Thermally Induced Vibration And Vibration Control Of FGM Rotating Beams With Enhanced Active Constraint Layer Damping

Many flexible aerospace components for large-scale motion,including solar panels,space manipulators,etc.,can be regarded as rigid-flexible coupled dynamic structures.The physical model can be simplified to a central rigid body-rotating beam model that can describe both the large-scale motion of rigid bodies and the deformation of flexible parts.Once the vibration of this kind of large flexible structure is excited,it takes a long time to stop,and these problems bring huge costs to aerospace work,so the large deflection space manipulator vibration problem has attracted a large number of scholars to study it.Considering that such structures are often exposed to high temperatures,the thermal stress caused by unevenly distributed temperature sites will cause deformation or even damage to the structures,which will affect the system dynamics.In order to meet the actual work needs,advanced intelligent materials have been widely used in the aerospace field.Therefore,it is necessary to conduct in-depth research on the multiphysics dynamic modeling theory of space flexible robot systems containing advanced composite materials.Aiming at the problem that the space flexible manipulator is prone to thermal vibration,the space flexible manipulator is simplified into a central rigid body-rotating beam model,and the enhanced active constrained layer damping(including viscoelastic damping layer and piezoelectric constraining layer)is partially covered on the surface of the flexible beam.Among them,the edge element is equivalently modeled as spring stiffness and tip mass.The base beam is a functionally graded material(FGM)beam which is suitable for temperature fields.Based on the above conditions,the vibration control of the system under the impact of thermal load is studied.This paper consider two cases where the FGM material properties are distributed along the axial direction or the thickness direction.Then based on the rigid-flexible coupling dynamics modeling theory,the rotating functionally graded beam in the temperature field is dynamically modeled and derive the kinetic equation according to the Lagrange equation of the second type.Then use MATLAB to write dynamics program,and use ABAQUS numerical simulation software to model the model in this paper,verify the accuracy of this model.The vibration analysis of the model in this paper is carried out,and the modal modes of the composite beam are obtained,and the vibration convergence is analyzed.Finally,numerical analysis methods are used to study the influence of the position and coverage of the damping patch,control gain,end element mass,equivalent spring stiffness,temperature,model width and central rigid body radius on the end deformation of the structure.After comparison,several factors that have a greater impact on structural vibration are found,including control gain,viscoelastic material layer thickness,temperature,etc.The structure can be optimized according to the research results to achieve the purpose of vibration suppression.