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第三届全国压电和声波理论及器件技术研讨会

作者： Zong-jian YAO School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China Gui-lan YU,Yue-sheng Wang,Zhi-fei Shi School of Civil Engineering,Beijing Jiaotong University,Beijing,100044,China

The band structures of bending waves propagating in the phononic crystal thin plates with point defect are explored based on the supercell technique combined with the improved plane wave expansion *** plate is composed of a periodic array of circular crystalline Al2O3 cylinders embedded in the epoxy matrix for square *** point defect is introduced by changing one of the cylinders’ *** results show that the defect modes exist in the frst band gap,the frequencies and the numbers of the defect modes are strongly dependent on the defect filling fraction and the filling *** the flat defect bands appearing in the first band gap are *** a given defect filling fraction,there are up to five nondegenerate defect bands emerging inside the first band *** the fiequencies of defect bands increase with the filling fraction *** defect bands disappear at very low or very high filling *** a given filling fraction,three nondegenerate defect bands appearing near the upper edge of the gap move to the middle as the defect filling fraction is reduced,and the edges of the first band gap remain hardly *** study of the displacement distributions associated with the three defect modes shows that the flat bands correspond to the special localized frequencies of the *** the two lower defect modes,the displacement amplitudes around the defect are much bigger than that at or far away from the ***,for the higher defect mode,the displacement amplitude reaches the maximum at the location of the defect and decays rapidly with the distance away from ***,the bending waves correspond to such three modes are so localized at or near the defect that they can not escape into the surrounding phononic *** is,the point defect behaves like a resonant vacant.

关键词： Phononic crystals thin plates point defect bending waves

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Resuspension of spherical particles due to surface vibration

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Particuology 2021年第1期19卷 126-135页

作者： Sofia Eirini Chatoutsidou Mihalis Lazaridis School of Environmental Engineering Technical University of Crete73100 ChaniaGreece

In this study,particle resuspension due to surface vibration was investigated.A spherical particle was assumed to rest on top of a thin plate,and an external vibrating force was applied normal on the plate at t=0 and at distance R from the *** external driving force created a displacement field in both time and space domains,where deformations in the body of the plate were considered small elastic oscillations that are perpendicular to the propagation of the *** oscillations were introduced via the theory of elasticity and the creation of waves on thin plates,i.e.,bending *** motion in the vertical direction was initiated through plate displacement,provided that inertia due to particle mass is *** particular,the particle was assumed to oscillate with a force(of oscillation)estimated via Newton’s second law of motion,comprising of two components:the acceleration due to the plate displacement and the particle ***,a simple force balance method was used to determine the conditions for ***,resuspension occurs when the oscillation force exceeds the couple of the adhesive and gravitational *** results suggest that the plate displacement depends on the characteristics of the applied force,material properties,and plate *** addition,it was found that the oscillation force is substantially lower than the applied force and that it depends on plate displacement and particle ***,the particle size significantly influencedthe outcome of ***,resuspension is favorable for large particles,strong applied forces,and high forcing frequencies.

关键词： Particle resuspension Vibration bending waves

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