REG NASA-LLIS-6357-2012 Lessons Learned - Thermal Environment Body Point Numbering System.pdf

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1、Public Lessons Learned Entry: 6357 Lesson Info: Lesson Number: 6357 Lesson Date: 2004-01-1 Submitting Organization: MSFC Submitted by: Mark DAgostino Subject: Thermal Environment Body Point Numbering System Abstract: Vehicle external thermal environments are often defined for discrete body point for

2、 zones. STS plume and aerodynamic heating data books used body point numbers that were inconsistent in length and are very occasionally repeated. This can cause confusion for users of these environments. Description of Driving Event: When STS environments were reviewed and used, it became apparent t

3、hat some body point numbers are 3 digits long, while others are 4, 5, or even 6 digits in length. No underlying system was employed throughout the life of the program. In a few instances, duplicate body point numbers were used for elements such as the Orbiter and the External Tank. This is highly un

4、desirable because it could cause confusion, or even misapplication of inappropriate design environments. In the worst case, this could lead to a catastrophic event if not caught during the design process. Lesson(s) Learned: It is preferable to use a numbering system that has enough capacity to evolv

5、e with the need for additional body points as the system is utilized and operated. This system needs to be carefully described early in a program life cycle. Users of the system must exercise discipline to “stick with” this system, even when the expedient path might tempt them to do otherwise. Recom

6、mendation(s): Ares and Space Launch System (SLS) external thermal environments are developed using a six digit numbering system that is tied to the axial and circumferential location on the vehicle, and the type of body point being analyzed. This system has proven adaptable to both programs. This sy

7、stem, or a similar one, should be used on all launch vehicle programs. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Six digit system based on vehicle location and type of point Used for Ares I, V, I-X, and SLS design, test and flight gauges Differ

8、ent prefixes, allows easy comparison and correlation Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Held up well over 7 years of use Figure 1: Body Point Numbering Chart Evidence of Recurrence Control Effectiveness: The body point numbering system w

9、as used with good success on the Ares program and is now being implemented on SLS. Documents Related to Lesson: N/A Mission Directorate(s): Space Operations Exploration Systems Additional Key Phrase(s): 0.Engineering design and project processes and standards 1.Launch Systems 0.Ground processing and manifesting Additional Info: Project: Space Shuttle Approval Info: Approval Date: 2012-03-21 Approval Name: mbell Approval Organization: HQ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-