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首页> 外文会议>International Conference on Recent Advances in Space Technologies >Estimation of In-Flight Vibration Loads for Overall Structure Using Modal Survey and Operational Data from Limited Locations
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Estimation of In-Flight Vibration Loads for Overall Structure Using Modal Survey and Operational Data from Limited Locations

机译：使用模态测量和有限地点的运行数据估算整个结构的飞行中振动载荷

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摘要

In the design development phase of engineering structures, operational vibration measurements from many locations are very important. However, for most cases it is impractical and even impossible to instrument a structure with sensors at many locations. An alternative method is to estimate the vibration environment of the structure by utilizing frequency response function set of the structure from all points of interest and measurement from limited locations. To obtain the frequency response function set for the estimation purposes, a careful modal survey study of the structure in the operational conditions should be conducted carefully. After this step, using proper functions from the modal survey and the power spectral density of the operational data, the input force power spectral density curve is constructed. Then the vibration environment of any location of the structure can be estimated using the constructed input force data and the relevant frequency response function. In order to check the effectiveness of the methodology, a simulated experiment is designed to replicate in flight vibration loads. In the experiment, from one of the measured power spectral density data another one is estimated using the proposed methodology. The estimated acceleration data curve is compared with the measured one from the estimation location and a good agreement is achieved between the estimation and the measurement.
机译：在工程结构的设计开发阶段，从多个位置进行操作振动测量非常重要。但是，在大多数情况下，在许多位置使用传感器来测量结构是不切实际的，甚至是不可能的。一种替代方法是通过从所有关注点利用结构的频率响应函数集并从有限的位置进行测量来估计结构的振动环境。为了获得用于估算目的的频率响应函数集，应仔细进行结构在运行条件下的模态调查研究。在此步骤之后，使用模态调查中的适当功能和操作数据的功率谱密度，可以构建输入力功率谱密度曲线。然后，可以使用构造的输入力数据和相关的频率响应函数来估计结构任何位置的振动环境。为了检查该方法的有效性，设计了一个模拟实验来模拟飞行中的振动载荷。在实验中，使用所提出的方法从一个测得的功率谱密度数据中估计出另一个。将估计的加速度数据曲线与从估计位置测得的加速度数据曲线进行比较，并在估计和测量之间达成良好的一致性。

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