Statistical Properties of Train Vibration Spectra for Ground-Borne Noise Assessments

IF 1.7 4区 物理与天体物理 Acoustics Australia Pub Date : 2024-08-23 DOI:10.1007/s40857-024-00334-y
Dominik Duschlbauer, Michael Allan, James Nelson
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Abstract

The train vibration levels at a receiver are primarily governed by the trackform and its offset from the tracks. For a given trackform and offset, however, there can still be a wide variation in vibration generated by trains depending on the wheel and rail surface conditions, composition of the fleet and train speeds. In Australia, policies for the assessment of ground-borne noise and vibration are generally focused on the 95th percentile of train pass-bys. The use of this statistical descriptor is equivalent to a 5% exceedance level, i.e. vibration from one in twenty trains can be expected to be greater. This paper analyses four vibration datasets measured in Australasia. Three sets were measured on busy metropolitan train networks with direct fixation tracks in tunnels, and one dataset was measured on a ballasted surface track. The study focuses on the calculation of 95th percentiles and the effect of dataset size on the resulting 95th percentile vibration levels. Statistical error bands are calculated as a function of the number of consecutive pass-bys used in the dataset which allows for estimating the potential risks associated with working with small datasets. The effect of different approaches for calculating the percentiles is also discussed.

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用于地面噪声评估的列车振动频谱统计特性
接收器处的列车振动水平主要受轨道形式及其与轨道的偏移量的影响。然而,对于给定的轨道形式和偏移量,列车产生的振动仍会有很大差异,这取决于车轮和轨道表面条件、车队组成和列车速度。在澳大利亚,地面噪声和振动的评估政策通常侧重于列车通过的第 95 百分位数。使用这一统计描述指标相当于 5%的超标水平,即每 20 辆列车中就有一辆列车的振动可能会更大。本文分析了在大洋洲测量的四个振动数据集。其中三组数据是在繁忙的大都市列车网络上测量的,这些列车网络在隧道中直接固定轨道,一组数据是在有砟地面轨道上测量的。研究的重点是第 95 百分位数的计算以及数据集大小对由此得出的第 95 百分位数振动水平的影响。统计误差带是作为数据集中使用的连续通过次数的函数来计算的,这样可以估算与小数据集相关的潜在风险。此外,还讨论了计算百分位数的不同方法的影响。
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来源期刊
Acoustics Australia
Acoustics Australia ACOUSTICS-
自引率
5.90%
发文量
24
期刊介绍: Acoustics Australia, the journal of the Australian Acoustical Society, has been publishing high quality research and technical papers in all areas of acoustics since commencement in 1972. The target audience for the journal includes both researchers and practitioners. It aims to publish papers and technical notes that are relevant to current acoustics and of interest to members of the Society. These include but are not limited to: Architectural and Building Acoustics, Environmental Noise, Underwater Acoustics, Engineering Noise and Vibration Control, Occupational Noise Management, Hearing, Musical Acoustics.
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