Research On Stacer Technique For Deployable Boom Device Applied In The Electromagnetic Monitoring Satellite

This subject comes from Beijing Institute of Spacecraft System Engineering CAST.According to the core component stacer of spiral deployable boom device for the electromagnetic monitoring satellite,based on flight application requirements of the first self-developed electromagnetic monitoring satellite in China(see Appendix for application),the preparation,properties and related application technology of the stacer are studied systematically.The research on related technology is of great value to the application and popularization of the new space deployable mechanism in China.At present,the forming process of stacer has passed the process appraisal of Beijing Institute of Spacecraft System Engineering CAST.Stacer with its forming equipment and folding equipment has already passed acceptance check,and application requirements are satisfied by stacer obtained in CSPB process.The main contents of this paper are as follows:The continuous forming process by compositing stretch and press bending(CSPB)is proposed.According to the cold forming method for preparing stacers,it solves the problem that the size accuracy of such product is greatly affected,and the performance is degraded when the traditional method is used for its stabilization treatment after cold forming.In this paper,the variation law of stress,strain and residual stress in the CSPB process for stacers is studied.Space environment thermal simulation tests and natural aging treatment tests are used to verify the service capability of the stacer.The results show that the CSPB method is effective in controlling the residual stress of cold formed stacer,and the stacer obtained can well satisfy the stability requirement of flight applications in satellites.In addition,according to the CSPB method,the theoretical analysis model following Hill'48 anisotropic yield criterion is established.The control method and the structure of stacer forming equipment,including uncoiler,deviation rectifying rollers,forming device,recoiler,and so on are analyzed,and the first set of stacer forming equipment is successfully developed.The problems such as constant control of post tension without tension roller and deviation control under large lateral force have been solved.With the forming equipment,the forming process of stacer is analyzed.Stacer part of 6m length with excellent performance is successfully obtained in China for the first time.Taking experiment as the main method,combining with numerical simulation method,the forming process and process parameters for stacer by CSPB are studied.The influence of the key process parameters,such as die gap,forming angle,post tension,forming speed,punch radius,deviation rectifying force,strip width and thickness,on the forming process and forming diameter is obtained.Die gap is the main controlling factor of stacer forming diameter.The stacer helix angle is determined by the forming angle.When forming speed is less than 700 mm·min-1?post tension is in the range of 300N-1700N,and punch radius is smaller to 0.5mm,it is more favorable for the precise control of forming diameter of stacer.The principle of compound action of spring storage canister rotating and axial compression is proposed,and automatic colleting process for stacer is studied.Based on the principle,the kinematics model is established.The coordination relation formulas between the key colleting process parameters are given.Automatic colleting equipment is developed successfully.Using the equipment,some data matching parameters are established.The automatically collecting process for 6m stacer is realized.According to tests of the collecting results,the purpose of colleting stacers automatically and accurately is achieved.The test methods of stacer performance are analyzed.The stacer appearance parameters(such as diameter and helix angle)and the key service performance parameters(such as deploying force,bending rigidity and directivity)are tested and analyzed,and the key influence factors and influence rules for the above performance are studied.The research results show that stacer obtained by the CSPB process has approximately constant mechanical output in the decay phase.has the bending rigidity close to thin-walled tube with the same wall thickness,and has the direction angle of less than 0.5 degrees.The stacer obtained has excellent capability of expansion driving,support on orbit and positioning.In addition,it is overall beneficial to improve the key service performance of stacer with the increase of strip width,thickness,helix angle and the decrease of natural diameter.