Elements of a good engineering requirement
The requirement does not contain any false information.
What is correct?
This type of software helps engineers design and visualize products before they are produced.
What is CAD (computer-aided design)?
"Straight cut" gears, the most common type.
What are spur gears?
Detailed design can be broken up into four of these.
What are phases?
The product needs this type of requirement so that it will function as needed.
What is necessary?
This visual design tool breaks down concept selection by showing a variety of solutions for each function of a larger product.
What is a morphological chart/matrix?
These gears can handle more load than spur gears. You must consider "handedness" when spec-ing these.
What are helical gears?
The first phase which deals with defining a range of conditions or parameters the system must operate within.
What are constraints?
A requirement with this quality is clearly understood. There is no confusion in its interpretation.
What is unambiguous?
This graphical structure helps engineers evaluate how different customer needs and requirements interact with each other.
What is house of quality?
For two gears to mesh, this measurement must match.
What is the module?
The second phase, this deals with how assemblies and components are arranged.
What is configuration and architecture?
Requirements with this quality are reasonable within the scope of the problem.
What is feasible?
To use this tool, designers must assign value to different needs/requirements and rate each concept on these categories. You might need a calculator or Excel.
What is a weighted objective chart?
# driven gear teeth divided by # of driving gear teeth.
What is a gear ratio?
The third phase, this C examines how components fit together and transfer energy, signals, etc.
What are connections and interfaces?
If an engineering requirement has this element, it allows for multiple solutions to a particular problem.
What is open?
This decision making tool helps evaluate how one concept stacks up against alternatives. Count your +'s and -'s.
What is a Pugh Chart/Matrix?
This geometric element is the intersection of circumferences of two messing gears.
What is a common tangent/tangent line/tangent plane?
The fourth and final phase, this determines which parts will perform what functions and whether they will be made or bought.
What is defining components?