The measurement of loads acting on a railway line has become fundamental since the liberalisation of the access to the railway infrastructure (EC directive 440/91); in the years many design of track installation capable of measuring the vertical forces between wheel and rail have been developed. Dipartimento di Meccanica e Tecnologie Industriali of the University of Florence recently improved its reliable measurement system which is able to measuring the lateral (Y) force as well as the the vertical (Q) force at the wheel-rail contact while preserving mounting easiness. The system is based on the measure strains on the neutral axis of the rail by means of a set of strain gauges installed in a plug that is press fitted in a hole drilled in the rail web. As long as the reliable estimation of the average wheel-rail load requires the measurement and processing of the signals collected from a number of sensors, this paper investigates the influence of local track stiffness deviations on the quality of the estimation. A combined multibody-finite element approach is used to both overcome the limitations and get the advantages of the capabilities of the two methodologies.
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机译：自由于铁路基础设施的自由化（EC指令440/91）以来，作用在铁路线上的负荷的测量变得基本;在多年来，已经开发出能够测量车轮和轨道之间的垂直力的轨道安装设计。佛罗伦萨大学的Dipartimento di Meccanica e Tecnologie工业最近改进了其可靠的测量系统，该系统能够测量横向（Y）力以及轮轨接触处的垂直（Q）力，同时保持安装容易。该系统基于轨道的中性轴线上的测量菌株，借助于安装在塞子中的塞子中的塞子中的一组应变仪表，该测量仪表在轨道网中钻孔中的孔中。只要平均轮轨负荷的可靠估计需要从多个传感器收集的信号的测量和处理，本文研究了局部轨道刚度偏差对估计质量的影响。组合的多体 - 有限元方法用于克服限制并获得两种方法的能力的优点。
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