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本文将质点弹簧系,有限元法及连续体模型有效地组合后建立力学模型,用数学式表示龙门起重机结构的变形曲线,采用静态凝缩法求得等效质量和等效弹簧常数,对龙门起重机的离地起升、下降、落比、小车运行及其联合动作进行了动态模似解析及动应力计算,理论与实验结果一致,首次探明了龙门起重机的动态特性及其影响因素.本研究关于龙门起重机的水平、垂直方向变位的有关系数及由此而确立的决定水平、垂直静变位的方法,可供设计者参考.另外,关于货物偏移角对结构最大应力的影响等结论,可做为国内外起重机设计规范讨论时的基础资料.
In this paper, the mass spring system, the finite element method and the continuum model are effectively combined to establish the mechanical model, the deformation curve of the gantry crane structure is expressed by the mathematical formula, the equivalent mass and the equivalent spring constant are obtained by the static condensation method, Dynamic simulation analysis and dynamic stress calculation of crane lifting, falling, falling ratio, trolley operation and their joint action are carried out. The theoretical and experimental results are consistent with each other, and the dynamic characteristics of gantry cranes and their influencing factors are firstly ascertained. Research on the gantry crane horizontal and vertical displacement of the relevant factors and the resulting decision to determine the level of vertical static displacement method for the designer’s reference.In addition, the cargo offset angle on the structure of the maximum stress and so on Conclusion, can be used as a discussion of the domestic and international crane design specifications when the basic information.