useful in design of machine elemnets

1. Design Procedure
Subject: DME
Semester: 5th
Division: FX
Branch: Mechanical
Prepared By (Roll no.):
1. Akash Ambaliya (03)
2. Randhir Chavda (23)
3. Nirav Hadiya (43)
Atmiya Institute of Technology &
Science
Gujarat Technological University

2. What is design procedure
 Design process is a collection of procedures and habits that help teams design
better products.
 Designing is the process of making many decisions that converts a need into a
hardware reality.
Need Product

3. 7-Step Design Process
1. Product Design Specifications (PDS)
2. External Search (Research)
3. Internal Search (Brainstorming)
4. Concept Evaluation and Selection
5. Detail Design (Engineering)
6. Prototyping and Testing
7. Documentation

4. Design Process Outcomes
Step Outcome
Product Design Specifications PDS Document
External Search (Research) List of existing related products and
technologies
Internal Search (Brainstorming) A lot of solution ideas
Concept Evaluation / Selection Pros and Cons / Decision Matrix
Selection of one idea to implement
Detail Design (Engineering) Determination of all details needed
to build the product
Prototyping and Testing Comparisons to PDS target
Improvement recommendations
Documentation Final Design Report
BOM + Production Drawings
All other reports

5. Detail Design (Engineering)
Lift and Drag Coefficients
(as effected by ground promimity)
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0 0.05 0.1 0.15
h/L
Coefficient
Drag Coefficient
Lift Coefficient
More Abstract Engineering Less Abstract

6. Design Process
 Applies to Top-level decisions
 Applies to lower levels decisions
 Define requirements
 Search for existing ideas/technologies
 Brainstorm for solutions
 Pick a candidate
 Determine the details

7. Product Development Process
Concept Synthesis
PDS
Concept Evaluation
Candidate Design
Detail Design
Candidate Design
Release for Production
Prototyping

8. Detail Design
Parameter Design
Candidate Design
Release for Production
System-Level Design
Prototype Testing
Components
No Numbers
Numbers

9. Complexities of Developing a PDS
Document
 Level-I:
 Goal is clear, “Design a X to do Y”
 specifications are known,
 priorities are known,
 no mass production concerns,
 IP issues not important,
 limited customer base
 Example: one-of-a-kind equipment.

10. Complexities of Developing a PDS
Document
 Level-II:
 Goal is specific “Design a X to do Y”,
 Specifications are unknown,
 Priorities are unknown,
 Mass production concerns,
 IP issues are important,
 expanded customer base
 Example: Most consumer products

11. Complexities of Developing a PDS
Document
 Level-III:
 Goal is unclear, “Design ? To do ?
 There is a general statement of need
 Not easy to get to: “Design X to do Y”
 Example: Oceans are rising

12. Customers
 People who define the PDS
 People who influence product success
 People you cannot ignore
Team
Company
(Internal)
Globe
(External)

13. Methods of setting targets
Some targets are specified by:
 Marketing
 Management
 Regulations /standards
 Users / buyers / retailers

14. Methods of setting targets
 Benchmarking + parametric Studies
 Technology capability
 Field experts
 Experimentation
 Educated guesses
 Select ranges for targets from Barely acceptable to highly desirable

15. ThankYou…