Effect on tower crane structural vibration under the lifting-luffing coupling condition

The present research aims to investigate parametrically the structural vibration analysis of tower crane under the lifting-luffing coupling condition. Structural vibration greatly affects tower crane stability. The structural dynamics of a crane should be considered for studying motion behavior and vibration feature. The dynamic model of the tower crane is presented based on air resistance, boom deflection, and Lagrange equation under the lifting-luffing coupling condition. The vibration model of the tower crane was validated by an experiment. The experiment was conducted with an accelerating speed until reaching the constant speed and then with decelerating speed. This study analyses structural parameters to acquire the dynamic characteristics and vibration features of the tower crane under the compound working condition. The vibration responses of the mast and the boom are studied with frequency- and time-domain indicators. Results show that payload mass, luffing acceleration, boom length, mast height, and girder length significantly influence the mast vibration. In comparison, payload mass, trolley acceleration, and boom length affect the boom vibration. This research can improve the design of a dynamic system for tower crane safety.