Mechanical joint often has a significant effect on the dynamical behavior of high-speed horizontal machining center.Identifying the dynamic parameters of the joints correctly is a prerequisite to establish its precise dynamic model.The method based on frequency response function (FRF) to identify the characteristic parameters of bolted joints and make some researches on the equivalent way was proposed by combining theoretical derivation with experimental research,which defined identification formula and sensitivity,and the experimental data was selected by sensitivity which could extract the favorable data and suppress the unfavorable data. On this basis,the inconsistent equation containing identification formula was established,and the equivalent dynamic parameters were obtained through solving the inconsistent equation by means of the least square sense.In the end,this method was applied to one experiment based on LMS system,and the result showed that it significantly improved the identification and equivalence precision.
