采用空间薄壁板壳元与空间梁元混合离散模型对大吨位起重机钢丝绳缠绕卷筒进行有限元分析，将有限元方法与进退法优化方法耦合形成数值算法进而对卷筒进行优化设计。
The numerical method represents a coupling between the optimum method of advance and retreat and the finite element analysis for the design on large hoist drums of cranes that is an actual structure.
卷筒上钢丝绳必须缠绕排列整齐，不得乱绳。
这种钢丝绳沿滚筒松开和缠绕引起游动滑车从井眼内下降或上升，无论游动滑车下面悬挂的是什么东西。
This reeling out and in of the drilling line causes the traveling block, and whatever may be hanging underneath it, to be lowered into or raised out of the wellbore.
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