The damping performance of the Non-Obstructive Particle Damping (NOPD) in cylindrical shell was investigated. Tungsten carbide particle was embedded within longitudinal holes drilled in the structure. The effects of various system parameters—including particle size, mass ratio and frequency of excitation—were investigated. It is shown that NOPD, even with a small mass ratio, can be very effective in attenuating the vibration of cylindrical sleeve, and this effect is weaken when the mass ratio get to 2%. It is further shown that the effect of the NOPD is distinct in suppressing the response of the cylindrical sleeve at different frequency. The suppressing effect is substantially dependent on the particle size and the frequency band. On the lower resonance frequency, the larger particle has a further effect.
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