矿井多绳摩擦式提升机安全高效更换首绳研究与应用

本文通过对河南能源集团永煤公司陈四楼煤矿首绳更换方案的优化,利用井架下天轮平台的 SQY 型首绳起重装置,不需要安装凿井绞车,人员不需要下井施工,实现了矿井多绳摩擦式提升机首绳的安全高效更换。     

1×7＋IWS结构钢丝绳有限元分析

为提高钢丝绳的安全性,最大限度发挥材料性能,合理地设计和制造满足各种性能要求的钢丝绳产品,采用UG软件对1×7＋IWS结构的圆股钢丝绳进行三维实体建模,然后通过UG与ANSYS的接口导入ANSYS中。采用面-面接触求解方法,对导入的钢丝绳实体进行有限元网格划分、建立接触对和施加约束并求解。研究了捻距S对服役中的钢丝绳应力应变的影响,得到相应的应力应变云图,为钢丝绳的设计和改进提供了理论依据。     

一种高稳定积分器在钢丝绳无损检测中的应用

为了对在役钢丝绳进行了定量无损检测,以提高钢丝绳的安全性,针对钢丝绳检测信号的特点,设计了具有非线性负反馈的高稳定积分电路,并对该积分电路进行了理论分析和计算,仿真实验和现场检测结果表明,该电路对外界干扰以及由运算放大器自漂移产生的影响有很强的抑制作用,并能够长时间稳定工作,适用于钢丝绳定量无损检测。     

碳纤维绳材试验研究与分析

FRP筋由于已完成固化,不易改变形状;FRP筋的弯折损伤又会造成强度折减,因此FRP筋不利于布置为体内曲线预应力筋.纯纤维绳没有经过树脂固化工序,具有模量高、强度高、抗折能力强等特点,可用于结构中为混凝土施加预应力.本文基于平行布置碳纤维绳展开,分析了其强度性质和试验表现,通过纤维绳试件拉伸强度试验总结得到:两端固化中间自由的纤维绳,其破坏均在固化界面;试样纤维强度利用率较低,但细试件要高于粗试件.纤维绳拉伸试验中,受固化界面的影响,绳子破坏强度低于其计算值.欲提高纤维强度利用效率,需改进绳的生产工艺和张拉锚固技术.     

钢丝绳动载荷疲劳时的磁记忆信号研究

建立了模拟钢丝绳动载荷疲劳的实际工作状态的实验装置,确定了钢丝绳上三个检测段.通过磁记忆检测方法检测不同检测段的磁场分布,然后对发生疲劳断裂的检测段的磁场强度变化进行分析,从而得到钢丝绳动疲劳时磁记忆信号的特点.     

New benchmark problems for verification of the curve-to-surface contact algorithm based on the generalized Euler–Eytelwein problem

Development of the numerical contact algorithms for finite element method usually concerns convergence, mesh dependency, etc. Verification of the numerical contact algorithm usually includes only a few cases due to a limited number of available analytic solutions (e.g., the Hertz solution for cylindrical surfaces). The solution of the generalized Euler–Eytelwein, or the belt friction problem is a stand alone task, recently formulated for a rope laying in sliding equilibrium on an arbitrary surface, opens up to a new set of benchmark problems for the verification of rope/beam to surface/solid contact algorithms. Not only a pulling forces ratio ${\displaystyle \frac{T}{T_0}}$, but also the position of a curve on a arbitrary rigid surface withstanding the motion in dragging direction should be verified. Particular situations possessing a closed form solution for ropes and rigid surfaces are analyzed. The verification study is performed employing the specially developed Solid-Beam finite element with both linear and $C1$-continuous approximations together with the Curve-to-Solid Beam (CTSB) contact algorithm and exemplary employing commercial finite element software. A crucial problem of "contact locking" in contact elements showing stiff behavior despite the good convergence is identified. This problem is resolved within the developed CTSB contact element.     

高噪下的钢丝绳断丝定量检测

研究高噪情况下的钢丝绳断丝定量检测信号处理。利用时域与频域相结合的处理算法实现断丝的特征提取，采用这些方法对高噪下的钢丝绳磁检测信号进行处理，能够清楚地区分噪声和损伤信号。该方法运算量小，适合于实时在线的钢丝绳检测。     

Finite element simulation of fretting wear and fatigue in thin steel wires

This paper studies the effect of fretting on fatigue life reduction of thin steel wires, using the frictionally-induced multiaxial contact stresses obtained from a finite element wear model, validated in previous work. The fatigue life prediction model uses a critical-plane SWT approach in a 3D crossed cylinder problem. A new damage accumulation methodology for the adaptive mesh simulation, based on the cyclic material removal, has been developed. Four methods (Manson’s universal slope, Muralidharan modified universal slopes, medians and fatigue S–N curves) for estimation of the fatigue coefficients of the wire have been used. Manson’s method and medians method give lives closer to those obtained from fretting wear tests in thin steel wires. The other methods are more conservative. The methodology predicts correctly the life reduction of this component due to the increase of normal load (contact pressure), while it is not clearly predicted that an increase of the stroke reduces the life of these components as shown in the experimental testing. Guidelines for developing a more robust methodology are proposed.     

YB／T 5359《压实股钢丝绳》标准修订情况介绍

介绍《压实股钢丝绳》标准修订过程和主要的修订内容;新标准在标准名称、钢丝绳分类、典型结构的标记代号、破断拉力、钢丝绳的抗拉强度、钢丝表面状态、数值修约等方面的内容进行了修订。全面采用国外标准,进一步提高我国标准水平,尽可能满足用户要求,推动企业管理水平的提高是修订、起草新标准的基本原则。