0 Structure Design HW #2 祝飛鴻 12/12/2008

1  “Process” is a step-by-step planning in resolution of problems with identified inter-relation and sequence between the steps.  When facing problems, the common mistake is to immediately jump into the execution details without an overall, from beginning to end, problem solving “process”.  Depends on the situation, the “process” may not need to be in detail to start with. The “process” can be modified or enhanced during execution. Concept of Process

2  Without a proper pre-defined “process”, most likely, it will lead to lengthy iteration in solving problems.  The “process” can also be used to align all the involved parties to work with the same pace. This is extremely important for large scale projects, e.g. satellite design. Concept of Process  “Process” can be presented as flow chart with waterfall concept, i.e. top down from coarse to detail.

3 Following chart provide a typical process related to the spacecraft structure design. It is not intended to be a standard solution, but rather to be a reference information for the homework problem. Structure Design HW #2 Q: Generate a detail flow chart for spacecraft structure design, from requirements to verification.

4 Spacecraft Structure Design Requirements & Constraints Design & Analysis Verification & Validation Waterfall Structure Mission Driven LV Driven System Driven Configuration Design Stress Analysis Dynamic Analysis Special Analysis Verification Plan Test Plan Test Procedures Level 1 Level 2 Level 3 Lift-off wt Fairing Size Launch Loads Acoustic Loads Random Loads Quasi-static Loads Shock Loads Level 4 Level 5

5 Mission OrbitTarget wt & Size Conceptual Design Candidate LV Wt LimitationFairing SizeLaunch Loads Component Selection Wt & SizeFOVOrientation System RequirementsMission Requirements Configuration Design Finite Element Model Stress Analysis Dynamic Analysis Coupled Loads Results Design Verification Environmental Test Min Freq Reqt Test Plan & Procedures Verification Plan Material Selection Preliminary Sizing