By deducing the theory of this method , it comes to a conclusion that auto - cross spectrum density method is much the same as peak picking method based on frequency response function . and it also talks about the virtues and defects of the method 本文通过对相关理论的推导,说明了自互谱法与基于频响函数的峰值摄取法是近似相通的,同时对该方法的优缺点作了叙述。
( 1 ) equation is deduced when input is complete correlation , frequency response function has not solution ( order of numerator of polynomial need not be defined ) . we can directly use superposition principle of linear system to obtain response without solving frequency response function ( 1 )当输入部分相关时,输入矩阵为非对角矩阵,其频响函数不能直接求得,本文推导了解决此类问题的公式。
The dynamic behavior of a long span cable - stayed bridge ( north bridge of runyang yangtse river bridge ) is calculated , the frequency response function ( frf ) is compressed using principal component analysis ( pca ) , and the frf is then reconstructed based on a few , principal components 摘要针对润扬长江大桥北汉斜拉桥进行动力分析，采用主元分析对其频响函数进行了有效降维，并根据降维后的主元重构了结构频响。
The field tests of the no . 15 stay cable attached with oil - dampers in the qiantang jiang no . 3 bridge are conducted . the tests data are analyzed by the fitting method of the frequency response function . the dynamic characteristics of the cable and dampers are investigated 对已安装了阻尼器的钱塘江三桥15号斜拉索进行了现场振动测试，采用频响函数拟合法对试验数据进行了分析，得出了已有阻尼器及拉索的动力特性。
It can meet t he tribology test ' s real - time require because of good frequency characterization . in the test system , it is successful to use the virtual instrument technique in tribology experiment , which pioneered a novel method of measuring and testing technique of tribology 由于其具有良好的频响特性，满足了试验的实时测试要求，并成功的将虚拟仪器技术与摩擦学试验结合起来，为摩擦学测试技术开辟了新的发展方向。
