对于变幅起重机，一定的幅度只允许起吊一定的吊重，如果超重，起重视就有倾翻的危险。
To a certain extent luffing crane, lifting the lifting only allowed, if overweight, attention has danger of tipping.
在分析影响起重机金属结构疲劳载荷情况的基础上，给出了起重机主梁起吊过程中不同阶段的动力学模型。
The paper builds the models at different stages of lifting operation on the basis of analysis of loads influencing crane structure fatigue.
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