结构热模态试验数据处理的工程方法

针对热模态试验中结构的模态参数随时间发生变化,常温模态试验的参数识别方法不再适用于热模态试验数据的处理的问题,对时变结构模态参数识别方法进行研究,提供了一种工程化的方法。在成熟的时变结构模态参数识别方法及工程化软件研制成功之前,利用＂时间凝固法＂得到系统在每一时刻的伪模态参数,并进一步分析得到伪模态参数随时间和温度的变化规律与范围,可以作为时变结构模态参数的工程近似解。

An Engineering Method of Data Processing for Structural Modal Test with Thermal Environment

With regard to the structural modal test with thermal environment,classical methods of modal parameter identification for modal test cannot be applied to its data processing,because of the modal parameter is varying along with the time in the process. Mature methods and softwares of time-varying modal parameter identification are wanted,yet not achieved. An engineering method is given to obtain the approximate solution of time-varying modal parameter. Pseudo-modal parameter of all time stages is obtained on time-fixed assumption,then its rule and range to vary along with the time and temperature.