Design and experimental research of electromagnetic hold down and release mechanism
In recent years,with the development of space-application low shock Hold Down and Release Mechanism(HDRM)represented by the shape memory alloy and the thermal knife,such problems as impact and pollution caused by pyro-technics have been solved.However,such setbacks as poor unlocking synchronization and inadequate adaptability to temperature cannot be ignored.In this article,an electromagnetic triggered HDRM is proposed.The prototype is subject to the functional tests,including the load of the locking force,the shortest charging time,the unlock synchronization,the unlock shock,the un-lock in the thermal vacuum environment,and so on.The results show that the shortest charging time under the working condition of 10 000 N locking force is 0.05 s;the release impact acceleration is less than 100g within 2 000 Hz;the 0.104 s pyro actuator power can be compatible;the synchronization of multiple unlocking devices is less than 0.02 s.They be unlocked normally under three working conditions:the low temperature-50 ℃,the normal temperature 28 ℃,and the high temperature 90 ℃ during the thermal vacuum process.The scheme,with the advantages of light weight,compact size,fast response to unlock,ability of recy-cling,minor unlock impact,desirable unlock synchronization and good environmental adaptability,can be widely applied in the engineering field.
space applicationlow shockelectromagneticsegmented nuttest and experiment
万方数据
维普
