生箔机的张力控制

对生箔机在铜箔生产过程中的铜箔张力进行动态分析,揭示出转矩、铜箔张力、实时卷绕半径之间的关系.建立锥度张力控制数学模型,提出锥度张力控制策略,并对其积分分离PID控制算法进行仿真,结果证明,该控制策略可以有效地避免积分的积累.     

SM45立式球磨机结构的改进

介绍球磨机的结构和工作机理，指出球磨机存在的问题，并对其轴封、轴头、进气口、吸料口等进行了技改，以提高设备的运行周期，满足生产需求。     

Measurement uncertainty evaluation of conicity error inspected on CMM

The cone is widely used in mechanical design for rotation, centering and fixing. Whether the conicity error can be measured and evaluated accurately will directly influence its assembly accuracy and working performance. According to the new generation geometrical product specification(GPS), the error and its measurement uncertainty should be evaluated together. The mathematical model of the minimum zone conicity error is established and an improved immune evolutionary algorithm(IIEA) is proposed to search for the conicity error. In the IIEA, initial antibodies are firstly generated by using quasi-random sequences and two kinds of affinities are calculated. Then, each antibody clone is generated and they are self-adaptively mutated so as to maintain diversity. Similar antibody is suppressed and new random antibody is generated. Because the mathematical model of conicity error is strongly nonlinear and the input quantities are not independent, it is difficult to use Guide to the expression of uncertainty in the measurement(GUM) method to evaluate measurement uncertainty. Adaptive Monte Carlo method(AMCM) is proposed to estimate measurement uncertainty in which the number of Monte Carlo trials is selected adaptively and the quality of the numerical results is directly controlled. The cone parts was machined on lathe CK6140 and measured on Miracle NC 454 Coordinate Measuring Machine(CMM). The experiment results confirm that the proposed method not only can search for the approximate solution of the minimum zone conicity error(MZCE) rapidly and precisely, but also can evaluate measurement uncertainty and give control variables with an expected numerical tolerance. The conicity errors computed by the proposed method are 20%-40% less than those computed by NC454 CMM software and the evaluation accuracy improves significantly.     

给定锥度的锥形度最小二乘评定法

给出了圆锥面锥形度的定义，介绍了给定锥度的锥形度最小二乘评定计算方法。     

圆锥度误差的评定方法与优化算法

论述了圆锥度误差的基本概念和两类典型的评定方法,介绍了几种求解圆锥度误差的优化算法及其优缺点。     

Estimation of train derailment probability using rail profile alterations

Investigation of train derailment is a complicated job that occurs in special points with special characteristics. It depends on several variables so for successful predication, exact estimation of all effective parameters is required. Instead of this complicated job, usually a time history of variables and statistic distribution can be used. According to statistic distributions, exact determination of train derailment is practically impossible and therefore a probability function should be utilised. Angle of wheel flange, friction coefficient, axle load and train speed are effective parameters in investigation of train derailment probability. In this paper, by using statistical distributions, aforementioned parameters are investigated and derailment probability is calculated using reliability theory. To describe extra capabilities of model, derailment probability is calculated in three different curves of railway network considering real geometrical specifications of curves, amount of wear in rail profiles measured by EM120 track recording cars, axle load and operation speed.     

挤压地层双护盾TBM与围岩相互作用影响因素分析

为了研究LDP位移释放率、扩挖量、护盾锥度、护盾长度和侧压力系数等因素对双护盾TBM与围岩相互作用的影响,采用FLAC3D建立了三维TBM模型,在考虑护盾与围岩不均匀间隙的条件下研究了TBM作用下上述因素对围岩变形、接触挤压力大小及分布和护盾所受摩阻力的影响。同时定义了LDP曲线的位移释放率,得出应力释放率超过特定值时对LDP曲线释放率和TBM护盾阻力的影响显著,而且针对特定工程地质条件应做其敏感度的预分析;不均匀间隙自下而上逐渐闭合导致围岩与护盾逐渐发生接触,前后盾尾受力最为显著;前后护盾摩阻力及总摩阻力均与扩挖量呈线性递增关系,适当增加扩挖量可以有效减小护盾阻力;护盾摩擦力与护盾长度呈线性递增关系;当增加护盾锥度时,刀盘及前盾摩阻力缓慢增加,后盾摩擦力减小较为明显,护盾总摩擦力也减小;侧压力系数超过1.2时对刀盘、前盾及后盾上的摩擦阻力影响显著。以上研究成果对于进一步认识和研究TBM与围岩相互作用及后续预测卡机有着重要参考意义。     

轮胎结构不对称性对其力学特性建模的影响

轮胎因其结构不对称性导致的胎体锥度及帘布层转向效应,显著影响轮胎的力学特性。对于某一轮胎的试验数据,考虑胎体锥度及帘布层转向效应,是建立正确的经验及半经验轮胎力学特性模型的关键。本文对胎体锥度及帘布层转向效应进行了深入分析,提出了胎体锥度及帘布层转向效应等效处理及相应的试验辨识方法。指出轮胎模型的有效输入,是研究轮胎结构不对称性对其力学特性建模影响的有效方法。     

阵列群小孔活动模板电解加工技术研究

针对航空发动机阵列群小孔薄板零件,提出了活动模板电解加工方法。介绍了活动模板电解加工的原理和工艺过程。研究了电解液类型、电解液压力、电压占空比等参数对群孔加工品质的影响,研究表明:采用10%w.t.NaNO3,10%w.t.NaCl混合溶液,低电压占空比,合适的电解液压力可以获得表面品质完好、尺寸精度高的阵列群小孔。     

板坯连铸结晶器调宽控制系统

介绍了攀钢2#板坯连铸机INMO型直结晶器调宽控制系统,对系统的组成、功能、调节原理及实现作了阐述。该调宽系统在稳定的操作状态下控制精度能达到±0.1mm,系统的应用增强了连铸机的适应性,提高了铸机作业率,为攀钢三期工程建设顺利达产提供了保障。