ME Tools Design

Design Exam

Characteristics of An Engineering Science Problem

1. Problem statement is compact and well-posed 2. Problem has a readily identifiable closure 3. Solution is unique and compact 4. Problem uses specialized knowledge

What is Engineering Design

Methodical approach to solving larger more complex problems

ABET Definition of Design

The process of devising a system, component, or process to meet desired needs. Decision making process, in which the basic sciences and mathematics, and engineering sciences are applied to convert resources optimally to meet a stated objective. Establishment of objectives and criteria, synthesis, analysis, construction, testing, evaluation.

ABET Design Curriculum

Features: develop student creativity, use of open ended problems, consideration of alternative solutions, and feasibility considerations

Nine Step Model of Design Process

1. recognizing the need

2. defining the problem

3. planning the project

4. gathering information

5. conceptualizing alternative approaches

6. evaluating the alternatives

7. selecting the preferred alternative

8. communicating the design

9. implementing the preferred design

Design Step Two

Defining the Problem: goal, objectives, constraints

Define System

Collection of elements that interact to fufill a function

Define Boundaries

Separate systme from environment

Define Components

Smallest identifiable element of system

Define Subsystems

Collections of components

Issues faced when using a custom part

Require extra time for fabrication, very expensive, design changes require fabrication of new parts, and parts are not interchangeable

Simones 8 Step Method to Life Cycle Engineering

1. needs analysis

2. feasibility study

3. preliminary design

4. detailed design

5. production

6. distribution

7. consumption

8. retirement

Detailed Design

Models and Prototypes, Rapid Prototyping, Production Prototypes, and Testing

Taguchi Method (Robust Design)

A statistical method of evaluating tolerances verse cost (SIx Sigma)

Steps in Robust Parameter Design

1. Problem Formulation

2. Data Collection/Simulation

3. Factor Effect Analysis

4. Prediction/Confirmation

What does the ABET definition of engineering design state must satisfy

desired needs

The Need Statement

Describes a current situation that is unsatisfactory, should be written in a negative tone, establishes improvement in current situation as the ultimate purpose of the project, should contain a single need, rather than a set of goals

Distinguishing between a need and a goal

The negative emphasis and focus on the present situation of the need contrasts with the positive, future orientation of a goal