Friction modifier application to railroad tracks

摩擦改进剂在铁轨上的应用

• 批准号: 508934-2017
• 负责人: Green, Sheldon
• 金额: $ 4.77万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=652415
• 关键词: Friction; modifier; application; railroad; tracks

Railroads apply various friction modifiers to railroad tracks. Some friction modifiers reduce the friction between the wheel and rail to a low-intermediate value, which improves fuel economy and reduces wheel wear and wheel squeal. These friction modifiers are normally applied as liquids. Other friction modifiers enhance the friction between the train wheel and the rail, to improve breaking and traction in slippery conditions. In these applications the friction modifier is usually a granular solid such as sand. The research proposed here will look at the application of liquid and solid friction modifiers to railroad tracks. ****One way to apply liquid friction modifier to tracks is to ooze the liquid onto the tracks from a stationary supply, and then have the train wheels pick up liquid from the puddle of friction modifier. The research will study how wheels pick up liquid from a puddle, and how that liquid is subsequently carried far downstream on the tracks (so called "carry down"). The researchers will also study how the liquid properties affect liquid "carry down", with the goal of recommending alternative liquid formulations to improve "carry down". ****Granular solids are normally conveyed to the tracks from train-mounted sanders that blow sand onto the tracks upstream of train wheels. Any sand dispensed by the sander that does not make it to the wheel-rail nip is wasted. The researchers will study rail sanding in a laboratory setting by creating a sander, wheel, and rail system that simulate a full-scale sander. The trajectory of sand particles issuing from the sander, and the fraction of the sand that lands into the nip between the wheel and rail, will be measured. A novel (non-sand) granular material will also be studied, to understand how its different bounce characteristics will affect the fraction of material entering the wheel-rail nip. Based on these measurements the operation of the sander and the characteristics of the sand particles will be optimized, minimizing the amount of product that is wasted.****

铁路将各种摩擦改进剂应用到铁轨上。一些摩擦改进剂将车轮和钢轨之间的摩擦力降低到中低值，从而提高了燃油经济性，减少了车轮磨损和车轮噪音。这些摩擦改进剂通常作为液体使用。其他摩擦改进剂可增强列车车轮和钢轨之间的摩擦力，以改善在湿滑条件下的制动和牵引力。在这些应用中，摩擦改进剂通常是颗粒状固体，如沙子。这里提出的研究将着眼于液体和固体摩擦改进剂在铁路轨道上的应用。*将液体摩擦改进剂应用到轨道上的一种方法是从固定的供应源将液体渗入轨道，然后让火车车轮从摩擦改进剂的水坑中吸取液体。这项研究将研究车轮如何从水坑中吸收液体，以及随后这些液体如何被轨道带到下游(即所谓的“顺流而下”)。研究人员还将研究液体的性质如何影响液体的“携带”，目标是推荐替代液体配方来改善“携带”。*颗粒状固体通常从火车上安装的沙子输送到轨道上，沙子会将沙子吹到火车车轮上游的铁轨上。砂光机分配的任何沙子如果不能到达轮轨夹缝，都会被浪费。研究人员将在实验室环境中通过创建一个砂光机、车轮和轨道系统来模拟全尺寸砂光机来研究钢轨砂光。将测量从砂轮机中喷出的沙粒的轨迹，以及落入轮轨之间的夹缝中的沙粒的比例。还将研究一种新型(非砂子)颗粒材料，以了解其不同的反弹特性将如何影响进入轮轨夹的材料的比例。在这些测量的基础上，砂光机的运行和砂粒的特性将被优化，将浪费的产品数量降至最低。