7500 t浮吊回转支承轮压仿真计算与实测验证

针对7500 t全回转浮吊在回转带载工况下滚子夹套式回转支承的多轮轮压分布问题,采用有限元仿真分析法计算并得到了轮压最大值及其分布规律.在主钩幅度为42 m、最大额定起升载荷4 000 t工况下,回转支承轮压达到最大值164.5 t.各种工况下,轮压随起升载荷的增大而线性增大.在前承轨梁下轮压分布呈"双驼峰"曲线,后承轨梁下轮压分布呈"M"型;轮压分布规律与回转支承上部结构的布置形式有直接关系.利用应变式间接测量法现场实测了回转工况下的轮压值,实测结果与仿真计算结果较吻合,验证了仿真计算方法和应变式间接测量法的可行性.文中所确定的轮压值及其分布规律可为浮吊结构设计和优化提供依据,所采用的有限元仿真计算与应变式间接测量相结合的研究方法与思路亦可为其他起重机械的多轮轮压分布问题所参考.

Wheel pressure simulative calculation and actual messuring verification of 7500 t floating crane turning support

Aimed at the multi wheeled pressure distribution problems of roller clip-jacket typed turning around support of 7500t full circle swinging floating crane under the working condition of turning around with load, the wheel pressure and its distribution law were obtained by adopting the calculation of finite element simulation method. Under the working conditions of the main hook range to be 42m and the maximum rated hoisting load to be 4000t,the wheel pressure of turning around support reaches a maximum value of 164.5t.Under every kind of operating conditions, the wheel pressure would make a linear increase along with the increment of hoisting load. The wheel pressures distribution under the front track girder presented a "double hump" curve while that of the back track girder was like an M curve. The distribution law of wheel pressure has a direct relationship with the collocation shape of upper structures of turning around support. Utilizing the strain typed indirect measurement method a field measurement was made on the wheel pressure under the operating condition of turning around which showed the measured result was rather tally with the result of simulated calculation. The feasibilities of simulative calculation method and strain typed indirect measurement method were validated. The wheel pressure value and its distribution law assured in this paper could provide basis for the design and optimization of floating crane structures. The being adopted researching method and train of thought of the combination of finite element simulative calculation and strain typed indirect measurement can be a reference for the distribution problems of multi-wheeled wheel pressure of other hoisting machineries.