一种非接触式受电弓弓头碳滑块厚度检测方法

ZL201811024228.9一种非接触式受电弓弓头碳滑块厚度检测方法-许向红、张颢

一种非接触式测量受电弓模态的方法

本发明公开了一种非接触式测量受电弓模态的方法，用于受电弓模态测量，包括：两个相机、固定架、光源、无线传输模块和上位机，相机和光源安装在固定架上，光源用于照射受电弓的被测区域，相机拍摄受电弓被测区域的图像通过无线传输模块传输到上位机中进行处理，上位机分析处理图像得到受电弓的模态；其中受电弓安装在机车顶部，固定架通过真空吸盘固定在机车顶部，与受电弓处于同一安装平面内；光源为蓝光光源，两个相机为镜头前安装有使得蓝光光源成为成像光源的带通滤镜；上位机中安装有DIC操作软件

一种非接触式受电弓升降弓臂杆位置关系测量方法

ZL201811013065.4一种非接触式受电弓升降弓臂杆位置关系测量方法-许向红、叶梓佑、张颢

Effect of coupled vibration modes of dual-strip pan head on pantograph-catenary interaction

The consistency of the dynamic behavior of the mechanical equivalent model of high-speed pantographs with that of actual high-speed pantographs under service conditions is crucial for the correctness and accuracy of the numerical simulation results of the pantograph-catenary interaction. Firstly, based on experimental data and the finite element method, models of a mass-point frame and reduced pan head were established, which can simulate the rolling and pitching motion characteristics of the dual-strip pan head. The correctness of the finite element numerical simulation of the pantograph-catenary system based on the model was verified through an industry standard and line tests. Then, the variation law of the standard deviation of the contact force (SDCF) in the speed range of 240-450 km/h was studied, and the mechanism of large fluctuation in SDCF was explained from the perspective of pantograph-catenary resonance. Finally, the influence of pan head degree of freedom and low-pass filtering frequency of the contact force time-domain signal on SDCF was studied, and the applicable speed level of the traditional three-mass model and 20 Hz filtering were provided

Pantograph-Catenary Interaction Prediction Model Based on SCSA-RBF Network

As a traditional numerical simulation method for pantograph-catenary interaction research, the pantograph-catenary finite element model cannot be applied to the real-time monitoring of pantograph-catenary contact force, and the computational cost required for the multi-parameter joint optimization of the pantograph-catenary system with the finite element model is very high. In this paper, based on the selective crow search algorithm-radial basis function (SCSA-RBF) network, the time-domain signal of the panhead acceleration, which can be obtained in real-time through non-contact test technology, is taken as the boundary condition to directly solve the pantograph dynamic equation and a data-physics coupling model that can quickly predict the pantograph-catenary interaction is proposed. The prediction model is trained and verified using the dataset generated through the finite element model. Furthermore, the prediction model is applied to the multi-parameter joint optimization of six pantograph dynamic parameters and nine pantograph dynamic parameters, considering nonlinear panhead stiffness, and optimization suggestions under various speeds and filtering frequencies are given

基于模态实验的单滑板受电弓全柔模型修正方法

动车组通过受电弓从接触网上获取电能,良好的弓网接触是列车受流的重要保障.随着列车速度的提高,弓网动态特性问题日益突出.受电弓在高速或更高速运行时,接触网不平顺、气动效应等高频激励,将激发受电弓的高频弹性模态及富有高频成分的弓网相互作用力.只考虑受电弓3个垂向自由度的三质量块模型不再适用于高频弓网动力学分析,为进行更高速下的受电弓动力学参数设计和弓网受流质量评估,需建立反映结构弹性模态的受电弓全柔模型.文章提出基于模态实验的受电弓全柔模型的修正方法.首先,开展一款新型单滑板高速受电弓的模态实验,获得260 Hz以内的两阶垂向耦合振动模态参数和6阶垂向弹性模态参数.然后,进行受电弓模态频率对材料参数的灵敏度分析,研究得到弓头、上臂和下臂的弹性模量和密度及弓头弹簧刚度,对受电弓的8阶垂向模态频率的影响显著,确定了模型修正的参数.最后,利用粒子群优化算法,获得与模态实验结果吻合度较高的修正全柔模型,其与实验结果的误差仅为5.2%.此外,提出基于模态置信度的振型识别方法,实现了迭代寻优过程中正确率为100%的模态自动识别

高速受电弓下框架等效阻尼的实验研究

良好的弓网关系要求满足弓网接触力平均值的前提下,其标准差尽可能小。已有研究结果表明下框架等效阻尼增大可以有效降低接触力标准差。以DSA380型高速受电弓为研究对象,本文设计了悬挂弹簧法,结合文献中提出的下置弹簧法,实现了将各部件对下框架阻尼贡献的解耦测量分析,提出了采用双阻尼器这一可行的优化设计方案

弓网接触力在线测试方法研究

弓网接触力是评估弓网受流质量和弓头滑板磨损寿命、诊断接触网局部缺陷的直接依据,其在线监测是未来电气化铁路发展亟待解决的关键问题之一。针对现有测试方法存在的问题,本文提出了在弓头簧片背面安装应变传感器的可行方案,避免了滑板更换对传感器带来的影响;同时,实现了加载过程中任一时刻接触点位置的直接测量,结合测点应变值,可直接反推出接触力,无需对滑板实体结构进行简化