One-time operational modal analysis (OMA) of large civil structures requires measurements of the vibrations, which, according to the number of channels to be measured, are generally expensive and arduous to obtain. In this study, identification of modal parameters of civil structures has been investigated by using multiple setups with a roving reference channel. In this manner, a limited amount of equipment becomes sufficient for OMA of structures. The procedure consists of a transformation function between measurement setups, which transforms all measured data to the time frame of a selected reference setup. To illustrate the procedure, an existing 10 story laboratory shear frame model is considered. A numerical and an experimental investigation have been carried out to identify its modal characteristics. The validity of the procedure has been explained in detail by making use of a coherence function in-between the multi-setup measurements. According to the results, OMA by using only a few sensors with the performed procedure can be equivalent to OMA by using a full measurement setup. Against a common believe, the results of this study reveal that synchronization among the setups does not prominently affect the identification results.

中文翻译：

---

使用流动参考进行多次设置测量的预识别数据合并

大型土木结构的一次性运行模态分析 (OMA) 需要对振动进行测量，根据要测量的通道数量，这通常是昂贵且难以获得的。在这项研究中，土木结构的模态参数的识别已经通过使用带有流动参考通道的多个设置进行了研究。通过这种方式，有限数量的设备对于结构的 OMA 就足够了。该程序包括测量设​​置之间的转换功能，它将所有测量数据转换为所选参考设置的时间范围。为了说明该过程，考虑了现有的 10 层实验室剪切框架模型。已经进行了数值和实验研究来确定其模态特性。已经通过使用多设置测量之间的相干函数详细解释了该过程的有效性。根据结果​​，仅使用少数传感器执行程序的 OMA 可以等效于使用完整测量设置的 OMA。与普遍看法相反，这项研究的结果表明，设置之间的同步不会显着影响识别结果。