Steady-state detection is to determine whether the chemical process is operating in a state of steadiness or not.It is an essential step in the field of process optimization and so on.Based on wavelet packet analysis for denoising

a steady state detection scheme is constructed in this study.The scheme includes three steps

removing coarse error

denoising and identifying steady state periods

and is featured with simple implementation and good accuracy.In the denoising step with wavelet packet transform

a compensating factor is introduced for the threshold

making it flexible and easy to achieve the right balance between removal of the noise and preservation of the true value of a signal.Two simulation tests are presented to demonstrate the effectiveness of the scheme of this study.