This research aims to investigate the feasibility of using ambient vibration testing for system identification of an elevated water tank. To identify the natural dynamic properties, the experimental study is carried out on an elevated steel water tank located in Tehran. The tank is instrumented with a sensitive velocimeter sensor (microtremor), and the ambient velocity of the tank is recorded for 30[Formula: see text]min in three orthogonal axes. Employing the peak-picking method in the frequency domain, the fundamental frequency of the tank is determined as about 1.9[Formula: see text]Hz. Then, the numerical model of the tank is generated and calibrated based on the obtained data. In the primary modeling, the values of natural frequencies of the tank are in good agreement with the results of the ambient vibration data. This finding is judged to be reasonable considering no clear sign of corrosion in the steel material.

中文翻译：

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基于环境振动试验的高架钢水箱结构系统辨识与数值模型标定

本研究旨在探讨使用环境振动测试对高架水箱进行系统识别的可行性。为了确定自然动态特性，在位于德黑兰的高架钢水箱上进行了实验研究。罐装有灵敏的测速传感器（微震），罐的环境速度在三个正交轴上记录 30[公式：见正文]分钟。采用频域拾峰法，确定槽的基频约为1.9[公式：见正文]Hz。然后，根据获得的数据生成并校准储罐的数值模型。在初步建模中，储罐的固有频率值与环境振动数据的结果非常吻合。