| With the development of production and industrial technology, container crane is becoming high-speed and high-power, and its risen capacity is being enhanced, consequently, vibration becomes more severe. Vibration problems have bad effects on crane's performance and comfort of operators, so it's very important to research on anti-vibration of container cranes. The dissertation works on machinery house, fixed tie link and boom, which vibrate most severely on the container crane.By using Rotor Dynamics, the dissertation got the conclusion that the reason of machinery house's vibration is that the exciting force on electromotor is too heavy, the rotor shaft is too thin, and the transversal stiffness of motor support is too low. Enhancing the transversal stiffness of motor support can reduce the vibration. Two softwares were programmed using Visual Basic by two ways: simplifying the motor-sopport system into a single degree-of-freedom system, and finite element method. The two softwares are to analyse motor support's vibration, so that designers can get the effect of changing support's geometry parameters, and resonance could be avoided during the phase of design.Aerodynamics was used to study on the vibration-by-wind principles of fixed tie link. Fixed tie link's stability is decided by its natural frequency, damping and shape. The dissertation analysed and compared ways of vibration control, and worked out optimal parameters of wind interference unit. Suggestions were put forward: optimize parameters of helix plate, fix interference rib, improve constraint of the rod's ends, and increase cables of different directions.As to the boom, rubber spring was suggested as an elastic support. ANSYS was used to model the boom, caculate and compare its dynamic traits when non-clearance, clearance, and elastic supported. Such conclusion was drawn: When rubber spring's length is 20mm～30mm; and its Shore hardness number is 40～60, the boom's vibration is reduced most effectively. The displacement peak value decreases 10% compares with which when clearance supported. The boom's 1st and 3rd set natrual frequency which show its horizontal vibration are larger, especially the 3rd set, which increases 17%.The anti-vibration methods brought up in the dissertation were based on theoretical analysis and computer emulation. They are innovative, easy and applicable in the project. And further research direction was indicated. |
