This paper describe a discrete time off-line identification method performed by using input and output data having a constant steady state output response such as a step response. A step input causes noise or vibration from a mechanical system only at the moment when it is applied but they are attenuated asymptotically. The method can directly acquire any order of reduced model without knowing the real order of the plant. The effectiveness of the method is verified by applying it to a two-mass mechanical system.
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