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Nonstationary coherence characteristics of dual track road profile data

机译：双轨道路剖面数据的非平稳相干特征

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The ability to accurately simulate the vibratory motion of transport vehicles is of great importance when designing vehicle components and product containment systems. Direct measurement and analysis of the vibrations is not always practical and laboratory testing using synthesized road elevation data is a common alternative, as is numerical simulation. However, no technique exists to generate realistic nonstationary dual track road elevation data. This research focuses on uncovering statistical distributions that describe the nonstationary relationships between the left and right wheel-paths. Analysis of the short-time (nonstationary) coherence functions and instantaneous International Roughness Index (IR1) of measured road profile data provided distributions which describe variations in left to right wheel-path correlation and roughness variations for both tracks. The resulting distributions can be described with a three-parameter Weibull distribution and can be adopted to generate nonstationary dual wheel-path profile data that can be used to excite numerical vehicle models and physical vehicles via multi-axis simulators.
机译：在设计车辆部件和产品容纳系统时，准确模拟运输车辆振动的能力非常重要。直接测量和分析振动并不总是可行的，使用合成的道路高程数据进行实验室测试是常见的选择，数值模拟也是如此。但是，不存在生成现实的非平稳双轨道路高程数据的技术。这项研究的重点是发现描述左轮轨迹和右轮轨迹之间的非平稳关系的统计分布。对测量的道路轮廓数据的短时（非平稳）相干函数和瞬时国际粗糙度指数（IR1）的分析提供了分布，该分布描述了左右两条轨迹的车轮路径相关性变化和粗糙度变化。所得的分布可以用三参数威布尔分布来描述，并且可以用来生成非平稳的双轮轨迹轮廓数据，该数据可用于通过多轴模拟器激发数字车辆模型和物理车辆。

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