According to the method of short time power spectrum estimation which had the function of inertia filtering,the statistic average value of paper-making speed fluctuation signal period or frequency was obtained at arbitrary moment in case of giving up partial dynamic characteristics,and the method ability of anti-disturbance was verified with strong Gauss white noise and color noise.

The interrupt function of single chip 80C196KB high speed input component and its application to vehicle speed signal acquisition system is introduced in this paper.

Determination the number of freedom degree of voidage fluctuation signals in gas-solid fluidized bed is the premise and basis for quantificationally describing the gas-solid fluidized system.

Generally,the friction differential pressure fluctuation signal or throttle differential pressure fluctuation signal was used to analyze the property of Gas-liquid two-phase flow.