根据起重机抓斗的受力分析，建立了起重机水平运行与抓斗摆动关系的数学模型。
According to the mechanical analysis of bridge crane's grab, the mathematical model between crane's horizontal movement and grab swing is established.
通过对类似塔式起重机塔身的悬臂格构式结构的受力分析，引入了这类悬臂结构端部水平位移的便捷算式。
By means of analyse to the cantilever lattice structure such as crane body, a simple algorithm is introduced.
通过试验和理论分析厚、扁螺母在紧固过程中的受力情况，并从试验结果得到一个较合理的厚螺母拧紧力矩，既能保证塔式起重机的安全运行，又能延长螺栓的使用寿命。
Changing the positions of thin and thick nuts and using the right thick nut tightening torque ensure safe operation of the crane and longer lives of the screws.
通过试验和理论分析厚、扁螺母在紧固过程中的受力情况，并从试验结果得到一个较合理的厚螺母拧紧力矩，既能保证塔式起重机的安全运行，又能延长螺栓的使用寿命。
Changing the positions of thin and thick nuts and using the right thick nut tightening torque ensure safe operation of the crane and longer lives of the screws.
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