1、Lessons Learned Entry: 0321Lesson Info:a71 Lesson Number: 0321a71 Lesson Date: 1993-05-26a71 Submitting Organization: MSFCa71 Submitted by: Fisher, MarkSubject: Spring Actuated Deployables, Design Considerations Description of Driving Event: Data indicates that there have been several deployment fai
2、lures which were attributable to inadequate design.Lesson(s) Learned: Spring actuators for deployables are susceptible to many single failure modes which must be considered in the design.Recommendation(s): Provide the following features in the design of spring operated deploy mechanisms: redundant r
3、elease mechanisms, guide provided for spring, spring and guide lubricated with low outgassing lubricant, few pivots (decreases static friction and lowers spring stored energy), spring stress no greater than 80% of the spring material yield stress damper incorporated into any high energy spring (decr
4、eases transient shocks which could damage sensitive instruments).Evidence of Recurrence Control Effectiveness: There have been fewer deployment failures since incorporation of the actions recommended. The specific figures were not provided in the back-up data.Documents Related to Lesson: N/AProvided
5、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Mission Directorate(s): N/AAdditional Key Phrase(s): a71 Hardwarea71 Parts Materials & ProcessesAdditional Info: Approval Info: a71 Approval Date: 1994-05-26a71 Approval Name: Fisher, Marka71 Approval Organization: EP22a71 Approval Phone Number: 205-544-9503Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
