Research of Portal Crane Vibration Modal Analysis

摘要

Portal crane is an important port production machinery what frequently work in moist environment leads to greater structural damage. The weight of the metal structure is usually 60% to 90% of the whole weight. Steel Q235B material in the early is widely used in the portal crane design and manufacture. For more than a certain number of service life period of portal crane, it is necessary to do safety assessment to reflect their state of health. The traditional safety assessment cannot reflect the structure of the health portal crane vibration state, therefore, vibration testing was added to the portal crane fault diagnosis technology in the present study, which use ambient vibration modal analysis to test a portal crane, and acquired abnormal vibration signals, it is improve the safety assessment system, achieved the good test results.