具有柔性牵索的起重机伸缩式组合臂架稳定性研究

发布时间：2018-04-14 09:36

本文选题：全地面起重机 + 组合臂架　；参考：《哈尔滨工业大学》2012年硕士论文

【摘要】：伴随着风电、核电等大型项目的深入发展及对整体吊装作业的要求，全地面起重机的臂架系统朝着大型化、复杂化方向发展，以满足工程大重量、大作业幅度工作的需求。具有超起装置的起重臂具有良好的起升性能，但由于结构复杂，，其稳定性分析计算已成为国内大型伸缩臂发展的技术难点，而具有超起装置的伸缩式组合臂架的稳定性分析更是国内大型组合吊臂发展的瓶颈，极大的制约了国内对大型臂架系统设计的优化水平。目前为止，国内尚无可直接应用于指导工程设计的相关研究成果。本文将致力于对具有超起装置起重臂及伸缩式组合臂架的整体稳定性研究做初步的探索，以期抛砖引玉，为我国工程机械的发展做出些许有益贡献。提出了具有对称双拉杆作用的起重臂平面外稳定性计算方法及计算公式，通过分析临界失稳条件下对称双拉杆引起的空间非保向力作用，建立吊臂的挠曲微分方程，引入适当的边界条件和参数处理方法，获取起重臂平面外失稳特征方程，并进一步分析了对称拉杆张角对起重臂平面外稳定性的影响。结果表明，吊臂在对称双拉杆作用下的平面外稳定性高于单拉杆作用，增大两拉杆夹角可以显著提高吊臂的平面外抗失稳能力。提出了具有空间双拉绳超起装置起重臂的整体稳定性计算方法及计算公式，通过建立适当的力学分析模型，阐述了具有超起装置起重臂的平面外稳定性计算方法，并在考虑空间双非保向力及超起撑杆侧向刚度共同作用下建立吊臂临界条件下的平面外挠曲微分方程，采用适当的参数处理方法得到吊臂的平面外失稳特征方程，并进一步探讨超起装置结构参数对吊臂系统稳定性的影响，为工程中结构设计分析提供参考。研究伸缩式组合臂架的平面外整体稳定性问题，通过分别建立主臂和副臂在临界状态下弯曲和扭转变形微分方程，根据主臂和副臂的变形协调条件，得出组合臂架在主臂根部固定副臂端部自由状态下的平面外失稳特征方程。
[Abstract]:With the further development of wind power, nuclear power and other large-scale projects and the requirements of the whole lifting operation, the boom system of the whole ground crane is developing towards the direction of large scale and complexity, in order to meet the needs of the large weight and large work of the project.The hoisting arm with overloading device has good lifting performance, but because of its complex structure, its stability analysis and calculation has become a technical difficulty in the development of large telescopic arm in China.The stability analysis of the telescopic combined boom with overloading device is the bottleneck of the development of the large combined boom in China, which greatly restricts the optimization level of the design of the large boom system in China.Up to now, there are no related research results that can be directly applied to guide engineering design in China.This paper is devoted to the preliminary study of the overall stability of the lifting arm and the telescopic combined boom with a super lifting device in order to make some useful contributions to the development of construction machinery in China.In this paper, the calculation method and formula of the out-of-plane stability of the cantilever with symmetrical double pull bar are presented. By analyzing the spatial non-conformal force caused by the symmetric double pull bar under the critical instability condition, the differential equation of deflection of the boom is established.An appropriate boundary condition and parameter processing method are introduced to obtain the characteristic equation of the out-of-plane instability of the lifting arm, and the influence of the tension angle of the symmetrical pull bar on the out-of-plane stability of the boom is further analyzed.The results show that the out-of-plane stability of the boom is higher than that of the single pull bar under the action of symmetrical double strut, and the out-of-plane stability of the boom can be improved significantly by increasing the angle between the two rods.This paper puts forward the calculation method and formula of the whole stability of the lifting arm with space double rope overhoisting device. By establishing the appropriate mechanical analysis model, the calculation method of the out-of-plane stability of the lifting arm with the overlift device is expounded.Under the combined action of spatial double non-conformal force and lateral stiffness of the cantilever, the differential equation of out-of-plane deflection under the critical condition of the boom is established, and the characteristic equation of the out-of-plane instability of the boom is obtained by using the appropriate parameter processing method.Furthermore, the influence of structural parameters on the stability of boom system is discussed, which provides a reference for structural design and analysis in engineering.In this paper, the out-of-plane global stability of the telescopic combined boom is studied. By establishing the differential equations of bending and torsional deformation of the main arm and the accessory arm in the critical state respectively, according to the deformation coordination conditions of the main arm and the accessory arm,The characteristic equation of out-of-plane instability of the combined arm is obtained under the free state of the end of the forearm fixed at the root of the main arm.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH213

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