Test method to elevators brake shoes uneven wear based on thermal image analysis
                                                           WANG Yiming1, WU Jin2, HU Jianzhong1, PENG Ying1
（1.School of Mechanical Engineering, Southeast University, Nanjing 211189, China; 2.Jiangsu Special Equipment Safety Supervision and Inspection Research Institute Yangzhou branch, Yangzhou 225000, China）

Abstract: Aiming at the problem of elevator braking failure caused by the uneven wear of the elevator brake, the reasons for the uneven wear and the influence of the elevator brake were summarized.The internal energy change of the elevator brake system was analyzed and studied.The change of the heat flux on the surface of the elevator brake was obtained, and a kind of elevator brake based on the thermal image analysis was put forward. The uneven wear test method was used to collect the infrared thermal image of the brake skin on the elevator brake, the mixed noise in the collection process was filtered out, the isotherm feature vector and the gate edge feature vector was extracted, and the uneven wear degree of the elevator brake skin was characterized by calculating the frying distance between the characteristic vector of the isothermal line and the edge eigenvector of the elevator brake .The results indicate that this method can detect the uneven wear of the elevator brake, and figure out the problem that the elevator can not detect the uneven wear of the brake under the condition of undisintegration.

Key words: braking performance of elevator; uneven wear; infrared image; mixed noise reducing; Frechet distance