1、Lessons Learned Entry: 1494Lesson Info:a71 Lesson Number: 1494a71 Lesson Date: 2005-02-05a71 Submitting Organization: MSFCa71 Submitted by: William W. Vaughan, Ph.D.Subject: Natural Environment Design Requirements for a Program: Control and Single Focus Contact Abstract: Practically all programs and
2、 projects are involved with flight through the atmospheric and space environments. There are usually several groups, both industry and government, involved in the design and development of the launch vehicle and spacecraft. Having a coordinated and consistent set of natural environment input and des
3、ign requirements, tailored to meet the mission requirements for the space vehicle is critical. Not only from a time and cost aspect, but from a technical view also. Otherwise, the comparisons of various trade-off analyses for the vehicles structure, control, thermal, etc. designs will not produce vi
4、able results from which management decisions can be made.Description of Driving Event: For the Apollo Block I/II development, the contractor was provided a NASA report containing statistics for inflight winds over Cape Canaveral without the required specific design wind values being specified for us
5、e. The result was an extensive re-do of the analyses and design work to meet the vehicle mission requirements. The ISS contractor utilized an in-house Orbital Density Model for on-orbit analyses which differed from the NASA model specified for use. This resulted in different calculations for ISS res
6、ponse analyses by the various groups involved. Both of these issues were resolved by recognition and establishment of a single Control Point with responsibility for focus on natural environment definitions and control of requirements for the Space Shuttle and ISS. In addition, this provided a common
7、 source for interpretation of the natural environment requirements for the design of these vehicles.Lesson(s) Learned: The specification of a coordinated and consistent set of Natural Environment definitions and design requirements is important for program studies relative to vehicle design trade-of
8、fs and development Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-requirements., given the significance of Natural Environment inputs. This is especially true when there are several organizations involved in the vehicle development activities. It is
9、 critical that a single Control Point be established for Natural Environment inputs to be used in the design and development of a space vehicle. For more information see Atmospheric/Space Environment Support Lessons Learned Regarding Aerospace Vehicle Design and Operations.Recommendation(s): All NAS
10、A Flight Programs, early in their implementation, should establish one Point of Control for natural environment definition, interpretation, and design requirements (see Environments Group Support). Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: NASA-HDBK-1001Mission Di
11、rectorate(s): a71 Exploration Systemsa71 Sciencea71 Space Operationsa71 Aeronautics ResearchAdditional Key Phrase(s): a71 Administration/Organizationa71 Configuration Managementa71 Environmenta71 Flight Equipmenta71 Flight Operationsa71 Ground Equipmenta71 Ground Operationsa71 Hardwarea71 Independen
12、t Verification and Validationa71 NASA Standardsa71 Payloadsa71 Policy & PlanningProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-a71 Program and Project Managementa71 Research & Developmenta71 Risk Management/Assessmenta71 Safety & Mission Assurancea7
13、1 Spacecrafta71 Standarda71 Test & Verificationa71 TransportationAdditional Info: Approval Info: a71 Approval Date: 2005-01a71 Approval Name: Lisa Carra71 Approval Organization: MSFCa71 Approval Phone Number: 256-544-2544Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
