ENGR 100 Lecture Notes - Lecture 14: Fuselage
Document Summary
Function means tree (6. 2. 4) is a graphical representation of the basic and secondary functions (and sub-functions) associated with a design. Top level shows the basic function; each of the succeeding levels alternate between means and the secondary functions made necessary by the means. Functions are shown as rectangles and means as trapezoids. Different fonts may be used in conjunction with different shapes (see figure 6. 4) The tree is to relate what the design must do (a function) and how we may do it (means) We have learned that for every objective there must be a metric to measure the achievement of the objective. Now for every function we need specifications. Specifications, like constraints, must be met in order for a design to be considered successful. Prescriptive specifications: specify values for attributes for a design. For example: a reusable juice container must be made of 50% recyclable plastic. Procedural specifications: specify procedures for calculating attributes.
