【作者】 赵萍；

【导师】 王慧；

【作者基本信息】 济南大学 ， 机械工程（专业学位）， 2017， 硕士

【摘要】 编织型钢丝绳因其不旋转特性作为牵引绳被广泛应用于张力架线施工中,成为施工必备且重要的工器具之一,其力学性能分析对安全施工至关重要。分析张力架线过程表明,钢丝绳在经过牵引卷筒时,其受力状况最为复杂且是最易发生危险的位置之一,由于卷筒的牵引卷绕作用,钢丝绳受到拉、弯、扭、压等力的复合作用,因此,有必要基于牵引工况对编织钢丝绳卷绕弯曲状态下的力学特性进行研究。本文以四方八股编织钢丝绳为例,对其进行弯曲状态下的数学模型构建,以钢丝绳经过牵引卷筒时的弯曲受力状态为工况,进行其弯曲状态下的应力及变形分布探究。具体研究内容如下:针对四方八股编织钢丝绳,分析其在平直状态下的空间结构及绳股、钢丝之间的相位关系,探讨其处于弯曲状态时绳股及股内钢丝在整绳中的位置变化,确定该状态下绳股及钢丝之间相关参数之间的关系,通过坐标变换及微分学理论建立其弯曲状态下绳股及股内钢丝的螺旋线方程,即卷绕弯曲状态数学模型。在此基础上分析其几何特征,借助MATLAB软件计算并获得编织钢丝绳弯曲状态下绳股及侧线钢丝的曲率变化特性。基于四方八股编织钢丝绳弯曲状态下的数学模型,以YS9-8×19编织钢丝绳为例,在三维软件SolidWorks中建立其卷绕弯曲状态下的几何模型,同时建立牵引卷筒的简化几何模型,进而组合完成“绳-轮”牵引卷绕系统整体模型的建立。根据张力架线实际工况,确定数值模拟的载荷及约束,完成“绳-轮”牵引卷绕系统的有限元模型构建并进行数值模拟。分析数值模拟结果,获得拉伸力作用下编织钢丝绳绕过牵引卷筒时钢丝绳绳股应力及变形的分布规律;通过不同摩擦系数设置,仿真分析摩擦系数对其弯曲状态应力及变形的影响;同时对不同节距下的模型进行模拟,获得不同节距、同种边界条件下钢丝绳卷绕弯曲状态应力分布,并分析确定该工况下最佳钢丝绳节距。以YS9-8×19编织钢丝绳为例,对其进行卷绕弯曲状态拉伸试验。试验从定性和定量分析的角度确定两种方案,定量分析通过将同种载荷下的弯曲拉伸试验伸长量与模拟伸长量进行对比;定性分析则是将编织钢丝绳卷绕弯曲状态拉伸试验所出现的断裂位置与其卷绕弯曲状态数值模拟所得到的应力最大点位置相比较。通过上述试验,验证编织钢丝绳卷绕弯曲状态数学模型及几何模型的合理性,以及“绳-轮”牵引卷绕系统数值模拟的可行性。更多还原

【Abstract】 Braided wire rope is widely used in the construction of tension stringing because of its non rotating characteristics.It has become one of the necessary and important tools in construction and the analysis of its mechanical properties is very important for safe construction.Analysis of tension stringing process show that the wire rope after traction drum,It is one of the most dangerous locations where the stress is the most complex.Due to the traction and winding of the drum,the wire rope is subjected to the combined action of tension,bending,torsion and compression.Therefore,it is necessary to study the mechanical properties of the braided wire rope under the bending condition.In this paper,four eight strand braided wire rope were taken as an example,the construction of mathematical model of bending condition were established,When the wire rope passes through the traction drum,the bending stress state is taken as the working condition,through the numerical simulation,the stress and deformation distribution of the wire rope passing through the bending state of the traction drum is studied.Specific research contents are as follows:According to the four eight strand braided wire rope,analysis the phase relationship between the spatial structure and ropes,in the flat state under the wire,explore the bending state of wire rope winding in stocks and shares in the rope in the position change,determine the relationship between the relevant parameters and between the strands of this state.Based on the theory of coordinate transformation and differential calculus,the spiral line equation of wire rope and strand in bending state is established.On the basis of the analysis of the geometric characteristics,the MATLAB software is used to calculate and obtain the curvature variation characteristics of the strand and the side line steel wire.Based on the mathematical model of eight strand braided wire rope under bending state,Taking the YS9-8×19 braided steel wire rope as an example,the geometric model of the bending state is established in the three-dimensional software SolidWorks,and the simplified geometric model of the traction drum is established at the same time,and then set to complete the "rope-wheel" traction winding system model.According to the actual condition of tension stringing,the load and constraint of numerical simulation are determined,and the finite element model of the rope wheel traction winding system is constructed and simulated.Byanalyzing the numerical simulation results,the distribution law of the stress and deformation of the wire rope strand is obtained under the action of tensile force;At the same time,the stress distribution of the steel wire rope under the condition of different pitch and the same boundary condition is obtained by simulating the model with different pitch.Taking the YS9-8×19 braided steel wire rope as an example,the tension bending test was carried out.The test to determine the two schemes from the perspective of qualitative and quantitative analysis,quantitative analysis of the amount of bending tensile test under the same load elongation and simulated elongation were compared;qualitative analysis is obtained by numerical simulation of fracture position and winding bending braided wire rope winding will be bending tensile tests of the maximum stress position point comparison.Based on the above tests,the rationality of the mathematical model and the geometric model of the braided wire rope winding is verified,and the feasibility of the numerical simulation of the wire rope traction system is discussed.更多还原