Design Process Overview - Ahmed Kovacevic

Presentation for product design.

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14. A functional model is a graphical representation of the functions a product performs on its inputs and outputs

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27. i Problem Definition . Clarify objectives
[ Client Statement
eed y constrain . Establish user requirements

Identify constraints
Establish functions

Establish design specification
The Performance Specification method
The QFD Method (Design Matrix)

” | . Generate alternatives
| 9. refine and optimize design | Detailed Design The Morphological Chart method

Model and Analyse design

Design Design Mechanical Design methods
n Specs Communication a
tation), 10, document design . Test end evaluate design

The Weighted Objectives method

Clearly understand the problem which has to be solved
Make sure not to overlook any of important aspects
Set the stage for UNBIASED solutions and Enhance team creativity

30. _ _ RES

31. El — er

32. Support for Step 1: Standard categories for searching for specifications

Geometry Dimensions, space requirements, ...

Kinematics Type and direction of motion, velocity,

Forces Direction and magnitude, frequency, load imposed by, energy type,
efficiency, capacity, conversion,

Material Properties of final product, flow of materials, design for manufacture, ...

Signals Input and output, display

Safety Protection issues
Ergonomics Comfort issues, human interface issues
Production Factory limitations, tolerances, wastage
Quality control Possibilities for testing

Assembly Set by DFMA or special regulations or needs

Transport Packaging needs
Operation Environmental issues such as noise
Maintenance Servicing intervals, repair

Costs Manufacturing costs, materials costs

Schedules Time constraints.

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35. Performance Specifications
12-Feb | Grasping surface can be held by the 95 Review of concept variants (estimated
percentile 4 year old size of grasping surface) during concept
selection
13-Feb |Average diameter of grasping surface < Tin. | KLW | Verify with engr. drawings during
reliminary design phase

during proof of concept

12-Feb |> 80% of stored energy is transferred to disc | REF [Measure available energy during proof
for launch f conc
KAG

14-Feb [Product stores > 80% of user input energy Measure energy storage potential

12-Feb |Excess energy is dissipated by product view of concept variants during
concept selection
13-Feb |Force to press trigger < 0.5 Ib. KLW |Measure triggering force of alpha

rotot)

12-Feb [Force to "cock" launcher < 5 Ib. Review of concept variants during
concept selection
12-Feb [Weight <2 Ib. Weigh alpha prototype

36. Performance Specifications

12-Feb |Grasping surface can be held by the 95 Eee | of concept variants (estimated
percentile 4 year old size of grasping surface) during concept
selection

verage diameter of grasping surface < Verify with engr. drawings during

5 in. (Due to new ergonomic data) preliminary design phase
Es Feb |Product stores > 80% of user input energy Measure energy storage potential

> 80% of stored energy is transferred to disc Measure available energy during proof
for launch of concept

37. Establish Design Matrix

The Quality Function
Deployment Method
or
Design Matrix
or

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41. Draw a matrix of product attributes against engineering characteristics,
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5. Identify the relationship between engineering characteristics and
product attributes,
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6. Identify relevant interactions between engineering characteristics,

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7. Set target figures to be achieved for the engineering characteristics.
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47. Vertical Thinking Lateral Thinking
Goal: Selecting an idea Goal: Generating ideas

focuses on “right or wrong”

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Attract mouse

49. © Used to generate possible design solutions

» After the problem and the function of the device is understood,
brainstorming can be used to generate potential solutions

© Very useful visual way of organizing and assessing the range
of possible solution combinations for a problem

Very simple - it is a table

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52. Select a single concept to tabricale
Reese Raion

54. Shared

value list
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56. Weight

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Bearings
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Squeeze packing

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Labour

Tools and equipment

Indirect cost

Marketing

2 Performance

4

Sealing
Smoothness
Alignment
Growth formation

Strength

The overall utility

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score of quality of each 3
ity (weighted score) of

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