gas concentration inference based on diffusion coefficient weighting (DCW). Based on the gas concentration diffusion coefficient of coal mine working face, we weighted the quantitative results of different characteristics to construct the gas concentration inference model. Finally, experiments on two real coal mines sensing data sets verify the effectiveness of our proposed algorithms. Compared to the baseline method, the DWS-DQN model and DCW model both exhibit good performance. The method based on the combination of DWS-DQN and DCW reduces the average MAPE result by 6.87%.

I. Introduction

Gas disaster is a major disaster with the greatest harm and the highest proportion of death in coal mines. With the increase of mining depth and intensity, the amount of gas emission will further increase [1]. According to the statistics of gas disasters in the past ten years, whether the number of accidents or the number of deaths, the probability of occurrence in the working face is more than 50%. From the perspective of gas control strategies, relying on monitoring methods to control the gas concentration exceeding the limit in key areas is an important means of preventing gas accidents [2].