Stakeholders & Requirements
What is a stakeholder?
What is conceptual design?
The QFD tool linking customer needs to engineering requirements
This is the primary purpose of gears in mechanical systems
What is transmitting motion and power?
This equation determines the degrees of freedom of a planar mechanism based on links and joints.
What is Gruebler's equation?
Written in the language of the customer & describes what the product must accomplish.
What are stakeholder/customer needs?
The rule of brainstorming that prohibits criticism and prioritizes quantity over quality.
What is "deferring judgement"
In the House of Quality, this section lists measurable technical specifications that engineers can control
What are engineering requirements?
This term describes the ratio of teeth (or diameters) between meshing gear and determines speed/torque changes
What is gear ratio?
In a planar mechanism, this is the number of independent inputs required to completely define motion.
What is degrees of freedom?
Type of customer need that relates how well a product performs and includes measurable targets like speed, strength, and duration.
What is a performance need?
This tool lists product functions in rows and multiple solution options in columns to systematically create concepts
What is a morphological chart?
The part inside the House of Quality showing the strength of relationships between customer needs and engineering requirements.
What is the relationship matrix?
If a gear train has a ratio greater than 6:1 (reduction), the output speed does this while torque does this.
What is output speed decreases and torque increases?
This condition determines whether at least one link in a 4-bar mechanism can fully rotate.
What is the Grashof condition?
This characteristic of a good engineering requirement ensures it can be verified through testing or measurement.
What is measurability?
This concept screening method compares alternatives to baseline using +, -, and 0 scores
What is a Pugh Chart?
The triangular section at the top of the House of Quality identifies + or - correlations between engineering requirements.
What is the correlation roof?
This gear parameter defines tooth size and must match for gears to mesh properly.
What is pitch? (diametral or module)
In a crank-rocker 4-bar mechanism, this link rotates continuously while this link oscillates.
What are the crank and the rocker?
A good engineering requirement avoids having a specific solution, so the alternative design concepts aren't eliminated prematurely. This is known as being _ _?
Solution-Neutral
This evaluation method assigns weights to criteria and multiplies them by concept scores to rank alternatives with #'s
What is the weighted objectives method?
These two sections of the House of Quality help prioritize design by rating customer importance and competitors.
What are the importance ratings and competitive benchmarking?
In a 2-stage compound gear train, the overall ratio equals the product of individual stage ratios because gears on the same shaft share this property.
What is angular velocity?
These positions occur when the coupler and crank become collinear, creating high mechanical advantage and possible locking behavior.
What are toggle positions?