Analysis Of Vibration Characteristics Of Thin Film Structure Based On Additional Mass

The space membrane structure is an inflatable and unfolding structure,which has the advantages of small launch volume,light weight,and high deployment reliability.It has a wide range of applications in the aerospace field.The main load it receives during orbit is the pulse load generated during orbit maintenance.The heat generated by the in and out of the shadow causes the load generated by the deformation.Based on the research on the film structure at home and abroad,this paper studies the influence of additional mass on the vibration frequency of the film structure,and controls its vibration characteristics accordingly.Firstly,under the condition of satisfying the basic assumptions of the membrane structure,through theoretical analysis,the theoretical solution of the free vibration of the square membrane and the circular membrane is obtained.The theoretical analysis model is calculated by the finite element analysis software ABAQUS to prove the correctness of the simulation method.Two methods of applying prestress are studied,namely side load and temperature load.The vibration frequency calculated by the two methods of prestressing is compared with the theoretical solution.There are many applications of the thin film structure,a thin film at different heights of the spacecraft,the air has a significant influence on the vibration characteristics,the use of the basic principle and structure coupling CEL stream analysis method of finite element analysis,to study the vibration of air on the structure.Secondly,since the main factors affecting the vibration frequency of the membrane structure are stiffness and quality,this paper focuses on these two aspects.Because the film structure has great flexibility and no rigidity,it needs to apply a certain amount of prestress to provide rigidity,but the film has a quantitative tensile strength,and excessive prestress cannot be applied to the film to prevent plastic deformation or even damage.This article provides a solution,that is,adding a local reinforcement strip mechanism to the film structure,you can choose a light weight but high tensile strength material,by applying prestress to it and changing the local thickness to effectively improve the local stiffness of the film structure.And the vibration frequency can be controlled by the arrangement of local reinforcement strips.The additional mass also has an effect on the vibration frequency of the film.This paper studies the influence of the shape and area of the additional mass of equal mass on the vibration frequency of the film,which can control the vibration frequency of the film to a certain extent.Finally,through experiments,the vibration mode diagram and time-displacement curve of the film vibration were obtained by using the digital speckle method,and the vibration frequency of the film was calculated by FFT,which verified the accuracy of the simulation analysis.The vibration frequency of the film can be well controlled by the additional mass,the structure is simple,the weight is light,the control effect is good,and it has broad application prospects.