Crane Frame Inspection Using Metal Magnetic Memory Method

Abstract

The large industrial cranes carry out transportation operations in the presence of a large impact load and mechanical stresses acting on the crane's structure. The safety and efficiency of crane operations can be improved through providing the continuous structural health monitoring of crane's equipment and components. Advanced nondestructive techniques can be employed for inspection of cranes during operation, that leads to reduce the down time costs and increase the safety confidence in the monitoring process. Magnetic flux leakage methods of non-destructive inspection are widely utilized in identification of damaged areas in steel structures. However, the traditional magnetic flux leakage techniques are more appropriate in detecting cracks, but not sensitive to the detection of micro-defects. Metal magnetic memory is a relatively novel method of detecting the micro-damage in ferro-magnets due to the stress concentration. This method proved its effectiveness in early identification of the possible defect location. However, the method is preferable to off-line inspection due to the presence of operational variations in on-line measurements that can cause false indications of damage. In this paper, the problem of continuous inspection of crane's frame using the metal magnetic memory method is considered. The influence of operational variations on the self-magnetic flux leakage signal is investigated and quantitatively analysed based on the experimental results obtained on a laboratoryscaled overhead travelling crane.

Integrated Supervision for Supporting Control and Proactive Maintenance of Material Handling System

“…Their abnormal changes are observed on local stress concentration zones where a significant deformation is present due to an unsuitable combination of component features, structural heterogeneity, and workloads [2]. As the advanced non-destructive technique, which does not require the use of a special magnetizing device, this method can be reliable alternative to classic methods used for crane's inspection [7][8][9]. The MMM NDT can be employed for inspection of crane structure during operation (continuous monitoring), that can lead to reduce downtimes and increase the safety confidence in the monitoring process.…”

“…At this point, the HPx riches the extreme value (above -4000 A/m), and the HPy changes its polarity. More details and analysis of the experimental results is delivered in [9].…”

Magnetic Memory Inspection of an Overhead Crane Girder – Experimental Verification

“…Identification of damages occurring in a steel rope using residual magnetic field method reported in [6] can be successfully employed in crane's hoisting equipment diagnostic to enhance safety, predict and localize damage, and plan maintenance. Possibility of a real-time monitoring of a crane's structure using the MMM NDT and results of experiments carried out on the laboratory stand are discussed in [7,8,10].…”

Archives of Mining Sciences

“…Many years of research also concerned crane beams, drive shafts for mechanical presses, support structures for high-voltage pylons. In the paper (Kosoń-Schab et al, 2016), the problem of continuous inspection of crane's frame using the metal magnetic memory method is considered. The influence of operational variations on the self-magnetic flux leakage signal is investigated and quantitatively analysed based on the experimental results obtained on a laboratory scaled overhead travelling crane.…”