AmatrixperturbatiotheoryistructuraldynamicdesigispresentedithisbookThetheorycoversabroadspectrumofsubjects,theperturbaiomethodsofthedistincteigenvaluesandrepeated/closeeigenvalues,theperturbatiomethodsoftheplexmodesofsystemswithrealunsymmetricmatrices,theperturbatiomethodsofthedefective/neardefectivesystems,randomeigenproblemandtheintervaleigenproblemfortheuncertaistructures.Thecontentssynthesizedthemostrecentresearchresultsithestructuraldynamics.Numericalexamplesareprovidedtoillustratetheapplicationsofthetheoryithisbook.Thisbookisremendedtograduates,engineersandscientistofmechanical,civil,aerospace,oceaandvehicleengineering.