A comprehensive assessment method of coal mine security based on natural weight and variable fuzzy set

Timely and scientific inspections and assessments of safety states are the key link to ensure the security of coalmine productions. The assessment methods directly affect the veracity and objectivity of results, and affect the overall safety management ability too. Combining the variable fuzzy set theory and the method of natural weight, a novel safety assessment model is proposed to evaluate intricate and risk coalmine production. The weight of each index is reasonably determined by natural weight, which can truly present the degree of each index on coalmine security. Fuzzy assessment method based on variable fuzzy set theory can scientifically obtain relative memberships of indexes at level interval that relating to coalmine security level. This model gives qualitative and quantitative assessing results, which meets the requirement for the exact guidance to the practice. The case studies indicate that this proposed model is more scientific and more accurate, and is valuable for generalizations and applications.