NEXT PAGE =>

A DESIGN METHODOLOGY

DEFINITIONS

State Variables

Variables determining the state of system under study

Design Variables

State variables chosen as independent variables

Design Degrees of Freedom

Number of design variables which must be specified to give a solution

Design Space

Totality of all syntheses studied. and are of 5 main types:
  1. Functional Constraints
  2. Fixed Constraints (Design Parameters)
  3. Inequality (Performance) Constraints
  4. Design Space & Process Restrictions
  5. Material Limitations

Feasible Region

Design space where all constraints are satisfied

Design Requirements
(Design Constraints)

Limitations placed on the design

Design Criteria
(Design Objectives)

State (dependent) variables to be optimized

Design Parameters

State variables used to define the criteria functional constraints and the equations for the inequality constraint varialbles

Criteria Space
(Objective Space)

Totality of all optimal criteria.