Midterm 2

Question 1

Identify the major 472 project deliverables and on the provided timeline indicate approximately where they occur during the semester

Answer 1

Interium report 1: first week of october
Prototype 1: last week of october
Interium report 2: Mid-november
Design Day: 1st week of december
Final Report: 2nd week of december

Question 2

From the marketing and problem definition stages of the PDP, designers should have a list of CRs from which ECs are defined. What differentiates ECs from Crs and why do we go through the trouble of identifying/defining ECs?

Answer 2

CRs are qualatative while ECs are quantative
CRs are generally worded and can be complex
CRs are statements of what customers want
ECs are specific and measurable
ECs are easier to design from, but meeting CRs is the goal

Question 3

Give one example of a decision or choioce a design team would make during the Product Archtecture stage of Embodiment Design

Answer 3

Modular vs Integral Design

Question 4

Give two examples of a decision of choice a design team would make during the “Configuration Design” stage of Embodiment Design

Answer 4

General shapes/sizes/features
Types of connection/fastening
General layout of components

Question 5

Give one example of a decision or choice a design team would make during the “Parametric Design” stage of Embodiment Design

Answer 5

Specific dimensions

Specific Tolerances

Question 6

Given the PDP presented in class, describe steps necessary in order to progress from here to the beginning of the concept development stage.

Answer 6

Next step, utilize a HOQ. CRs are generated then the ECs with quantify the CRs. I collection matrix is the determined. This establishes postive/neutral/negative correlation when an EC changes. The 4th room is where the relationship between the EC/CR and matrix is generated. Room 5 is where the weight of CRs is generated. Room 6 weighs other similar products. Room 7 is the technical assessment. Room 8 is the target, decision critiera and identify constraints is determined.

Question 7

Besides just ‘brainstorming” identify at leat one specifc method that a design team could utilize for concept generation

Answer 7

Another method is group discussion. The team of 5 can each generate 5 concepts. Concepts can then be further discussed as a group where indiviudals can add on potential benefits or remove downfalls of the design concept

Question 8

What is the ending output/deliverable of the House of Quality and how does that tie in to the design process moving forward?

Answer 8

HOQ is a list of ranked/scaled ECs that represent the important CRs. This produces high ranking ECs that are good candidates for design criterion during concept selection. These high ranking ECs can also be used as constraints

Question 9

In room 4 of the HOQ (the relationship matrix) what would an empty row signify? What could you do if you went through the analysis and had this occur?

Answer 9

An empty row signifies that there is not a relationship from a CR to an EC. (CR is not represented by EC). therefore EC needs to be generated to adequately describe the CR.

Question 10

We know that CR/EC.HOQ representations may not be unique, and suppose that both formulations appropriately represent the design problem. Without any additional specific information which formulation would be preferable and why?

Answer 10

B perferable bc the other has too many relationships which B has adequate amount of relationships to directly translate CRs to ECs more effectively

Question 11

A design team undergoing material selection has found another similar application in which a certain material was used successfully. Describe why the design team should fully explore why that material was chosen previously instead of simply re-selecting that material for their application

Answer 11

Design is about understanding/justifying choices
Original choice may not have been optimal
Application may differ slightly
Manufacturing capabilities differ

Question 12

Briefly describe the steps of a material selection process. Where applicable, include example of the type of analysis/decisions that might be made during the steps.

Answer 12

Formally define required material properties (ex: strength)
Determine go/no-go criteria to climate broad range of material classes.
Investigate narrowed material choices in detail. This includes Ashely charts CES software
If it is a critical component, manufacturing prelim runs could be required for testing and analysis

Question 13

Name 4 factors that a design team may need to consider when selecting a manufacturing process to make a part?

Answer 13

Number of parts produced
The material used
The desired quality of product (tolerances)
The cost/availability of machines/production

Question 14

Give 2 examples of types of geometric tolerances that you might need to specify on an engineering drawing

Answer 14

Flatness

Circularility

Question 15

Name at least 2 cost categories that make up the manufacturing cost of a part. Briefly describe what each of these entail including identifying at least 2 factors or parameters that can be used in modeling each cost category.

Answer 15

Material (Cost of raw material&raquo_space; supply vs demand ) (cost of waste or unused portions of raw materials)
Overhead (cost of renting or using space to operate&raquo_space; retail properties)(Cost of running/electricity, heating, etc.)

Question 16

You are tasked to design a fully enclosed box with maximum possible volume.
>Design Parameters
>Optimization Function
>Applicable constraint equations or parameters written using the standard format

Answer 16

> x = [L,W,D]
> f(x) = -LWD
>  0 = C_1 = 2LW+2LD+2WD-2.5
 0 = C_2 = D - W/2
C_eq = 3L- 2W

L/W = 2/3 (this comes from the ratio)
D < W/2