Structural defect recognition of a single main beam gantry crane based on moving load method

ZHAO Jun1, ZHONG Shuncong1, YANG Xiaoxiang1, GUO Jinquan1, GONG Lingzhu2

(1. School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108, China;

2. Fujian Institute of Special Equipment Inspection, Fuzhou 350001, China)

Abstract: Aiming at recognizing the structural defect of gantry crane, the moving load method was investigated. The threedimensional model of a single main beam gantry crane was established with UG, then the finite element model of this crane was formed and mashed with Ansa. Finally, a condition that an object in mass of 100kg moving along the main beam of the crane was simulated with ANSYS, under this condition, natural frequency curves in specific vibration modes of four models with different defect sizes were obtained. The results indicate that the sizes of deferent detects and the distance between the moving load and the detects are two key factors that affect the natural frequencies in specific vibration modes of this crane, this result provides an important basis for nondestructing testing and evaluation of the crane.

Key words: single main beam gantry crane; finite element analysis; natural frequency; structural defect recognition