Mechanical Engineering Design. Group # 2 September 7, 2005 Weston Dooley General Design, Design Elements Robert Todd Miner Functional Design, Material Design, Visual Design Zachariah Ratzlaff Industrial Design, Design Process, Benchmarking Moises Narvaez Engineered Products.
Group # 2
September 7, 2005
General Design, Design Elements
Robert Todd Miner
Functional Design, Material Design, Visual Design
Industrial Design, Design Process, Benchmarking
Aristotle’s 4 Causes That Give Rise To Existence.
Punch Type Can Opener Example
There are four basic elements of design:
An expression of continuity between 2 points
Unity and Variety
Balance & Proportion
Important to keep in mind when considering functionality
These questions must be considered when designing a product.
Iron: A ferrous metal that is soft and ductile and has good corrosive resistance so it is used in pipes, fire hydrants etc.
Steel: Carbon and other elements are added to iron in order to make steel. Steel is strong durable malleable ductile corrosion resistant. Steel is extremely versatile and is used in many applications the most important being structural I beams.
Alloys: There are many alloys out there with there own intrinsic properties they are usually stronger, lighter, ductile and are very commonly used.
Five Guidelines to Visual Requirements
Visual requirements are the hardest to control since everyone has a different interpretation of what is visually pleasing.
The PDS is the guide for the design team
and should contain all important information.
Things to consider
In the act of designing, primary considerations must be given to the users needs. The needs to be satisfied provide the guidelines and constraints for the design. *Functional requirements: A product must satisfy the need or purpose for which it was created. *Material Requirements: The project or product should use the substance of which it is made in a simple and practical manner. The structure should be as strong as necessary, without any waste of materials.
To accomplish this, the designer must consider the following Design Factors: 1 Strength 12 Processing 2 Reliability 13 Control 3 Thermal considerations 14 Maintenance 4 Corrosion 15 Size 5 Wear 16 Noise 6 Friction 17 Styling 7 Flexibility 18 Utility 8 Stiffness 19 Surface finish 9 Cost 20 Lubrication 10 Safety 21 Shape 11 Weight 22 Volume
Failure to consider the above mentioned Designing Factors can lead to a failure of the project or product. In some cases this can lead to great economic loss and/or the loss of lives. On November 7, 1940, the first Tacoma Narrows suspension bridge collapsed due to wind-induced vibrations. Situated on the Tacoma Narrows in Puget Sound, near the city of Tacoma, Washington, the bridge had only been open for traffic a few months.
Every single component of this highly efficient and reliable natural gas turbine (designed to convert pressure differential in gas distribution stations to electrical energy) was carefully planned to withstand the extreme temperatures, shears, stresses, etc. that are found in gas turbines.