Analysis of telescopic beam structure using couple of DOF technique and its application

Couple of DOF technique in FEM and the algorithm for equation group solution in the whole stiffness matrix is studied in this paper.A new procedure is developed for the analysis of telescope beam structure.This method can solve most of the complex structural problems in engineering practice.This method has been used in the FEM analysis of pile frame of multifunction drilling machine,which is designed and manufactured by our research group.The right analysis result can improves the design efficiency and the reliability of the structure and reduce the design cost.     

采煤工作面自动喷雾灭尘控制系统的设计

为了改善矿井采煤工作面环境,设计了一套采煤工作面自动喷雾灭尘控制系统。该系统通过采煤机上搭载的红外发射器和支架上安装的红外接收传感器实现采煤机的定位功能;根据采煤机的位置控制安装在支架上的本安电磁阀喷雾,消除处于采煤机切割头下风方向的粉尘,实现采煤工作面的自动灭尘。实际运行表明,该系统解决了综采工作面架间自动喷雾的技术难题,可对采煤作业时产生的大范围、高浓度粉尘自动实施多道阻隔和高效除尘,降低了粉尘浓度。     

A simple and robust method for essential boundary condition treatments in mesh-less methods

To improve the treatment efficiency of essential boundary condition in mesh-less methods,a simple and robust method is proposed in this paper.Rising weight of nodes in the construction of trail function,specified for essential boundary condition,can make the trail function pass through these nodes.And then,the trail function can satisfy the essential boundary condition previously by setting diagonal element to 1 or multiplying diagonal element by a big number in FEM.The MLS method is adopted to validate this method,and it is proved that this method is costless and robust in most of mesh-less methods.     

数控机床液压系统模糊故障树分析与诊断

利用模糊故障树方法构建了数控机床液压系统故障树,利用统计资料,建立故障集度矩阵,通过推论,确立故障原理隶属度,根据最大隶属度原则确定故障原因。该方法能提高故障诊断效率,为故障诊断专家系统的设计提供一种新的推理方法。     

滚动轴承加工质量与振动的综合分析

考虑到数据信息的不完备和单一研究方法的局限性,采用粗集理论属性重要性分析、模糊集合贴近度分析和灰关联分析,通过试验研究,比较并评价不同性质的加工质量指标对轴承振动的影响程度,找出了各加工质量指标对滚动轴承振动影响较大的因素。这些因素的重要程度排序依次为:内圈沟道曲率半径、外圈沟道曲率半径、内圈沟道形状误差。