Research on Estimation of Frequency Response Function  

频率响应函数估计研究

作　　者：郑慕侨[1] 李立[1] 胡社平 

机构地区：[1]北京理工大学车辆工程学院,北京100081

出　　处：《Journal of Beijing Institute of Technology》1993年第1期27-37,共11页北京理工大学学报（英文版）

摘　　要：Based on an investigation of existing methods for estimating fre- quency response functions(FRF)at home and abroad,two methods are ad- vanced.The one,denoted as H_(12),avoids underestimates at resonances and overestimates at antiresonances,while the other,denoted as H_F,regards the noise ratio of output to input as varying with the frequency.Finally,a soft- ware for estimating frequency response functions is introduced.A modal test for a steel plate excited with a random signal is made,and frequency response function estimates are made,making use of the above software.The test re- sults conform well with the theoretical analysis.论文在分析研究国际上各种频响函数估计方法的基础上,提出了两种改进的估计方法.一种称 H_(12)估计.它避免了在共振区的过低估计和反共振区的过高估计.另一种称 H_F 估计,它与随频率而变化的输入端、输出端信噪比有关,更接近实际情况.编制了完整的计算机估计计算程序,并在一块钢板上进行了频响函数试验,测试估计的结果比现有方法更接近理论分析.

关 键 词：frequency response ESTIMATION DAMPING resonance/antiresonance 

分 类 号：TB122[理学—工程力学] TB123[理学—力学]