Accuracy of the half-power bandwidth method with a third-order correction for estimating damping in multi-DOF systems

(整期优先)网络出版时间:2013-01-11
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Athird-ordercorrectionwasrecentlysuggestedtoimprovetheaccuracyofthehalf-powerbandwidthmethodinestimatingthedampingofsingleDOFsystems.Thispaperanalyzestheaccuracyofthehalf-powerbandwidthmethodwiththethird-ordercorrectionindampingestimationformulti-DOFlinearsystems.Dampingratiosinatwo-DOFlinearsystemareestimatedusingitsdisplacementandaccelerationfrequencyresponsecurves,respectively.Awiderangeofimportantparametersthatcharacterizetheshapeoftheseresponsecurvesaretakenintoaccount.Resultsshowthatthethird-ordercorrectionmaygreatlyimprovetheaccuracyofthehalf-powerbandwidthmethodinestimatingdampinginatwo-DOFsystem.Inspiteofthis,thehalf-powerbandwidthmethodmaysignificantlyoverestimatethedampingratiosoftwo-DOFsystemsinsomecases.