REG NASA-LLIS-1585--2004 Lessons Learned - Next Generation Launch Technology (NGLT) Rigorous Systems Engineering is Needed in Technology Projects.pdf

1、Lessons Learned Entry: 1585Lesson Info:a71 Lesson Number: 1585a71 Lesson Date: 2004-07-01a71 Submitting Organization: MSFCa71 Submitted by: Donald Dugala71 Authored by: Stephen CookSubject: Next Generation Launch Technology (NGLT)/Rigorous Systems Engineering is Needed in Technology Projects Abstrac

2、t: SE&A should be executed within technology projects to ensure timely decisions (which are supported with an appropriate depth of analysis e.g., cost/benefit) and coordinated with top-down program-level systems engineering and analysis/requirements flow-down. Description of Driving Event: It was no

3、ted by the TBCC Project that timely detailed systems analyses/engineering was needed within projects to make effective cost/benefit decisions regarding configurations and technologies. For example: early in the TBCC Project, legacy hardware (HiMATE augmentor rig) was proposed for flame stability tes

4、ting. However, cost benefit analysis, systems analysis, and leak testing of hardware showed that new rigs (flame stability and annular/sector rigs) would be technically beneficial and financially prudent. The RS-84 Project identified a single-shaft turbo pump as the baseline at the time the proposal

5、 was negotiated. Over time, it was discovered that a single shaft for the turbo pumps would require significantly more risk management than previously identified. The systems engineering process allowed this to be incorporated into the program decision-making process. During the Northrop Grumman Rea

6、ction Control System (RCS) Liquid Oxygen (LOX)/Ethanol testing, the project experienced three occurrences of a failure of the disilicide coating on the C103 chamber. The project team was under significant pressure due to schedule delays, so an attempt was made to apply a quick fix of the problem wit

7、hout fully understanding the issues. However, the Project Office required the contractor to perform a full fault tree analysis of the problem before attempting any solutions. The team subsequently determined that a new Platinum-Iridium (Pt-Ir) chamber, rather than the coated C103 chamber, could be u

8、sed to meet the test objectives without having to solve a coating problem not in the task objectives. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Lesson(s) Learned: For the TBCC Project, detailed contractor analyses/engineering, complemented by p

9、arallel NASA studies, proved effective in Project decision-making. The RS-84 Project continued to use a systems engineering process throughout the life of the Project, continuously questioning and reevaluating previous decisions, since decisions made early in the project may need revision once more

10、information is gathered. Applying a disciplined systems engineering process helps to manage stress and emotion of the moment to find solutions not evident while working the details. Good systems engineering practices help identify these details and ensure the overall system works well. Recommendatio

11、n(s): SE&A should be executed within technology projects to ensure timely decisions (which are supported with an appropriate depth of analysis e.g., cost/benefit) and coordinated with top-down program-level systems engineering and analysis/requirements flow-down. Programs should ensure the systems e

12、ngineering discipline is applied even when stress is high and time is short. Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AMission Directorate(s): a71 Exploration Systemsa71 Aeronautics Researcha71 Space OperationsAdditional Key Phrase(s): a71 Administration/Organi

13、zationa71 Financial Managementa71 NASA Standardsa71 Policy & Planninga71 Research & Developmenta71 Risk Management/Assessmenta71 Safety & Mission AssuranceProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Additional Info: Approval Info: a71 Approval Date: 2006-04-10a71 Approval Name: dkruhma71 Approval Organization: HQProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-