Dynamic Modeling And Vibration Characteristics Research Of Porous Rotating Drum-Blade Reinforced With Graphene Nanoplatelets

In modern industry,a drum-blade which is composed of hollow thin wall drum and blade belongs to kind of typical structure in rotating machinery,such as wind power generator,helicopter rotor,wind turbine,etc.The environmental conditions and actual working status of rotating machinery is relatively comprehensive,as a result,the dynamic analysis of drum-blade is of great importance.With the raise of new composite materials,exploring the influence of functionally graded material properties on structural vibration characteristics of drum-blade is able to enhance the application of new composite materials to rotating machinery,which is also beneficial to the actual application of drum-blade structure in projects.This paper raises a new theoretical model mainly in the light of the drum-blade in rotating machinery,this kind of theoretical model is able to analyze the structural vibration characteristics of porous rotating thin wall drum-blade reinforced by graphene nanoplatelets(GPLs).Firstly,it introduces the survey background of functionally graded material properties of graphene and structural dynamics of drum-blade and respectively narrates the current survey status at home and abroad on dynamic analysis of functionally graded material strengthening drum structures and rotating blades.Then take an analysis on the more complicated drum structure in drum-blade structure,determining functionally graded material properties and raising reasonable theoretical analysis method as well as taking comparative analysis on the results of calculation.After that carry out theoretical modeling on double blades structure of drum which depends on the cylinder shell and beam rotor system.This model takes the coupling effect between two elastic components in consideration,study the influence of blades size and drum size on free vibration characteristics of drum-blade structure.Next,this paper raises the theoretical model of graphene strengthening porous rotating thin wall drum-blade,which taking Euler-Bernoulli beam theory and Donnell shell theory respectively establishes mathematical model on blades and drum,taking advantage of HalpinTsai model,typical mechanical property of foam metal and the rule of mixture determines effective material characteristic of continuously changing along the thickness of blades and drum.The Lagrange’s equation is adopted to derive the equations of motion which are then solved by employing the substructure mode synthesis method and the Galerkin method.Having studied the speed,porosity distribution pattern,GPLs distribution pattern,weight fraction of graphene,thickness of GPLs,surface area of GPLs on free vibration characteristic of drumblade structure.Then considering during the process of blade rotating,the vibration response of whole structure which drum-blade structure is under the influence of aerodynamic load.What’s more,also studies the influence of functionally graded material parameters on the bend of blades at a constant speed.Study shows that this analysis method is beneficial to analyzing vibration characteristics of drum-blade structure of metal and new composite materials,little graphene added can enhance the mechanical property and rigidity of drum-blade structure greatly,applying functionally graded material reasonably can strengthen the effect of graphene greatly.The result has a great importance on the design of porous rotating drum-blade structure reinforced with graphene nanoplatelets.