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A spectral pedestrian-based approach for modal identification

机译：基于频谱行人的模态识别方法

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The dynamic behaviour of footbridges is characterised by modal properties such as natural frequencies, mode shapes, damping ratios and modal masses. Their estimation via modal tests often requires expensive or difficult-to-operate equipment (e.g. shaker and instrumented impact hammer) or, sometimes unavailable high signal-to-noise ratios in tests relying on natural (e.g. wind, airborne noise and ground-borne vibration) excitation. In addition, the modal properties determined in modal tests do not necessarily apply to the structure under pedestrian traffic in case of amplitude-dependent frequencies and damping ratios. The current work proposes a novel approach that stands in contrast to the widely used tests, based on modal identification using an excitation induced by a single pedestrian. In order to account for estimation and observation uncertainties, the relationship between the power spectrum of the response and its modal properties is described with a likelihood function. It is shown that it is possible to reliably estimate modal properties using pedestrian walk forces measured in the laboratory, and dynamic responses measured when the same pedestrian is crossing a footbridge at timed pacing rates. The approach is validated using numerical and field data for a 16.9 m long fibre reinforced polymer footbridge. This work paves a new way for simple and low cost modal testing in structural dynamics. (C) 2019 The Authors. Published by Elsevier Ltd.
机译：脚架的动态行为的特征在于诸如自然频率，模式形状，阻尼比和模态肿块等模态特性。通过模态测试的估计通常需要昂贵或难以操作的设备（例如振动器和仪器和仪表撞击锤），或者有时在依赖于天然的测试中的测试中有时不可用的高信噪比（例如风，空气噪声和地面振动刺激。另外，在幅度依赖性频率和阻尼比的情况下，模态测试中确定的模态性能不一定适用于行人流量下的结构。目前的工作提出了一种新的方法，其与广泛使用的测试形成对比，基于使用单行行人引起的激励的模态识别。为了考虑估计和观察不确定性，描述了响应的功率谱与其模态特性之间的关系进行了似然函数。结果表明，可以使用在实验室中测量的行人行走力来可靠地估计模态特性，并且当同一行人以定时起搏速率交叉行人桥时测量的动态响应。使用用于16.9M长纤维增强聚合物人行桥的数值和现场数据进行验证该方法。这项工作为结构动态的简单和低成本模态测试铺平了一种新的方式。 （c）2019年作者。 elsevier有限公司出版

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