In this article,the interlayer shear effects on vibrational behavior of bilayer graphene(BG)are studied by using the molecular mechanics(MM)simulation.Investigation on mechanical behavior of graphenes has recently att...In this article,the interlayer shear effects on vibrational behavior of bilayer graphene(BG)are studied by using the molecular mechanics(MM)simulation.Investigation on mechanical behavior of graphenes has recently attracted because of their excellent properties.MM simulation is exploited for modeling of covalent bond in the plane of graphene layers and they are modeled as space-frame structures.The interaction between two layers is modeled by Lennard–Jones potential for not only two apposite atoms but also for all adjacent atoms.The frequencies and mode shapes for cantilever and bridged bilayer graphene as well as monolayer graphene(MG)are obtained by a finite element approach.Results show that the interlayer shear interaction has considerable effect on vibrational behavior of BG and increases the natural frequencies,because existence of horizontal forces(shear forces)that prevent the lateral displacements.It can be seen that the interaction between two layers are more considerable in second mode because the curvature and variation of displacement are higher in second mode.Also it can be found that changing of mode shapes has considerable effect on shear interaction.展开更多
This paper presents a global optimization method focused on planetary gear vibration reduction by means of tip relief profile modifications.A nonlinear dynamic model is uspd to study the vibration behavior.In order to...This paper presents a global optimization method focused on planetary gear vibration reduction by means of tip relief profile modifications.A nonlinear dynamic model is uspd to study the vibration behavior.In order to investig ate the optimal radius and amplitude,Brute Force method optimization is used.One approach in optimization is straightforward and requires considerable computation power:brute force methods try to calculate all possible solutions and decide afterwards which one is the best.Results show the influence of optimal profile on planetary gear vibrations.展开更多
文摘In this article,the interlayer shear effects on vibrational behavior of bilayer graphene(BG)are studied by using the molecular mechanics(MM)simulation.Investigation on mechanical behavior of graphenes has recently attracted because of their excellent properties.MM simulation is exploited for modeling of covalent bond in the plane of graphene layers and they are modeled as space-frame structures.The interaction between two layers is modeled by Lennard–Jones potential for not only two apposite atoms but also for all adjacent atoms.The frequencies and mode shapes for cantilever and bridged bilayer graphene as well as monolayer graphene(MG)are obtained by a finite element approach.Results show that the interlayer shear interaction has considerable effect on vibrational behavior of BG and increases the natural frequencies,because existence of horizontal forces(shear forces)that prevent the lateral displacements.It can be seen that the interaction between two layers are more considerable in second mode because the curvature and variation of displacement are higher in second mode.Also it can be found that changing of mode shapes has considerable effect on shear interaction.
文摘This paper presents a global optimization method focused on planetary gear vibration reduction by means of tip relief profile modifications.A nonlinear dynamic model is uspd to study the vibration behavior.In order to investig ate the optimal radius and amplitude,Brute Force method optimization is used.One approach in optimization is straightforward and requires considerable computation power:brute force methods try to calculate all possible solutions and decide afterwards which one is the best.Results show the influence of optimal profile on planetary gear vibrations.
