考虑悬索效应的全地面起重机超起模型研究

发布时间：2018-01-24 14:26

本文关键词： 全地面起重机超起张索预紧角度预紧力悬链线　出处：《大连理工大学》2012年硕士论文　论文类型：学位论文

【摘要】：超起装置是为了提高伸缩臂起重机在变幅平面和回转平面内的承载能力而在吊臂安装的一种支撑装置。作业时通过预紧超起张索使之与超起撑杆和吊臂形成了一个三角形稳定结构,从而改善吊臂的受力状态。国外全地面起重机超起技术相对已经成熟,国内对超起技术的研究还比较少,对超起张索对吊臂性能的影响机理认识尚不清楚,在相关文献中极少有详细论述及研究成果发表,因此在进行全地面起重机研发中无据可依,鉴于此种情况有必要开展这方面的研究。在考虑了超起张索悬索效应的基础上把悬链线理论引入到了全地面起重机超起装置的研究中,根据此理论建立了超起装置的计算模型,对超起装置对主臂影响机理进行了系统深入地研究,主要内容如下： 1)深入研究超起装置的工作原理,鉴于把超起张索简化为二力杆存在的缺陷,本文考虑了超起张索的悬索效应,基于悬链线理论及其基本假设对超起张索进行模型简化和受力分析,建立基于悬链线方程的超起张索的求解模型。 2)研究超起张索有限元模型简化和计算问题,针对超起张索几何非线性大变形特性,本文在研究了超起张索特性和悬链线理论的基础上,用抗弯刚度较弱的梁单元建立了超起张索有限元模型并进行了非线性计算。以此结果与悬链线方程进行了对比分析,并讨论了模型参数对结果的影响,通过算例验证了模型的可行性。 3)阐述了超起张索线形与预紧力和预紧角度的关系,以吊臂整体应力和销孔局部应力为评价准则,通过算例定量地得出了超起张索线形对主臂和超起张索受力影响曲线,在定量结果的背景下论述了影响规律。对结果研究表明,考虑悬索效应的超起张索线形对吊臂性能有着深刻的影响作用,同时研究成果应用到了与企业合作的实际项目——TZQAY500t全地面起重机研发中,为全地面起重机超起装置研发设计提供了理论参考,在工程起重机领域类似结构中具有一定的普遍意义和应用价值。
[Abstract]:An overlift is a support device installed on the boom to enhance the load-carrying capacity of a telescopic jib crane in the variable amplitude plane and the rotary plane. In operation, the overtension cable is used to form an overloaded boom and boom. A triangularly stable structure. In order to improve the mechanical state of the boom. The overlifting technology of all ground cranes abroad has been relatively mature, the domestic research on the super-lifting technology is relatively few, and the influence mechanism of the over-lifting cable on the performance of the boom is not clear. There are few detailed discussions and research results published in the relevant literature, so there is no evidence in the research and development of all-ground crane. In view of this situation, it is necessary to carry out this research. The catenary theory is introduced into the study of the overhoisting device of the whole ground crane based on the consideration of the effect of the overhoisting cable, and the calculation model of the overhoisting device is established according to this theory. In this paper, the influence mechanism of overloading device on the main arm is studied systematically and deeply. The main contents are as follows: 1) deeply study the working principle of the over-lifting device. In view of the defects of simplifying the over-lifting cable to the two-force rod, this paper considers the suspension effect of the over-lifting cable. Based on catenary theory and its basic assumptions, the model of overtension cable is simplified and analyzed, and the solution model based on catenary equation is established. 2) the problem of simplification and calculation of finite element model of overhanging cable is studied. In view of geometric nonlinear and large deformation characteristics of overhanging cable, the characteristics of overhanging cable and catenary theory are studied in this paper. The finite element model of overtension cable is established by using the beam element with weak flexural stiffness and the nonlinear calculation is carried out. The results are compared with the catenary equation and the influence of the model parameters on the results is discussed. The feasibility of the model is verified by an example. 3) the relationship between the line shape of the overtension cable and the pretension force and the pretension angle is expounded. The integral stress of the boom and the local stress of the pin hole are taken as the evaluation criteria. The influence curve of the line shape of the over-rise cable on the main arm and the overtension cable is obtained quantitatively by an example, and the law of influence is discussed under the background of the quantitative results. The results show that the over-tension cable line has a profound effect on the performance of the boom. At the same time, the research results are applied to the research and development of TZQAY500t all-ground crane, which provides a theoretical reference for the research and design of overloading device of all-ground crane. It has certain universal significance and application value in similar structures in the field of engineering crane.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH21

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