关键词: 塔机起重臂, 结构健康诊断, 双输出单输出ARX模型

Abstract: For the health diagnosis of the tower crane boom structure, a dual-input single-output ARX tower crane boom structure damage diagnosis model based on time series data is proposed. Take the dynamic displacement data of the middle node of the three adjacent nodes on the boom as the output, and use the dynamic displacement data of the two adjacent nodes of the middle node as the input to establish a diagnostic model. The least squares estimation of the model parameters is derived, and in order to further reduce the deviation of the parameter estimation of the least squares method, the flower pollination algorithm is used to optimize the model parameters. The tower crane is modeled by finite element and the dynamic excitation load is applied to the model when the tower crane is hoisted to obtain the dynamic displacement data of the intact and damaged conditions of the relevant nodes on the boom. The diagnosis model is used to process the acquired dynamic displacement data to obtain the damage characteristic parameters, and to define the damage degree parameters, so as to make a more accurate diagnosis of the health status, damage location and damage degree of the boom structure.

Key words: tower crane boom, structural health diagnosis, dual-output single-output ARX model