Download
1 / 4
40 likes | 216 Views
This guide outlines the development of an Objectives-Constraints Tree, a critical tool in engineering design that visually represents design objectives and constraints. It begins with the Attributes List and utilizes the Pairwise Comparison Chart (PCC) to establish a hierarchy. Primary objectives form the first tree level, while secondary objectives are grouped beneath them. Constraints are categorized as subsets of related objectives, with a clear distinction made between objectives (rectangular boxes) and constraints (ovals). Examples of an Objectives-Constraints Tree for ladder design are provided for better understanding.
E N D
Developing an Objectives-Constraints Tree Creating a graphical representation of design objectives and constraints Taken from engineering design: a project-based introduction by dym & little
The development of an Objectives-Constraints Tree proceeds from the Attributes List and PCC. • The hierarchy of the Objectives-Constraints Tree comes from the results of the Pairwise Comparison Chart. • Primary objectives are listed in the first level of the tree. • Secondary objectives are grouped as subsets of the primary objectives. The same concept holds for subsequent levels of the tree. • Constraints should be listed as a subset of related objectives. • The other objectives and constraints listed in the tree come from the Attributes List. • Objectives are listed in rectangular boxes, and constraints are listed in ovals.
Below is an example (not exhaustive) of an Objective-Constraints Tree for a ladder design. Objectives Constraints
Below is an example (not exhaustive) of an Objective-Constraints Tree for a ladder design. Subsets of “safe” Subset of “marketable” Objectives Constraints
