某和谐号动车组运营中轮对内侧距变化规律研究

轮对内侧距是保证动车组运营中动力学性能稳定和运营安全的重要参数.通过该参数的大样本分析发现,运营中的某和谐号动车组轮对内侧距存在明显的变化规律,轮对微动、轮辋碾宽、辐板微变形等因素是引发轮对内侧距变化的主要原因.为保证动车组正常、安全运营,轮对运用修及高级检修时,需按要求检测轮对内侧距,超出标准要求时应及时更换轮对或对...     

一种变轨距轮对用轴套设计

文章针对变轨转向架运用中对轮轴的功能需求,从结构设计、技术参数及强度计算等方面介绍了一种变轨距轮对用轴套。这种轴套安装在车轮上,用于实现车轮的轴向移动和锁紧,从而实现转向架的变轨距功能。     

客车轮对故障统计分析与改进建议

对客车轮对踏面剥离和圆周磨耗故障情况进行了分析,认为踏面制动形式的转向架其轮对故障以圆周磨耗为主,盘形制动形式的转向架其轮对故障以踏面剥离为主。     

Nonlinear dynamic behaviour of a railway wheelset

Nonlinear dynamic systems are well known to contain certain characteristic additional phenomena compared with linear systems. One example is the fact that nonlinear systems can have multiple stable solutions for one set of parameters. In that case, which one of the multiple stable solutions will be realised will depend on the initial conditions. From the domains of initial conditions which are domains of attraction, probabilities of occurrence of the stable solutions can be calculated. The described dynamical behaviour is studied in the present paper using two examples. To introduce the basic phenomena, the well-known academic Duffing oscillator with harmonic excitation is considered. Domains of attraction are shown for the two stable solutions and the probability of occurrence of the two solutions in the case of equally distributed initial conditions is calculated. The main example to be considered in this paper is the railway wheelset, which is known to show (depending on the nonlinearities in the model) a subcritical Hopf bifurcation depending on the vehicle speed. In that case a range of speeds exists, where a stable trivial solution and a stable limit cycle solution coexist in addition to an unstable limit cycle solution. Again domains of attraction of the two stable solutions are calculated and their dependence on the vehicle speed is shown. The probabilities of occurrence of the two stable solutions are calculated, where special interest is given to the probability of occurrence of the undesired limit cycle solution.     

提速货车装用不平衡轮对后对交叉杆疲劳强度影响的分析

根据对提速货车转向架在实际运用线路中装用平衡轮对和装用不平衡轮对在空车与重车的不同工况下应力测试数据,应用疲劳强度理论对转向架关键部件的疲劳强度进行计算,分析了提速货车装用不平衡轮对后对交叉杆疲劳强度的影响。     

连续测力轮对的数字试验研究

利用现车辐板轮制作连续测力轮对是当今轮轨力测量的一个趋势。然而，在试验室完成测力轮对的贴片与标定是一件十分费事的工作，而且最佳的贴片位置也不容易找到。现提出以有限元为基础的计算机仿真方法，分别对在垂向、横向载荷作用下的车轮辐板上的应变分布进行计算，并和试验结果进行比较，计算机仿真结果和试验结果吻合较好，进而分析计算不同的垂向及横向加载点对车轮辐板观测点应变的影响，寻找最佳贴片位置。这种计算方法可以大大缩短测试轮对的设计及标定周期，寻找最佳贴片位置，提高轮轨力的测试精度。     

Re-adhesion control for a railway single wheelset test rig based on the behaviour of the traction motor

A method for detecting wheel slip/slide and re-adhesion control of AC traction motors in railway applications is presented in this paper. This enables a better utilisation of available adhesion and could also reduce wheel wear by reducing high creep values. With this method, the wheel–rail (roller) creepage, creep force and friction coefficient can be indirectly detected and estimated by measuring the voltage, current and speed of the AC traction motor and using an extended Kalman filter. The re-adhesion controller is designed to regulate the motor torque command according to the maximum available adhesion based on the estimated results. Simulations under different friction coefficients are carried out to test the proposed method.     

轮对定位刚度对机车运用性能影响的分析

阐述了轮对纵向，横向定位刚度（ｋｘ及ｋｙ）对机车直线运行及曲线通过性能的影响，指出了客运，货运机车对ｋｘ及ｋｙ的不同要求，建议对不同运用条件下机车分别研究合理的轮对纵向，横向的定位刚度，并对正确计算轮对的横向定位刚度提出了看法，最后，举例介绍国外高速机车轮对定位装置的结构及相应的参数。     

FLNG集成控制及安全系统设计浅谈

作为 FLNG的大脑和指挥中心,集成控制及安全系统对整个FLNG的生产运营及安全保障起到了至关重要的作用。本文将结合已成功交付的国内首座FLNG项目为案例,对该项目的集成控制及安全系统的配置特点、主要功能等方面进行了介绍,并结合笔者在设计过程中的一些心得体会归纳总结出一套适用于FLNG集成控制及安全系统的设计方法。