Dynamic Characteristic Analysis of Girder Hoisting Machine Structure Based on Linear Stiffness Ratio

Research purposes;Large- tonnage girder hoisting machine often need to be transformed to meet the engineering environment.The dynamic characteristic change is easily ignored in the conventional transformation,resulting in unnecessary engineering accident.Therefore,based on the linear stiffness ratio of girder hoisting machine leg and main girder line,the influence law of the leg height on dynamic characteristics was systematically analyzed so as to offer the reference for transform and design of the girder hoisting machine.Research conclusions:(1) The longitudinal and lateral dynamic characteristics are sensitive to the change of linear stiffness ratio of girder hoisting machine leg and main girder line,the change of the linear stiffness ratio will cause the significant changes of the vibration frequency and vibration model.(2) The vertical dynamic characteristics are not sensitive to the change of linear stiffness ratio,but are sensitive to the change of vertical load.(3) To ensure the operation safety of the girder hoisting machine,the dynamic coefficient of lifting must be researched in the process of the transformation.(4) According to the practical engineering for analysis,the research results is suitable for the girder hoisting machine transformation and new equipment design and development.