| As the main carrier to realize the function of reconnaissance,monitoring,shoot correction and strike,airborne optoelectronic pod is the core equipment used in modern air combat war,whose related technology research has been paid attention to.The main factors affecting the accuracy and quality of the optical imaging system carried on the photoelectric pod include internal vibration and external vibration.In this paper,the internal vibration level of the photoelectric pod is reduced to a very small level through precise mechanical design,processing and assembly technology.The vibration isolation system is designed to isolate the external vibration excitation given by the UAV.By means of theoretical analysis,simulation analysis and experimental verification,the vibration isolation system can meet the requirements of vibration isolation well.By analyzing the functional requirements,working principle and key technology of the photoelectric pod,the structure of the pod is designed.The static and dynamic analysis of the azimuth base structure is carried out,which is directly connected with the vibration isolator.The simulation results show that the structure meets the strength conditions.Then,according to the vibration isolation requirements of the project,a preliminary vibration isolation scheme is designed.Combined with the actual working conditions,the dynamic model of the photoelectric pod vibration isolation system is established,and the transfer function of the linear vibration of the photoelectric pod to the excitation vibration of the UAV is obtained after the decoupling analysis.In order to quantitatively analyze the influence of the parameters of the vibration isolation system on its vibration isolation performance,a vibration model of the two degree of freedom vibration isolation system is established.It concludes that the larger the stiffness,damping and installation span deviation of the vibration isolators,the larger the amplitude of the transfer function of the angular vibration of the photoelectric pod to the linear vibration of the UAV.Through the analysis of the mathematical model of the vibration isolation system,the parameters of the vibration isolation system are determined under the guidance of the vibration isolation theory.After parameters design of the vibration isolation system,the vibration simulation analysis is carried out in ADAMS/Vibration module.The analysis results show that the theory above is correct and the design of vibration isolation system is effective.Because the two kinds of vibration isolators are nonlinear vibration isolators,the vibration isolators selected only according to the parameter requirements may not be able to meet the actual working conditions.So carrying out the static experiment and dynamic frequency sweep vibration experiment are essential.According to the experimental results,the metal rubber vibration isolator is finally selected in this project.Then two layouts of metal rubber isolators with symmetrical layout and span deviation are designed,and the vibration experiment is carried out.The experimental results verify the correctness of the previous theoretical analysis and simulation results.Combined with the feedback of practical application in the project,the vibration isolation system designed can meet the vibration isolation requirements of the photoelectric pod.In this paper,the vibration isolation technology and experimental research of the photoelectric pod makes the vibration of UAV effectively isolated,and improves the quality and stability accuracy of the optical imaging system,which is of great significance to improve the air reconnaissance and combat ability. |
