Research On High Reliability And Long Life Shutter Technology In Space Environment

Sky survey observation is an important means to obtain information about the universe,and it is also the focus of competition among major countries in the world in the field of space.my country started late in this field and is still in the catching-up stage.In order to catch up with the world's advanced level,it is becoming more and more urgent for our country's sky survey equipment to make further breakthroughs in technical indicators and mission indicators such as observation accuracy,sky coverage,and operational life.Facing this demand,increasing the focal plane size of the sky survey equipment is a very important means.With the increasing size of the focal plane,how to design a shutter that fits the focal plane and whose reliability and life are guaranteed has become a very challenging subject.At home and abroad,none of the existing or proposed shutters can simultaneously meet the requirements of large size,high reliability,and long life,and the use environment is space and other requirements.Therefore,it is urgent to carry out research on large-size,high-reliability and long-life shutter technology based on the characteristics of the space environment.In my country's sky survey plan,the focal plane size of the multi-color imaging and seamless spectral sky survey module of multi-functional optical facilities has reached 500mm×650mm.The required shutter needs to be in orbit for ten years,and the number of opening and closing times needs to exceed 1 million.None of the existing or proposed spatial shutter solutions can meet the above-mentioned index requirements at the same time.Therefore,this article focuses on the design of a highly reliable and long-life shutter for a multi-color imaging and seamless spectral survey module for a multi-functional optical facility with a focal area of about 500mm×650mm.The main research content includes the following parts:1.The structural characteristics of the existing main telescope shutters are analyzed.Due to the large focal surface size of this shutter,there is no application precedent at home and abroad,and the requirements for its reliability and life are very high.Therefore,we have analyzed and discussed the structure of the existing main telescopes,hoping to obtain useful inspiration from it and apply it to this shutter.In the end,after rigorous analysis,we believe that,in the face of the realistic requirements of large size,high reliability and long life,none of the existing main shutter structures can be fully satisfied,so we innovatively proposed a split shutter structure.2.In view of this new shutter structure,considering the special requirements in the space environment,the main parts of the shutter are designed in detail from the perspectives of function,performance,and specific schemes to meet the requirements of the reliability and life of the shutter.Try to establish a reliability model for the new shutter structure from both a quantitative and a qualitative perspective,laying the foundation for subsequent reliability research.3.On the basis of the reliability model established before,we have clarified the weaknesses of the shutter structure.We selected the more prominent weak link that the shutter blades are prone to shake in the non-operating state and cause damage to the shutter structure to carry out in-depth discussion,and propose a novel shutter blade locking scheme,which solves this weak link and greatly improves The overall reliability of the shutter mechanism.4.In order to verify the overall reliability and life performance of the shutter structure,we conducted a life test for the entire shutter.We have designed a life test program,fully taking into account the complex space environmental factors that the shutter mechanism faces when it is working in orbit.The life test was successfully completed and the results were satisfactory.This result also shows that the shutter mechanism we designed can meet the target requirements,creating a major breakthrough in this field.This article has carried out a complete and more detailed discussion and research and summed up some experience in all stages of the formulation of the main indicators of the shutter,the proposal of the main structure,the demonstration of the structural mechanics,the elimination of the main weak links,and the verification of the final shutter,Which can provide reference for the proposal and verification of similar new structures in the future.