Structural Force Analysis and Service Condition Monitoring of a Port Door Machine

Based on the service state of the port door machine, the structural force characteristics are analysed from multiple angles, the optimal online real-time monitoring solution is designed and the real service state of the door machine is given based on the monitoring data. According to the field working condition of the door machine, six typical service conditions of the door machine are summarised according to the wind load, boom extension and lifting weight. The finite element method is used to establish a refined model of the door machine, and the structural stress performance of the door machine under the six operating conditions is analysed comprehensively to find out the weak points of the structure so as to determine the optimal sensor arrangement, and then realise online real-time monitoring of the health information of the working stress and strain of the door machine. The degree of influence of different loads on the stresses of the door machine was obtained. The results show that the most influential load is the self-weight load of the door machine, followed by the crane load of the door machine, while the wind load has less influence on the strain, and the dangerous cross-section of each member of the door machine is located at the member joints. The strain values of the members of the door machine did not exceed the permissible strain of the material according to the actual measurements. The strains in the actual monitoring corresponded to the simulation results, and the monitoring data of all parts of the door machine fluctuated steadily, with no abnormalities in the structural health status, effectively ensuring the safe and stable operation of the door machine.