The lesson outcomes are to identify the importance of communication, recognize the steps in detailed design analysis, identify prototype types, explain prototypes' importance, and recognize prototyping methods.

1. COMMUNICATION &
DETAILED DESIGN ANALYSIS
Design Philosophy
Dr. (Ms.) Jayaruwani Fernando, Ph.D. (Ag. & Biosystems Engineering), M.S. (Industrial
& Ag. Technology), M.Phil. (Ag. & Biosystems Engineering), B.Sc. (Agriculture)

2. LESSON OUTCOMES
• Identify the importance of communication of the design
• Recognize the steps in detailed design analysis
• Identify types of prototypes
• Explain the importance of prototypes
• Recognize prototyping methods
Dr. (Ms.) Jayaruwani Fernando, Ph.D. (Ag. & Biosystems Engineering), M.S. (Industrial and Ag. Technology), M.Phil. (Ag. & Biosystems Engineering), B.Sc. (Agriculture)

3. COMMUNICATION OF THE DESIGN
• The purpose of the design is to satisfy the needs of the client.
• Designer must provide oral presentations and written design reports.
• Continuous communication is important in order to avoid surprises.
• Many great designs and inventions have been lost simply because the originator
was unable or unwilling to explain his/her accomplishments to others.
Recognize the need
Problem definition
Gathering of information
Concept generation
Concept selection
Communication
Dr. (Ms.) Jayaruwani Fernando, Ph.D. (Ag. & Biosystems Engineering), M.S. (Industrial and Ag. Technology), M.Phil. (Ag. & Biosystems Engineering), B.Sc. (Agriculture)

4. • There are only three forms of communication available to us: written, oral, and
graphical.
• The successful engineer will be technically competent and versatile in all three.
Competency only comes from practice.
• Ability in writing can be acquired by writing letters, reports, memos, and papers.
It doesn’t matter whether the articles are published or reviewed—the practice is
the important thing.
COMMUNICATION OF THE DESIGN
Dr. (Ms.) Jayaruwani Fernando, Ph.D. (Ag. & Biosystems Engineering), M.S. (Industrial and Ag. Technology), M.Phil. (Ag. & Biosystems Engineering), B.Sc. (Agriculture)

5. • Ability in speaking can be obtained in educational, public, and professional
activities.
• To acquire drawing ability, pencil sketching should be applied to illustrate
every possible idea. CAD work should complement this, not replace it.
• Sketches, drawings, visual aids, computer graphics, and models are important
in the communication process.
Dr. (Ms.) Jayaruwani Fernando, Ph.D. (Ag. & Biosystems Engineering), M.S. (Industrial and Ag. Technology), M.Phil. (Ag. & Biosystems Engineering), B.Sc. (Agriculture)

6. 6 Steps in detailed design analysis:
1. Check design safety – calculate all important parameters
Eg: Stress, Strain, uncertainty, design factor, factor of safety
2. Select materials – make a list of materials that satisfy stress and other design
requirements and select the best using decision matrix
Recognize the need
Problem definition
Gathering of information
Concept generation
Concept selection
Communication
Detailed design and analysis
DETAILED DESIGN AND ANALYSIS
Dr. (Ms.) Jayaruwani Fernando, Ph.D. (Ag. & Biosystems Engineering), M.S. (Industrial and Ag. Technology), M.Phil. (Ag. & Biosystems Engineering), B.Sc. (Agriculture)

7. STEPS IN DETAILED DESIGN ANALYSIS:
3. Modelling – 3D CAD model, manufacturing drawings, and mathematical modelling
• Accurately simulate the real physical world
• All real physical systems are complex
• Creating a mathematical model of the system means we are simplifying the system to the point that it
can be analyzed
• Assumptions are made in creating a meaningful model
4. Check the manufacturability with available manufacturing methods
» Use rapid prototyping
» CNC machining
5. Cost analysis for a prototype and production unit
6. Aesthetics
Dr. (Ms.) Jayaruwani Fernando, Ph.D. (Ag. & Biosystems Engineering), M.S. (Industrial and Ag. Technology), M.Phil. (Ag. & Biosystems Engineering), B.Sc. (Agriculture)

8. Algorithm for calculating design parameters of batch type heat pump dryer