This paper gives a method for converting finite-length transient response signals with non-zero steady-state values into the frequency domain. In the method, the signal is discrete Fourier transformed after adding a linear function without DC component. The linear function is equivalent to the AC components of a step function whose amplitude is the steady-state value of the signal in the frequency domain. The usefulness of the proposed method is confirmed by a numerical experiment and an experiment to estimate the frequency characteristics of the transient response signals obtained from an actual position control system for a mass-spring-damper system.
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