Research On Lightweight Of Seeker Common Caliber System

In the wake of developments in science and technology development the accuracy,timeliness,and stability of information acquisition in modern warfare have put forward higher and higher requirements.At the same time,as the "eye" of information acquisition,how to "see" farther,more accurately,and more quickly has also become the key to the development of the guidance system.The improvement of the efficiency of the guidance system can greatly improve the acquisition of target information in modern warfare and seize the initiative on the battlefield.The complex environment and external interference in the modern battlefield make a single-mode guidance system unable to meet the requirements of precise and efficient guidance.The reliability and timeliness of the more common infrared or laser detection systems in some complex and harsh environments is far from that of dual-mode composite systems.The use of an infrared and laser composite system can effectively make up for the shortcomings of a single system,but the integration of multiple systems into a collective system puts forward higher requirements for the design and optimization of the opto-mechanical system.To improve the space utilization of the flying carrier and achieve the composite of multiple optical systems in a limited space,this paper adopts a cassette commonaperture design for the infrared laser composite guidance system.In the cassette common-aperture system,the structure of the reflector,flexible support,and truss determines the performance of the entire cassette system.Therefore,this article designs and optimizes the primary and secondary mirrors,their supporting structures,and the truss structure.This thesis starts from the domestic and foreign research background and significance of the composite guidance system and elaborates on the structural design of the common-caliber system at home and abroad and learns in detail the advantages and disadvantages of related technologies at home and abroad and focuses on the primary and secondary mirrors and trusses in this article.Institutional design and optimization.Taking the primary and secondary reflector components in the infrared laser composite guidance system as the research object,to ensure the accuracy of the reflector surface,the rigidity of the truss and reduce the quality of the components,the material selection,three-dimensional modeling,and three-dimensional modeling of the primary and secondary reflectors and their trusses are the objectives.Optimized design and simulation verification.To complete the design of the components in a limited space and improve the reliability of the components,this paper mainly focuses on the following research contents for a dual-mode seeker.(1)According to the design of the lightweight design of the optical and mechanical structure of the composite guidance system,carry out relevant data investigations,understand the current research status at home and abroad,select the appropriate composite guidance system,and determine the main content of the design: the choice of mirror materials,mirrors Shape design,reflector cross-section design,main support structure and flexible support,etc.Aiming at the design in this article,analyze the main problems and solutions.(2)According to the requirements of the composite guiding optical system in this article,and comparing several common optical systems,finally choose the optical system suitable for this article.At the same time,it is necessary to analyze and optimize the dynamic environment,static environment and thermodynamic environment of the launch and operating environment of the entire airborne system.(3)The material selection and structure design of the reflector,and the lightweight design of the primary and secondary mirrors.In the optimization process,the multiobjective optimization method is used to optimize the overall quality of the mirror under the premise of ensuring the surface accuracy and rigid body displacement.(4)By analyzing the common support methods of mirror support and flexible support at this stage,select the appropriate support method according to the design requirements and environment of this paper.And carry on the material selection a mechanical analysis to the supporting structure.Design goals: The accuracy of the main mirror surface is 60% higher than the requirements for use,the accuracy of the secondary mirror surface is 80% higher than the requirements for use,the weight reduction rate of the main mirror is more than 80%,and the natural frequency of the overall structure is higher than 100 Hz.(5)Finally,perform dynamic and static mechanical analysis,modal analysis,thermodynamic analysis,overload motion analysis,etc.of the designed primary and secondary mirrors,supporting structures,and truss structures to verify the dynamic and static environments of the designed mirrors.Stiffness and stability in hot and cold environments.The analysis results show that the reflector assembly has good performance and meets the design requirements.