Underground monitoring power reliable life estimating based on accelerated life testing

In order to assess the reliable life of the DC power supply of the coal mining monitoring system, the accelerated life tests under constant stress were presented based on the exponential distribution. Through a comparative analysis of lots of factors, the temperature was chosen as the constant accelerated stress parameter. With regard to the data statistical analysis, the type-I censoring sample method was put forward. The mathematical model of the coal mining monitoring power supply was established and the average life expectancy curve was obtained under different temperatures through the analysis of experimental data. The results demonstrated that the mathematical model and the average life expectancy curve were fit for the actual very well. It is concluded that the reliability study of the coal mining DC power provides an important foundation for the coal mining monitoring system.