Vibration of gas-solid fluidized beds is often used to enable fluidization of cohesive particles; however, it has also been shown to reduce the minimumfluidization velocity (U-mf). Here, we show via experiments that vibration can reduce both U-mf and the minimum bubbling velocity (U-mb) in Geldart Group B and D particles. We observe that U-mf is reduced more than U-mb, thereby creating a densely packed, bubble-free fluidization state when the superficial gas velocity is in between U-mf and U-mb. U-mf and U-mb decrease with increasing vibration frequency and amplitude and the results for U-mf and U-mb across a variety of vibration conditions could be plotted along a single curve when plotted versus vibration strength, i.e. the ratio of peak vibration acceleration to gravitational acceleration. Changes in U-mf and U-mb due to vibration are not affected significantly by changing particle density, but in a non-monotonic way by changing particle diameter. (C) 2021 The Author(s). Published by Elsevier B.V.