Electric overhead travelling cranes (EOT) are one of the most commonly used cranes in manufacturing industries to move heavy objects across parallel runways. As the name suggests, these are electrically operated and typically have single or double girders (bridges) that span the gap between the runways. The whole crane assembly can travel horizontally along the runways carrying a hoist that can lift and lower heavy loads. Based on the load and application, each crane is designed with a specific lifting speed, travel speed and span length.
TATA Steel Limited engaged NV Dynamics to undertake vibration analysis on one of these type of EOT cranes to determine the root cause of reported perceived vibrations in the operator cabin. To accurately evaluate the dynamic behavior of the crane and identify any sources of excessive vibrations, a comprehensive testing procedure was followed. Multiple vibration response tests were conducted on the crane operator cabin to analyze its frequency and generate operational deflection shapes for loaded conditions to assess its dynamic behavior during regular operation.
In addition to the vibration response tests, impact-based tests on the crane girders were also conducted to assess the natural frequencies and co-relate them with the operating frequencies of the crane. The root cause for the operator cabin vibrations was identified and their respective observations were reported.
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