The fluidization characteristics of binary Geldart D type particles in a vibrated gas-fluidized bed (VGFB) were studied deploying the collaborative measurement by impact force sensor and high-speed image analysis system. The synergistic effects of the operational parameters including vibration amplitude, vibration frequency and fluidizing air velocity on the fluidization characteristics of a VGFB were studied. The changing laws of bed pressure drop and particulate impact force were analyzed and confirmed macroscopically by the high-speed dynamic images. The results showed that the fluctuation range of the signals of pressure drop and particulate impact force decreases with the increase of fluidizing air velocity and bed height due to the energy dissipation of vibration and the increase of bed expansion ratio. Furthermore, the effects of bubbling behavior on the pressure drop and particulate impact force were revealed by the combination of the frequency domain analysis of signals and the high-speed dynamic image analysis. (C) 2019 Elsevier B.V. All rights reserved.